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WebBrowser AccessViolationException

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悬赏园豆:20 [待解决问题]

我有一个程序,主要功能是通过UDP侦听接收远程发送的消息,根据协议在WebBrowser中打开一个指定的URL。

目前基本的网页都是可以正常使用的,可是在打开某个三维GIS网页时,程序会发生异常并崩溃,但偶尔又可以正常的访问,此网页通过WebBrowser打开时占用内存较多,根据观察最多可能会占用600-800MB内存。

 

异常堆栈

1 System.AccessViolationException: 尝试读取或写入受保护的内存。这通常指示其他内存已损坏。
2    在 System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
3    在 System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
4    在 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
5    在 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
6    在 System.Windows.Forms.Application.Run(Form mainForm)
7    在 XTXK.DTKZ.PCController.Client.Program.Main()

 

UDP接收消息

 1     this.thread = new Thread(() =>
 2                 {
 3                     while (this.Status)
 4                     {
 5                         Thread.Sleep(1);
 6 
 7                         if (this.udp == null) break;
 8                         if (this.udp.Available <= 0) continue;
 9 
10                         byte[] receiveBytes = this.udp.Receive(ref RemoteIpEndPoint);
11 
12                         if (Received != null)
13                             Received(RemoteIpEndPoint.Address, Encoding.Default.GetString(receiveBytes));
14                     }
15                 });
16                 this.thread.IsBackground = true;
17                 this.thread.Start();

 

处理请求

 1             try
 2             {
 3                 FormBrowser currentFormBrowser = null;
 4 
 5                 //遍历已打开的窗体中是否存在该资源的显示窗体
 6                 //如果存在则说明这是一次重复调用  直接显示此窗体即可
 7                 foreach (Form form in Application.OpenForms)
 8                 {
 9                     if (form is FormBrowser)
10                     {
11                         FormBrowser formBrowser = form as FormBrowser;
12 
13                         if (formBrowser.Resource.Number.Equals(resource.Number))
14                         {
15                             currentFormBrowser = formBrowser;
16                         }
17                     }
18                 }
19 
20                 if (currentFormBrowser == null)
21                 {
22                     //如果不存在 说明这是一次新的请求  需要找到请求的显示通道中当前的窗体并结束
23                     for (int i = 0; i < Application.OpenForms.Count; i++)
24                     {
25                         Form form = Application.OpenForms[i];
26                         if (form is FormBrowser)
27                         {
28                             FormBrowser formBrowser = form as FormBrowser;
29 
30                             if (formBrowser.Resource.ScreenChannelString.Equals(resource.ScreenChannelString))
31                             {
32                                 formBrowser.Close();
33                             }
34                         }
35                     }
36 
37                     currentFormBrowser = new FormBrowser();
38                 }
39 
40                 currentFormBrowser.Show(resource);
41             }
42             catch (Exception ex)
43             {
44                 Log.Exception(ex);
45             }

 

打开资源

 1     public FormBrowser()
 2         {
 3             InitializeComponent();
 4         }
 5 
 6 
 7         private void FormBrowser_Load(object sender, EventArgs e)
 8         {
 9             this.browser.ScriptErrorsSuppressed = true;
10         }
11 
12         public ResourceEntity Resource
13         {
14             get
15             {
16                 return this.resource;
17             }
18         }
19 
20         private void FormBrowser_FormClosing(object sender, FormClosingEventArgs e)
21         {
22             if (this.browser != null && !this.browser.IsDisposed)
23             {
24                 this.browser.Dispose();
25             }
26         }
27 
28         private void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
29         {
30             ((WebBrowser)sender).Document.Window.Error += Window_Error;
31         }
32 
33         private void Window_Error(object sender, HtmlElementErrorEventArgs e)
34         {
35             e.Handled = true;
36         }
37 
38         public void Show(ResourceEntity resource)
39         {
40             try
41             {
42                 this.BeginInvoke(new MethodInvoker(() =>
43                 {
44 
45                     if (this.resource != null)
46                     {
47 
48                             this.browser.Navigate(this.resource.Path);
49                             this.Show();
50                     }
51 
52                 }));
53 
54             }
55             catch (Exception ex)
56             {
57                 Log.Exception(ex);
58             }
59         }
莫香邪。的主页 莫香邪。 | 初学一级 | 园豆:139
提问于:2015-07-05 23:55
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