This function is called if the buffer of the LBuffer object used by the LMemoryFile::SaveFileBuffer function is not large enough to accommodate the file in memory. This function gives the user the opportunity to reallocate the buffer to an adequate size.
virtual L_INT LMemoryFile::SaveFileBufferCallBack(pLBuffer, uRequiredSize)
Pointer to an LBuffer object into which the bitmap will be saved. This pointer can be used to increase the size of the buffer of the LBuffer object.
Minimum buffer size, in bytes, required to save the bitmap or file.
|SUCCESS||The function was successful.|
|FAILURE||An error occurred.|
This callback function is optional, but recommended. If the callback is not used, then the user must provide the LMemoryFile::SaveFileBuffer function with a buffer that is large enough to hold the memory file. If the buffer is not large enough and the callback is not used, LMemoryFile::SaveFileBuffer will fail.
To use this function, the user must derive a new class from the LMemoryFile class and override this function. The use of this callback function must also be enabled by calling LBase::EnableCallBack.
If the callback successfully reallocates the buffer, it should return SUCCESS.
If the callback fails to successfully reallocate the buffer, it should return FAILURE.
This function does not support signed data images, unless they are DICOM images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image that is not a DICOM image is passed to this function.
// Derive a new class from LMemoryFile and
// override LMemoryFile::SaveFileBufferCallBack
class LUserMemoryFileSMB : public LMemoryFile
virtual L_INT SaveFileBufferCallBack(LBuffer * pLBuffer,
wsprintf(szMessage, TEXT("Initial LEAD buffer size: %d\n"), pLBuffer->GetSize());
wsprintf(szMessage, TEXT("%sThe required size: %d"), szMessage, uRequiredSize);
MessageBox(NULL, szMessage, TEXT("Buffer Info"), MB_OK);
// Try to reallocate the LEAD buffer
L_INT nRet = pLBuffer->Reallocate(uRequiredSize);
if (nRet == SUCCESS)
L_INT LMemoryFile__SaveFileBufferCallBackExample(LBitmapBase & Bitmap)
LBuffer Buffer(1000); // 1000 bytes initially
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