LFileSettings::GetPreLoadFilters

#include "ltwrappr.h"

static L_SSIZE_T LFileSettings::GetPreLoadFilters(pszFilters, uSize, pnFixedFilters, pnCachedFilters)

L_TCHAR * pszFilters;	pointer to a character string to be updated with filters
L_SIZE_T uSize;	size in bytes of pszFilters
L_INT * pnFixedFilters;	pointer to a variable to be updated
L_INT * pnCachedFilters;	pointer to a variable to be updated

Retrieves the current preloaded filters list.

Parameter	Description
pszFilters	Pointer to a character string to be updated with the current preloaded filters list.
uSize	The size in bytes of the buffer pointed to by pszFilters.
pnFixedFilters	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.
pnCachedFilters	Pointer to a variable to be updated with the number of filters that should be loaded. Pass NULL if it is not required.

Returns

>=0	The size in bytes of the preloaded filters list.
< 0	An error occurred. Refer to Return Codes.

Comments

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:

1.	Call the function passing pszFilters as NULL and uSize as 0 to retrieve the size required for the filters list as returned value.
2.	Allocate a buffer of size (Returned Value * sizeof(L_TCHAR)).
3.	Call the function passing the allocated buffer to the pszFilters and the returned value to uSize to retrieve the filters list.

Required DLLs and Libraries

LTFIL

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

Example

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); 
}

Help Version 19.0.2017.10.27

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Summary of Features

Functions:	LFileSettings::PreLoadFilters, LFileSettings::IgnoreFilters, LFileSettings::GetIgnoreFilters, Class Members
Topics:	Raster Image Functions: Input/Output File Filters
	Loading File Filters