C / C++ / MFC

Re: i want to know when a button is clicked but it was "DISABLED"

27-Feb-07 0:15

Ing.Raiz82 wrote:
is possible??

No.

Prasad
Notifier using ATL | Operator new[],delete[][^]

James R. Twine27-Feb-07 1:14

James R. Twine

27-Feb-07 1:14

   Do you want to know if the user tried to activate the disabled button? If so, trap mouse messages like WM_MOUSEMOVE and WM_LBUTTONUP (not WM_LBUTTONDOWN - normal buttons activate on the release of the mouse button).

   If you are worried about some other application sending you artificial button click messages (like the application that automatically dismisses the Outlook "something is trying to send email on your behalf" dialog), look for WM_COMMAND messages for that button, and if you know button's state when you last set it, you can determine if the message is real or not.

   Peace!

-=- James
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Re: i want to know when a button is clicked but it was "DISABLED"

Ing.Raiz8227-Feb-07 4:01

Ing.Raiz82

27-Feb-07 4:01

thanks
... is a good idea...
now i try....

thanks

Raiz Roll eyes | :rolleyes:

Destroy View

baerten27-Feb-07 0:04

27-Feb-07 0:04

Hi,

i create a Frame within a TabWnd. In the different Tabs, i place a View.
If i click on button on the view, i create dynammicaly a new View and replace it.
If the user wishes to close this new View, the old view returns.

The changing works nice, but i have trouble to close and delete the view.
I send a WM_CLOSE to the view and after this a delete :

LRESULT ViewTabWnd::CloseOld(WPARAM w, LPARAM l)
{
CWnd* Old = (CWnd*)w;
Old->SendMessage(WM_CLOSE);
delete Old;
return TRUE;
}

But at "delete Old" i have the error :

Last Trace : (<<<<<<< indicates the debug-trace )

void PASCAL CObject::operator delete(void* p)
{
#ifdef _AFX_NO_DEBUG_CRT
free(p);
#else
_free_dbg(p, _AFX_CLIENT_BLOCK); <<<<<<<<<
#endif
}

if (pHead->nBlockUse == _IGNORE_BLOCK)
{
_ASSERTE(pHead->nLine == IGNORE_LINE && pHead->lRequest == IGNORE_REQ);
/* fill the entire block including header with dead-land-fill */
memset(pHead, _bDeadLandFill,
sizeof(_CrtMemBlockHeader) + pHead->nDataSize + nNoMansLandSize);
_free_base(pHead); <<<<<<<<<<<<<<<<<
RTCCALLBACK(_RTC_FuncCheckSet_hook,(1));
return;
}

Does anyone knows this problem ?
I'm confused Sigh | :sigh:

Thanks

Re: Destroy View

prasad_som27-Feb-07 1:38

27-Feb-07 1:38

Looks like pointer you are deleting is already deleted and dangled .

baerten wrote:
LRESULT ViewTabWnd::CloseOld(WPARAM w, LPARAM l)

How this message/function is called ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: Destroy View

baerten27-Feb-07 1:51

27-Feb-07 1:51

thanks

via a PostMessage

LRESULT ViewTabWnd::CloseOld(WPARAM w, LPARAM l)
{
CWnd* Old = (CWnd*)w;
Old->SendMessage(WM_CLOSE);
delete Old; << I step here, then via F10 i step into the destructor and then the error is launched
return TRUE; << i never step here
}

Damn

baerten27-Feb-07 4:02

27-Feb-07 4:02

I found the error ...

It's a variable which has a wrong syntax, i wrote bool at place of BOOL

D'Oh! | :doh:

5 hours of recherche for nothing Dead | X|

Thanks anyway Smile | :)

Re: Damn

prasad_som27-Feb-07 4:16

27-Feb-07 4:16

baerten wrote:
It's a variable which has a wrong syntax, i wrote bool at place of BOOL

Nice to see, your error is solved.
But, really cant understand how it affects your code. Can you show changes , you needed to make.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: Damn

baerten27-Feb-07 21:02

27-Feb-07 21:02

i changed only bool to BOOL.

bool isn't a MFC Datatype, but however it could create it ( bool is used in .NET )
But at the destruction of this datatype he had the error.
But only if i create the view dynamicaly. If i created the same view with a Frame via CreateView
the error doesn't occur.

So, i could step into the Destructor and after the destructor all variables will be destroyed
and there, he had the error Sniff | :^)

That was an error of kind "too fast typing and too much thinking in the C#-Way" LOL

Re: Damn

prasad_som28-Feb-07 1:20

changing font size of cstatic ctrl. How ?

28-Feb-07 1:20

baerten wrote:
bool isn't a MFC Datatype

Its keyword in C++, so that should not be problem. Still confused. Smile | :)

.
Why it was so ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

sakthimuthu27-Feb-07 0:03

sakthimuthu

27-Feb-07 0:03

Hi,

I need to change the font size of CStatic ctrl.

How can do this ?

Thanks.

Re: changing font size of cstatic ctrl. How ?

Hamid_RT27-Feb-07 0:38

Hamid_RT

27-Feb-07 0:38

You can use of CreateFont and then use of SetFont And also see Nibu babu thomas answer to super_ttd (Strange Font bolding)

WhiteSky

Re: changing font size of cstatic ctrl. How ?

prasad_som27-Feb-07 1:28

Re: changing font size of cstatic ctrl. How ?

27-Feb-07 1:28

Look for LOGFONT-->lfHeight while creating font for static window.

Prasad
Notifier using ATL | Operator new[],delete[][^]

David Crow27-Feb-07 2:55

David Crow

27-Feb-07 2:55

See here.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

passing parameter in thread

neha.agarwal2726-Feb-07 23:40

neha.agarwal27

26-Feb-07 23:40

Hi all,

I have made a worker thread like this
UINT workerThread(LPVOID pParam)
{
return 0;
}

i want to pass a CString parameter to my thread

how to do it n how to do AfxBeginThread for passing CString parameter.......

thanxs in advance

Re: passing parameter in thread [modified]

toxcct26-Feb-07 23:42

toxcct

26-Feb-07 23:42

why not just calling like this :

CString str = _T("hello CP");
 
workerThread(&str);

from within the function, if you know you'll always get a CString, then use it like that :

UINT workerThread(LPVOID lpParam) {
    CString str = *(static_cast<CString*>(lpParam));
    //...
    return 0;
}

[VisualCalc][Flags Beginner's Guide] | [Forums Guidelines][My Best Advice]

Nibu babu thomas27-Feb-07 1:17

Nibu babu thomas

27-Feb-07 1:17

toxcct wrote:
CString str = _T("hello CP"); workerThread(&str);

str is a local object right? Passing local objects to thread function is a bad practice and leads to disaster.

Nibu thomas
A Developer

Programming tips[^] My site[^]

toxcct27-Feb-07 1:49

toxcct

27-Feb-07 1:49

Nibu babu thomas wrote:
str is a local object right?

not necessarily... i wrote it like that to show that it was defined first, but you're right, it wasn't clear enough

[VisualCalc][Flags Beginner's Guide] | [Forums Guidelines][My Best Advice]

James R. Twine27-Feb-07 1:24

James R. Twine

27-Feb-07 1:24

   As your earler response suggests, you may race on the CString going out of scope before the worker thread starts and can use it.

   This would have to be an instance of CString that would not go out of scope so quickly (static, member, global, dynamically allocated, etc. - whatever works best given the requirements).

   Peace!

James R. Twine27-Feb-07 1:29

James R. Twine

27-Feb-07 1:29

You can to it if you dynamically allocate the CString object and then free it in the worker thread. Be careful doing this if you are doing things like per-thread custom memory allocation routines, or if you pass the pointer across DLL or COM boundaries and then try to deallocate it - the DLL or COM object implementation may not use the same allocation/deallocation routines you are.

Something like the following should work (may contain errors, and has no error handling...):

CString *pString = new CString( _T( "Why Do You Need A CString?" ) );
 
AfxBeginThread( workerThread, (LPVOID)pString, ..... );
//
// And In workerThread...
//
{
    CString *pString = (CString*)pParam;
    //
    // Do Something With The String...
    //
    delete pString;
}

Peace!