My first Dialog Box code...

This is a discussion on My first Dialog Box code... within the Windows Programming forums, part of the Platform Specific Boards category; Code: #include <windows.h> #include "stdafx.h" #include "Dialog box.h" HWND hWnd; LRESULT CALLBACK DlgProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam); ...

  1. #1
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    My first Dialog Box code...

    Code:
    #include <windows.h>
    #include "stdafx.h"
    #include "Dialog box.h"
    
    HWND hWnd;
    LRESULT CALLBACK DlgProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
    
    INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    				   LPSTR lpCmdLine, int nCmdShow)
    {
    	DialogBox(hInstance, MAKEINTRESOURCE(IDD_DLGFIRST),
    	          hWnd, reinterpret_cast<DLGPROC>(DlgProc));
    
    	return FALSE;
    }
    
    LRESULT CALLBACK DlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam, LPARAM lParam)
    {
    	switch(Msg)
    	{
    	case WM_INITDIALOG:
    		return TRUE;
    
    	case WM_COMMAND:
    		switch(wParam)
    		{
    		case IDOK:
    			EndDialog(hWndDlg, 0);
    			return TRUE;
    		}
    		break;
    	}
    
    	return FALSE;
    }
    Builds but doesn't run (no output!) This is the example i got from net...

  2. #2
    sgh
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    Help, docs
    please show MSDN documents.

  3. #3
    HelpingYouHelpUsHelpUsAll
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    It is definitely the WinMain function that needs fixing. To confirm this add:
    Code:
    if(hwnd == NULL)
    {
    	MessageBox(NULL, "Window Creation Failed!", "Error!",
    		MB_ICONEXCLAMATION | MB_OK);
    	return 0;
    }
    above return FALSE, if it fails that means DialogBox has failed. Also you should set hwnd = DialogBox(...);
    This page from msdn explains how to use dialog boxes, that page alone doesn't supply the WinMain function required though. Also look up the DialogBox function to see if there are any examples on how to use it.
    long time no C; //seige
    You miss 100% of the people you don't C;
    Code:
    if (language != LANG_C && language != LANG_CPP)
        drown(language);

  4. #4
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    Unhappy

    Quote Originally Posted by sgh View Post
    Help, docs
    please show MSDN documents.
    ?????????????

  5. #5
    sgh
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    hhh,
    please try to like this again.
    Code:
    NT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    				   LPSTR lpCmdLine, int nCmdShow)
    {
     hWnd = CreateDialog(hInstance,  MAKEINTRESOURCE(IDD_DIALOG1), 
                             NULL, (DLGPROC) GoToProc);
    
       if (!hWnd)
       {
          return FALSE;
       }
    
       ShowWindow(hWnd, nCmdShow);
       UpdateWindow(hWnd);
    ...
    }
    
    BOOL CALLBACK GoToProc(HWND hwndDlg, UINT message, WPARAM wParam, LPARAM lParam) 
    { 
        BOOL fError; 
     
        switch (message) 
        { 
            case WM_INITDIALOG: 
                return TRUE; 
     
            case WM_COMMAND: 
                switch (LOWORD(wParam)) 
                { 
                    case IDOK: 
                        
                        // Notify the owner window to carry out the task. 
     
                        return TRUE; 
     
                    case IDCANCEL: 
                        DestroyWindow(hwndDlg); 
                        return TRUE; 
                } 
        } 
        return FALSE; 
    }

  6. #6
    C++まいる!Cをこわせ! Elysia's Avatar
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    Never cast the address of a function unless you really, REALLY know what you're doing, and in 99&#37; of the cases, it's WRONG.
    It will mask compile errors due to passing an incompatible function address as argument.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  7. #7
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    Quote Originally Posted by sgh View Post
    hhh,
    please try to like this again.
    Code:
    NT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    				   LPSTR lpCmdLine, int nCmdShow)
    {
     hWnd = CreateDialog(hInstance,  MAKEINTRESOURCE(IDD_DIALOG1), 
                             NULL, (DLGPROC) GoToProc);
    
       if (!hWnd)
       {
          return FALSE;
       }
    
       ShowWindow(hWnd, nCmdShow);
       UpdateWindow(hWnd);
    ...
    }
    
    BOOL CALLBACK GoToProc(HWND hwndDlg, UINT message, WPARAM wParam, LPARAM lParam) 
    { 
        BOOL fError; 
     
        switch (message) 
        { 
            case WM_INITDIALOG: 
                return TRUE; 
     
            case WM_COMMAND: 
                switch (LOWORD(wParam)) 
                { 
                    case IDOK: 
                        
                        // Notify the owner window to carry out the task. 
     
                        return TRUE; 
     
                    case IDCANCEL: 
                        DestroyWindow(hwndDlg); 
                        return TRUE; 
                } 
        } 
        return FALSE; 
    }
    hWnd returns NULL!!!! no dialog window was created.... What's the possible problem here?
    Last edited by csonx_p; 05-06-2008 at 05:48 AM.

  8. #8
    sgh
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    ?
    in debug mode, verify hInstance value.
    and did you create dialog(=IDD_DIALOG1) box in resource?
    try it again!!!

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