Solved

Urgent help needed - handle to application window

Posted on 1998-11-30
4
210 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
[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
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

Enroll in May's Course of the Month

May’s Course of the Month is now available! Experts Exchange’s Premium Members and Team Accounts have access to a complimentary course each month as part of their membership—an extra way to increase training and boost professional development.

Question has a verified solution.

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

Introduction: Dynamic window placements and drawing on a form, simple usage of windows registry as a storage place for information. Continuing from the first article about sudoku.  There we have designed the application and put a lot of user int…
Introduction: Finishing the grid – keyboard support for arrow keys to manoeuvre, entering the numbers.  The PreTranslateMessage function is to be used to intercept and respond to keyboard events. Continuing from the fourth article about sudoku. …
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.

738 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