Threads problem

[cheickna]

Hi,

I use Visual C++ 6.0 and i need help for the following problem.

In my App, i have two command button. The first button send some instructions

like this :

bool NoData=false;
while(1)
{
.....
OpenPort(PortId); // Open a port com ( for exemple com2)
WriteFile(.......); // Write to port com
.....
if(NoData)
{
ClosePort(PortId); //Close port com
break;
}
}

While my Button 1 send theses commands, i want to use button 2 to stop
this operation before Variable NoData is true.
To do this i try to close directly port com :

ClosePort(PortId); //Close port com

But it don't work, because i can press button 2 during this operation.


Is anybody can help me How can i use two threads to do this

Thanks in advance

[Scott Gines]

To do this, you use the command AfxBeginThread. It would go something like
this...

UINT ProcessThread(LPVOID param)
{
CMyDialog* pDlg = (CMyDialog*)param;

.....
OpenPort(PortId); // Open a port com ( for exemple com2)
WriteFile(.......); // Write to port com
.....
if(NoData)
{
ClosePort(PortId); //Close port com
break;
}

if(pDlg->m_bCloseThread == true) // Check to see if we want to get out
of the thread
return 0;
}

...

void CMyDialog::OnButton1()
{
m_bCloseThread = false;
AfxBeginThread(ProcessThread, this, THREAD_PRIORITY_NORMAL);
}

void CMyDialog::OnButton2()
{
m_bCloseThread = true;
}

Make sure that you have a m_bCloseThread as a public member of CMyDialog.


"cheickna" <cheickna.traore@almas.fr> wrote:
>
>Hi,
>
>I use Visual C++ 6.0 and i need help for the following problem.
>
>In my App, i have two command button. The first button send some instructions
>
>like this :
>
>bool NoData=false;
>while(1)
>{
> .....
> OpenPort(PortId); // Open a port com ( for exemple com2)
> WriteFile(.......); // Write to port com
> .....
> if(NoData)
> {
> ClosePort(PortId); //Close port com
> break;
> }
>}
>
>While my Button 1 send theses commands, i want to use button 2 to stop
>this operation before Variable NoData is true.
>To do this i try to close directly port com :
>
> ClosePort(PortId); //Close port com
>
>But it don't work, because i can press button 2 during this operation.
>
>
>Is anybody can help me How can i use two threads to do this
>
>Thanks in advance
>

[cheickna]

For this you also need thread synchronisation using critical section or mutex
or event.
for further clarification mail to gopal@cresofsol.com

"Scott Gines" <nospamsgines@qcomm.com> wrote:
>
>To do this, you use the command AfxBeginThread. It would go something like
>this...
>
>UINT ProcessThread(LPVOID param)
>{
> CMyDialog* pDlg = (CMyDialog*)param;
>
> .....
> OpenPort(PortId); // Open a port com ( for exemple com2)
> WriteFile(.......); // Write to port com
> .....
> if(NoData)
> {
> ClosePort(PortId); //Close port com
> break;
> }
>
> if(pDlg->m_bCloseThread == true) // Check to see if we want to get
out
>of the thread
> return 0;
>}
>
>...
>
>void CMyDialog::OnButton1()
>{
> m_bCloseThread = false;
> AfxBeginThread(ProcessThread, this, THREAD_PRIORITY_NORMAL);
>}
>
>void CMyDialog::OnButton2()
>{
> m_bCloseThread = true;
>}
>
>Make sure that you have a m_bCloseThread as a public member of CMyDialog.
>
>
>"cheickna" <cheickna.traore@almas.fr> wrote:
>>
>>Hi,
>>
>>I use Visual C++ 6.0 and i need help for the following problem.
>>
>>In my App, i have two command button. The first button send some instructions
>>
>>like this :
>>
>>bool NoData=false;
>>while(1)
>>{
>> .....
>> OpenPort(PortId); // Open a port com ( for exemple com2)
>> WriteFile(.......); // Write to port com
>> .....
>> if(NoData)
>> {
>> ClosePort(PortId); //Close port com
>> break;
>> }
>>}
>>
>>While my Button 1 send theses commands, i want to use button 2 to stop

>>this operation before Variable NoData is true.
>>To do this i try to close directly port com :
>>
>> ClosePort(PortId); //Close port com
>>
>>But it don't work, because i can press button 2 during this operation.
>>
>>
>>Is anybody can help me How can i use two threads to do this
>>
>>Thanks in advance
>>
>