Creating a child window

This is a discussion on Creating a child window within the Windows Programming forums, part of the Platform Specific Boards category; Hello, I am trying to make a simple control, by creating a child window. I have already created another window ...

  1. #1
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    Aug 2006
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    Creating a child window

    Hello,

    I am trying to make a simple control, by creating a child window. I have already created another window successfully, who's handle is "h_parent". (My application instance is "h_instance".) I have then tried to create the child window, using the code below, but it does not work. The program freezes for a few seconds at the CreateWindowEx function, and then gives me an unhandled exception from the file <xutility>. Any ideas what I am doing wrong? Thanks.


    Code:
    HWND CreateControl(HWND h_parent, HINSTANCE h_instance)
    {
    DWORD extended_window_style = 0;
    LPCSTR window_class_name = "my_control";
    LPCSTR window_name = "";
    DWORD window_style = WS_CHILD | WS_VISIBLE;
    int x = 0;
    int y = 0;
    int width = 100;
    int height = 100;
    HWND parent_window_handle = h_parent;
    HMENU menu_handle = NULL;
    HINSTANCE app_instance_handle = h_instance;
    LPVOID window_creation_data = NULL;
    
    HWND h_control = CreateWindowEx(extended_window_style, window_class_name, window_name, window_style, x, y, width, height, parent_window_handle, menu_handle, app_instance_handle, window_creation_data);
    
    return h_control;
    }

  2. #2
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    You have to use the control's class name, and it's case sensitive... For an edit control your window_class_name would be "EDIT"

    But why are you doing it the hard way, you could simply do this...

    Code:
        // text display window
        Wind[1] = CreateWindowEx(WS_EX_CLIENTEDGE,L"STATIC",RM_VERSION,
                      WS_CHILD | WS_VISIBLE |
                      SS_CENTER | SS_CENTERIMAGE | SS_NOTIFY,
                      0,0,300,20,Wind[0],(HMENU)100,PgmInst,NULL);
    There's no reason to pass everything through intermediate variables, that's just a waste of space.

  3. #3
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    Hi,

    Thanks for the help. I understand that I need to use the control's class name - this is in fact exactly "my_control" which was used to register the class.

    I've figured out some more information that might help. If I set the window style to "0", then it runs fine. However, if either "WS_CHILD" or "WS_VISIBLE" are present, then the CreateWindowEx() does not work. ALl other window styles that I have tried seem to work fine. But I need WS_CHILD, because I want it to be a child window, so it is odd that it causes an error...

    Any ideas? Thanks.

  4. #4
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    Please post the code for the custom control... I suspect that's where your problem is...

    Also you really should clean up that subroutine you posted. Using intermediate variables like that is just plain silly.

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