在Metro C#应用程序中捕获屏幕,可以使用Windows的API函数。以下是一个简单的示例代码,用于捕获整个屏幕并将其保存为PNG格式的图像文件:
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
public class ScreenCapture
{
[DllImport("user32.dll")]
private static extern IntPtr GetDesktopWindow();
[DllImport("user32.dll")]
private static extern IntPtr GetWindowDC(IntPtr hWnd);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateCompatibleDC(IntPtr hdc);
[DllImport("gdi32.dll")]
private static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);
[DllImport("gdi32.dll")]
private static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop);
[DllImport("gdi32.dll")]
private static extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]
private static extern bool DeleteDC(IntPtr hdc);
[DllImport("user32.dll")]
private static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
public static Bitmap CaptureScreen()
{
IntPtr hdc = GetWindowDC(GetDesktopWindow());
int width = Screen.PrimaryScreen.Bounds.Width;
int height = Screen.PrimaryScreen.Bounds.Height;
IntPtr compatibleDeviceContext = CreateCompatibleDC(hdc);
IntPtr compatibleBitmap = CreateCompatibleBitmap(hdc, width, height);
IntPtr oldBitmap = SelectObject(compatibleDeviceContext, compatibleBitmap);
BitBlt(compatibleDeviceContext, 0, 0, width, height, hdc, 0, 0, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
Bitmap bitmap = Image.FromHbitmap(compatibleBitmap);
SelectObject(compatibleDeviceContext, oldBitmap);
DeleteObject(compatibleBitmap);
DeleteDC(compatibleDeviceContext);
ReleaseDC(GetDesktopWindow(), hdc);
return bitmap;
}
}
在上面的代码中,我们使用了Windows API函数来捕获屏幕,并将其保存为Bitmap格式的图像。在Metro C#应用程序中,可以使用以下代码来保存Bitmap格式的图像为PNG格式的文件:
private void SaveBitmapAsPng(Bitmap bitmap, string filePath)
{
ImageCodecInfo imageCodecInfo = GetEncoderInfo("image/png");
EncoderParameters encoderParameters = new EncoderParameters(1);
encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
bitmap.Save(filePath, imageCodecInfo, encoderParameters);
}
private ImageCodecInfo GetEncoderInfo(string mimeType)
{
ImageCodecInfo[] imageCodecInfos = ImageCodecInfo.GetImageEncoders();
for (int i = 0; i< imageCodecInfos.Length; i++)
{
if (imageCodecInfos[i].MimeType == mimeType)
{
return imageCodecInfos[i];
}
}
return null;
}
在上面的代码中,我们使用了ImageCodecInfo类来获取PNG格式的编码器信息,并使用EncoderParameters类来设置编码器的参数。最后,我们使用Bitmap类的Save方法来将Bitmap格式的图像保存为PNG格式的文件。
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