透明GIF图片显示控件

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透明窗体参见:

https://msdn.microsoft.com/en-us/library/ms997507.aspx

CreateWindowEx是需要设置属性

WS_EX_LAYERED | WS_EX_TRANSPARENT

这两个属性很重要.

绘制操作可以参照此函数做:

OnPaint函数中响应:

void GIFStatic::DrawPNG(HWND hWnd, HDC hdc, int width, int height){TCHAR *pngFile = L"C:\\Users\\dyh\\Desktop\\文档\\ico.ooopic.com.png";/*********************************************   step 1.*   Using Gdiplus to load the image********************************************/RECT wndRect;::GetWindowRect(hWnd, &wndRect);SIZE wndSize = { wndRect.right - wndRect.left, wndRect.bottom - wndRect.top };if (hdc == NULL) hdc = ::GetWindowDC(hWnd);HDC memDC = ::CreateCompatibleDC(hdc);HBITMAP memBitmap = ::CreateCompatibleBitmap(hdc, wndSize.cx, wndSize.cy);::SelectObject(memDC, memBitmap);Gdiplus::Image image(pngFile);Gdiplus::Graphics graphics(memDC);graphics.DrawImage(&image, 0, 0, wndSize.cx, wndSize.cy);// get screen dc HDC screenDC = hdc;POINT ptSrc = { 0, 0 };/**********************************************   step 3.*   Use UpdateLayeredWindow to Draw the Window**********************************************/BLENDFUNCTION blendFunction;blendFunction.AlphaFormat = AC_SRC_ALPHA;blendFunction.BlendFlags = 0;blendFunction.BlendOp = AC_SRC_OVER;blendFunction.SourceConstantAlpha = 255;UpdateLayeredWindow(hWnd, screenDC, &ptSrc, &wndSize, memDC, &ptSrc, 0, &blendFunction, 2);::DeleteDC(screenDC);::DeleteDC(memDC);::DeleteObject(memBitmap);}

完成此函数后需要使用MoveWindow函数将窗体移动回去.

否则窗体会移动至左上角落.

代码目录请见下面:

http://download.csdn.net/detail/ab7936573/9496109

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