/**********************************************************************
 * 
 * StackWalker.cpp
 *
 *
 * History:
 * 2005年07月27日 v1 - First public release on http://www.codeproject.com/
 * http://www.codeproject.com/threads/StackWalker.asp
 * 2005年07月28日 v2 - Changed the params of the constructor and ShowCallstack
 * (to simplify the usage)
 * 2005年08月01日 v3 - Changed to use 'CONTEXT_FULL' instead of CONTEXT_ALL 
 * (should also be enough)
 * - Changed to compile correctly with the PSDK of VC7.0
 * (GetFileVersionInfoSizeA and GetFileVersionInfoA is wrongly defined:
 * it uses LPSTR instead of LPCSTR as first paremeter)
 * - Added declarations to support VC5/6 without using 'dbghelp.h'
 * - Added a 'pUserData' member to the ShowCallstack function and the 
 * PReadProcessMemoryRoutine declaration (to pass some user-defined data, 
 * which can be used in the readMemoryFunction-callback)
 * 2005年08月02日 v4 - OnSymInit now also outputs the OS-Version by default
 * - Added example for doing an exception-callstack-walking in main.cpp
 * (thanks to owillebo: http://www.codeproject.com/script/profile/whos_who.asp?id=536268)
 * 2005年08月05日 v5 - Removed most Lint (http://www.gimpel.com/) errors... thanks to Okko Willeboordse!
 *
 **********************************************************************/
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#pragma comment(lib, "version.lib") // for "VerQueryValue"

#include "StackWalker.h"


// If VC7 and later, then use the shipped 'dbghelp.h'-file
#if _MSC_VER >= 1300
#include <dbghelp.h>
#else
// inline the important dbghelp.h-declarations...
typedef enum {
 SymNone = 0,
 SymCoff,
 SymCv,
 SymPdb,
 SymExport,
 SymDeferred,
 SymSym,
 SymDia,
 SymVirtual,
 NumSymTypes
} SYM_TYPE;
typedef struct _IMAGEHLP_LINE64 {
 DWORD SizeOfStruct; // set to sizeof(IMAGEHLP_LINE64)
 PVOID Key; // internal
 DWORD LineNumber; // line number in file
 PCHAR FileName; // full filename
 DWORD64 Address; // first instruction of line
} IMAGEHLP_LINE64, *PIMAGEHLP_LINE64;
typedef struct _IMAGEHLP_MODULE64 {
 DWORD SizeOfStruct; // set to sizeof(IMAGEHLP_MODULE64)
 DWORD64 BaseOfImage; // base load address of module
 DWORD ImageSize; // virtual size of the loaded module
 DWORD TimeDateStamp; // date/time stamp from pe header
 DWORD CheckSum; // checksum from the pe header
 DWORD NumSyms; // number of symbols in the symbol table
 SYM_TYPE SymType; // type of symbols loaded
 CHAR ModuleName[32]; // module name
 CHAR ImageName[256]; // image name
 CHAR LoadedImageName[256]; // symbol file name
} IMAGEHLP_MODULE64, *PIMAGEHLP_MODULE64;
typedef struct _IMAGEHLP_SYMBOL64 {
 DWORD SizeOfStruct; // set to sizeof(IMAGEHLP_SYMBOL64)
 DWORD64 Address; // virtual address including dll base address
 DWORD Size; // estimated size of symbol, can be zero
 DWORD Flags; // info about the symbols, see the SYMF defines
 DWORD MaxNameLength; // maximum size of symbol name in 'Name'
 CHAR Name[1]; // symbol name (null terminated string)
} IMAGEHLP_SYMBOL64, *PIMAGEHLP_SYMBOL64;
typedef enum {
 AddrMode1616,
 AddrMode1632,
 AddrModeReal,
 AddrModeFlat
} ADDRESS_MODE;
typedef struct _tagADDRESS64 {
 DWORD64 Offset;
 WORD Segment;
 ADDRESS_MODE Mode;
} ADDRESS64, *LPADDRESS64;
typedef struct _KDHELP64 {
 DWORD64 Thread;
 DWORD ThCallbackStack;
 DWORD ThCallbackBStore;
 DWORD NextCallback;
 DWORD FramePointer;
 DWORD64 KiCallUserMode;
 DWORD64 KeUserCallbackDispatcher;
 DWORD64 SystemRangeStart;
 DWORD64 Reserved[8];
} KDHELP64, *PKDHELP64;
typedef struct _tagSTACKFRAME64 {
 ADDRESS64 AddrPC; // program counter
 ADDRESS64 AddrReturn; // return address
 ADDRESS64 AddrFrame; // frame pointer
 ADDRESS64 AddrStack; // stack pointer
 ADDRESS64 AddrBStore; // backing store pointer
 PVOID FuncTableEntry; // pointer to pdata/fpo or NULL
 DWORD64 Params[4]; // possible arguments to the function
 BOOL Far; // WOW far call
 BOOL Virtual; // is this a virtual frame?
 DWORD64 Reserved[3];
 KDHELP64 KdHelp;
} STACKFRAME64, *LPSTACKFRAME64;
typedef
BOOL
(__stdcall *PREAD_PROCESS_MEMORY_ROUTINE64)(
 HANDLE hProcess,
 DWORD64 qwBaseAddress,
 PVOID lpBuffer,
 DWORD nSize,
 LPDWORD lpNumberOfBytesRead
 );
typedef
PVOID
(__stdcall *PFUNCTION_TABLE_ACCESS_ROUTINE64)(
 HANDLE hProcess,
 DWORD64 AddrBase
 );
typedef
DWORD64
(__stdcall *PGET_MODULE_BASE_ROUTINE64)(
 HANDLE hProcess,
 DWORD64 Address
 );
typedef
DWORD64
(__stdcall *PTRANSLATE_ADDRESS_ROUTINE64)(
 HANDLE hProcess,
 HANDLE hThread,
 LPADDRESS64 lpaddr
 );
#define SYMOPT_CASE_INSENSITIVE 0x00000001
#define SYMOPT_UNDNAME 0x00000002
#define SYMOPT_DEFERRED_LOADS 0x00000004
#define SYMOPT_NO_CPP 0x00000008
#define SYMOPT_LOAD_LINES 0x00000010
#define SYMOPT_OMAP_FIND_NEAREST 0x00000020
#define SYMOPT_LOAD_ANYTHING 0x00000040
#define SYMOPT_IGNORE_CVREC 0x00000080
#define SYMOPT_NO_UNQUALIFIED_LOADS 0x00000100
#define SYMOPT_FAIL_CRITICAL_ERRORS 0x00000200
#define SYMOPT_EXACT_SYMBOLS 0x00000400
#define SYMOPT_ALLOW_ABSOLUTE_SYMBOLS 0x00000800
#define SYMOPT_IGNORE_NT_SYMPATH 0x00001000
#define SYMOPT_INCLUDE_32BIT_MODULES 0x00002000
#define SYMOPT_PUBLICS_ONLY 0x00004000
#define SYMOPT_NO_PUBLICS 0x00008000
#define SYMOPT_AUTO_PUBLICS 0x00010000
#define SYMOPT_NO_IMAGE_SEARCH 0x00020000
#define SYMOPT_SECURE 0x00040000
#define SYMOPT_DEBUG 0x80000000
#define UNDNAME_COMPLETE (0x0000) // Enable full undecoration
#define UNDNAME_NAME_ONLY (0x1000) // Crack only the name for primary declaration;
#endif // _MSC_VER < 1300

// Some missing defines (for VC5/6):
#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
#endif 


// secure-CRT_functions are only available starting with VC8
#if _MSC_VER < 1400
#define strcpy_s strcpy
#define strcat_s(dst, len, src) strcat(dst, src)
#define _snprintf_s _snprintf
#define _tcscat_s _tcscat
#endif

// Normally it should be enough to use 'CONTEXT_FULL' (better would be 'CONTEXT_ALL')
#define USED_CONTEXT_FLAGS CONTEXT_FULL


class StackWalkerInternal
{
public:
 StackWalkerInternal(StackWalker *parent, HANDLE hProcess)
 {
 m_parent = parent;
 m_hDbhHelp = NULL;
 pSC = NULL;
 m_hProcess = hProcess;
 m_szSymPath = NULL;
 pSFTA = NULL;
 pSGLFA = NULL;
 pSGMB = NULL;
 pSGMI = NULL;
 pSGO = NULL;
 pSGSFA = NULL;
 pSI = NULL;
 pSLM = NULL;
 pSSO = NULL;
 pSW = NULL;
 pUDSN = NULL;
 pSGSP = NULL;
 }
 ~StackWalkerInternal()
 {
 if (pSC != NULL)
 pSC(m_hProcess); // SymCleanup
 if (m_hDbhHelp != NULL)
 FreeLibrary(m_hDbhHelp);
 m_hDbhHelp = NULL;
 m_parent = NULL;
 if(m_szSymPath != NULL)
 free(m_szSymPath);
 m_szSymPath = NULL;
 }
 BOOL Init(LPCSTR szSymPath)
 {
 if (m_parent == NULL)
 return FALSE;
 // Dynamically load the Entry-Points for dbghelp.dll:
 // First try to load the newsest one from
 TCHAR szTemp[4096];
 // But before wqe do this, we first check if the ".local" file exists
 if (GetModuleFileName(NULL, szTemp, 4096) > 0)
 {
 _tcscat_s(szTemp, _T(".local"));
 if (GetFileAttributes(szTemp) == INVALID_FILE_ATTRIBUTES)
 {
 // ".local" file does not exist, so we can try to load the dbghelp.dll from the "Debugging Tools for Windows"
 if (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0)
 {
 _tcscat_s(szTemp, _T("\\Debugging Tools for Windows\\dbghelp.dll"));
 // now check if the file exists:
 if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
 {
 m_hDbhHelp = LoadLibrary(szTemp);
 }
 }
 // Still not found? Then try to load the 64-Bit version:
 if ( (m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0) )
 {
 _tcscat_s(szTemp, _T("\\Debugging Tools for Windows 64-Bit\\dbghelp.dll"));
 if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
 {
 m_hDbhHelp = LoadLibrary(szTemp);
 }
 }
 }
 }
 if (m_hDbhHelp == NULL) // if not already loaded, try to load a default-one
 m_hDbhHelp = LoadLibrary( _T("dbghelp.dll") );
 if (m_hDbhHelp == NULL)
 return FALSE;
 pSI = (tSI) GetProcAddress(m_hDbhHelp, "SymInitialize" );
 pSC = (tSC) GetProcAddress(m_hDbhHelp, "SymCleanup" );

 pSW = (tSW) GetProcAddress(m_hDbhHelp, "StackWalk64" );
 pSGO = (tSGO) GetProcAddress(m_hDbhHelp, "SymGetOptions" );
 pSSO = (tSSO) GetProcAddress(m_hDbhHelp, "SymSetOptions" );

 pSFTA = (tSFTA) GetProcAddress(m_hDbhHelp, "SymFunctionTableAccess64" );
 pSGLFA = (tSGLFA) GetProcAddress(m_hDbhHelp, "SymGetLineFromAddr64" );
 pSGMB = (tSGMB) GetProcAddress(m_hDbhHelp, "SymGetModuleBase64" );
 pSGMI = (tSGMI) GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64" );
 //pSGMI_V3 = (tSGMI_V3) GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64" );
 pSGSFA = (tSGSFA) GetProcAddress(m_hDbhHelp, "SymGetSymFromAddr64" );
 pUDSN = (tUDSN) GetProcAddress(m_hDbhHelp, "UnDecorateSymbolName" );
 pSLM = (tSLM) GetProcAddress(m_hDbhHelp, "SymLoadModule64" );
 pSGSP =(tSGSP) GetProcAddress(m_hDbhHelp, "SymGetSearchPath" );

 if ( pSC == NULL || pSFTA == NULL || pSGMB == NULL || pSGMI == NULL ||
 pSGO == NULL || pSGSFA == NULL || pSI == NULL || pSSO == NULL ||
 pSW == NULL || pUDSN == NULL || pSLM == NULL )
 {
 FreeLibrary(m_hDbhHelp);
 m_hDbhHelp = NULL;
 pSC = NULL;
 return FALSE;
 }

 // SymInitialize
 if (szSymPath != NULL)
 m_szSymPath = _strdup(szSymPath);
 if (this->pSI(m_hProcess, m_szSymPath, FALSE) == FALSE)
 this->m_parent->OnDbgHelpErr("SymInitialize", GetLastError(), 0);
 
 DWORD symOptions = this->pSGO(); // SymGetOptions
 symOptions |= SYMOPT_LOAD_LINES;
 symOptions |= SYMOPT_FAIL_CRITICAL_ERRORS;
 //symOptions |= SYMOPT_NO_PROMPTS;
 // SymSetOptions
 symOptions = this->pSSO(symOptions);

 char buf[StackWalker::STACKWALK_MAX_NAMELEN] = {0};
 if (this->pSGSP != NULL)
 {
 if (this->pSGSP(m_hProcess, buf, StackWalker::STACKWALK_MAX_NAMELEN) == FALSE)
 this->m_parent->OnDbgHelpErr("SymGetSearchPath", GetLastError(), 0);
 }
 char szUserName[1024] = {0};
 DWORD dwSize = 1024;
 GetUserNameA(szUserName, &dwSize);
 this->m_parent->OnSymInit(buf, symOptions, szUserName);

 return TRUE;
 }

 StackWalker *m_parent;

 HMODULE m_hDbhHelp;
 HANDLE m_hProcess;
 LPSTR m_szSymPath;

/*typedef struct IMAGEHLP_MODULE64_V3 {
 DWORD SizeOfStruct; // set to sizeof(IMAGEHLP_MODULE64)
 DWORD64 BaseOfImage; // base load address of module
 DWORD ImageSize; // virtual size of the loaded module
 DWORD TimeDateStamp; // date/time stamp from pe header
 DWORD CheckSum; // checksum from the pe header
 DWORD NumSyms; // number of symbols in the symbol table
 SYM_TYPE SymType; // type of symbols loaded
 CHAR ModuleName[32]; // module name
 CHAR ImageName[256]; // image name
 // new elements: 07-Jun-2002
 CHAR LoadedImageName[256]; // symbol file name
 CHAR LoadedPdbName[256]; // pdb file name
 DWORD CVSig; // Signature of the CV record in the debug directories
 CHAR CVData[MAX_PATH * 3]; // Contents of the CV record
 DWORD PdbSig; // Signature of PDB
 GUID PdbSig70; // Signature of PDB (VC 7 and up)
 DWORD PdbAge; // DBI age of pdb
 BOOL PdbUnmatched; // loaded an unmatched pdb
 BOOL DbgUnmatched; // loaded an unmatched dbg
 BOOL LineNumbers; // we have line number information
 BOOL GlobalSymbols; // we have internal symbol information
 BOOL TypeInfo; // we have type information
 // new elements: 17-Dec-2003
 BOOL SourceIndexed; // pdb supports source server
 BOOL Publics; // contains public symbols
};
*/
typedef struct IMAGEHLP_MODULE64_V2 {
 DWORD SizeOfStruct; // set to sizeof(IMAGEHLP_MODULE64)
 DWORD64 BaseOfImage; // base load address of module
 DWORD ImageSize; // virtual size of the loaded module
 DWORD TimeDateStamp; // date/time stamp from pe header
 DWORD CheckSum; // checksum from the pe header
 DWORD NumSyms; // number of symbols in the symbol table
 SYM_TYPE SymType; // type of symbols loaded
 CHAR ModuleName[32]; // module name
 CHAR ImageName[256]; // image name
 CHAR LoadedImageName[256]; // symbol file name
};


 // SymCleanup()
 typedef BOOL (__stdcall *tSC)( IN HANDLE hProcess );
 tSC pSC;

 // SymFunctionTableAccess64()
 typedef PVOID (__stdcall *tSFTA)( HANDLE hProcess, DWORD64 AddrBase );
 tSFTA pSFTA;

 // SymGetLineFromAddr64()
 typedef BOOL (__stdcall *tSGLFA)( IN HANDLE hProcess, IN DWORD64 dwAddr,
 OUT PDWORD pdwDisplacement, OUT PIMAGEHLP_LINE64 Line );
 tSGLFA pSGLFA;

 // SymGetModuleBase64()
 typedef DWORD64 (__stdcall *tSGMB)( IN HANDLE hProcess, IN DWORD64 dwAddr );
 tSGMB pSGMB;

 // SymGetModuleInfo64()
 typedef BOOL (__stdcall *tSGMI)( IN HANDLE hProcess, IN DWORD64 dwAddr, OUT IMAGEHLP_MODULE64_V2 *ModuleInfo );
 tSGMI pSGMI;

// // SymGetModuleInfo64()
// typedef BOOL (__stdcall *tSGMI_V3)( IN HANDLE hProcess, IN DWORD64 dwAddr, OUT IMAGEHLP_MODULE64_V3 *ModuleInfo );
// tSGMI_V3 pSGMI_V3;

 // SymGetOptions()
 typedef DWORD (__stdcall *tSGO)( VOID );
 tSGO pSGO;

 // SymGetSymFromAddr64()
 typedef BOOL (__stdcall *tSGSFA)( IN HANDLE hProcess, IN DWORD64 dwAddr,
 OUT PDWORD64 pdwDisplacement, OUT PIMAGEHLP_SYMBOL64 Symbol );
 tSGSFA pSGSFA;

 // SymInitialize()
 typedef BOOL (__stdcall *tSI)( IN HANDLE hProcess, IN PSTR UserSearchPath, IN BOOL fInvadeProcess );
 tSI pSI;

 // SymLoadModule64()
 typedef DWORD64 (__stdcall *tSLM)( IN HANDLE hProcess, IN HANDLE hFile,
 IN PSTR ImageName, IN PSTR ModuleName, IN DWORD64 BaseOfDll, IN DWORD SizeOfDll );
 tSLM pSLM;

 // SymSetOptions()
 typedef DWORD (__stdcall *tSSO)( IN DWORD SymOptions );
 tSSO pSSO;

 // StackWalk64()
 typedef BOOL (__stdcall *tSW)( 
 DWORD MachineType, 
 HANDLE hProcess,
 HANDLE hThread, 
 LPSTACKFRAME64 StackFrame, 
 PVOID ContextRecord,
 PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
 PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
 PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
 PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress );
 tSW pSW;

 // UnDecorateSymbolName()
 typedef DWORD (__stdcall WINAPI *tUDSN)( PCSTR DecoratedName, PSTR UnDecoratedName,
 DWORD UndecoratedLength, DWORD Flags );
 tUDSN pUDSN;

 typedef BOOL (__stdcall WINAPI *tSGSP)(HANDLE hProcess, PSTR SearchPath, DWORD SearchPathLength);
 tSGSP pSGSP;


private:
 // **************************************** ToolHelp32 ************************
 #define MAX_MODULE_NAME32 255
 #define TH32CS_SNAPMODULE 0x00000008
 #pragma pack( push, 8 )
 typedef struct tagMODULEENTRY32
 {
 DWORD dwSize;
 DWORD th32ModuleID; // This module
 DWORD th32ProcessID; // owning process
 DWORD GlblcntUsage; // Global usage count on the module
 DWORD ProccntUsage; // Module usage count in th32ProcessID's context
 BYTE * modBaseAddr; // Base address of module in th32ProcessID's context
 DWORD modBaseSize; // Size in bytes of module starting at modBaseAddr
 HMODULE hModule; // The hModule of this module in th32ProcessID's context
 char szModule[MAX_MODULE_NAME32 + 1];
 char szExePath[MAX_PATH];
 } MODULEENTRY32;
 typedef MODULEENTRY32 * PMODULEENTRY32;
 typedef MODULEENTRY32 * LPMODULEENTRY32;
 #pragma pack( pop )

 BOOL GetModuleListTH32(HANDLE hProcess, DWORD pid)
 {
 // CreateToolhelp32Snapshot()
 typedef HANDLE (__stdcall *tCT32S)(DWORD dwFlags, DWORD th32ProcessID);
 // Module32First()
 typedef BOOL (__stdcall *tM32F)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);
 // Module32Next()
 typedef BOOL (__stdcall *tM32N)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);

 // try both dlls...
 const TCHAR *dllname[] = { _T("kernel32.dll"), _T("tlhelp32.dll") };
 HINSTANCE hToolhelp = NULL;
 tCT32S pCT32S = NULL;
 tM32F pM32F = NULL;
 tM32N pM32N = NULL;

 HANDLE hSnap;
 MODULEENTRY32 me;
 me.dwSize = sizeof(me);
 BOOL keepGoing;
 size_t i;

 for (i = 0; i<(sizeof(dllname) / sizeof(dllname[0])); i++ )
 {
 hToolhelp = LoadLibrary( dllname[i] );
 if (hToolhelp == NULL)
 continue;
 pCT32S = (tCT32S) GetProcAddress(hToolhelp, "CreateToolhelp32Snapshot");
 pM32F = (tM32F) GetProcAddress(hToolhelp, "Module32First");
 pM32N = (tM32N) GetProcAddress(hToolhelp, "Module32Next");
 if ( (pCT32S != NULL) && (pM32F != NULL) && (pM32N != NULL) )
 break; // found the functions!
 FreeLibrary(hToolhelp);
 hToolhelp = NULL;
 }

 if (hToolhelp == NULL)
 return FALSE;

 hSnap = pCT32S( TH32CS_SNAPMODULE, pid );
 if (hSnap == (HANDLE) -1)
 return FALSE;

 keepGoing = !!pM32F( hSnap, &me );
 int cnt = 0;
 while (keepGoing)
 {
 this->LoadModule(hProcess, me.szExePath, me.szModule, (DWORD64) me.modBaseAddr, me.modBaseSize);
 cnt++;
 keepGoing = !!pM32N( hSnap, &me );
 }
 CloseHandle(hSnap);
 FreeLibrary(hToolhelp);
 if (cnt <= 0)
 return FALSE;
 return TRUE;
 } // GetModuleListTH32

 // **************************************** PSAPI ************************
 typedef struct _MODULEINFO {
 LPVOID lpBaseOfDll;
 DWORD SizeOfImage;
 LPVOID EntryPoint;
 } MODULEINFO, *LPMODULEINFO;

 BOOL GetModuleListPSAPI(HANDLE hProcess)
 {
 // EnumProcessModules()
 typedef BOOL (__stdcall *tEPM)(HANDLE hProcess, HMODULE *lphModule, DWORD cb, LPDWORD lpcbNeeded );
 // GetModuleFileNameEx()
 typedef DWORD (__stdcall *tGMFNE)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename, DWORD nSize );
 // GetModuleBaseName()
 typedef DWORD (__stdcall *tGMBN)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename, DWORD nSize );
 // GetModuleInformation()
 typedef BOOL (__stdcall *tGMI)(HANDLE hProcess, HMODULE hModule, LPMODULEINFO pmi, DWORD nSize );

 HINSTANCE hPsapi;
 tEPM pEPM;
 tGMFNE pGMFNE;
 tGMBN pGMBN;
 tGMI pGMI;

 DWORD i;
 //ModuleEntry e;
 DWORD cbNeeded;
 MODULEINFO mi;
 HMODULE *hMods = 0;
 char *tt = NULL;
 char *tt2 = NULL;
 const SIZE_T TTBUFLEN = 8096;
 int cnt = 0;

 hPsapi = LoadLibrary( _T("psapi.dll") );
 if (hPsapi == NULL)
 return FALSE;

 pEPM = (tEPM) GetProcAddress( hPsapi, "EnumProcessModules" );
 pGMFNE = (tGMFNE) GetProcAddress( hPsapi, "GetModuleFileNameExA" );
 pGMBN = (tGMFNE) GetProcAddress( hPsapi, "GetModuleBaseNameA" );
 pGMI = (tGMI) GetProcAddress( hPsapi, "GetModuleInformation" );
 if ( (pEPM == NULL) || (pGMFNE == NULL) || (pGMBN == NULL) || (pGMI == NULL) )
 {
 // we couldnt find all functions
 FreeLibrary(hPsapi);
 return FALSE;
 }

 hMods = (HMODULE*) malloc(sizeof(HMODULE) * (TTBUFLEN / sizeof HMODULE));
 tt = (char*) malloc(sizeof(char) * TTBUFLEN);
 tt2 = (char*) malloc(sizeof(char) * TTBUFLEN);
 if ( (hMods == NULL) || (tt == NULL) || (tt2 == NULL) )
 goto cleanup;

 if ( ! pEPM( hProcess, hMods, TTBUFLEN, &cbNeeded ) )
 {
 //_ftprintf(fLogFile, _T("%lu: EPM failed, GetLastError = %lu\n"), g_dwShowCount, gle );
 goto cleanup;
 }

 if ( cbNeeded > TTBUFLEN )
 {
 //_ftprintf(fLogFile, _T("%lu: More than %lu module handles. Huh?\n"), g_dwShowCount, lenof( hMods ) );
 goto cleanup;
 }

 for ( i = 0; i < cbNeeded / sizeof hMods[0]; i++ )
 {
 // base address, size
 pGMI(hProcess, hMods[i], &mi, sizeof mi );
 // image file name
 tt[0] = 0;
 pGMFNE(hProcess, hMods[i], tt, TTBUFLEN );
 // module name
 tt2[0] = 0;
 pGMBN(hProcess, hMods[i], tt2, TTBUFLEN );

 DWORD dwRes = this->LoadModule(hProcess, tt, tt2, (DWORD64) mi.lpBaseOfDll, mi.SizeOfImage);
 if (dwRes != ERROR_SUCCESS)
 this->m_parent->OnDbgHelpErr("LoadModule", dwRes, 0);
 cnt++;
 }

 cleanup:
 if (hPsapi != NULL) FreeLibrary(hPsapi);
 if (tt2 != NULL) free(tt2);
 if (tt != NULL) free(tt);
 if (hMods != NULL) free(hMods);

 return cnt != 0;
 } // GetModuleListPSAPI

 DWORD LoadModule(HANDLE hProcess, LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size)
 {
 CHAR *szImg = _strdup(img);
 CHAR *szMod = _strdup(mod);
 DWORD result = ERROR_SUCCESS;
 if ( (szImg == NULL) || (szMod == NULL) )
 result = ERROR_NOT_ENOUGH_MEMORY;
 else
 {
 if (pSLM(hProcess, 0, szImg, szMod, baseAddr, size) == 0)
 result = GetLastError();
 }
 ULONGLONG fileVersion = 0;
 if ( (m_parent != NULL) && (szImg != NULL) )
 {
 // try to retrive the file-version:
 if ( (this->m_parent->m_options & StackWalker::RetrieveFileVersion) != 0)
 {
 VS_FIXEDFILEINFO *fInfo = NULL;
 DWORD dwHandle;
 DWORD dwSize = GetFileVersionInfoSizeA(szImg, &dwHandle);
 if (dwSize > 0)
 {
 LPVOID vData = malloc(dwSize);
 if (vData != NULL)
 {
 if (GetFileVersionInfoA(szImg, dwHandle, dwSize, vData) != 0)
 {
 UINT len;
 TCHAR szSubBlock[] = _T("\\");
 if (VerQueryValue(vData, szSubBlock, (LPVOID*) &fInfo, &len) == 0)
 fInfo = NULL;
 else
 {
 fileVersion = ((ULONGLONG)fInfo->dwFileVersionLS) + ((ULONGLONG)fInfo->dwFileVersionMS << 32);
 }
 }
 free(vData);
 }
 }
 }

 // Retrive some additional-infos about the module
 IMAGEHLP_MODULE64_V2 Module;
 const char *szSymType = "-unknown-";
 if (this->GetModuleInfo(hProcess, baseAddr, &Module) != FALSE)
 {
 switch(Module.SymType)
 {
 case SymNone:
 szSymType = "-nosymbols-";
 break;
 case SymCoff:
 szSymType = "COFF";
 break;
 case SymCv:
 szSymType = "CV";
 break;
 case SymPdb:
 szSymType = "PDB";
 break;
 case SymExport:
 szSymType = "-exported-";
 break;
 case SymDeferred:
 szSymType = "-deferred-";
 break;
 case SymSym:
 szSymType = "SYM";
 break;
 case 8: //SymVirtual:
 szSymType = "Virtual";
 break;
 case 9: // SymDia:
 szSymType = "DIA";
 break;
 }
 }
 this->m_parent->OnLoadModule(img, mod, baseAddr, size, result, szSymType, Module.LoadedImageName, fileVersion);
 }
 if (szImg != NULL) free(szImg);
 if (szMod != NULL) free(szMod);
 return result;
 }
public:
 BOOL LoadModules(HANDLE hProcess, DWORD dwProcessId)
 {
 // first try toolhelp32
 if (GetModuleListTH32(hProcess, dwProcessId))
 return true;
 // then try psapi
 return GetModuleListPSAPI(hProcess);
 }


 BOOL GetModuleInfo(HANDLE hProcess, DWORD64 baseAddr, IMAGEHLP_MODULE64_V2 *pModuleInfo)
 {
 if(this->pSGMI == NULL)
 {
 SetLastError(ERROR_DLL_INIT_FAILED);
 return FALSE;
 }
 // First try to use the larger ModuleInfo-Structure
// memset(pModuleInfo, 0, sizeof(IMAGEHLP_MODULE64_V3));
// pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
// if (this->pSGMI_V3 != NULL)
// {
// if (this->pSGMI_V3(hProcess, baseAddr, pModuleInfo) != FALSE)
// return TRUE;
// // check if the parameter was wrong (size is bad...)
// if (GetLastError() != ERROR_INVALID_PARAMETER)
// return FALSE;
// }
 // could not retrive the bigger structure, try with the smaller one (as defined in VC7.1)...
 pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
 void *pData = malloc(4096); // reserve enough memory, so the bug in v6.3.5.1 does not lead to memory-overwrites...
 if (pData == NULL)
 {
 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 return FALSE;
 }
 memcpy(pData, pModuleInfo, sizeof(IMAGEHLP_MODULE64_V2));
 if (this->pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V2*) pData) != FALSE)
 {
 // only copy as much memory as is reserved...
 memcpy(pModuleInfo, pData, sizeof(IMAGEHLP_MODULE64_V2));
 pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
 free(pData);
 return TRUE;
 }
 free(pData);
 SetLastError(ERROR_DLL_INIT_FAILED);
 return FALSE;
 }
};

// #############################################################
StackWalker::StackWalker(DWORD dwProcessId, HANDLE hProcess)
{
 this->m_options = OptionsAll;
 this->m_modulesLoaded = FALSE;
 this->m_hProcess = hProcess;
 this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
 this->m_dwProcessId = dwProcessId;
 this->m_szSymPath = NULL;
}
StackWalker::StackWalker(int options, LPCSTR szSymPath, DWORD dwProcessId, HANDLE hProcess)
{
 this->m_options = options;
 this->m_modulesLoaded = FALSE;
 this->m_hProcess = hProcess;
 this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
 this->m_dwProcessId = dwProcessId;
 if (szSymPath != NULL)
 {
 this->m_szSymPath = _strdup(szSymPath);
 this->m_options |= SymBuildPath;
 }
 else
 this->m_szSymPath = NULL;
}

StackWalker::~StackWalker()
{
 if (m_szSymPath != NULL)
 free(m_szSymPath);
 m_szSymPath = NULL;
 if (this->m_sw != NULL)
 delete this->m_sw;
 this->m_sw = NULL;
}

BOOL StackWalker::LoadModules()
{
 if (this->m_sw == NULL)
 {
 SetLastError(ERROR_DLL_INIT_FAILED);
 return FALSE;
 }
 if (m_modulesLoaded != FALSE)
 return TRUE;

 // Build the sym-path:
 char *szSymPath = NULL;
 if ( (this->m_options & SymBuildPath) != 0)
 {
 const size_t nSymPathLen = 4096;
 szSymPath = (char*) malloc(nSymPathLen);
 if (szSymPath == NULL)
 {
 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 return FALSE;
 }
 szSymPath[0] = 0;
 // Now first add the (optional) provided sympath:
 if (this->m_szSymPath != NULL)
 {
 strcat_s(szSymPath, nSymPathLen, this->m_szSymPath);
 strcat_s(szSymPath, nSymPathLen, ";");
 }

 strcat_s(szSymPath, nSymPathLen, ".;");

 const size_t nTempLen = 1024;
 char szTemp[nTempLen];
 // Now add the current directory:
 if (GetCurrentDirectoryA(nTempLen, szTemp) > 0)
 {
 szTemp[nTempLen-1] = 0;
 strcat_s(szSymPath, nSymPathLen, szTemp);
 strcat_s(szSymPath, nSymPathLen, ";");
 }

 // Now add the path for the main-module:
 if (GetModuleFileNameA(NULL, szTemp, nTempLen) > 0)
 {
 szTemp[nTempLen-1] = 0;
 for (char *p = (szTemp+strlen(szTemp)-1); p >= szTemp; --p)
 {
 // locate the rightmost path separator
 if ( (*p == '\\') || (*p == '/') || (*p == ':') )
 {
 *p = 0;
 break;
 }
 } // for (search for path separator...)
 if (strlen(szTemp) > 0)
 {
 strcat_s(szSymPath, nSymPathLen, szTemp);
 strcat_s(szSymPath, nSymPathLen, ";");
 }
 }
 if (GetEnvironmentVariableA("_NT_SYMBOL_PATH", szTemp, nTempLen) > 0)
 {
 szTemp[nTempLen-1] = 0;
 strcat_s(szSymPath, nSymPathLen, szTemp);
 strcat_s(szSymPath, nSymPathLen, ";");
 }
 if (GetEnvironmentVariableA("_NT_ALTERNATE_SYMBOL_PATH", szTemp, nTempLen) > 0)
 {
 szTemp[nTempLen-1] = 0;
 strcat_s(szSymPath, nSymPathLen, szTemp);
 strcat_s(szSymPath, nSymPathLen, ";");
 }
 if (GetEnvironmentVariableA("SYSTEMROOT", szTemp, nTempLen) > 0)
 {
 szTemp[nTempLen-1] = 0;
 strcat_s(szSymPath, nSymPathLen, szTemp);
 strcat_s(szSymPath, nSymPathLen, ";");
 // also add the "system32"-directory:
 strcat_s(szTemp, nTempLen, "\\system32");
 strcat_s(szSymPath, nSymPathLen, szTemp);
 strcat_s(szSymPath, nSymPathLen, ";");
 }

 if ( (this->m_options & SymBuildPath) != 0)
 {
 if (GetEnvironmentVariableA("SYSTEMDRIVE", szTemp, nTempLen) > 0)
 {
 szTemp[nTempLen-1] = 0;
 strcat_s(szSymPath, nSymPathLen, "SRV*");
 strcat_s(szSymPath, nSymPathLen, szTemp);
 strcat_s(szSymPath, nSymPathLen, "\\websymbols");
 strcat_s(szSymPath, nSymPathLen, "*http://msdl.microsoft.com/download/symbols;");
 }
 else
 strcat_s(szSymPath, nSymPathLen, "SRV*c:\\websymbols*http://msdl.microsoft.com/download/symbols;");
 }
 }

 // First Init the whole stuff...
 BOOL bRet = this->m_sw->Init(szSymPath);
 if (szSymPath != NULL) free(szSymPath); szSymPath = NULL;
 if (bRet == FALSE)
 {
 this->OnDbgHelpErr("Error while initializing dbghelp.dll", 0, 0);
 SetLastError(ERROR_DLL_INIT_FAILED);
 return FALSE;
 }

 bRet = this->m_sw->LoadModules(this->m_hProcess, this->m_dwProcessId);
 if (bRet != FALSE)
 m_modulesLoaded = TRUE;
 return bRet;
}


// The following is used to pass the "userData"-Pointer to the user-provided readMemoryFunction
// This has to be done due to a problem with the "hProcess"-parameter in x64...
// Because this class is in no case multi-threading-enabled (because of the limitations 
// of dbghelp.dll) it is "safe" to use a static-variable
static StackWalker::PReadProcessMemoryRoutine s_readMemoryFunction = NULL;
static LPVOID s_readMemoryFunction_UserData = NULL;

BOOL StackWalker::ShowCallstack(HANDLE hThread, const CONTEXT *context, PReadProcessMemoryRoutine readMemoryFunction, LPVOID pUserData)
{
 CONTEXT c;;
 CallstackEntry csEntry;
 IMAGEHLP_SYMBOL64 *pSym = NULL;
 StackWalkerInternal::IMAGEHLP_MODULE64_V2 Module;
 IMAGEHLP_LINE64 Line;
 int frameNum;

 if (m_modulesLoaded == FALSE)
 this->LoadModules(); // ignore the result...

 if (this->m_sw->m_hDbhHelp == NULL)
 {
 SetLastError(ERROR_DLL_INIT_FAILED);
 return FALSE;
 }

 s_readMemoryFunction = readMemoryFunction;
 s_readMemoryFunction_UserData = pUserData;

 if (context == NULL)
 {
 // If no context is provided, capture the context
 if (hThread == GetCurrentThread())
 {
 GET_CURRENT_CONTEXT(c, USED_CONTEXT_FLAGS);
 }
 else
 {
 SuspendThread(hThread);
 memset(&c, 0, sizeof(CONTEXT));
 c.ContextFlags = USED_CONTEXT_FLAGS;
 if (GetThreadContext(hThread, &c) == FALSE)
 {
 ResumeThread(hThread);
 return FALSE;
 }
 }
 }
 else
 c = *context;

 // init STACKFRAME for first call
 STACKFRAME64 s; // in/out stackframe
 memset(&s, 0, sizeof(s));
 DWORD imageType;
#ifdef _M_IX86
 // normally, call ImageNtHeader() and use machine info from PE header
 imageType = IMAGE_FILE_MACHINE_I386;
 s.AddrPC.Offset = c.Eip;
 s.AddrPC.Mode = AddrModeFlat;
 s.AddrFrame.Offset = c.Ebp;
 s.AddrFrame.Mode = AddrModeFlat;
 s.AddrStack.Offset = c.Esp;
 s.AddrStack.Mode = AddrModeFlat;
#elif _M_X64
 imageType = IMAGE_FILE_MACHINE_AMD64;
 s.AddrPC.Offset = c.Rip;
 s.AddrPC.Mode = AddrModeFlat;
 s.AddrFrame.Offset = c.Rsp;
 s.AddrFrame.Mode = AddrModeFlat;
 s.AddrStack.Offset = c.Rsp;
 s.AddrStack.Mode = AddrModeFlat;
#elif _M_IA64
 imageType = IMAGE_FILE_MACHINE_IA64;
 s.AddrPC.Offset = c.StIIP;
 s.AddrPC.Mode = AddrModeFlat;
 s.AddrFrame.Offset = c.IntSp;
 s.AddrFrame.Mode = AddrModeFlat;
 s.AddrBStore.Offset = c.RsBSP;
 s.AddrBStore.Mode = AddrModeFlat;
 s.AddrStack.Offset = c.IntSp;
 s.AddrStack.Mode = AddrModeFlat;
#else
#error "Platform not supported!"
#endif

 pSym = (IMAGEHLP_SYMBOL64 *) malloc(sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
 if (!pSym) goto cleanup; // not enough memory...
 memset(pSym, 0, sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
 pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
 pSym->MaxNameLength = STACKWALK_MAX_NAMELEN;

 memset(&Line, 0, sizeof(Line));
 Line.SizeOfStruct = sizeof(Line);

 memset(&Module, 0, sizeof(Module));
 Module.SizeOfStruct = sizeof(Module);

 for (frameNum = 0; ; ++frameNum )
 {
 // get next stack frame (StackWalk64(), SymFunctionTableAccess64(), SymGetModuleBase64())
 // if this returns ERROR_INVALID_ADDRESS (487) or ERROR_NOACCESS (998), you can
 // assume that either you are done, or that the stack is so hosed that the next
 // deeper frame could not be found.
 // CONTEXT need not to be suplied if imageTyp is IMAGE_FILE_MACHINE_I386!
 if ( ! this->m_sw->pSW(imageType, this->m_hProcess, hThread, &s, &c, myReadProcMem, this->m_sw->pSFTA, this->m_sw->pSGMB, NULL) )
 {
 this->OnDbgHelpErr("StackWalk64", GetLastError(), s.AddrPC.Offset);
 break;
 }

 csEntry.offset = s.AddrPC.Offset;
 csEntry.name[0] = 0;
 csEntry.undName[0] = 0;
 csEntry.undFullName[0] = 0;
 csEntry.offsetFromSmybol = 0;
 csEntry.offsetFromLine = 0;
 csEntry.lineFileName[0] = 0;
 csEntry.lineNumber = 0;
 csEntry.loadedImageName[0] = 0;
 csEntry.moduleName[0] = 0;
 if (s.AddrPC.Offset == s.AddrReturn.Offset)
 {
 this->OnDbgHelpErr("StackWalk64-Endless-Callstack!", 0, s.AddrPC.Offset);
 break;
 }
 if (s.AddrPC.Offset != 0)
 {
 // we seem to have a valid PC
 // show procedure info (SymGetSymFromAddr64())
 if (this->m_sw->pSGSFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromSmybol), pSym) != FALSE)
 {
 // TODO: Mache dies sicher...!
 strcpy_s(csEntry.name, pSym->Name);
 // UnDecorateSymbolName()
 this->m_sw->pUDSN( pSym->Name, csEntry.undName, STACKWALK_MAX_NAMELEN, UNDNAME_NAME_ONLY );
 this->m_sw->pUDSN( pSym->Name, csEntry.undFullName, STACKWALK_MAX_NAMELEN, UNDNAME_COMPLETE );
 }
 else
 {
 this->OnDbgHelpErr("SymGetSymFromAddr64", GetLastError(), s.AddrPC.Offset);
 }

 // show line number info, NT5.0-method (SymGetLineFromAddr64())
 if (this->m_sw->pSGLFA != NULL )
 { // yes, we have SymGetLineFromAddr64()
 if (this->m_sw->pSGLFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromLine), &Line) != FALSE)
 {
 csEntry.lineNumber = Line.LineNumber;
 // TODO: Mache dies sicher...!
 strcpy_s(csEntry.lineFileName, Line.FileName);
 }
 else
 {
 this->OnDbgHelpErr("SymGetLineFromAddr64", GetLastError(), s.AddrPC.Offset);
 }
 } // yes, we have SymGetLineFromAddr64()

 // show module info (SymGetModuleInfo64())
 if (this->m_sw->GetModuleInfo(this->m_hProcess, s.AddrPC.Offset, &Module ) != FALSE)
 { // got module info OK
 switch ( Module.SymType )
 {
 case SymNone:
 csEntry.symTypeString = "-nosymbols-";
 break;
 case SymCoff:
 csEntry.symTypeString = "COFF";
 break;
 case SymCv:
 csEntry.symTypeString = "CV";
 break;
 case SymPdb:
 csEntry.symTypeString = "PDB";
 break;
 case SymExport:
 csEntry.symTypeString = "-exported-";
 break;
 case SymDeferred:
 csEntry.symTypeString = "-deferred-";
 break;
 case SymSym:
 csEntry.symTypeString = "SYM";
 break;
#if API_VERSION_NUMBER >= 9
 case SymDia:
 csEntry.symTypeString = "DIA";
 break;
#endif
 case 8: //SymVirtual:
 csEntry.symTypeString = "Virtual";
 break;
 default:
 //_snprintf( ty, sizeof ty, "symtype=%ld", (long) Module.SymType );
 csEntry.symTypeString = NULL;
 break;
 }

 // TODO: Mache dies sicher...!
 strcpy_s(csEntry.moduleName, Module.ModuleName);
 csEntry.baseOfImage = Module.BaseOfImage;
 strcpy_s(csEntry.loadedImageName, Module.LoadedImageName);
 } // got module info OK
 else
 {
 this->OnDbgHelpErr("SymGetModuleInfo64", GetLastError(), s.AddrPC.Offset);
 }
 } // we seem to have a valid PC

 CallstackEntryType et = nextEntry;
 if (frameNum == 0)
 et = firstEntry;
 this->OnCallstackEntry(et, csEntry);
 
 if (s.AddrReturn.Offset == 0)
 {
 this->OnCallstackEntry(lastEntry, csEntry);
 SetLastError(ERROR_SUCCESS);
 break;
 }
 } // for ( frameNum )

 cleanup:
 if (pSym) free( pSym );

 if (context == NULL)
 ResumeThread(hThread);

 return TRUE;
}

BOOL __stdcall StackWalker::myReadProcMem(
 HANDLE hProcess,
 DWORD64 qwBaseAddress,
 PVOID lpBuffer,
 DWORD nSize,
 LPDWORD lpNumberOfBytesRead
 )
{
 if (s_readMemoryFunction == NULL)
 {
 SIZE_T st;
 BOOL bRet = ReadProcessMemory(hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, &st);
 *lpNumberOfBytesRead = (DWORD) st;
 //printf("ReadMemory: hProcess: %p, baseAddr: %p, buffer: %p, size: %d, read: %d, result: %d\n", hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, (DWORD) st, (DWORD) bRet);
 return bRet;
 }
 else
 {
 return s_readMemoryFunction(hProcess, qwBaseAddress, lpBuffer, nSize, lpNumberOfBytesRead, s_readMemoryFunction_UserData);
 }
}

void StackWalker::OnLoadModule(LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size, DWORD result, LPCSTR symType, LPCSTR pdbName, ULONGLONG fileVersion)
{
 CHAR buffer[STACKWALK_MAX_NAMELEN];
 if (fileVersion == 0)
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s'\n", img, mod, (LPVOID) baseAddr, size, result, symType, pdbName);
 else
 {
 DWORD v4 = (DWORD) fileVersion & 0xFFFF;
 DWORD v3 = (DWORD) (fileVersion>>16) & 0xFFFF;
 DWORD v2 = (DWORD) (fileVersion>>32) & 0xFFFF;
 DWORD v1 = (DWORD) (fileVersion>>48) & 0xFFFF;
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s', fileVersion: %d.%d.%d.%d\n", img, mod, (LPVOID) baseAddr, size, result, symType, pdbName, v1, v2, v3, v4);
 }
 OnOutput(buffer);
}

void StackWalker::OnCallstackEntry(CallstackEntryType eType, CallstackEntry &entry)
{
 CHAR buffer[STACKWALK_MAX_NAMELEN];
 if ( (eType != lastEntry) && (entry.offset != 0) )
 {
 if (entry.name[0] == 0)
 strcpy_s(entry.name, "(function-name not available)");
 if (entry.undName[0] != 0)
 strcpy_s(entry.name, entry.undName);
 if (entry.undFullName[0] != 0)
 strcpy_s(entry.name, entry.undFullName);
 if (entry.lineFileName[0] == 0)
 {
 strcpy_s(entry.lineFileName, "(filename not available)");
 if (entry.moduleName[0] == 0)
 strcpy_s(entry.moduleName, "(module-name not available)");
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%p (%s): %s: %s\n", (LPVOID) entry.offset, entry.moduleName, entry.lineFileName, entry.name);
 }
 else
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s (%d): %s\n", entry.lineFileName, entry.lineNumber, entry.name);
 OnOutput(buffer);
 }
}

void StackWalker::OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr)
{
 CHAR buffer[STACKWALK_MAX_NAMELEN];
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "ERROR: %s, GetLastError: %d (Address: %p)\n", szFuncName, gle, (LPVOID) addr);
 OnOutput(buffer);
}

void StackWalker::OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName)
{
 CHAR buffer[STACKWALK_MAX_NAMELEN];
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "SymInit: Symbol-SearchPath: '%s', symOptions: %d, UserName: '%s'\n", szSearchPath, symOptions, szUserName);
 OnOutput(buffer);
 // Also display the OS-version
#if _MSC_VER <= 1200
 OSVERSIONINFOA ver;
 ZeroMemory(&ver, sizeof(OSVERSIONINFOA));
 ver.dwOSVersionInfoSize = sizeof(ver);
 if (GetVersionExA(&ver) != FALSE)
 {
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s)\n", 
 ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
 ver.szCSDVersion);
 OnOutput(buffer);
 }
#else
 OSVERSIONINFOEXA ver;
 ZeroMemory(&ver, sizeof(OSVERSIONINFOEXA));
 ver.dwOSVersionInfoSize = sizeof(ver);
 if (GetVersionExA( (OSVERSIONINFOA*) &ver) != FALSE)
 {
 _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s) 0x%x-0x%x\n", 
 ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
 ver.szCSDVersion, ver.wSuiteMask, ver.wProductType);
 OnOutput(buffer);
 }
#endif
}

void StackWalker::OnOutput(LPCSTR buffer)
{
 OutputDebugStringA(buffer);
}