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我用jqplot做了一个图形报表,要求要保存图片,所以用WebBrowser截图。在我自己电脑(xp sp3,IIS5.1)使用正常,可以保存图片;但是放到服务器(window server 2008 R2 standard,IIS6.1 )上就不行了,图片可以出来,但是白的,什么都没有。在网上找了好久,都没找出原因,飞哥,求救!
WebBrowser类如下
public class WebSiteThumbnail
{
public WebSiteThumbnail()
{
//
// TODO: Add constructor logic here
//
}
Bitmap m_Bitmap;
string m_Url;
int m_BrowserWidth, m_BrowserHeight, m_ThumbnailWidth, m_ThumbnailHeight;
public WebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)
{
m_Url = Url;
m_BrowserHeight = BrowserHeight;
m_BrowserWidth = BrowserWidth;
m_ThumbnailWidth = ThumbnailWidth;
m_ThumbnailHeight = ThumbnailHeight;
}
public static Bitmap GetWebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)
{
WebSiteThumbnail thumbnailGenerator = new WebSiteThumbnail(Url, BrowserWidth, BrowserHeight, ThumbnailWidth, ThumbnailHeight);
return thumbnailGenerator.GenerateWebSiteThumbnailImage();
}
public Bitmap GenerateWebSiteThumbnailImage()
{
Thread m_thread = new Thread(new ThreadStart(_GenerateWebSiteThumbnailImage));
m_thread.SetApartmentState(ApartmentState.STA);
m_thread.Start();
m_thread.Join();
//_GenerateWebSiteThumbnailImage();
return m_Bitmap;
}
private void _GenerateWebSiteThumbnailImage()
{
WebBrowser m_WebBrowser = new WebBrowser();
m_WebBrowser.ScrollBarsEnabled = false;
m_WebBrowser.Navigate(m_Url);
m_WebBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(WebBrowser_DocumentCompleted);
while (m_WebBrowser.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
}
m_WebBrowser.Dispose();
}
private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser m_WebBrowser = (WebBrowser)sender;
//m_WebBrowser.Document.InvokeScript("ShowImage");
m_WebBrowser.ClientSize = new Size(this.m_BrowserWidth, this.m_BrowserHeight);
m_WebBrowser.ScrollBarsEnabled = false;
m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width, m_WebBrowser.Bounds.Height);
m_WebBrowser.BringToFront();
m_WebBrowser.DrawToBitmap(m_Bitmap, m_WebBrowser.Bounds);
m_Bitmap = (Bitmap)m_Bitmap.GetThumbnailImage(m_ThumbnailWidth, m_ThumbnailHeight, null, IntPtr.Zero);
}
}
调用
Bitmap m_Bitmap = WebSiteThumbnail.GetWebSiteThumbnail(url, 1200, 650, 1200, 650);
MemoryStream ms = new MemoryStream();
m_Bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);//JPG、GIF、PNG等均可
System.Drawing.Image postImage = System.Drawing.Image.FromStream(ms);
postImage.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg);
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