What ’s so bad about drawing a bitmap like this, why the client area is completely dark

5954979

void CClipTest2View :: OnDraw (CDC * pDC)
{
CClipTest2Doc * pDoc = GetDocument ();
ASSERT_VALID (pDoc);
Ranch
         // Get bitmap from clipboard
HBITMAP hBmp = CCopyScr :: GetFromClip (this-> GetSafeHwnd ());

BITMAP bm;
GetObject (hBmp, sizeof (BITMAP),&bm);

CBitmap bmpDraw;
bmpDraw.CreateBitmap (bm.bmWidth, bm.bmHeight, bm.bmPlanes, bm.bmBitsPixel, bm.bmBits);

CDC memDC; // Define a compatible DC
memDC.CreateCompatibleDC (pDC); // Create compatible DC

CBitmap * pbmpOld = memDC.SelectObject (&bmpDraw); // Save the original DDB and select the new DDB into the DC
pDC-> BitBlt (0, 0, bm.bmWidth, bm.bmHeight,&memDC, 0, 0, SRCCOPY);

memDC.SelectObject (pbmpOld); // Selected into the original DDB
}

kkedward

bmpDraw.CreateBitmap (bm.bmWidth, bm.bmHeight, bm.bmPlanes, bm.bmBitsPixel, bm.bmBits);
After the create is complete, you need to load bitmap, either read from the file or load the bitmap ID in the resource

5954979

kkedward: What else should Load do after Create, not just one.
I'm in the Web mode. I want to read the bitmap from the clipboard, convert it to Base64, and then save it into the background database. So neither files nor resources will work.

5954979

Mainly take a part from some graphics, then draw a few strokes, and then save to the database

5954979

Does anyone know why? I draw both resources and files, and now I want to cut them from the clipboard and draw.

food0012

DEBUG to see if you really successfully obtained the bitmap file

2511718

You selected the bitmap you created, of course, it is completely dark

master20404

BITMAP bm;
GetObject (hBmp, sizeof (BITMAP),&bm);

CBitmap bmpDraw;
bmpDraw.CreateBitmap (bm.bmWidth, bm.bmHeight, bm.bmPlanes, bm.bmBitsPixel, bm.bmBits);

Replace with the above
CBitmap bmpDraw;
bmpDraw.Attach (hBmp);