捕获隐藏或最小化的窗口 [英] Capturing a Window that is hidden or minimized

问题描述

我遵循了这个教程(比此处列出的要多一些，因为在我的代码中，我通过鼠标单击获得了一个窗口)用于将窗口作为位图抓取，然后在不同的窗口中呈现该位图.

I followed this tutorial (there's a bit more than what's listed here because in my code I get a window via mouse click) for grabbing a window as a bitmap and then rendering that bitmap in a different window.

我的问题:

当该窗口最小化或隐藏 (SW_HIDE) 时，我的屏幕截图不起作用，那么是否可以在窗口最小化或隐藏时捕获该窗口?

When that window is minimized or hidden (SW_HIDE) my screen capture doesn't work, so is it possible to capture a window when it is minimized or hidden?

推荐答案

PrintWindow api 运行良好，我用它来捕获隐藏窗口的缩略图.尽管名称不同，但它与 WM_PRINT 和 WM_PRINTCLIENT 不同，它适用于除 Direct X/WPF 窗口之外的几乎所有窗口.

The PrintWindow api works well, I use it for capturing thumbnails for hidden windows. Despite the name, it is different than WM_PRINT and WM_PRINTCLIENT, it works with pretty much every window except for Direct X / WPF windows.

我添加了一些代码 (C#)，但在查看我如何使用代码后，我意识到当我捕获它的位图时窗口实际上并没有隐藏，它只是在屏幕外，所以这可能不适用于您的情况.你能在屏幕外显示窗口，打印一下然后再隐藏它吗?

I added some code (C#) but after reviewing how I used the code, I realized that the window isn't actually hidden when I capture its bitmap, its just off screen so this may not work for your case. Could you show the window off screen, do a print and then hide it again?

        public static Bitmap PrintWindow(IntPtr hwnd)
    {
        RECT rc;
        WinUserApi.GetWindowRect(hwnd, out rc);

        Bitmap bmp = new Bitmap(rc.Width, rc.Height, PixelFormat.Format32bppArgb);
        Graphics gfxBmp = Graphics.FromImage(bmp);
        IntPtr hdcBitmap = gfxBmp.GetHdc();
        bool succeeded = WinUserApi.PrintWindow(hwnd, hdcBitmap, 0);
        gfxBmp.ReleaseHdc(hdcBitmap);
        if (!succeeded)
        {
            gfxBmp.FillRectangle(new SolidBrush(Color.Gray), new Rectangle(Point.Empty, bmp.Size));
        }
        IntPtr hRgn = WinGdiApi.CreateRectRgn(0, 0, 0, 0);
        WinUserApi.GetWindowRgn(hwnd, hRgn);
        Region region = Region.FromHrgn(hRgn);
        if (!region.IsEmpty(gfxBmp))
        {
            gfxBmp.ExcludeClip(region);
            gfxBmp.Clear(Color.Transparent);
        }
        gfxBmp.Dispose();
        return bmp;
    }

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