static L_SSIZE_T LFileSettings::GetPreLoadFilters(pszFilters, uSize, pnFixedFilters, pnCachedFilters)
Retrieves the current preloaded filters list.
Pointer to a character string to be updated with the current preloaded filters list.
The size in bytes of the buffer pointed to by pszFilters.
Pointer to a variable to be updated with the number of filters that should stay loaded in memory at all times. Pass NULL if it is not required.
Pointer to a variable to be updated with the number of filters that should be loaded. Pass NULL if it is not required.
Value | Meaning |
---|---|
>=0 | The size in bytes of the preloaded filters list. |
< 0 | An error occurred. Refer to Return Codes. |
In case the current preloaded filters list should be changed, call this function before calling the LFileSettings::PreloadFilters function.
The preload filters list contains the list of fixed and cached filters. For more information, refer to LFileSettings::PreloadFilters.
To retrieve the preloaded filters list, the user should:
Call the function passing pszFilters as NULL and uSize as 0 to retrieve the size required for the filters list as returned value.
Allocate a buffer of size returned value.
Call the function passing the allocated buffer to the pszFilters and the returned value to uSize to retrieve the filters list.
Win32, x64.
L_INT LFileSettings__GetPreLoadFiltersExample()
{
L_TCHAR * pszList = NULL;
L_INT nFixed;
L_INT nCached;
L_SIZE_T nRet;
LBitmap Bitmap;
L_TCHAR buf[80];
/* get the original filters list */
nRet = LFileSettings::GetPreLoadFilters(NULL, 0, NULL, NULL);
pszList = (L_TCHAR *)malloc(nRet*sizeof(L_TCHAR));
nRet = LFileSettings::GetPreLoadFilters(pszList, nRet, &nFixed, &nCached);
::MessageBox(NULL, pszList, TEXT("TEST"), MB_OK);
free(pszList);
wsprintf(buf, TEXT("fixed: %ld, cached: %ld"), nFixed, nCached);
::MessageBox(NULL, buf, TEXT("TEST"), MB_OK);
/* change the preload filters */
/* This example preloads the TGA, PCX and TIF filters */
/* and allows 1 filter to be cached, while always */
/* keeping 2 loaded. */
LFileSettings::PreLoadFilters( 2, 1, TEXT("TGA,PCX,TIF"));
/* get the new filters list */
nRet = LFileSettings::GetPreLoadFilters(NULL, 0, NULL, NULL);
pszList = (L_TCHAR *)malloc(nRet*sizeof(L_TCHAR));
nRet = LFileSettings::GetPreLoadFilters(pszList, nRet, &nFixed, &nCached);
::MessageBox(NULL, pszList, TEXT("TEST"), MB_OK);
free(pszList);
wsprintf(buf, TEXT("fixed: %ld, cached: %ld"), nFixed, nCached);
::MessageBox(NULL, buf, TEXT("TEST"), MB_OK);
/* try to load TGA */
nRet = Bitmap.Load(TEXT("d:\\temp\\test.tga"));
if(nRet == SUCCESS)
::MessageBox(NULL, TEXT("TGA loaded"), TEXT("TEST"), MB_OK);
}
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