SmartCode Solutions Web Forum

Is it possible to replicate the VNC manager thumbnail feature using the activeX control?

Regards, Carl Gilbert

There are several ways how it could be implemented. But just to give you a rough idea about our implementation.
We use native Windows listview control to show the thumbnail items. To each listview item corresponds a hidden instance of ViewerX control.
For this case, when ViewerX is hidden you would want to initialize the following properties:

//since you just want to show a remote screen
vncCtrl.ViewOnly = true;

//no need to transfer clipboard either
vncCtrl.DisableClipboard = true;

//tells ViewerX not to paint the remote screen (ViewerX is hidden, so there is no need to paint it)
vncCtrl.ThumbnailMode = true;

//allows ScreenUpdatedEvent to be fired for each screen update. By default this event is disabled for performance reasons
vncCtrl.AdvancedSettings.EnableScreenUpdatedEvent = true;

So we subscribe to ScreenUpdatedEvent and update an ImageList associated with thumbnails listview control for each screen update. Although in reality it's a bit more complicated than that.

Last but not least, here is how you could get access to the screen bitmap (C# code):
using (Bitmap bmp = Bitmap.FromHbitmap(new IntPtr(vncCtrl.ScreenBitmap)))
{
     //do something with bmp
}

I hope this helps.


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Kindest Regards,
SmartCode Solutions Support

using (Bitmap bmp = Bitmap.FromHbitmap(new IntPtr(vncCtrl.ScreenBitmap)))

Thank you!

Tim