// QPC_Check.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <stdio.h>
#include <conio.h> // _kbhit()
#include <windows.h> // Sleep()
// This constant is used to check for forward jumps of the performance counter
// It is dependent upon the frequency of the counter (determined via 
// QueryPerformanceFrequency() -- not used in this test app for brevity).
#define FWD_LIMIT (0x1000000)
int _tmain(int argc, _TCHAR* argv[])
{
 BOOL bDone = FALSE ;
 char cUserInput ;
 LARGE_INTEGER liLastCount, liNewCount ;
 int nBackEventTally = 0 ;
 int nFwdEventTally = 0 ;
 
 (void)printf("QPC Check - v1.0 Hit 'c' to display current count, 'x' to exit\n") ;
 // Read counter to prime the LastCount value
 if (TRUE != QueryPerformanceCounter ( &liLastCount )) 
 {
 printf("QPC read error\n") ;
 bDone = TRUE ;
 }
 while (FALSE == bDone) 
 {
 // Respond to user input, if any
 if (0 != _kbhit()) // _kbhit() returns 0 or "non-zero"
 {
 // Get the key
 cUserInput = _getch() ;
 if (('x' == cUserInput) &#124;&#124; ('X' == cUserInput)) 
 {
 printf("Exiting QPC_Check\n") ;
 bDone = TRUE ;
 }
 // Print status and last count
 else if (('c' == cUserInput) &#124;&#124; ('C' == cUserInput)) 
 {
 printf("Backward events: %d Forward events: %d", nBackEventTally, nFwdEventTally ) ;
 printf(" Last Count = 0x%08x:%08x\n", liLastCount.u.HighPart, liLastCount.u.LowPart ) ;
 }
 else if ('b' == cUserInput) 
 {
 printf("Testing backward event...\n") ;
 liLastCount.QuadPart += FWD_LIMIT ;
 }
 else if ('f' == cUserInput) 
 {
 printf("Testing forward event...\n") ;
 liLastCount.QuadPart -= (FWD_LIMIT + 1);
 }
 }
 // Read & check counter
 if (TRUE == QueryPerformanceCounter ( &liNewCount )) 
 {
 // Check for new < last if (liNewCount.QuadPart < liLastCount.QuadPart) { nBackEventTally++ ; printf("Jump backward event: Last = 0x%08x:%08x, New = 0x%08x:%08x\n", liLastCount.u.HighPart, liLastCount.u.LowPart, liNewCount.u.HighPart, liNewCount.u.LowPart ) ; } // Check for new>> last
 if (liNewCount.QuadPart> (liLastCount.QuadPart + FWD_LIMIT))
 {
 nFwdEventTally++ ;
 printf("Jump forward event: Last = 0x%08x:%08x, New = 0x%08x:%08x\n", 
 liLastCount.u.HighPart, liLastCount.u.LowPart,
 liNewCount.u.HighPart, liNewCount.u.LowPart ) ;
 }
 // Update LastCount with new value
 liLastCount.QuadPart = liNewCount.QuadPart ;
 }
 else 
 {
 printf("QPC read error\n" ) ;
 bDone = TRUE ;
 }
 Sleep( 50 ) ; // wait 50 millisecs then check counter again
 }
	return 0;
}
</div><div class="naked_ctrl">
<form action="/index.cgi/larger-text" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://www.virtualbox.org/raw-attachment/ticket/12076/QPC_Check.cpp">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://www.virtualbox.org/raw-attachment/ticket/12076/QPC_Check.cpp" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast">配色反転</option>
<option value="larger-text" selected="selected">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>