Solved

creating a window with CWnd::CreateEx() problem

Posted on 2002-03-25
6
2,762 Views
Last Modified: 2013-11-20
I derived a class called CAnimWnd from CWnd, registered the window with the call to AfxRegisterWndClass() and then tried to call CreateEx():

BOOL CAnimWnd::Create(const char* pszTitle,DWORD          dwStyle,  CWnd* pParent, int x, int y, int cx, int cy)
{
    const char* pszClassName
        = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW);

    return CWnd::CreateEx(0, pszClassName, pszTitle,  dwStyle, x, y, cx, cy, NULL, NULL);
}

somehow the CWnd::CreateEx() returns false, and the window is not created. For what reasons does the CreateEx() func. returns false?

Any comment is appreciated, working answer receives an A.
0
Comment
Question by:kushcu
[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
6 Comments
 
LVL 3

Expert Comment

by:GGRUNDY
ID: 6895306
In Debug mode set a break point (F9) on your call and step into the MFC source (F11) to get a better idea of what is going wrong. If you look your Debug output Trace window should also report the message
Warning: Window creation failed: GetLastError returns ???
Where ??? is a hex number you can lookup using the "Error lookup" utility.
0
 
LVL 3

Expert Comment

by:job_s
ID: 6895690
or simply U post the creation code we'l find out the problem.
0
 
LVL 23

Accepted Solution

by:
Roshan Davis earned 100 total points
ID: 6895842
I think u need to create a Pop up window right ?
Thats y u used CreateEx in Create Function...
So u need to change the window style to popup
Just like below


return CreateEx(WS_EX_TOOLWINDOW,
                         AfxRegisterWndClass(CS_DBLCLKS),
                         NULL,
                         WS_POPUPWINDOW|WS_BORDER|WS_OVERLAPPED,
                         x, y, cx, cy,
                         pParent,
                         NULL);

GOOD LUCK
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 2

Expert Comment

by:Lockias
ID: 6897834
I notice you pass the CWnd* pParent to your derived class Create function, but you do not pass this on to the CreateEx function.  Are you settings the WS_CHILD style while setting the parent to NULL?

~Lockias
0
 

Author Comment

by:kushcu
ID: 6904010
i'm kind of in my midterm period right now, i'll check your comments out when i have the time, thanks.
0
 

Author Comment

by:kushcu
ID: 7057555
I tried a diiferent approach to this question that works fine, and feel the need to transfer the points to someone..
Thanks for all your time.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering 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
Decoding 32 bit binary streams 6 59
Detect CR LF to each line 12 185
Hibernate methods 2 88
My project did see openJDK that I installed. What could be the problem 7 172
Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
Introduction: Database storage, where is the exe actually on the disc? Playing a game selected randomly (how to generate random numbers).  Error trapping with try..catch to help the code run even if something goes wrong. Continuing from the seve…
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.

739 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