[Mono-winforms-list] Graphics.FromHwnd(IntPtr.Zero) not working

[Stefano Del Furia]

Thanks to all.
Since this seems not possible, is thre a way of writeing directly on screen 
using another way ???
Thanks in advance.
Stefano
 

-----Original Message-----
From: Jonathan Chambers <joncham at gmail.com>
To: Stefano Del Furia <delfo at edudotnet.it>
Cc: Carlos Alberto Cortez <calberto.cortez at gmail.com>, 
mono-winforms-list at lists.ximian.com
Date: Wed, 10 Feb 2010 09:01:49 -0500
Subject: Re: [Mono-winforms-list] Graphics.FromHwnd(IntPtr.Zero) not working

Hello,
     It's been a while since I looked at Windows.Forms issues, but I don't 
think you can acquire a desktop graphics context on Linux (what windows does 
when you pass IntPtr.Zero).

Thanks,
Jonathan

On Wed, Feb 10, 2010 at 3:46 AM, Stefano Del Furia <delfo at edudotnet.it> 
wrote:
HI,
thaks for the reply but i don't know what you mean.
In Windows i can use the three lines of code below and all works fine.
Why i cannot do the same in Mono ??
If this line 
 
Graphics g = Graphics.FromHwnd(IntPtr.Zero);
 
create a Graphics object why i cannot use the Draw methods for drawing 
inside it ??
Thanks again.
Stefano
 

 
-----Original Message-----
From: Carlos Alberto Cortez <calberto.cortez at gmail.com>
To: Stefano Del Furia <delfo at edudotnet.it>
Cc: mono-winforms-list at lists.ximian.com
Date: Tue, 9 Feb 2010 23:24:23 +0100
Subject: Re: [Mono-winforms-list] Graphics.FromHwnd(IntPtr.Zero) not working

Hello,

This method is defined basically to retrieve available information in the 
Graphics instance, not to do actual draw work on the screen (this could be 
accomplished by a different way, but it would be system specific, as nothing 
like that appears in the winforms api).

Carlos.

2010/2/7 Stefano Del Furia <delfo at edudotnet.it>
Hi,
i'm using Graphics.FromHwnd(IntPtr.Zero) for drawing directly on screen but 
under Ubuntu 9.04 it don't work.
The method don't return a null value but when i try to draw some object like 
a a line nothing happened like in this way:
 
            Graphics g = Graphics.FromHwnd(IntPtr.Zero);
            Point pMousePos = new Point(e.X, e.Y);
            g.DrawLine(p, pMousePos, lastPoint);
 
What am i wrong ??
Thanks in advance.
Stefano

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