If OnInit fails, program crashes Topic is solved

[rodrigod]

On my program I test if it is already open and if it is, OnInit() returns false and was suposed to close the aplication. But instead it crashes.

Debuging I saw that it crashes after it returns false it crashes when the function wxEntryCleanup calls delete app.

I have no idea what the problems is. Is there any clue of what could cause this

thanks

[spectrum]

hi rodrigod,

mm yes, is right, returning flase the application should terminate.

I think that if you have a small code snippets and the call stack trace we can help you.

greetings

[rodrigod]

Here it is

Code: Select all

DECLARE_APP(CSPPCOMMApp)
IMPLEMENT_APP(CSPPCOMMApp)

CSPPCOMMApp::CSPPCOMMApp() : wxApp()
{
} 


bool CSPPCOMMApp::OnInit()
{
if (ProcessActive("SPPCOMFG.EXE") != 0 )
{
     ErrMessage(IDS_APLIC_DISP,1,"");
     return false;
}
}

header

Code: Select all

class CSPPCOMMApp : public wxApp
{
public:
	CSPPCOMMApp();

	virtual bool OnInit();
	virtual int OnExit();

};

This is about it. Any ideas?

[doublemax]

Code: Select all

CSPPCOMMApp::CSPPCOMMApp() : wxApp()
{
}

you're not supposed to have a ctor for this. That happens in the IMPLEMENT_APP macro.

[rodrigod]

I removed it and the error continued.

It is a heap problem. It happens when wx tries to delete the application class in the following function.

Code: Select all

void wxEntryCleanup()
{
    DoCommonPreCleanup();


    // delete the application object
    if ( wxTheApp )
    {
        wxTheApp->CleanUp();

        // reset the global pointer to it to NULL before destroying it as in
        // some circumstances this can result in executing the code using
        // wxTheApp and using half-destroyed object is no good
        wxAppConsole * const app = wxApp::GetInstance();
        wxApp::SetInstance(NULL);
        delete app;
    }


    DoCommonPostCleanup();
}

Everything goes fine until delete app, and in the debug I saw that app is pointing to the correct class. So what could be the problem???

thanks

[doublemax]

did you remove the default ctor from the class declaration, too?

Can you post a minimal complete sample that creates the error?

There is something wrong with the application object and i think this might also be the problem in your other thread "Unexpected Parameter".

[rodrigod]

Thanks for the help,
when trying to reproduce the error in another file I found what the problem was. I am porting from mfc. and in mfc there is no DECLARE_APP(AppClass) macro, it is used like a class:
AppClass theApp;
And this line caused the error.
however the Unexpected error still occours

[Auria]

Well is it fixed or not? When you say you still get the 'Unexpected error', that's not very precise, since most errors are unexpected

[rodrigod]

oops I wrote it wrong. I meant the error Unexpected Parameter still occours