lib.sys.listdir Re: C Function returning a table to LUA?
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- Subject: lib.sys.listdir Re: C Function returning a table to LUA?
- From: Asko Kauppi <asko.kauppi@...>
- Date: 2003年9月29日 17:11:24 +0300
Both LuaCheia and GluaX provide the kind of service you mention, and it
works for Linux, Win32 and OS X. From gluax 'sys_module.c' (returns a
table using gluax macros):
//---
// [tbl]= listdir( [path_str [,mask_str]] )
//
// Returns: { "file1.ext", "file2.ext", "dir1/", ... }
// { } (if no files matching the 'mask')
// nil (if no such directory)
//
// Note: Tree recursion etc. are done in a Lua wrapper.
//
GLUA_FUNC( listdir )
{
const char* path= glua_getString(1);
const char* mask= glua_getString(2);
DIR* dir;
struct dirent* entry;
uint n=0;
if (!path || !path[0])
path= "."; // default (current dir)
dir= opendir( path );
//
// NULL on failure, 'errno' gives more info:
//
// ENOENT: No such directory
// EINVAL: Invalid argument or directory name
// ENOMEM: Not enough memory to perform the operation
if (!dir) break; // jumps to 'GLUA_END', returns nil.
glua_pushTable();
{
char buf[ PATH_MAX ];
while( (entry= readdir(dir)) != NULL )
{
const char* name= entry->d_name;
if ( (strcmp(name,".")==0) || (strcmp(name,"..")==0) )
continue; // skip "." and ".." always
if (mask && !Loc_MaskMatch(name,mask))
continue; // masked out
if (Loc_IsDir(path,name))
{
name= strcpy_safe( buf, name, sizeof(buf) );
strcat_safe( buf, "/", sizeof(buf) );
}
glua_setTable_str_i( ++n, name );
}
}
closedir( dir );
}
GLUA_END
Andy Bushnell kirjoittaa maanantaina, 29. syyskuuta 2003, kello 10:18:
Hi,
Please excuse my ignorance (i'm a Lua newbie).
I have a 'C' function (getFileListing) that has been registered with
Lua. It
compiles a list of files in the current working directory. Everything
works
fine until I try *returning* this info to Lua. How can I do it?
My Lua script (right now) makes the call...
getFileListing()
Nothing happens but printf's in the getFileListing function show that
its
being called & doing the right thing. So now I have an array of
strings (the
file names) in the 'C' side but I want to pass this info back to the
script.
I think I need to use a "Table" to pass this info to Lua, but tables
are new
to me and I cant see an example which does what I want (which, as a
newbie,
im looking for!).
I'd like my script (I think) to look something like ...
t = getFileListing() -- where t is the returned table
-- check for table size
-- iterate through table getting the file listing names
(im not sure of the exact table iteration syntax - but I can work that
out
later).
I hope this isnt too simple a question - but any help would greatly
appreciated.
Regards,
Andy