[Mono-dev] An generic error occurred in GDI +

[Sebastien Pouliot]

Hey,

On Fri, 2008-05-09 at 09:33 +0530, Umesh Chape wrote:
> Hi , 
>         I am using MonoTorrent.dll 0.0.0.0 .  on Operating system is
> Windows Xp  with sp2.      

It's difficult to help you without more information. E.g. are you using
the Mono runtime or MS runtime ?

> I got error like this " An generic error occurred in GDI +" . I got
> this error in method UpdateNotifyIcon(). 

A full stack trace, with line numbers, would be helpful.

> This error got after some hours during downloading. 
> 
> The methos is like this ,
> 
> 
> public void UpdateNotifyIcon()
>         {
> 
>             try
>             {
>                 if (this.MainBt.WindowState ==
> FormWindowState.Minimized)
>                 {
>                     int iconInt =16;
>                     double dl = clientEngine.TotalDownloadSpeed;
>                     double ul = clientEngine.TotalUploadSpeed;
>                     if (dl == 0 && ul == 0)
>                     {
>                         // No acivity: show grey mono icon
>                         this.MainBt.NotifyIconSystray.Icon =
> ResourceHandler.GetIcon("mono_grey", iconInt, iconInt);
>                     }
>                     else
>                     {
>                         // Build a system tray icon with downloadspeed
> indication
>                         if (maxDownload == 0)
>                         {
>                             maxDownload =
> clientEngine.Settings.GlobalMaxDownloadSpeed;
>                             // With a minimimum of 16 Kb (1 Kb per
> pixel)
>                             maxDownload = 1024 * 16;
>                         }
>                         if (maxDownload < dl)
>                             // If no MaxDownloadSpeed is given, create
> your own temporarily
>                             maxDownload = (int)(dl * 1.25);
> 
>                         // Calculate the dimensions and position of
> the progress indicator
>                         int h = (int)(dl / (maxDownload / iconInt));
>                         int w = 3;
>                         int x = iconInt - w;
>                         int y = iconInt - h;
> 
>                         
>                         Bitmap bmp = new Bitmap(iconInt,
> iconInt);                   
> 
>                         Graphics grs = Graphics.FromImage(bmp);
>                         grs.DrawIcon(mono, 0, 0);
>                         grs.FillRectangle(Brushes.Green, x, y, w, h);
>                         Icon sysIcon =
> Icon.FromHandle(bmp.GetHicon());

At this point 'bmp' is out of scope and the GC is free to collect it
whenever it wishes. I don't recall if the handle returned by GetHicon is
still valid after the bitmap (or it's graphics) has been collected. If
it's not (valid) then this is likely your problem.

>                         this.MainBt.NotifyIconSystray.Icon = sysIcon;
>                     }
> 
>                     // Show info text when hovering over system tray
> icon
>                     string niTxt = Application.ProductName + " " +
> Application.ProductVersion
>                                    + "\nDown: " +
> FormatSpeedValue(dl).ToString()
>                                  + " | Up: " +
> FormatSpeedValue(ul).ToString();
> 
>                     this.MainBt.NotifyIconSystray.Text = niTxt;
>                 }
>             }
>             catch (Exception)
>             {
>                
>                 throw;
>             }        
>             
>             
>           
>        }
>         
> -- 
> Regards,
> Umesh S.Chape
> +91 9422228738 
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