Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

creating a window with CWnd::CreateEx() problem

Posted on 2002-03-25
6
Medium Priority
?
2,859 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 300 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
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 
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: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

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

Introduction: Hints for the grid button.  Nested classes, templated collections.  Squash that darned bug! Continuing from the sixth article about sudoku.   Open the project in visual studio. First we will finish with the SUD_SETVALUE messa…
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
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.
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…

715 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