How do I create a modeless dialog in a DLL?

Originally posted by: H
I have an MFC C++ dll, which is called from a C executable.
I can create a modal dialog just fine, but I'm having trouble getting a modeless dialog. So far it appears for juct a few milliseconds then goes. I suspect that this is because it's going on the stack instead of the heap.

Anyone out there know a simple answer? A chunk of code would be greatly appreciated as I'm new to all of this.

Thanks,

in the MFC Dll : one Dialog class :

(the dialog is not destroyed when it receives OnCancel or OnOK, it is oly hidden, the object itself is destroyed in OnPostNCDestroy, the last message received).

"Dlg.h"

#ifndef AFX_DLG_H_INCLUDED_ #define AFX_DLG_H_INCLUDED_ class CDlg : public CDialog { public: CDlg(); BOOL Create(CWnd* pParent = NULL); // Dialog Data //{{AFX_DATA(CDlg) enum { IDD = IDD_DIALOG }; //}}AFX_DATA // Overrides //{{AFX_VIRTUAL(CDlg) protected: virtual void DoDataExchange(CDataExchange* pDX); virtual void PostNcDestroy(); //}}AFX_VIRTUAL // Generated message map functions protected: //{{AFX_MSG(CDlg) virtual void OnCancel(); virtual void OnOK(); //}}AFX_MSG DECLARE_MESSAGE_MAP() }; #endif // AFX_DLG_H_INCLUDED_

"Dlg.cpp"

// Dlg.cpp : implementation file // #include "StdAfx.h" #include "TestDll.h" #include "Dlg.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif BEGIN_MESSAGE_MAP(CDlg, CDialog) //{{AFX_MSG_MAP(CDlg) //}}AFX_MSG_MAP END_MESSAGE_MAP() CDlg::CDlg() : CDialog() { //{{AFX_DATA_INIT(CDlg) //}}AFX_DATA_INIT } void CDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CDlg) //}}AFX_DATA_MAP } BOOL CDlg::Create(CWnd* pParent /*= NULL*/) { if(!CDialog::Create(CDlg::IDD, pParent))return FALSE; return TRUE; } void CDlg::OnCancel() { ShowWindow(SW_HIDE); } void CDlg::OnOK() { ShowWindow(SW_HIDE); } void CDlg::PostNcDestroy() { delete this; }

in the MFC Dll, on exported function (createDlg)

"ImpExp.h"

#ifndef IMPEXP_H #define IMPEXP_H #ifdef TESTDLL_EXPORTS #define TESTDLL_API extern "C" __declspec(dllexport) #else #define TESTDLL_API extern "C" __declspec(dllimport) #endif TESTDLL_API HWND __stdcall CreateDlg(HWND hWndParent); #endif // IMPEXP_H

"TestDll.cpp"

#define TESTDLL_EXPORTS #include "ImpExp.h" #include "Dlg.h" TESTDLL_API HWND __stdcall CreateDlg(HWND hWndParent) { AFX_MANAGE_STATE(AfxGetStaticModuleState()); CDlg* pDlg = new CDlg(); if(!pDlg->Create(CWnd::FromHandle(hWndParent))) return NULL; return pDlg->m_hWnd; }

"Main.cpp" (link with the MFC dll .lib file)

// Main.cpp : Defines the entry point for the application. // #include "StdAfx.h" #include "resource.h" #include "..\ImpExp.h" HWND hModelessDlg; int CALLBACK DlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch(uMsg) { case WM_INITDIALOG: { hModelessDlg = CreateDlg(hDlg); break; } case WM_DESTROY : { DestroyWindow(hModelessDlg); break; } case WM_COMMAND: { switch(LOWORD(wParam)) { case IDCANCEL:EndDialog(hDlg, IDCANCEL); break; case IDOK:EndDialog(hDlg, IDOK); break; case IDC_SHOW: { ShowWindow(hModelessDlg, SW_SHOW); break; } case IDC_HIDE: { ShowWindow(hModelessDlg, SW_HIDE); break; } } } } return 0; } int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { return DialogBox(hInstance, MAKEINTRESOURCE(IDD_MAINDIALOG), NULL, DlgProc); }

the IDD_MAINDIALOG Dialog contains 2 buttons IDC_SHOW and IDC_HIDE.