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L_CaptureFromExe

Summary

Captures an image from the specified resource stored in an EXE or DLL.

Syntax

#include "l_bitmap.h"

L_LTSCR_API L_INT L_CaptureFromExe(pBitmap, uBitmapStructSize, pszFileName, nResType, pResID, bCaptureByIndex, clrBackGnd, pfnCaptureCallback, pUserData)

Parameters

pBITMAPHANDLE pBitmap

Pointer to a bitmap handle that references the captured data.

L_UINT uBitmapStructSize

Size in bytes, of the structure pointed to by pBitmap, for versioning. Use sizeof(BITMAPHANDLE).

L_TCHAR * pszFileName

Character string containing the name of the exe (or dll) from which the resource should be captured.

L_INT nResType

Specifies the type of resource to capture. Possible values for RETYPEENUM are:

Value	Meaning
RESTYPE_BITMAP	Capture a bitmap resource
RESTYPE_ICON	Capture an icon resource
RESTYPE_CURSOR	Capture a cursor resource

L_TCHAR *pResID

Specifies the index of the resource to capture. You can use MAKEINDEX or MAKERESOURCEID macros to convert the resource ids to strings.

L_BOOL bCaptureByIndex

Flag of the requested resource. Possible values are:

Value	Meaning
TRUE	Indicates that pResID is the index position of the requested resource.
FALSE	Indicates that pResID is the resource ID of the requested resource.

COLORREF clrBackGnd

Background color for icons.

CAPTURECALLBACK pfnCaptureCallback

Optional callback function for additional processing.

If you do not provide a callback function, use NULL as the value of this parameter. If you do provide a callback function, use the function pointer as the value of this parameter. The callback function must adhere to the function prototype described in CAPTURECALLBACK Function.

L_VOID * pUserData

Void pointer that you can use to pass one or more additional parameters that the callback function needs.

To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID ;*. The callback function, which receives the address in its own pUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function is similar to L_CaptureFromExeDlg, but does not display a dialog box. It simply captures the resource identified by nResType and pResID, from pszFileName. The captured bitmap may or may not have a region, depending on the transparency information of the captured resource.

Use L_CaptureGetResCount to determine the number of resources in an executable.

Required DLLs and Libraries

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

Example

static L_INT EXT_CALLBACK pfnCaptureCallback(pBITMAPHANDLE    pBitmap, 
                                             pLEADCAPTUREINFO pCaptureInfo, 
                                             L_VOID         * pUserData) 
{ 
   UNREFERENCED_PARAMETER(pCaptureInfo); 
   UNREFERENCED_PARAMETER(pUserData); 
 
   /* save the captured image */ 
   return(L_SaveBitmap (MAKE_IMAGE_PATH(TEXT("FromEXE.bmp")), pBitmap, FILE_BMP, 0, 0, NULL)); 
} 
 
L_INT CaptureFromEXEExample(L_VOID) 
{ 
   BITMAPHANDLE Bitmap; 
 
   /*To call the L_CaptureFromExe*/ 
   L_INT nRet = L_CaptureFromExe(&Bitmap, sizeof(BITMAPHANDLE), 
                                 MAKE_IMAGE_PATH(TEXT("ExeWithResources.exe")), 
                                 RESTYPE_ICON, 
                                 0, 
                                 TRUE, 
                                 RGB(255,192,192), 
                                 pfnCaptureCallback, 
                                 NULL); 
   if (Bitmap.Flags.Allocated) 
      L_FreeBitmap (&Bitmap); 
   return nRet; 
}