AfxBeginThread

viperlogic

i have a function that i want a worker thread to execute it, my function is of the type bool wmi(IP) Can i use AfxBeginThread() with this or can only void functions be called? how can i pass a variable back or do i have to use a pointer? thanks

includeh10

if u want to pass a variable back, u must use a pointer. code is in this way: ...ThreadFunction(void*pv) { SomeClass*pc=(SomeClass*)pv; pc->SomeVariableBack=...; } it may not be what u want ...

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David Crow

viperlogic wrote:

Can i use AfxBeginThread() with this

Indirectly you can. Something like:

AfxBeginThread(ThreadProc);
...
UINT ThreadProc( LPVOID lpParam )
{
wmi();
}

You'll likely need to use the second argument to AfxBeginThread() as a way to call or communicate with the wmi() function.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

viperlogic

thx for the reply how would i implement a timer, so that after say 5secs if the thread hasnt finished, kill it?

David Crow

Use WaitForSingleObject() for this.

CWinThread *pThread = AfxBeginThread(..., CREATE_SUSPENDED);
pThread->m_bAutoDelete = FALSE;
pThread->ResumeThread();
...
switch(WaitForSingleObject(pThread->m_hThread, 5000))
{
case WAIT_TIMEOUT:
// need to kill the thread
break;

case WAIT\_OBJECT\_0:
    // thread has terminated on its own
    break;

}

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

viperlogic

thx for the replys i am having trouble implementing AfxBeginThread() void CScanDlg::OnButtonScan() { AfxBeginThread(ThreadProc); } UINT CScanDlg::ThreadProc(LPVOID pParam) { if(wmi(strIP1)) return 0; else return 1; } what is wrong above, sorry about these questions but this is new to me

David Crow

viperlogic wrote:

i am having trouble implementing AfxBeginThread()...

Aside from not suppling enough arguments, what troubles are you having?

viperlogic wrote:

UINT CScanDlg::ThreadProc(LPVOID pParam)

Is this a static member?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

viperlogic

ok this is what i have.. static UINT CScanDlg::ThreadProc(LPVOID pParam); delcared in the header file AfxBeginThread(ThreadProc,NULL,THREAD_PRIORITY_NORMAL,0,0,NULL); UINT CScanDlg::ThreadProc(LPVOID pParam) { if(wmi(strIP1)) return 0; else return 1; } i get the following error CScanDlg::wmi' : illegal call of non-static member function

David Crow

Try:

AfxBeginThread(ThreadProc, this);
...
UINT CScanDlg::ThreadProc( LPVOID pParam )
{
CScanDlg *pDlg = (CScanDlg *) pParam;

if (pDlg->wmi(strIP1))
    return 0;
else
    return 1;

}

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

viperlogic

thx, that worked can explain why thou?