Solved

Urgent help needed - handle to application window

Posted on 1998-11-30
4
203 Views
Last Modified: 2013-11-20
Hi,

HELP!! I am new to MFC programming and I'm really struggling with what seems like a really simple problem.

Ok, I have created an application using AppWizard. I have now started adding functionality to the application (the app will control a TWAIN complient scanner, and perform some image processing techniques). The code that is supplied with the TWAIN SDK uses the handle to window value (hwnd). The problem I have is obtaining this value when using MFC. I have tried everything I can think of, and desperately need some help.

I have tried: CWnd m_hWnd - no luck. I can't get FindWindow to work either.

Any help would be greatly appreciated.
Thanks,
J.P.Bourne

0
Comment
Question by:jpbourne
  • 2
  • 2
4 Comments
 
LVL 3

Accepted Solution

by:
plaroche earned 50 total points
ID: 1325520
This all depends on what window will handle the driver's notifications.

From any CWnd derived class you get the handle to it with:

GetSafeHwnd();
0
 
LVL 3

Expert Comment

by:plaroche
ID: 1325521
Pleas take not that GetSafeHwnd will return a valid handle only after OnCreate for the base class has been called.
0
 

Author Comment

by:jpbourne
ID: 1325522
I can only see the following OnCreate statement in the entire project:

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
   :
}

Is this the correct place to insert the GetSafeHwnd() statement?

And BTW, your help really is appreciated.
JPB.
0
 

Author Comment

by:jpbourne
ID: 1325523
I tried what you suggested in the CMainFrame::OnCreate and it worked!

Thanks for your help plaroche.
JPB
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Need a Shell script to start a service checking the port 6 52
Unix / Linux grid computing 5 163
not able to insert into temp table 68 169
wordcount challenge 11 134
This is to be the first in a series of articles demonstrating the development of a complete windows based application using the MFC classes.  I’ll try to keep each article focused on one (or a couple) of the tasks that one may meet.   Introductio…
Introduction: The undo support, implementing a stack. Continuing from the eigth article about sudoku.   We need a mechanism to keep track of the digits entered so as to implement an undo mechanism.  This should be a ‘Last In First Out’ collec…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.

830 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