#include "l_bitmap.h"
L_INT pEXT_CALLBACK YourFunction (pBitmap, pBuffer, uRow, uLines, pUserData)
pBITMAPHANDLE pBitmap; |
pointer to the bitmap handle |
L_UCHAR* pBuffer; |
pointer to a buffer for the caller's input data |
L_UINT uRow; |
first line to write to the buffer |
L_UINT uLines; |
number of lines to write to the buffer |
L_VOID* pUserData; |
pointer to additional parameters |
Provides input to the L_SaveFile or L_SaveFileOffset function.
Parameter |
Description |
pBitmap |
Pointer to the bitmap handle that contains the image information. |
pBuffer |
Pointer to the caller's input buffer where the callback function must put the data. |
uRow |
The number of the first line that the callback function must put in the buffer. |
uLines |
The number of lines that the callback function must put in the buffer. |
pUserData |
A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of the calling function.) |
|
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
This type callback function is optional. If you provide a callback function, it must supply the image data. It can also do other useful things, such as updating a status bar. If you do not provide a callback function, the calling function saves data from the specified bitmap.
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 |
Functions: |
This FILESAVECALLBACK function supplies image data from the LEAD bitmap to fulfill the minimum requirements of the callback
L_INT EXT_CALLBACK SaveImageCB (pBITMAPHANDLE pBitmap,
L_UCHAR * pBuffer,
L_UINT nRowBegin,
L_UINT nRowsToGet,
L_VOID * pUserData)
{
UNREFERENCED_PARAMETER(pUserData);
L_UINT i; /* Row counter */
L_UINT nRowLast = nRowBegin + nRowsToGet; /* Used when counting rows */
/* Put the required rows in the buffer */
for (i = nRowBegin; i < nRowLast; i++)
{
/* Get a row from the bitmap and put it in the buffer */
L_AccessBitmap (pBitmap);
L_GetBitmapRow (pBitmap, pBuffer, i, pBitmap->BytesPerLine);
L_ReleaseBitmap (pBitmap);
/* Move the pointer to the position in the buffer for the next row */
pBuffer += pBitmap->BytesPerLine;
}
return (SUCCESS);
}
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