Pointer to the bitmap handle that contains the image information.
Pointer to the caller's input buffer where the callback function must put the data.
The number of the first line that the callback function must put in the buffer.
The number of lines that the callback function must put in the buffer.
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.
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_VOID * 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_GetBitmapRow (pBitmap, pBuffer, i, pBitmap->BytesPerLine);
/* Move the pointer to the position in the buffer for the next row */
pBuffer += pBitmap->BytesPerLine;
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