显示一张位图,基本的有以下三种形式: 一、位图资源的显示(设资源ID为IDB——BITMAP1程序如下) { CBitmap bitmap; CBitmap* pOldBitmap; CDC MemDC; MemDC.CreateCompatibleDC(&dc); ///建立与显示设备兼容的内存设备场境 bitmap.LoadBitmap(IDB_BITMAP1); ///取出位图资源 pOldBitmap=MemDC.SelectObject(&bitmap); ///将位图选入内存场境 dc.BitBlt(50,50,48,48,&MemDC,0,0,SRCCOPY); ///显示它 MemDC.SelectObject(pOldBitmap); }
二、创建位图,然后在里面画上图形,再显示它 { CBitmap bitmap; CBitmap* pOldBitmap; CDC MemDC; int i; CPen pen; CPen* oldpen; MemDC.CreateCompatibleDC(&dc); ///建立与显示设备兼容的内存设备场境 bitmap.CreateCompatibleBitmap(&dc,100,100);///建立与显示设备兼容的位图 pOldBitmap=MemDC.SelectObject(&bitmap); ///将位图选入内存场境 for(i=0;i<100;i++) { ///画100根线 pen.CreatePen(PS_SOLID,1, RGB(0,0,i*2+55)); oldpen=MemDC.SelectObject(&pen); MemDC.MoveTo(0,i); MemDC.LineTo(100,i); MemDC.SelectObject(oldpen); pen.DeleteObject(); } dc.BitBlt(50,50,100,100,&MemDC,0,0,SRCCOPY); ///显示它 MemDC.SelectObject(pOldBitmap); }
三、显示磁盘上的外部BMP文件 { HBITMAP bitmap; /////读取位图文件SAMPLE.BMP bitmap=(HBITMAP)LoadImage(AfxGetInstanceHandle(),"SAMPLE.BMP",IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_CREATEDIBSECTION); ASSERT(bitmap); HBITMAP OldBitmap; CDC MemDC;CRect rect; MemDC.CreateCompatibleDC(&dc); GetClientRect(rect); OldBitmap=(HBITMAP)MemDC.SelectObject(bitmap); ///显示它 dc.BitBlt(20,20,rect.Width()-20,rect.Height()-20,&MemDC,0,0,SRCCOPY); MemDC.SelectObject(OldBitmap); }
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