My first Dialog Box code...

Code:

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#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;
}

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Builds but doesn't run (no output!) This is the example i got from net...

Help, docs
please show MSDN documents.

It is definitely the WinMain function that needs fixing. To confirm this add:

Code:

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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.

Quote:

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Originally Posted by sgh

Help, docs
please show MSDN documents.

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?????????????

hhh,
please try to like this again.

Code:

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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;
}

---

Never cast the address of a function unless you really, REALLY know what you're doing, and in 99% of the cases, it's WRONG.
It will mask compile errors due to passing an incompatible function address as argument.

Quote:

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Originally Posted by sgh

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;
}

---

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hWnd returns NULL!!!! no dialog window was created.... What's the possible problem here?

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