Timers in c++
I'm just new to C/C++ and I've searched the web for a timer function.
I'm coding a console app that will set a timer running for 25 mins and get it to execute an external application after the time is up. (basically i need a console version of TTimer in borland c++ builder).
Could i have info on timers and execute functions please??
GE
I'm coding a console app that will set a timer running for 25 mins and get it to execute an external application after the time is up. (basically i need a console version of TTimer in borland c++ builder).
Could i have info on timers and execute functions please??
GE
Who is Participating?
no problem and to execute your external application you'll probably want to use one of the _spawn functions.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt__spawn.2c_._wspawn_functions.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt__spawn.2c_._wspawn_functions.asp
If your console prog already is running an infinite loop you may count the time by calls to GetTickCount() (assuming you are on a Windows platform, though there are equal functions on other platforms also).
void main()
{
long l1 = GetTickCount();
bool chkTimer = true;
while (true)
{
// check timer
if (chkTimer)
{
l2 = GetTickCount();
if (l2 - l1 >= 25*60*1000)
{
ShellExecute(...);
chkTimer = false;
}
}
// do other stuff
...
Sleep(10); // gives other applications cpu time
}
}
On NT, 2k and XP systems you also could use CreateWaitableTimer function. That gives a handle where you can wait for using WaitForSingleObject or WaitForMultipleObjects.
Regards, Alex
void main()
{
long l1 = GetTickCount();
bool chkTimer = true;
while (true)
{
// check timer
if (chkTimer)
{
l2 = GetTickCount();
if (l2 - l1 >= 25*60*1000)
{
ShellExecute(...);
chkTimer = false;
}
}
// do other stuff
...
Sleep(10); // gives other applications cpu time
}
}
On NT, 2k and XP systems you also could use CreateWaitableTimer function. That gives a handle where you can wait for using WaitForSingleObject or WaitForMultipleObjects.
Regards, Alex
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1) launch a separate thread (pass pointer to data structure if needed)
2) have that thread call Sleep(25*60*1000);
3) have that thread launch desired application
4) then thread returns and exits.
let me know if this sounds good to you and if you need more help.
cheers,
aaron