L_CaptureFullScreen

#include "l_bitmap.h"

L_INT L_CaptureFullScreen(pBitmap, uStructSize, pCaptureInfo, uInfoStructSize, pfnCaptureCallback, pUserData)

pBITMAPHANDLE pBitmap;

/* pointer to the bitmap handle */

L_UINT uBitmapStructSize;

/* size in bytes, of the structure pointed to by pBitmap */

pLEADCAPTUREINFO pCaptureInfo;

/* pointer to info structure */

L_UINT uInfoStructSize;

/* size in bytes, of the structure pointed to by pCaptureInfo */

CAPTURECALLBACK pfnCaptureCallback;

/* optional callback function */

L_VOID L_FAR * pUserData;

/* pointer to more parameters for the callback */

Captures an image of the entire screen.

Parameter

Description

pBitmap

Pointer to a bitmap handle that references the captured data.

uBitmapStructSize

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

pCaptureInfo

Address of LEADCAPTUREINFO structure to be filled with information regarding the captured image's source. Pass NULL if you are not interested in extra information about the capture.

uInfoStructSize

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

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.

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 L_FAR *. 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

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

This function captures an image of the entire screen. The callback can be used to do multiple captures, depending on the options set using L_SetCaptureOption.

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.

See Also

Functions:

L_SetCaptureOption, CAPTURECALLBACK, L_StopCapture

Example

int MyMain()
{
   BITMAPHANDLE              Bitmap;
   LEADCAPTUREINFO           CaptureInfo;

     /*To call the L_CaptureFullScreen*/
     L_CaptureFullScreen (
                          &Bitmap, sizeof(BITMAPHANDLE), 
                          &CaptureInfo, sizeof(LEADCAPTUREINFO),
                          pfnCaptureCallback, 
                          NULL
                         ); 
      L_FreeBitmap(&Bitmap);

return 0;
}

L_INT L_EXPORT pfnCaptureCallback (pBITMAPHANDLE pBitmap, pLEADCAPTUREINFO pCaptureInfo, L_VOID L_FAR* pUserData)
{
   /* save the captured image */
   return( L_SaveBitmap(TEXT("d:\\temp\\test.bmp"), pBitmap, FILE_BMP, 0, 0, NULL));
}