Close A DIalog - C / C++ / MFC Discussion Boards

john563218-Jan-10 1:58

18-Jan-10 1:58

Hi,

I tried with win32 dialog..woking fine with button and list control but when I place a tab control or tree control...dialog does not appear but runs behind.

What might be the problem?

Re: win32 dialog

Abhi Lahare18-Jan-10 6:16

Abhi Lahare

18-Jan-10 6:16

adjust the positions of all child control properly

Threading

HakunaMatada18-Jan-10 1:48

HakunaMatada

18-Jan-10 1:48

Could someone direct me to a resource on threading for C++? I am familiar with threading but I would like to learn more about thread synchronization, UI Threads, Updating UI via worker threads, etc. Also, I would also like to learn about memory profiling and finding memory leaks in the code. Any kind of help would be deeply appreciated.

Also, is it ok to update the UI of a dialog from a worker thread using SendMessage/PostMessage? How do I handle multiple worker threads making changes to the same UI?

Thank You.

---

Hakuna-Matata Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
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Re: Threading

Cedric Moonen18-Jan-10 2:08

Cedric Moonen

18-Jan-10 2:08

Here[^] is one of the best article I've read about threading. It will answer a lot of your questions.

Cédric Moonen
Software developer

Charting control [v3.0 - Updated]
OpenGL game tutorial in C++

Re: Threading

HakunaMatada18-Jan-10 2:11

HakunaMatada

18-Jan-10 2:11

Thank You Cedric. Your help is much appreciated. Smile | :)

---

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It means no worries for the rest of your days...
It's our problem free, Philosophy
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Re: Threading

Moak18-Jan-10 3:34

Moak

18-Jan-10 3:34

Hi, here is more stuff to read:

- Using Worker Threads[^] by Joseph M. Newcomer
- Threads, Processes and IPC[^] on CodeProject

Enjoy Smile | :)

Webchat in Europe Java | [Coffee]

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Re: Threading

HakunaMatada19-Jan-10 1:26

HakunaMatada

19-Jan-10 1:26

Thank You! Smile | :)

---

Hakuna-Matata Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
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Close A DIalog

john563218-Jan-10 0:58

john5632

18-Jan-10 0:58

Hi,

I tried to create a dialog (Modal) based application using win32. It is working but
at close button not able to close.

It is disappearing but not closing properly..my mean to say is that running behind..I checked with Task Manager.

Code for CallBack procedure is as:

BOOL CALLBACK ToolDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)

case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDOK:
EndDialog(hwnd, wParam);
return (INT_PTR)TRUE;
}
break;

What is the wrong?

Re: Close A DIalog

Code-o-mat18-Jan-10 1:25

Code-o-mat

18-Jan-10 1:25

My guess is that your main message loop keeps on going. Just because you close a dialog the program's message loop won't quit. Depending on your implementation you need to somehow tell the loop to stop processing messages, for example by using PostQuitMessage[^].

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: Close A DIalog

john563218-Jan-10 1:29

john5632

18-Jan-10 1:29

Thank you

Thread paused

susanne117-Jan-10 23:56

susanne1

17-Jan-10 23:56

I have a thread, it is has a normal priority, when it starts to excute, it runs for 5 or 6 seconds then stops for 3 or 4 seconds and run again, stops again this goes till it finishes his work. Any idea why this happens, programm code is in Visual C++.
Thanks

Re: Thread paused

CPallini18-Jan-10 0:16

CPallini

18-Jan-10 0:16

Isn't that (being scheduled) the normal thread beahviour?
Smile | :)

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-- Alfonso the Wise, 13th Century King of Castile.

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[My articles]

Re: Thread paused

susanne118-Jan-10 0:50

susanne1

18-Jan-10 0:50

i changed the thread priority to HIGHEST, but it didi not help.

Re: Thread paused

CPallini18-Jan-10 0:58

CPallini

18-Jan-10 0:58

Simply don't do that. It is normal for threads being scheduled.
Smile | :)

Re: Thread paused

Covean18-Jan-10 0:59

Covean

18-Jan-10 0:59

Being scheduled is normal thread behaviour! But it's not a normal thread behaviour to wait 3-5 seconds to get the next time slice!

Greetings
Covean

Re: Thread paused

CPallini18-Jan-10 1:39

CPallini

18-Jan-10 1:39

True but it really depends on how those 3-5 seconds come out? Are they just a OP impression? How did she measure them?
Smile | :)

Re: Thread paused

Covean18-Jan-10 1:57

Covean

18-Jan-10 1:57

Yes there you are right. But in normal nobody should notice the thread-switches (if the thread and the process doesn't have the lowest priority or many real-time priority processes are running), so I would assume that the op has a real problem with it, no matter if the thread pauses for 300-500ms or 3-5s.

Greetings
Covean

Re: Thread paused

xushih19-Jan-10 1:38

xushih

19-Jan-10 1:38

use function Sleep(n_time).

Re: Thread paused

CPallini19-Jan-10 1:54

CPallini

19-Jan-10 1:54

Uh?!
OP missed?
Big Grin | :-D

Re: Thread paused

Adam Roderick J18-Jan-10 0:18

Adam Roderick J

18-Jan-10 0:18

I prefer you to read chapter 2. Processes and threads from "Modern Operating Systems" by Andrew S Tannenbaum.
It will be useful for you.

Величие не Бога может быть недооценена.

Re: Thread paused

Covean18-Jan-10 1:02

Covean

18-Jan-10 1:02

Can you please post your threads code to see if they are waiting for some reason.

Edit: Did some typo.

Greetings
Covean

Re: Thread paused

susanne118-Jan-10 1:16

susanne1

18-Jan-10 1:16

void CMyThread::ThreadStart()
{
if (m_pSelThread != NULL) // CWinThread* m_pSelThread;
{
if (::WaitForSingleObject(m_pSelThread->m_hThread, 0) != WAIT_OBJECT_0)
return;

delete m_pSelThread;
m_pSelThread = NULL;
}

m_pSelThread = AfxBeginThread((AFX_THREADPROC)ThreadFunction, this, THREAD_PRIORITY_NORMAL, 0,CREATE_SUSPENDED);

m_pSelThread->m_bAutoDelete = FALSE;

m_pSelThread->ResumeThread();
}

UINT CMyThread::ThreadFunction
(
LPVOID param
)
{
while(!bTerminate) // bool bTerminate
{
if ((::WaitForSingleObject(m_Sel_End_Event, 0) == WAIT_OBJECT_0))
{
bTerminate = true;
continue;
}
}

Re: Thread paused

Covean18-Jan-10 1:49

Covean

18-Jan-10 1:49

I couldn't find any reason why your thread pauses for 3-5 seconds.
But your "main loop" is a kind of resource-eating.
Do you really meant to use a timeout of 0 to wait for this object?
0 timeout means to check the signaled state of the waitable handle
and to return immediately. So your loop will iterate very very fast and
consumes nearly 100% processing time.

UINT CMyThread::ThreadFunction(LPVOID param)
{
    while(!bTerminate) // bool bTerminate 
    {
        if ((::WaitForSingleObject(m_Sel_End_Event, 0) == WAIT_OBJECT_0))
        {
            bTerminate = true; 
            continue;
        } 
    }
}

But as I said before this doesn't solve your problem. Is there maybe more code you can provide?
By the way you also use the 0 timeout also in your ThreadStart function (but there it shouldn't be
a problem).

Greetings
Covean

Object in a Regular DLL

Lazzari Patrizio17-Jan-10 22:20

Lazzari Patrizio

17-Jan-10 22:20

Hi to everybody.

I have used a Regular DLL in VC++ (ver 6.0) but i have some problems when i use the object.
I have create a new object:

"CObOggetto*pOggettoDaRibaltare = new CObOggetto;"

but when i try to use the variables into the object ...

pOggetto->m_sCodiceContratto = "000001";

the application crash like a the pointer is not allocated!!!
The variables are all CString.

Can you help me???

Hi! I'm very happy to talk with everybody about VC++.

Re: Object in a Regular DLL

Lazzari Patrizio17-Jan-10 22:23

Lazzari Patrizio

17-Jan-10 22:23

Sorry!!!

The code are this:

"CObOggetto*pOggetto = new CObOggetto;"

but when i try to use the variables into the object ...

pOggetto->m_sCodiceContratto = "000001";

Can you help me???

Hi! I'm very happy to talk with everybody about VC++.

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