asked on

Wait cursor problem !

I have written a sample appliction dialog box which
has 2 buttons (Start and Stop wait cursor). The first
button display the wait cursor and the second stop it.
I have tested it with 'DoWaitCursor' and with 'CCmdTarget'.

// First method
void CMyDialogBox::OnStart()
{
((CMyApp *)AfxGetApp())->DoWaitCursor(1);
}

void CMyDialogBox::OnStop()
{
((CMyApp *)AfxGetApp())->DoWaitCursor(-1);
}

// Second method
CCmdTarget g_CmdTarget;

void CMyDialogBox::OnStart()
{
g_CmdTarget.BeginWaitCursor();
}

void CMyDialogBox::OnStop()
{
g_CmdTarget.EndWaitCursor();
}

It doesn't work when application is a dialog box ! Why ?
But it works when the sample is an SDI or MDI application.

Can someone help me !
Thanks,
Mike.

ASKER CERTIFIED SOLUTION

Norbert

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

mike_marquet

ASKER

I have do this but it doesn't work. Here is the sample application I have written for the test. Can you look where's
the mistake !

// *************************************************************
// *************************************************************
// WaitCursorTester.h : main header file for the WAITCURSORTESTER application
//

#if !defined(AFX_WAITCURSORTESTER_H__B93D9CC4_1A59_11D2_92DA_99548D96D21C__INCLUDED_)
#define AFX_WAITCURSORTESTER_H__B93D9CC4_1A59_11D2_92DA_99548D96D21C__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h"            // main symbols

/////////////////////////////////////////////////////////////////////////////
// CWaitCursorTesterApp:
// See WaitCursorTester.cpp for the implementation of this class
//

class CWaitCursorTesterApp : public CWinApp
{
public :
CWaitCursorTesterApp();

public :
      //{{AFX_VIRTUAL(CWaitCursorTesterApp)
      virtual BOOL InitInstance();
      //}}AFX_VIRTUAL

      //{{AFX_MSG(CWaitCursorTesterApp)
      //}}AFX_MSG
      DECLARE_MESSAGE_MAP()
afx_msg void OnUserMessage(UINT, LONG);
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Developer Studio will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_WAITCURSORTESTER_H__B93D9CC4_1A59_11D2_92DA_99548D96D21C__INCLUDED_)

// *************************************************************
// *************************************************************

// WaitCursorTester.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "WaitCursorTester.h"
#include "WaitCursorTesterDlg.h"
#include "Defines.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CWaitCursorTesterApp

BEGIN_MESSAGE_MAP(CWaitCursorTesterApp, CWinApp)
      //{{AFX_MSG_MAP(CWaitCursorTesterApp)
      //}}AFX_MSG
      ON_COMMAND(ID_HELP, CWinApp::OnHelp)
ON_THREAD_MESSAGE(WM_USER, OnWaitCursor)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWaitCursorTesterApp construction

CWaitCursorTesterApp::CWaitCursorTesterApp()
{
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CWaitCursorTesterApp object

CWaitCursorTesterApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CWaitCursorTesterApp initialization

BOOL CWaitCursorTesterApp::InitInstance()
{
#ifdef _AFXDLL
Enable3dControls();                  // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic();      // Call this when linking to MFC statically
#endif

CWaitCursorTesterDlg dlg;
m_pMainWnd = &dlg;
dlg.DoModal();

return FALSE;
}

// ---------------------------------------------------------------------------

void CWaitCursorTesterApp::OnUserMessage(UINT State, LONG)
{
if (State) BeginWaitCursor();
else EndWaitCursor();
}

// *************************************************************
// *************************************************************

// WaitCursorTesterDlg.h : header file
//

#if !defined(AFX_WAITCURSORTESTERDLG_H__B93D9CC6_1A59_11D2_92DA_99548D96D21C__INCLUDED_)
#define AFX_WAITCURSORTESTERDLG_H__B93D9CC6_1A59_11D2_92DA_99548D96D21C__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

/////////////////////////////////////////////////////////////////////////////
// CWaitCursorTesterDlg dialog

class CWaitCursorTesterDlg : public CDialog
{
public :
CWaitCursorTesterDlg(CWnd* pParent = NULL);

protected :
HICON m_hIcon;

public :
      //{{AFX_DATA(CWaitCursorTesterDlg)
      enum { IDD = IDD_WAITCURSORTESTER_DIALOG };
      //}}AFX_DATA

protected :
      //{{AFX_VIRTUAL(CWaitCursorTesterDlg)
      protected:
      virtual void DoDataExchange(CDataExchange* pDX);      // DDX/DDV support
      //}}AFX_VIRTUAL

      //{{AFX_MSG(CWaitCursorTesterDlg)
      virtual BOOL OnInitDialog();
      afx_msg void OnPaint();
      afx_msg HCURSOR OnQueryDragIcon();
      afx_msg void OnPB_Start();
      afx_msg void OnPB_Stop();
      //}}AFX_MSG
      DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Developer Studio will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_WAITCURSORTESTERDLG_H__B93D9CC6_1A59_11D2_92DA_99548D96D21C__INCLUDED_)

// *************************************************************
// *************************************************************

// WaitCursorTesterDlg.cpp : implementation file
//

#include "stdafx.h"
#include "WaitCursorTester.h"
#include "WaitCursorTesterDlg.h"
#include "Defines.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CWaitCursorTesterDlg dialog

CWaitCursorTesterDlg::CWaitCursorTesterDlg(CWnd* pParent) : CDialog(CWaitCursorTesterDlg::IDD, pParent)
{
      //{{AFX_DATA_INIT(CWaitCursorTesterDlg)
      //}}AFX_DATA_INIT
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

// ---------------------------------------------------------------------------

void CWaitCursorTesterDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
      //{{AFX_DATA_MAP(CWaitCursorTesterDlg)
      //}}AFX_DATA_MAP
}

// ---------------------------------------------------------------------------

BEGIN_MESSAGE_MAP(CWaitCursorTesterDlg, CDialog)
      //{{AFX_MSG_MAP(CWaitCursorTesterDlg)
      ON_WM_PAINT()
      ON_WM_QUERYDRAGICON()
      ON_BN_CLICKED(IDPB_START, OnPB_Start)
      ON_BN_CLICKED(IDPB_STOP, OnPB_Stop)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWaitCursorTesterDlg message handlers

BOOL CWaitCursorTesterDlg::OnInitDialog()
{
CDialog::OnInitDialog();

SetIcon(m_hIcon, TRUE);                  // Set big icon
SetIcon(m_hIcon, FALSE);            // Set small icon

return TRUE;
}

// ---------------------------------------------------------------------------

void CWaitCursorTesterDlg::OnPaint()
{
if (IsIconic())
{
      CPaintDC dc(this); // device context for painting

      SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

      // Center icon in client rectangle
      int cxIcon = GetSystemMetrics(SM_CXICON);
      int cyIcon = GetSystemMetrics(SM_CYICON);
      CRect rect;
      GetClientRect(&rect);
      int x = (rect.Width() - cxIcon + 1) / 2;
      int y = (rect.Height() - cyIcon + 1) / 2;

      // Draw the icon
      dc.DrawIcon(x, y, m_hIcon);
}
else CDialog::OnPaint();
}

// ---------------------------------------------------------------------------

HCURSOR CWaitCursorTesterDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

// ---------------------------------------------------------------------------

void CWaitCursorTesterDlg::OnPB_Start()
{
//((CWaitCursorTesterApp *)AfxGetApp())->PostThreadMessage(WM_USER,1L,0L);
BeginWaitCursor();
}

// ---------------------------------------------------------------------------

void CWaitCursorTesterDlg::OnPB_Stop()
{
//((CWaitCursorTesterApp *)AfxGetApp())->PostThreadMessage(WM_USER,0L,0L);
EndWaitCursor();
}

// *************************************************************
// *************************************************************

Norbert

One thing I can See:
you are using WM_USER! The MFC uses some WM_USER Messages therfore never use WM_USER it is better to use
WM_USER+10

BTW You have Accepted the answer normaly it is better to reject an Answer if it does not fullfill your requirements so other experts can answer also now this question is inside the answered question section an most experts will not look there to answer someting

mike_marquet

ASKER

Thanks

Norbert

does it work now ?