不规则对话框的实现 C++.doc

不规则对话框的实现 C+ / 在 OnInitDialog() 时初始化相关数据 HDC hdcs; HBITMAP pBitmap; CBitmap m_bmp; pBitmap = (HBITMAP)LoadImage(NULL,图片.bmp,IMAGE_BITMAP,0,0,LR_LOADFROMFILE); hdcs = CreateCompatibleDC(NULL); m_bmp.Attach( pBitmap ); BITMAP bm; m_bmp.GetBitmap(&bm); CRect rtWindow; GetWindowRect(&rtWindow); rtWindow.right = rtWindow.left+bm.bmWidth; rtWindow.bottom =rtWindow.top +bm.bmHeight; MoveWindow(&rtWindow); CClientDC dc(this); SetupRegion(&dc,m_bmp,RGB(191,194,114) ); / 最后在 OnPaint 的else 里面 CClientDC dc(this); CDC picDC; picDC.CreateCompatibleDC (&dc); CBitmap *pOldBmp; pOldBmp = picDC.SelectObject (&m_bmp); BITMAP bm; m_bmp.GetBitmap(&bm); dc.BitBlt (0,0,bm.bmWidth ,bm.bmHeight,&picDC,0,0,SRCCOPY); dc.SelectObject(pOldBmp); / 下面是主代码void CtextDemoDlg:SetupRegion(CDC *pDC, CBitmap &cBitmap, COLORREF TransColor) CDC memDC; /创建与传入DC兼容的临时DC memDC.CreateCompatibleDC(pDC); CBitmap *pOldMemBmp=NULL; /将位图选入临时DC pOldMemBmp=memDC.SelectObject(&cBitmap); CRgn wndRgn; /创建总的窗体区域，初始region为0 wndRgn.CreateRectRgn(0,0,0,0); BITMAP bit; cBitmap.GetBitmap (&bit);/取得位图参数，这里要用到位图的长和宽 int y; for(y=0;y=bit.bmHeight ;y+) CRgn rgnTemp; /保存临时region int iX = 0; do /跳过透明色找到下一个非透明色的点. while (iX = bit.bmWidth & memDC.GetPixel(iX, y) = TransColor) iX+; /记住这个起始点 int iLeftX = iX; /寻找下个透明色的点 while (iX = bit.bmWidth & memDC.GetPixel(iX, y) != TransColor) +iX; /创建一个包含起点与重点间高为1像素的临时“region” rgnTemp.CreateRectRgn(iLeftX, y, iX, y+1); /合并到主region. wndRgn.CombineRgn(&wndRgn, &rgnTemp, RGN_OR); /删除临时region,否则下次创建时和出错 rgnTemp.DeleteObject(); whi