Dialogbox class

[Nobody/Anonymous]

Not exactly DevC specific, but...
I would be happy to see a dialog class encapsulating the usual dialog stuff. I've seen some, but none of them could encapsulate that ugly callback function. I know it can be done with a static callback member passing a pointer to 'this', but cannot make it work properly as a base class to derive from.

thanks
rpeter

[Nobody/Anonymous]

Nevermind, a new day, a better day. Started again from scratch and it works now.

rpeter

[Nobody/Anonymous]

post it please

[Nobody/Anonymous]

cform.h:
#ifndef CFORM_H
#define CFORM_H
#include <windows.h>

class CForm
{
protected:
    HINSTANCE    hInst;
    int nDiaTemplate;
    virtual BOOL OnClose(HWND hwnd);
    virtual BOOL OnInit(HWND hwnd);
    virtual BOOL OnCommand(HWND hwnd, WPARAM wParam);
    LRESULT CALLBACK FormProc(HWND hwnd,UINT Message,WPARAM wParam,LPARAM lParam);
    static LRESULT CALLBACK DlgProc(HWND hwnd,UINT Message,WPARAM wParam,LPARAM lParam);
public:
    int RunForm(HWND hParent, HINSTANCE hInstance);
};

#endif //CFORM_H

cform.cpp:

#include <windows.h>
#include "cform.h"

BOOL CForm::OnClose(HWND hwnd)
{
    EndDialog(hwnd, 0);
    return TRUE;
}

BOOL CForm::OnInit(HWND hwnd)
{
    return TRUE;
}
BOOL CForm::OnCommand(HWND hwnd, WPARAM wParam)
{
    return TRUE;
}

LRESULT CALLBACK CForm::FormProc(HWND hwnd,UINT Message,WPARAM wParam,LPARAM lParam)
{
switch (Message)
{
    case WM_CLOSE:
        return OnClose(hwnd);
    case WM_COMMAND:
        return OnCommand(hwnd, wParam);
    case WM_INITDIALOG:
        return OnInit(hwnd);
    default:
        return FALSE;
}
}

LRESULT CALLBACK CForm::DlgProc(HWND hwnd,UINT Message,WPARAM wParam,LPARAM lParam)
{
CForm *instance;
if (Message == WM_INITDIALOG)
    SetWindowLong(hwnd, GWL_USERDATA, lParam);
instance = (CForm *)GetWindowLong(hwnd, GWL_USERDATA);
if (instance != NULL)
    return instance->FormProc(hwnd,Message,wParam,lParam);
}

int CForm::RunForm(HWND hParent, HINSTANCE hInstance)
{
CForm * cInst;
cInst = this;
hInst=hInstance;
return DialogBoxParam(hInst,
          MAKEINTRESOURCE(nDiaTemplate),
          hParent,
          (DLGPROC)DlgProc, (LPARAM)cInst);
                     
}

Usage: when deriving a new dialog box override the OnCommand member, also any member you need. Create a new constructor, which sets nDiaTemplate to the resource identifier. That's it.

I didn't bother to handle every dialog box message as you can see.

[Nobody/Anonymous]

Thanks.  I've been struggling with this for a bit.