Board index » cppbuilder » Unable to suspend a thread from a Form->buttonclick event

2004-02-12 07:36:42 PM
cppbuilder63
I want to suspend a thread when the user clicks on Form Button, but it seems
not to work. There is an Eaccess violation message when i try this command
Nethread->Suspended=true.
inside the Button click event.
Please help
cheers,
Ronan
 

"Bhuvan Sharma" < XXXX@XXXXX.COM >wrote in message
Chances are, your pointer to the thread is not set up correctly in the first
place.
Gambit
 

application thread, and button3click event should resume or suspend the
thread based on global variable Issuspended value.
=============================================
bool Issuspended;
__fastcall AppThread::AppThread(bool CreateSuspended)
: TThread(CreateSuspended)
{
Priority=tpLower;
FreeOnTerminate=true;
ADODataSet3 = new TADODataSet(NULL);
ADOConnection3 = new TADOConnection(NULL);
this->ADOConnection3->ConnectionString="Provider=MSDAORA.1;User
ID=bhuvan;Data Source=CCDDEV;Persist Security Info=False";
this->ADOConnection3->Connected=true;
this->ADODataSet3->Connection=this->ADOConnection3;
}
void __fastcall AppThread::Execute()
{
int i;
SetName();
int track=Form1->TrackBar1->Position;
CoInitialize(NULL);
this->run_the_application(); //basically calls the other thread
functions that do the database processing
}
void __fastcall TForm1::Button2Click(TObject *Sender)
{
//creates an application thread Newthread
AppThread *Newthread= new AppThread(false);
}
void __fastcall TForm1::Button3Click(TObject *Sender)
{
if(Issuspended)
{ Issuspended=false;
Newthread->Resume();
Form1->Button3->Caption="Pause";
}
else
{
Issuspended=true;
Newthread->Suspended=true;
// or i culd have used Newthread->Suspend(); as well but it also
returns the AV error
Form1->Button3->Caption="Resume";
}
}
"Remy Lebeau (TeamB)" < XXXX@XXXXX.COM >wrote in message

{smallsort}

"Bhuvan Sharma" < XXXX@XXXXX.COM >wrote in message
pointer. The local pointer will go out of scope when the event handler
returns and you will no longer have any access to the thread.
actually been assigned to anything. That is why you get an AV.
Gambit
 

Great, it works!!
thanks a ton
"Remy Lebeau (TeamB)" < XXXX@XXXXX.COM >wrote in message