winapi: from HDC to an HBITMAP

我想做一些我认为相当简单的事情，但由于我是winapi的新手，我发现了很多问题。基本上我有一个HDC（我从加载的位图中BitBlitting），我正在上面画一个矩形。然后我想把HDC BitBlt到一个新的HBITMAP对象上，但遗憾的是，现在没有用。

这是我的代码，我已经尝试了几个小时，现在

BITMAPINFO info;
Bitmap *tempbmp = Bitmap::FromFile(L"C:\Users\abelajc\Pictures\BackgroundImage.png", false);
HBITMAP loadedbackground;
tempbmp->GetHBITMAP(NULL, &loadedbackground);
HBRUSH hRed = CreateSolidBrush(RGB(255, 0, 0));
HDC pDC = GetDC(0);
HDC TmpDC = CreateCompatibleDC(pDC); //main DC on which we will paint on
HDC dcBmp = CreateCompatibleDC(TmpDC); //DC for the loadedbackground HBitmap
HGDIOBJ TmpObj2 = SelectObject(dcBmp , tempbmp); //Selecting Bitmap in DC
BitBlt(TmpDC, 0, 0, 512, 512, dcBmp, 0, 0, SRCCOPY);
SelectObject(dcBmp, TmpObj2); //Deselecting Bitmap from DC
DeleteDC(dcBmp);
RECT rectangle;
SetRect(&rectangle, 5, 5, 20, 20);
FillRect(TmpDC, &rectangle, hRed);
HDC hCompDC = CreateCompatibleDC(TmpDC);
HBITMAP hBmp = CreateCompatibleBitmap(TmpDC, 512, 512);
HBITMAP hOld = (HBITMAP)SelectObject(hCompDC, hBmp);
BitBlt(hCompDC, 0, 0, 512, 512, TmpDC, 0, 0, SRCCOPY);
SelectObject(hCompDC, hOld);
DeleteDC(hCompDC);
Bitmap *image = new Bitmap(hBmp, NULL);