virtual L_INT LBitmapBase::SetDataPointer(pData, dwSize)
Sets the data pointer for the bitmap to the specified data pointer pData.
Data pointer used to set the bitmaps data pointer.
Size of the data buffer pointed to by pData.
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
This function can be used to change the data pointer of a bitmap that was created by LBitmapBase::CreateBitmap, or allocated by LBitmapBase::Allocate, with memory type TYPE_USER. The data pointer to of the bitmap is set to the data pointer passed in through pData.
You are responsible for managing the image data. LBitmapBase::Free will not free pData.
The memory buffer pointed to by pData must be valid when the bitmap is being used. If you free a memory buffer that is referenced by a bitmap, you will get access violations when you try to use that bitmap.
If you pass NULL for pData, the bitmap has no bitmap data. You should not try to use a bitmap that has no data pointer.
NOTE: To calculate the correct size for a single row of image data:
(((Width * BitsPerPixel) + 31) >> 3)) &~3
#define BITMAP_WIDTH 256
#define BITMAP_HEIGHT 256
L_INT LBitmapBase__SetDataPointerExample(HWND hWnd)
HGLOBAL hGlobal1, hGlobal2;
L_UCHAR *pBuffer1, *pBuffer2;
//pBuffer1 points to raw data with 256 shades of red
//pBuffer2 points to raw data with 256 shades of green
hGlobal1 = GlobalAlloc(GMEM_MOVEABLE, BITMAP_WIDTH * BITMAP_HEIGHT * 3);
pBuffer1 = (L_UCHAR*)GlobalLock(hGlobal1);
hGlobal2 = GlobalAlloc(GMEM_MOVEABLE, BITMAP_WIDTH * BITMAP_HEIGHT * 3);
pBuffer2 = (L_UCHAR*)GlobalLock(hGlobal2);
L_INT iCol, iRow, iCounter;
iCounter = 0;
for(iCol = 0; iCol < BITMAP_WIDTH; iCol++)
for (iRow=0; iRow < BITMAP_HEIGHT; iRow++)
pBuffer1[iCounter + 0] = 0; //Blue
pBuffer1[iCounter + 1] = 0; //Green
pBuffer1[iCounter + 2] = (L_UCHAR)iCol; //Red
pBuffer2[iCounter + 0] = 0; //Blue
pBuffer2[iCounter + 1] = (L_UCHAR) iCol; //Green
pBuffer2[iCounter + 2] = 0; //Red
iCounter = iCounter + 3;
// this sets the image to be pBuffer1
BITMAP_WIDTH * BITMAP_HEIGHT * 3);
nRet =BitmapBase.Save(MAKE_IMAGE_PATH(TEXT("Test1.bmp")), FILE_BMP, 24,2,0,NULL);
nRet =BitmapBase.SetDataPointer(pBuffer2, BITMAP_WIDTH * BITMAP_HEIGHT * 3);
nRet =BitmapBase.Save(MAKE_IMAGE_PATH(TEXT("Test2.bmp")), FILE_BMP, 24,2,0,NULL);
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