C# 以编程方式截取网页截图
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Taking screenshot of a webpage programmatically
提问by Manish
How do take a sceenshot of a webpage programmatically given the URL as input?
给定 URL 作为输入，如何以编程方式拍摄网页的截图？
And here is what I have till now:
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();
But this is not working. It is only giving me a white blank picture. What am I missing here?
但这是行不通的。它只给我一张白色的空白图片。我在这里缺少什么？
Is there any other way I could get the screenshot of a web page programmatically?
有没有其他方法可以以编程方式获取网页的屏幕截图？
采纳答案by Manish
I searched and searched and searched and found it Webpage thumbnailer(a The Code Projectarticle).
回答by leppie
You can try calling the native PrintWindowfunction.
您可以尝试调用本机PrintWindow函数。
回答by Gabe
Drawing the browser control to a bitmap is somewhat unreliable. I think it would be better to just screenscrape your window.
将浏览器控件绘制到位图有点不可靠。我认为最好只对您的窗口进行屏幕抓取。
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),
bitmapSize);
bitmap.Save(filename);
}
回答by Simon Linder
You could also try P/Invoking BitBlt()from gdi32.dll. Try this code:
您也可以尝试BitBlt()从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);
The P/Invoke would be:
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);
