Thread: Creating a window from a dialog box

  1. #1
    Registered User
    Join Date
    Feb 2010

    Creating a window from a dialog box

    Hi everyone,

    I have a program which has a dialog box as its main menu, and as such, my WinMain looks like this:

    int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
    return DialogBox(hInstance, MAKEINTRESOURCE(IDD_MAINMENU), NULL, MainDlgProc);
    This means that I don't have a message loop and I don't register any window classes. However, on my dialog box, I want to have a button which launches a window when pressed (not another dialog box) and of course this window requires a message loop. So, my question is: is it possible to create a window from a dialog box? Where should I put the message loop?


  2. #2
    Registered User
    Join Date
    Apr 2013
    Well, you probably don't want to return the value returned from DialogBox to main. From what I think, when you return from main you end the program. The return from main is the exit point of the program, the point of no return. Also, whatever value returned that is no 0, is probably seen as an error. The way I believe it can be done is just by creating window(s) like you would normally do, except you don't use ShowWindow. You only show the windows when you receive a command from the dialog.

  3. #3
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    The DialogBox macro uses the CreateWindowEx function to create the dialog box. DialogBox then sends a WM_INITDIALOG message (and a WM_SETFONT message if the template specifies the DS_SETFONT or DS_SHELLFONT style) to the dialog box procedure. The function displays the dialog box (regardless of whether the template specifies the WS_VISIBLE style), disables the owner window, and starts its own message loop to retrieve and dispatch messages for the dialog box.
    So if you do not want to relay on DialogBox internal message loop - You can call CreateWindowEx by yourself and then use your own custom message loop
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

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