CWaitCursor issue

Hi,

My application initialization takes some time and I'd like to display a wait cursor while it is being loaded. So I have tried to put the following line at the beginning of my overridden CWinApp::InitInstance() method :

Code:

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CWaitCursor wait;

---

This changes nothing, the cursor is still displayed as an arrow. It seems it has something to do with being in the InitInstance() because it works later in other parts of the program. Would you have an explanation and/or a workaround ?

Thanks

Please Post the code for your CWaitCursor code. Not good at guessing games. Dont want to play 20 questions.

Try BeginWaitCursor () and EndWaitCursor ().

Quote:

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Originally Posted by ahoodin

Please Post the code for your CWaitCursor code. Not good at guessing games. Dont want to play 20 questions.

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OK here you go... with slight adaptations :

Code:

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// overriding virtual BOOL CWinApp::InitInstance() called by AfxWinMain(...)
BOOL CMyWinApp::InitInstance()
{
        CWaitCursor wait;

        InitCommonControls();

        CWinApp::InitInstance();

        // Initialize OLE libraries
        if (!AfxOleInit())
        {
                AfxMessageBox(IDP_OLE_INIT_FAILED);
                return FALSE;
        }
        AfxEnableControlContainer();

        GdiplusStartup(&GdiPlusToken, &GdiPlusStartupInput, NULL);

        // intialize application
        if (!CUIServicesController::get_instance()->initializeApplication())
        {
                exit(EXIT_SUCCESS);
        }

        _appInit = TRUE;

        SetRegistryKey(_T("MyApp"));
        LoadStdProfileSettings(4); 
        CSingleDocTemplate* pDocTemplate;
        pDocTemplate = new CSingleDocTemplate(
                IDR_MAINFRAME,
                RUNTIME_CLASS(CMyWinAppDoc),
                RUNTIME_CLASS(CMainFrame),
                RUNTIME_CLASS(CMyWinAppView));
        if (!pDocTemplate)
                return FALSE;
        AddDocTemplate(pDocTemplate);

        CCommandLineInfo cmdInfo;
        ParseCommandLine(cmdInfo);
        if (!ProcessShellCommand(cmdInfo))
                return FALSE;
       
        m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);
        m_pMainWnd->UpdateWindow();

        return TRUE;
}

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Quote:

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Originally Posted by Skizmo

Try BeginWaitCursor () and EndWaitCursor ().

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Already tried this and it doesn't work.
Also tried unsuccessfully SetCursor(LoadCursor(IDC_WAIT)) and AfxGetApp->DoWaitCursor(1).

Keep in mind, in order to use the SetCursor function, you need to handle the WM_SETCURSOR message.
Also I think somethings wrong with your LoadCursor function but, this morning I don't have access to the IDE so I can't double check that.

Sounds like you have a slow down in your code. The wait cursor only pops up when you want it.

I think that you should time sections of your code....time it.

eg:

Code:

---

int ntime=0;
LARGE_INTEGER ntime1,ntime2;
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);//initialize at app start
QueryPerformanceCounter(&ntime1);//at start of code to check
//...code to profile in here
dosomefunction();
QueryPerformanceCounter(&ntime2);//at end of code to check
//get ntime in microseconds
ntime = (ntime2.QuadPart-ntime1.QuadPart)/(freq.QuadPart/1000000);

---

HTH,

You also can try the SetClassLong function with the GCL_HCURSOR flag.

Code:

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SetClassLong (m_someWindowHandle, GCL_HCURSOR, m_someCursorHandle);

---

Quote:

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Originally Posted by ahoodin

I think that you should time sections of your code....time it.

---

No I don't have slow downs... It's juste that the following call actually does a lot of things :

Code:

---

        if (!CUIServicesController::get_instance()->initializeApplication())
        {
                exit(EXIT_SUCCESS);
        }

---

It's perfectly normal that it takes a few seconds...

Well I found that when you move your cursor over certain UI elements it is an arrow and hourglass. Othertimes it is just an arrow or vertical flatline.

FWIW.

Quote:

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Originally Posted by Skizmo

You also can try the SetClassLong function with the GCL_HCURSOR flag.

Code:

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SetClassLong (m_someWindowHandle, GCL_HCURSOR, m_someCursorHandle);

---

---

I think this method is meant to display a particular cursor when the mouse is on a particular window. In this case I don't have any window ready when calling the initialization method that requires a cursor change.

CWaitCursor class used to be helpful in 16-bit application to indicate something was going on, for long loops when application appeared to be frozen. That was before multithreading when local message loop was not used.
See following threads for discussions regarding CWaitCursor:
http://www.codeguru.com/forum/showthread.php?t=193132
http://www.codeguru.com/forum/showthread.php?t=198925
http://www.codeguru.com/forum/showthread.php?t=334368
http://www.codeguru.com/forum/showthread.php?t=318350

Quote:

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Originally Posted by tnarol

OK here you go... with slight adaptations :

Code:

---

        // intialize application
        if (!CUIServicesController::get_instance()->initializeApplication())
        {
                exit(EXIT_SUCCESS);
        }

---

---

Note, that you must not use exit in the MFC application.
If you want to exit from within InitInstance - just return false.
If you want to return the exit code - override the CApp::ExitInstance and return the code you want to.

If you still can't get any of those to work, why don't you launch a window, with a progress bar and a wait cursor?

Quote:

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Originally Posted by bderagon

If you still can't get any of those to work, why don't you launch a window, with a progress bar and a wait cursor?

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I think that's what I'm gonna do eventually.

I also tried this unsuccessfully :

Code:

---

BOOL cursorChange = FALSE;

HCURSOR waitCursor = LoadCursor(32514);
HCURSOR waitCursorCopy = CopyCursor(waitCursor);
cursorChange = SetSystemCursor(waitCursorCopy, 32512);

//
// ... long processing
//

cursorChange = SetSystemCursor(CopyCursor(LoadCursor(IDC_ARROW)), 32512);

---

The problem seems to be that a cursor change has to be processed by the message loop of a window. In this case I don't have any window ready at the time I want to change the cursor... I could see the cursor change briefly, but only after leavine the InitInstance() method.

I managed to get something almost good :

Code:

---

        HCURSOR normalCursor = GetCursor();
        HCURSOR waitCursor = ::LoadCursor(NULL, IDC_WAIT);
        HCURSOR waitCursorCopy = CopyCursor(waitCursor);
        cursorChange = SetSystemCursor(waitCursorCopy, 32512);

        // Init processing

        HCURSOR normalCursorCopy = CopyCursor(normalCursor);
        cursorChange = SetSystemCursor(normalCursorCopy, 32512);

---

This displays the hour glass while processing but doesn't restore the original normal cursor despite all cursor handles being != 0 and SetSystemCursor returning TRUE.

If I replace the normalCursor handle by a cursor in the application resources it works.

Code:

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HCURSOR normalCursor = LoadCursor(IDC_MY_CURSOR);

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Any ideas ?

This is purely a guess and I may be wrong - but is it possible that CWaitCursor will only work when called from an object that's a window? CWinApp is not a window and this might be why you're having the problem. Try moving the call to somewhere more appropriate (e.g. OnInitDialog() if the app was dialog based).

As I said, I might be wrong but there's something ringing a bell in the back of my mind... :wave: