15

给定 URL 作为输入，如何以编程方式拍摄网页截图？

这是我到目前为止所拥有的：

// The size of the browser window when we want to take the screenshot (and the size of the resulting bitmap)
Bitmap bitmap = new Bitmap(1024, 768);
Rectangle bitmapRect = new Rectangle(0, 0, 1024, 768);
// This is a method of the WebBrowser control, and the most important part
webBrowser1.DrawToBitmap(bitmap, bitmapRect);

// Generate a thumbnail of the screenshot (optional)
System.Drawing.Image origImage = bitmap;
System.Drawing.Image origThumbnail = new Bitmap(120, 90, origImage.PixelFormat);

Graphics oGraphic = Graphics.FromImage(origThumbnail);
oGraphic.CompositingQuality = CompositingQuality.HighQuality;
oGraphic.SmoothingMode = SmoothingMode.HighQuality;
oGraphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
Rectangle oRectangle = new Rectangle(0, 0, 120, 90);
oGraphic.DrawImage(origImage, oRectangle);

// Save the file in PNG format
origThumbnail.Save(@"d:\Screenshot.png", ImageFormat.Png);
origImage.Dispose();

但这不起作用。它只给了我一张白色的空白图片。我在这里想念什么？

有没有其他方法可以以编程方式获取网页的屏幕截图？

4

4 回答 4

7

我搜索和搜索并找到它网页缩略图（代码项目文章）。

于 2010-02-23T10:30:50.190 回答
3

将浏览器控件绘制为位图有点不可靠。我认为最好只截屏你的窗口。

using (Bitmap bitmap = new Bitmap(bitmapSize.Width, bitmapSize.Height, PixelFormat.Format24bppRgb))
using (Graphics graphics = Graphics.FromImage(bitmap))
{
    graphics.CopyFromScreen(
        PointToScreen(webBrowser1.Location),
        new Point(0, 0), 
        bitmap.Size);
        bitmap.Save(filename);
}
于 2010-02-23T08:16:21.017 回答
2

您可以尝试调用本机PrintWindow函数。

于 2010-02-23T08:08:09.377 回答
0

您也可以尝试 P/Invoking BitBlt()from gdi32.dll。试试这个代码：

Graphics mygraphics = webBrowser1.CreateGraphics();
Size s = new Size(1024, 768);
Bitmap memoryImage = new Bitmap(s.Width, s.Height, mygraphics);
Graphics memoryGraphics = Graphics.FromImage(memoryImage);
IntPtr dc1 = mygraphics.GetHdc();
IntPtr dc2 = memoryGraphics.GetHdc();
// P/Invoke call here
BitBlt(dc2, 0, 0, webBrowser1.ClientRectangle.Width, webBrowser1.ClientRectangle.Height, dc1, 0, 0, 13369376);
mygraphics.ReleaseHdc(dc1);
memoryGraphics.ReleaseHdc(dc2);
memoryImage.Save(filename);

P/Invoke 将是：

[DllImport("gdi32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool BitBlt(IntPtr hdc, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, uint dwRop);
于 2010-02-23T08:18:46.267 回答