学步园

//需要引用的头文件<br /> #include <wingdi.h><br /> #pragma comment(lib, "MSIMG32.LIB")</p> <p>//常量声明<br /> #define WS_EX_LAYERED 0x00080000<br /> #define LWA_COLORKEY 0x00000001<br /> #define LWA_ALPHA 0x00000002 </p> <p>//CreateWindowEx(WS_EX_LAYERED,...);//创建窗体</p> <p>BLENDFUNCTION bindfun;</p> <p>//设置AlphaBind的最后一个参数<br /> bindfun.BlendOp=AC_SRC_OVER;<br /> bindfun.BlendFlags=0;<br /> bindfun.SourceConstantAlpha=255;<br /> bindfun.AlphaFormat=AC_SRC_ALPHA;</p> <p>//以下三行为虚代码,具体实现请参考相关代码<br /> //HDC hmemdc=CreateMemDC(); //创建内存绘图设备句柄<br /> //CPng png;<br /> //png.Load("1.png");//加载png图片</p> <p>//在将ColorBits转换为DC前，先将每个像素进行下面的运算</p> <p>//R=BYTE(MulDiv(R,A,255));<br /> //G=BYTE(MulDiv(G,A,255));<br /> //B=BYTE(MulDiv(B,A,255));</p> <p>::AlphaBlend(hmemdc,0,0,260,60,png.GetDC(),0,0,260,60,bindfun);</p> <p>RECT crc,wrc;</p> <p>GetClientRect(hWnd,&crc);<br /> GetWindowRect(hWnd,&wrc);</p> <p>POINT ptWinPos={wrc.left,wrc.top};<br /> SIZE sizeWindow={crc.right, crc.bottom};<br /> POINT ptSrc={0,0};</p> <p>BOOL bResult=::UpdateLayeredWindow(hWnd, hWinhdc, &ptWinPos, &sizeWindow, hmemdc, &ptSrc, 0, &bindfun, ULW_ALPHA);

以下为效果图