Gdiplus::Bitmap* CreateBitmapFromHBITMAP 这个代码这里是个BUG吗？

[vbmaxps]

Gdiplus::Bitmap *CreateBitmapFromHBITMAP(HBITMAP hBitmap)
{
BITMAP bmp = {0};
if (0 == GetObject(hBitmap, sizeof(BITMAP), (LPVOID)&bmp))
{
return FALSE;
}
// Although we can get bitmap data address by bmp.bmBits member of BITMAP
// which is got by GetObject function sometime,
// we can determine the bitmap data in the HBITMAP is arranged bottom-up
// or top-down, so we should always use GetDIBits to get bitmap data.
BYTE *piexlsSrc = NULL;
LONG cbSize = bmp.bmWidthBytes * bmp.bmHeight;
piexlsSrc = new BYTE[cbSize];
BITMAPINFO bmpInfo = {0};
// We should initialize the first six members of BITMAPINFOHEADER structure.
// A bottom-up DIB is specified by setting the height to a positive number,
// while a top-down DIB is specified by setting the height to a negative number.
bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmpInfo.bmiHeader.biWidth = bmp.bmWidth;
bmpInfo.bmiHeader.biHeight = bmp.bmHeight; // 正数，说明数据从下到上，如未负数，则从上到下
bmpInfo.bmiHeader.biPlanes = bmp.bmPlanes;
bmpInfo.bmiHeader.biBitCount = bmp.bmBitsPixel;
bmpInfo.bmiHeader.biCompression = BI_RGB;
HDC hdcScreen = CreateDC(L"DISPLAY", NULL, NULL, NULL);
LONG cbCopied = GetDIBits(hdcScreen, hBitmap, 0, bmp.bmHeight,
piexlsSrc, &bmpInfo, DIB_RGB_COLORS);
DeleteDC(hdcScreen);
if (0 == cbCopied)
{
delete[] piexlsSrc;
return FALSE;
}
// Create an GDI+ Bitmap has the same dimensions with hbitmap
Gdiplus::Bitmap *pBitmap = new Gdiplus::Bitmap(bmp.bmWidth, bmp.bmHeight, PixelFormat32bppPARGB);
// Access to the Gdiplus::Bitmap's pixel data
Gdiplus::BitmapData bitmapData;
Gdiplus::Rect rect(0, 0, bmp.bmWidth, bmp.bmHeight);
if (Gdiplus::Ok != pBitmap->LockBits(&rect, Gdiplus::ImageLockModeRead,
PixelFormat32bppPARGB, &bitmapData))
{
delete (pBitmap);
return NULL;
}
BYTE *pixelsDest = (BYTE *)bitmapData.Scan0;
int nLinesize = bmp.bmWidth * sizeof(UINT);
int nHeight = bmp.bmHeight;
// Copy pixel data from HBITMAP by bottom-up.
for (int y = 0; y < nHeight; y++)
{
// 从下到上复制数据，因为前面设置高度时是正数。
memcpy_s(
(pixelsDest + y * nLinesize),
nLinesize,
(piexlsSrc + (nHeight - y - 1) * nLinesize),
nLinesize);
}
// Copy the data in temporary buffer to pBitmap
if (Gdiplus::Ok != pBitmap->UnlockBits(&bitmapData))
{
delete pBitmap;//这里 删除了 下面还是返回了pBitmap 不应该 pBitmap = nullptr;
}
delete[] piexlsSrc;
return pBitmap;
}