MFC 做不规则对话框

 

根据图片颜色值来做不规则对话框

 

 

外圈红色部分会被透掉，效果如下：

 

 

 

所以这张图片就不会显示了，越简单越好

 

 

 

声明一个成员变量：CBitmap   m_bmpDraw; 

在OnInitDialog()加载图片：m_bmpDraw.LoadBitmap(IDB_BG_USERINFO);

 

//这个函数最好在OnInitDialog()调用，初始化执行一次就可以了

void CUserInfoControl::SetupRegion(CDC *pDC) 

{ 

        CDC                     memDC; 

        CBitmap                &cBitmap=m_bmpDraw; 

        CBitmap*              pOldMemBmp = NULL; 

        COLORREF          col,colMask; 

        CRect                    cRect; 

        int                        x, y; 

        CRgn                    wndRgn, rgnTemp; 

        GetWindowRect(&cRect); 

        CPoint ptOrg=cRect.TopLeft(); 

        BITMAP bmInfo; 

        cBitmap.GetObject(sizeof(bmInfo),&bmInfo); 

        CRect rcNewWnd=CRect(ptOrg,CSize(bmInfo.bmWidth,bmInfo.bmHeight)); 

        memDC.CreateCompatibleDC(pDC); 

        pOldMemBmp = memDC.SelectObject(&cBitmap); 

        colMask=memDC.GetPixel(0,0); 

        wndRgn.CreateRectRgn(0, 0, rcNewWnd.Width(), rcNewWnd.Height()); 

        for(x=0; x<=rcNewWnd.Width(); x++) 

        { 

               for(y=0; y<=rcNewWnd.Height(); y++) 

               { 

                      col = memDC.GetPixel(x, y); 

                      if(col == colMask) 

                      { 

                             rgnTemp.CreateRectRgn(x, y, x+1, y+1); 

                             wndRgn.CombineRgn(&wndRgn, &rgnTemp, RGN_XOR); 

                             rgnTemp.DeleteObject();       

                      } 

               } 

        } 

        memDC.SelectObject(pOldMemBmp); 
        SetWindowRgn((HRGN)wndRgn, TRUE); 

}

 

网易博客：http://shaojiang216.blog.163.com/blog/static/131325824201192252353405/