How to draw bitmap on the form - 如何在窗体上画（贴）位图

本文提供两个MFC应用程序示例，展示如何加载位图资源并将其居中绘制到窗口中。第一个示例使用`StretchBlt`函数，第二个示例使用`BitBlt`函数实现位图的绘制。

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1、Code

bool CPrjWebFoxExampleDlg::DrawPictureOnForm() { CPaintDC dc(this); // device context for painting CBitmap bitmap; CDC dcBackGround; CRect rect; BITMAP bm; bitmap.LoadBitmap(IDB_picMeInShenZhenAutoShow); dcBackGround.CreateCompatibleDC(&dc); dcBackGround.SelectObject(&bitmap); bitmap.GetBitmap(&bm); // Center bitmap in client rectangle GetClientRect(&rect); int x = (rect.Width() - bm.bmWidth) / 2; int y = (rect.Height() - bm.bmHeight) / 2; // Draw the bitmap dc.StretchBlt(x,y,bm.bmWidth,bm.bmHeight,&dcBackGround,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY); return true; }

2、Sample in the msdn

Example // This OnDraw() handler loads a bitmap from system resources, // centers it in the view, and uses BitBlt() to paint the bitmap // bits. void CBlat2View::OnDraw(CDC* pDC) { CBlat2Doc* pDoc = GetDocument(); ASSERT_VALID(pDoc); // load IDB_BITMAP1 from our resources CBitmap bmp; if (bmp.LoadBitmap(IDB_BITMAP1)) { // Get the size of the bitmap BITMAP bmpInfo; bmp.GetBitmap(&bmpInfo); // Create an in-memory DC compatible with the // display DC we're using to paint CDC dcMemory; dcMemory.CreateCompatibleDC(pDC); // Select the bitmap into the in-memory DC CBitmap* pOldBitmap = dcMemory.SelectObject(&bmp); // Find a centerpoint for the bitmap in the client area CRect rect; GetClientRect(&rect); int nX = rect.left + (rect.Width() - bmpInfo.bmWidth) / 2; int nY = rect.top + (rect.Height() - bmpInfo.bmHeight) / 2; // Copy the bits from the in-memory DC into the on- // screen DC to actually do the painting. Use the centerpoint // we computed for the target offset. pDC->BitBlt(nX, nY, bmpInfo.bmWidth, bmpInfo.bmHeight, &dcMemory, 0, 0, SRCCOPY); dcMemory.SelectObject(pOldBitmap); } else TRACE0("ERROR: Where's IDB_BITMAP1?/n"); }

3、MSDN Hyperlink

http://msdn.microsoft.com/en-us/library/aa293677(VS.60).aspx