如何将我的 Bing 地图图像的屏幕截图复制到 Winforms 中的剪贴板？

Question

在我的 winforms 应用程序中，我希望允许用户将 Bing 地图组件的屏幕截图复制到剪贴板（至少）。

我从 here 中找到了以下代码，它超出了这个范围，但它没有为我编译。

SaveScreenshot(this.userControl11.myMap, "MapScreenshot.png"); // code in menu item click handler

private async void SaveScreenshot(FrameworkElement captureSource, string suggestedName)
{
    //Create a FileSavePicker.
    var savePicker = new Windows.Storage.Pickers.FileSavePicker()
    {
        DefaultFileExtension = ".png",
        SuggestedFileName = suggestedName,
        SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary
    };

    savePicker.FileTypeChoices.Add(".png", new System.Collections.Generic.List<string> { ".png" });

    //Prompt the user to select a file.
    var saveFile = await savePicker.PickSaveFileAsync();

    //Verify the user selected a file.
    if (saveFile != null)
    {                
        using (var fileStream = await saveFile.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite))
        {
            //Capture the screenshot and save it to the file stream.
            await ScreenshotToStreamAsync(captureSource, fileStream);
        }
    }
}

private async Task ScreenshotToStreamAsync(FrameworkElement element, IRandomAccessStream stream)
{
    var renderTargetBitmap = new Windows.UI.Xaml.Media.Imaging.RenderTargetBitmap();
    await renderTargetBitmap.RenderAsync(element);

    var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();

    var dpi = Windows.Graphics.Display.DisplayInformation.GetForCurrentView().LogicalDpi;

    var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
    encoder.SetPixelData(
        BitmapPixelFormat.Bgra8,
        BitmapAlphaMode.Ignore,
        (uint)renderTargetBitmap.PixelWidth,
        (uint)renderTargetBitmap.PixelHeight,
        dpi,
        dpi,
        pixelBuffer.ToArray());

    await encoder.FlushAsync();
}

我得到的编译时错误消息是关于 IRandomAccessStream:

1>C:\Users\bclay\source\repos\MyMaps\MyMaps\Form1.cs(394,78,394,97): error CS0246: The type or namespace name 'IRandomAccessStream' could not be found (are you missing a using directive or an assembly reference?)

所以我找到了this，说明我需要的“using”是using Windows.Storage.Streams;

...但是当我添加它时，我被告知找不到“Windows”命名空间：

1>C:\Users\bclay\source\repos\MyMaps\MyMaps\Form1.cs(8,7,8,14): error CS0246: The type or namespace name 'Windows' could not be found (are you missing a using directive or an assembly reference?)

我需要 do/change/add 什么才能让它在 Winforms 上运行？还是我的情况需要完全不同的方法？

Answer 1

有几种方法可以做到。

作为一个简单（但绝对不是完美）的选项，您可以使用 Graphics.FromScreen 将一块屏幕复制到图形对象：

var r = elementHost1.ClientRectangle;
using (var img = new Bitmap(r.Width, r.Height))
{
    using (var g = Graphics.FromImage(img))
    {
        var sr = elementHost1.RectangleToScreen(r);
        g.CopyFromScreen(sr.Location, System.Drawing.Point.Empty, sr.Size);
    }
    System.Windows.Forms.Clipboard.SetImage(img);
}

另一种选择是使用 RenderTargetBitmap and PngBitmapEncoder 将其导出为图像，如下所示：

public System.Drawing.Image DrawToImage(
    System.Windows.Controls.Control target)
{
    var rtb = new System.Windows.Media.Imaging.RenderTargetBitmap(
        (int)(target.ActualWidth), (int)(target.ActualHeight),
            96, 96, System.Windows.Media.PixelFormats.Pbgra32);
    rtb.Render(target);
    System.Windows.Media.Imaging.PngBitmapEncoder encoder =
        new System.Windows.Media.Imaging.PngBitmapEncoder();
    encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(rtb));
    var ms = new System.IO.MemoryStream();
    encoder.Save(ms);
    return System.Drawing.Image.FromStream(ms);
}

然后就可以设置到剪贴板了：

using (var image = DrawToImage(userControl11.myMap))
    System.Windows.Forms.Clipboard.SetImage(image);

或者保存到文件中：

using (var image = DrawToImage(userControl11.myMap))
    image.Save(@"c:\test\map.png", System.Drawing.Imaging.ImageFormat.Png);

如何将我的 Bing 地图图像的屏幕截图复制到 Winforms 中的剪贴板？

How can I copy a screenshot of my Bing Maps image to the Clipboard in Winforms?

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