捕获包含 BaloonTip 的屏幕截图答案

【问题标题】：Capture screenshot that includes BaloonTip捕获包含 BaloonTip 的屏幕截图
【发布时间】：2017-10-08 19:18:46
【问题描述】：

我想自动创建使用我的气球提示从通知图标截取的屏幕截图，以便可以轻松验证我的应用程序支持的不同语言的外观。问题是虽然在 Windows 7 上显示在屏幕上，但屏幕截图中没有气球提示。

我已经尝试过Capture screenshot of active window? 的解决方案，例如

// From http://www.developerfusion.com/code/4630/capture-a-screen-shot/
var sc = new ScreenCapture();
trayIcon.ShowBalloonTip(10000, "My Title", "My message", ToolTipIcon.Info);
Thread.Sleep(2000); // Just to make sure that the balloon tip is shown
sc.CaptureScreenToFile("MyScreenshot.png", ImageFormat.Png);

和

Rectangle bounds = Screen.GetBounds(Point.Empty);
using(Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height))
{
    using(Graphics g = Graphics.FromImage(bitmap))
    {
        trayIcon.ShowBalloonTip(10000, "My Title", "My message", ToolTipIcon.Info);
        Thread.Sleep(2000); // Just to make sure that the balloon tip is shown
        g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
    }
    bitmap.Save("MyScreenshot.png", ImageFormat.Png);
}

但两者都在不显示气球提示的情况下截取屏幕截图。那么，有没有办法以编程方式截取包含气球提示的屏幕截图？

奖励信息：在 Windows 10 上，气球提示被强制进入正常的通知系统，并按预期截屏。

【问题讨论】：

您需要添加 CopyPixelOperation.CaptureBlt 以便您还可以捕获分层窗口。
@HansPassant 成功了！根据您的建议，我找到了解决我问题的答案stackoverflow.com/questions/3072349/…。

标签： c# screenshot

【解决方案1】：

正如 Hans Passant 在对该问题的评论中提到的那样，使用CopyPixelOperation.CaptureBlt 是解决问题的关键。

由于它不适用于我已经尝试过的解决方案，我发现了一个类似的问题 Capture screenshot Including Semitransparent windows in .NET，它涉及半透明窗口。

总而言之，使我能够截取包含通知图标的气球提示的屏幕截图的解决方案如下所示：

class ScreenCapture
{
    public void CaptureScreenToFile(string fileName)
    {
        Size sz = Screen.PrimaryScreen.Bounds.Size;
        IntPtr hDesk = GetDesktopWindow();
        IntPtr hSrce = GetWindowDC(hDesk);
        IntPtr hDest = CreateCompatibleDC(hSrce);
        IntPtr hBmp = CreateCompatibleBitmap(hSrce, sz.Width, sz.Height);
        IntPtr hOldBmp = SelectObject(hDest, hBmp);
        bool b = BitBlt(hDest, 0, 0, sz.Width, sz.Height, hSrce, 0, 0, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
        Bitmap bmp = Bitmap.FromHbitmap(hBmp);
        SelectObject(hDest, hOldBmp);
        DeleteObject(hBmp);
        DeleteDC(hDest);
        ReleaseDC(hDesk, hSrce);
        bmp.Save(fileName);
        bmp.Dispose();
    }

    // P/Invoke declarations
    [DllImport("gdi32.dll")]
    static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int
        wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop);
    [DllImport("user32.dll")]
    static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDc);
    [DllImport("gdi32.dll")]
    static extern IntPtr DeleteDC(IntPtr hDc);
    [DllImport("gdi32.dll")]
    static extern IntPtr DeleteObject(IntPtr hDc);
    [DllImport("gdi32.dll")]
    static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);
    [DllImport("gdi32.dll")]
    static extern IntPtr CreateCompatibleDC(IntPtr hdc);
    [DllImport("gdi32.dll")]
    static extern IntPtr SelectObject(IntPtr hdc, IntPtr bmp);
    [DllImport("user32.dll")]
    public static extern IntPtr GetDesktopWindow();
    [DllImport("user32.dll")]
    public static extern IntPtr GetWindowDC(IntPtr ptr);
}

【讨论】：