WP7: take screenshot from application

问题:

How can i take screenshot from code?

回答1:

Check here, it seems its possible on the emulator.

回答2:

Taking a screenshot of your application from your application code is very simple using WriteableBitmap. Laurent Bugnion has a good write up here: http://geekswithblogs.net/lbugnion/archive/2010/12/28/taking-a-screenshot-from-within-a-silverlight-wp7-application.aspx

回答3:

Taking a screenshot from within a Silverlight #WP7 application.

public static void SaveToMediaLibrary(
FrameworkElement element, 
string title)
{
try
{
    var bmp = new WriteableBitmap(element, null);

    var ms = new MemoryStream();
    bmp.SaveJpeg(
        ms,
        (int)element.ActualWidth,
        (int)element.ActualHeight,
        0,
        100);
    ms.Seek(0, SeekOrigin.Begin);

    var lib = new MediaLibrary();
    var filePath = string.Format(title + ".jpg");
    lib.SavePicture(filePath, ms);

    MessageBox.Show(
        "Saved in your media library!",
        "Done",
        MessageBoxButton.OK);
}
catch
{
    MessageBox.Show(
        "There was an error. Please disconnect your phone from the computer before saving.",
        "Cannot save",
        MessageBoxButton.OK);
}}

回答4:

Here is how you can take a screenshot from your app, from within your page's code and saves it to the picture library of your phone. Note that this won't capture the SysTray or the AppBar:

WriteableBitmap w = new System.Windows.Media.Imaging.WriteableBitmap(this, null); // 'this' is your current page
WriteableBitmap w2 = new System.Windows.Media.Imaging.WriteableBitmap(480, 800);

// space for SysTray
for (int i = 0; i < 32; i++)
{
    for (int j = 0; j < 480; j++)
    {
        w2.Pixels[i * 480 + j] = -16777216; // black #ff000000
    }
}

// actual client area
for (int i = 32; i < 728; i++)
{
    for (int j = 0; j < 480; j++)
    {
        w2.Pixels[i * 480 + j] = w.Pixels[(i - 32) * 480 + j];
    }
}

// space for AppBar
for (int i = 728; i < 800; i++)
{
    for (int j = 0; j < 480; j++)
    {
        w2.Pixels[i * 480 + j] = -16777216; // black #ff000000
    }
}
MemoryStream ms = new MemoryStream();
w2.SaveJpeg(ms, 480, 800, 0, 100);
Microsoft.Xna.Framework.Media.MediaLibrary lib = new Microsoft.Xna.Framework.Media.MediaLibrary();
ms.Position = 0;
lib.SavePicture("screenshot", ms);

回答5:

You can't i'm afraid. If you want screenshots you need to do outside using something like the snipping tool.