Hi everyone,
I have a pesky little problem that is driving me nuts.
I'm trying to capture an image of a web page programmaticall y in a
background thread or process.
What I'd like to do is create a Bitmap object of a webpage from, say,
the new WebBrowser control of .net 2.0 or even the old ActiveX browser
control, without opening any forms.
I tried with the new WebBrowser control, but the only thing I've managed
to do is open up a form with the control in it, and do a screen capture
of a rectangle the same size of the control.
But the problem is that I need to do it /without/ opening the Form. :(
I think I'm getting close, but I really can't find a way to do it as a
background process.
Can anyone please point me in the right direction?
Thanks
--
Joe Black 3 2566
Interop and the PrintWindow API.
--
Bob Powell [MVP]
Visual C#, System.Drawing
Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm
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"Joe Black" <jo*@black.co m> wrote in message
news:DZ******** ***********@twi ster2.libero.it ... Hi everyone, I have a pesky little problem that is driving me nuts. I'm trying to capture an image of a web page programmaticall y in a background thread or process. What I'd like to do is create a Bitmap object of a webpage from, say, the new WebBrowser control of .net 2.0 or even the old ActiveX browser control, without opening any forms.
I tried with the new WebBrowser control, but the only thing I've managed to do is open up a form with the control in it, and do a screen capture of a rectangle the same size of the control. But the problem is that I need to do it /without/ opening the Form. :( I think I'm getting close, but I really can't find a way to do it as a background process.
Can anyone please point me in the right direction?
Thanks
-- Joe Black
Thanks for your reply,
I tried with PrintWindow API, but all I get is a black bitmap if try to
capture a control that is not visible.
Here is what i do:
[DllImport("user 32.dll")]
private static extern bool PrintWindow(Int Ptr hwnd, IntPtr hdcBlt, uint
nFlags);
//...
Bitmap bm = new Bitmap(webBrows er1.Width, this.webBrowser 1.Height);
Graphics g = Graphics.FromIm age(bm);
IntPtr hdc = g.GetHdc();
Form1.PrintWind ow(webBrowser1. Handle, hdc, 0);
g.ReleaseHdc(hd c);
g.Flush();
g.Dispose();
this.pictureBox 1.Image = bm;
//...
Am I missing something?
--
Joe Black
Bob Powell [MVP] wrote on 12/04/2005 19.38: Interop and the PrintWindow API.
On Tue, 12 Apr 2005 15:40:19 GMT, Joe Black <jo*@black.co m> wrote: Hi everyone, I have a pesky little problem that is driving me nuts. I'm trying to capture an image of a web page programmaticall y in a background thread or process. What I'd like to do is create a Bitmap object of a webpage from, say, the new WebBrowser control of .net 2.0 or even the old ActiveX browser control, without opening any forms.
I tried with the new WebBrowser control, but the only thing I've managed to do is open up a form with the control in it, and do a screen capture of a rectangle the same size of the control. But the problem is that I need to do it /without/ opening the Form. :( I think I'm getting close, but I really can't find a way to do it as a background process.
Can anyone please point me in the right direction?
Thanks
I have exactly the same requirement coming at me somewhere down the
road - if you find a solution please let us know.
Ive not given this very much thought myself yet but one idea might be
to use something like virtual print driver http://www.print-driver.com/... I REALLY dont know if a third party
component would be requied for this but just a thought.
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