My text messsage is not visible during my program works

[susay]

I have write a programm, to write a file format in an other.

The files are so big that the programm work very long. So I made a text message  that show the program is still working.

In the beginning was working well. But now the text messages is no longer displayed.
I have no idea what the problem is.

some code:

int CVICALLBACK ReadCallback (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int iConfiguration;
	switch (event)
	{
		case EVENT_COMMIT:
			
			SetCtrlAttribute (panelHandle, PANEL_TXTMSG_Load, ATTR_VISIBLE, 1);

			GetCtrlVal (panelHandle, PANEL_Dataset_Conf, &iConfiguration);	

			Function_Worker(iConfiguration);
			
			SetCtrlAttribute (panelHandle, PANEL_TXTMSG_Load, ATTR_VISIBLE, 0); 
				
			break;
		case EVENT_LEFT_CLICK:
			break;
	}
	return 0;
}

The function_worker does made nothing with the GUI but it works with a DLL. Is this a problem?

Do you have any ideas?

[Wolfgang · Accepted solution]

Hi,

When your program executes in a callback function or in code that does not call RunUserInterface or GetUserEvent, LabWindows/CVI does not process user interface events. Functions that are overly time-consuming can "lock out" user interface events. To allow LabWindows/CVI to process events, call ProcessDrawEvents.

[Wolfgang]

Somewhat more elaborate I'd suggest to modify your code as follows:

case EVENT_COMMIT:
    SetCtrlAttribute (panelHandle, PANEL_TXTMSG_Load, ATTR_VISIBLE, 1);

    ProcessDrawEvents ();
    GetCtrlVal (panelHandle, PANEL_Dataset_Conf, &iConfiguration);
    Function_Worker(iConfiguration);
    SetCtrlAttribute (panelHandle, PANEL_TXTMSG_Load, ATTR_VISIBLE, 0);
    break;

[susay]

Thank you very much. With "ProcessDrawEvents ();" it works perfectly.