半透效果实现_wy37.con

作者：中国嵌入式系统开发

实现两张图片叠加，半透明效果。

sdmmclogozx.bmp和sdmmclogohangsheng.bmp

void CGPS_eDogDlg::TransBitmap(HDC hDC,RECT rect,double Trans)
{     
    int nWidth   = rect.right - rect.left;                          //半透明区域的宽度
    int nHeight = rect.bottom - rect.top;                          //半透明区域的高度

HDC hBackDC;
hBackDC = CreateCompatibleDC(hDC);
HBITMAP hBackBitmap;
hBackBitmap = (HBITMAP)SHLoadDIBitmap(_T(sdmmclogozx.bmp));
SelectObject(hBackDC,hBackBitmap);

HBITMAP hUpBitmap;
HDC hUpDC;
hUpDC = CreateCompatibleDC(hDC);
hUpBitmap = (HBITMAP)SHLoadDIBitmap(_T(sdmmclogohangsheng.bmp));
SelectObject(hUpDC,hUpBitmap);
     
    //新建一个DC来拷贝目标区域
    HDC BackDC;                                                            
    BackDC = CreateCom