Solved

Out of memory error on call to Graphics.FromHdcInternal

Posted on 2006-06-29
7
838 Views
Last Modified: 2012-08-13
I'm working on an application that is passed an HDC from a COM method (the HDC is passed in as a 32-bit long integer.  When I call the static method Graphics.FromHdcInternal method while debugging I get an out of memory error thrown (this works fine when running compiled code).  I'm using C# with .net 2.0 (I found there was a bug in .net 1.1 but I assume they fixed it for 2.0).  Has anyone seen this and do they know a way around it?  Is there some setting I need to change?  

SSB
0
Comment
Question by:SideShowBob233
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
7 Comments
 
LVL 48

Expert Comment

by:AlexFM
ID: 17015708
Please show your code.
BTW, why don't you use Graphics.FromHdc?
0
 

Author Comment

by:SideShowBob233
ID: 17018582
It's fairly complex code I don't want to post....but here's a simplified summary (after making the change to use FromHdc -- I'm not very familiar with the graphics classes and I chose the wrong function -- the docs say not to call FromHdcInteral) -- but when I change to FromHdc I get the same error.  As a note the HDC passed in is from a different process (I'm making a call into an out of process ActiveX EXE in VB which is calling my C# class via COM interop).  Is it not possible to use the HDC
from another process (and maybe that's the problem)?  

[ComVisible(true)]
public void MyFunction(int HDC, bool reTry)
{
    Graphics g = Graphics.FromHdc((IntPtr)HDC); //<-- this triggers an out of memory error
}

0
 

Author Comment

by:SideShowBob233
ID: 17018638
It looks like the out of process component is the problem -- I did some googling and it looks like HDCs are not marshaled by COM so you can't use them.  Although if you can confirm this that would be great (or if you know of any way to work around this).

SSB
0
 
LVL 48

Accepted Solution

by:
AlexFM earned 500 total points
ID: 17018867
I don't think that it is possible to pass HDC between processes. Try HWND and Graphics.FromHwnd.
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Extention Methods in C# 3.0 by Ivo Stoykov C# 3.0 offers extension methods. They allow extending existing classes without changing the class's source code or relying on inheritance. These are static methods invoked as instance method. This…
Introduction This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
Suggested Courses

626 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question