2010-02-23 32 views
15

如何以编程方式将URL作为输入来捕捉网页的屏幕?以编程方式对网页进行截图

这里是我到现在为止:

// 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(); 

但是,这是行不通的。它只给我一张白色的空白图片。我在这里错过了什么?

是否有任何其他方式我可以以编程方式获取网页的屏幕截图?

+0

昨天刚刚问了这个问题,虽然主要针对Perl。也许一些答案会帮助你,虽然显然会带你另一个方向。这里是[链接](http://stackoverflow.com/questions/2312852/how-can-i-take-screenshots-with-perl)。 – lundmark 2010-02-23 21:49:54

回答

2

您可以尝试调用本地PrintWindow函数。

+1

你能解释一下吗?请注意,我只是将网页的网址作为输入。 – Manish 2010-02-23 09:11:54

3

将浏览器控件绘制为位图有点不可靠。我认为只是在屏幕上擦窗户会更好。

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); 
} 
+3

这种方法在控制台应用程序中不起作用,对吧? – 2012-02-20 13:04:51

0

您也可以尝试P /从gdi32.dll调用BitBlt()。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); 

的的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);