unable to update Time in RunUserInterface

[SCIENTIST 667]

While running our program, we want to update Time in our Panel but with RunUserInterface and using panel callbacks we are unable to update Time.
We are working in Windows-2000

[msaxon]

Assuming you mean that you have a control on your panel showing time of day, the most common way of updating it is to put a timer control on the panel, and use the EVENT_TIMER_TICK event in the timer's callback to update your control.

[Gregoire Diehl]

Hello Scientist,

perhaps have a look at the InstallMainCallback function.

Example:

in the main routine you have to install the callback like:
InstallMainCallback (MyLoop, 0, 1);

In the MyLoop function you can put code like this to display systemtime
continuously :

int MyLoop()
{
int h, m, s;
char time[20];

GetSystemTime (&h, &m, &s);
sprintf(time, "%.2d:%.2d:%.2d", h, m, s);
SetCtrlVal(main_panel, PANEL_TIME, time);
}

regards
Gregoire

[mfukuchi]

Hello,
I'm not sure what you mean by "unable to update Time"; do you mean that the UI does not display the updated time? If so, it might be because one of the callback functions takes a long time to execute, and while it is executing, your program cannot process other events (in this case a UI event), therefore it cannot update the UI until that long callback function exits.

What you can do is, call ProcessDrawEvents or ProcessSystemEvents functions in the callback function that is taking a long time to execute. Those two functions allow LabWindows/CVI to process other events before the callback function exits. Please refer to LabWindows/CVI Help that ships with LabWindows/CVI for more information on ProcessDrawEvents and ProcessSystemEvents.

Mika Fukuchi
Appl
ication Engineer
National Instruments