DAQmxCreateTask when called,the GUI hangs

[erraunakgupta]

Hello Guys,

I have created a UI which connects to a hardware. I have started writing code for the hardware connection in my UI source code which can be seen below. As soon as the code executes the DAQmx configure code: -DAQmxCreateTask("Dev0-R",&taskHandle[0]);, the UI hangs and does not work further. Can anyone tell me what exactly is the problem. I an not connected to any hardware currently but creating a task command should work in my case. I am confused how to go further. Please help.

// Code is shown below

TaskHandle    taskHandle[4];

int main (int argc, char *argv[])
{
    int error = 0;
    
    /* initialize and load resources */
    nullChk (InitCVIRTE (0, argv, 0));
    errChk (panelHandle = LoadPanel (0, "PintschBamag.uir", PANEL));
    errChk (AttributePanelHandle = LoadPanel (0, "PintschBamag.uir", ATTR_PANEL));
    
    /* display the panel and run the user interface */
    errChk (DisplayPanel (panelHandle));
    
    /* Place for configuring the Hardware Channel connection*/
    
    /*FOr the DAQMx*/
    //char        errBuff[2048]={'\0'};
    
    /*********************************************/
    // DAQmx Configure Code
    /*********************************************/
    DAQmxCreateTask("Dev0-R",&taskHandle[0]);
    DAQmxCreateTask("Dev3-R",&taskHandle[1]);
    DAQmxCreateTask("Dev4-R",&taskHandle[2]);
    DAQmxCreateTask("Dev5-R",&taskHandle[3]);

//code ends here

Thanks,

Raunak

[RobertoBozzolo]

The most evident fact is that RunUserInterface () is missing: did you simply miss to copy it or is not present in your actual code? RunUserInterface if the fundamental instruction that start all UI processing: if it is not called you won't be able to handle the UI.

[erraunakgupta]

    RunUserInterface () is definately called after creating the tasks (not mentioned in the above code).  But the thing is the intruction does not reach it and stops at DAQmxCreateTask("",&taskHandle[0])

[RobertoBozzolo]

Does the function return any error code? Pass it to DAQmxGetErrorString to get a description of the error, if any.

What happen if you pass an empty string as the task name?

[erraunakgupta]

The function does not return any error code. It just displays the GUI and hangs. If I pass " " empty string as the nask name, still I get the same scenario. The only difference is that I get a warning:

   warning: incompatible pointer types passing 'char [1]' to parameter of type 'TaskHandle *' (aka 'void **')

Br/

Raunak

[RobertoBozzolo]

That's a very strange error indeed: it should not happen if the environment is properly configured.

Which version of CVI are you using? And DAQmx? Can you run any of the examples shipped with DAQmx?

[erraunakgupta]

I am using the latest 2015 evaluation version of both CVI and DAQmx.

I ran the same scenario where the system hangs, then after wating for about a minute I create task is executed. But still I do not understand why this takes so much time??

[RobertoBozzolo]

So you are saying that:

1. You run the code and it hangs on the first CreateTask
2. You wait for ~1 min
3. You run again the same code without any modification and it runs correctly

Am I correct?

Do you abort the code when it hangs on step 1? Or simply wait and the code proceeds after the pause/timeout?

I seem to understand that you are in the initial steps of development: can you post your complete code?

Again I'm asking if the same behaviour applies to DAQmx built-in examples.

[erraunakgupta]

I run the code only once. I wait for the code line createtask to execute (It takes 1-2 min), then the code jumps to nect nile which displays the panel and then RunUserInterface (see below).

(Again I'm asking if the same behaviour applies to DAQmx built-in examples) - Yes I checked one of the Daqmx code name -(Read Digital port).

It also did the same (took time on create task).

MY CODE:

int main (int argc, char *argv[])
{
    int error = 0;
    
    /* initialize and load resources */
    nullChk (InitCVIRTE (0, argv, 0));
    errChk (panelHandle = LoadPanel (0, "PintschBamag.uir", PANEL));
    errChk (AttributePanelHandle = LoadPanel (0, "PintschBamag.uir", ATTR_PANEL));
    
    
    /* Place for configuring the Hardware Channel connection*/
    
    /*FOr the DAQMx*/
    //char        errBuff[2048]={'\0'};
    
    /*********************************************/
    // DAQmx Configure Code
    /*********************************************/
    //Read Tasks
    
    DAQmxCreateTask("Dev0-R",&taskHandle[0]);
    DAQmxCreateTask("Dev3-R",&taskHandle[1]);
    DAQmxCreateTask("Dev4-R",&taskHandle[2]);
    DAQmxCreateTask("Dev5-R",&taskHandle[3]);
    
    //Write Tasks  
    
    DAQmxCreateTask("Dev0-W3",&taskHandle[4]);
    DAQmxCreateTask("Dev0-W4",&taskHandle[5]);
    DAQmxCreateTask("Dev0-W5",&taskHandle[6]);
    DAQmxCreateTask("Dev3-W3",&taskHandle[7]);
    DAQmxCreateTask("Dev3-W4",&taskHandle[8]);
    DAQmxCreateTask("Dev3-W5",&taskHandle[9]);
    DAQmxCreateTask("Dev4-W3",&taskHandle[10]);
    DAQmxCreateTask("Dev4-W4",&taskHandle[11]);
    DAQmxCreateTask("Dev4-W5",&taskHandle[12]);
    DAQmxCreateTask("Dev5-W3",&taskHandle[13]);
    DAQmxCreateTask("Dev5-W4",&taskHandle[14]);
    DAQmxCreateTask("Dev5-W5",&taskHandle[15]);
    
    // Read Barrier Task
    DAQmxCreateTask("Dev1_2-R1_2",&taskHandle[16]);
    */
    

//    /*    Creating Reading Channels        */
//    /*    LED - Creating channels for EA48_1 and half EA48_2*/
//    DAQmxCreateDIChan(taskHandle[0],"Dev0/port0/line0:7,Dev0/port1/line0:7,Dev0/port2/line0:7","",DAQmx_Val_ChanForAllLines);
//
//    /*    LED - Creating channels for EAÜS_1, EAÜS_2, EAÜS_3, EAÜS_4 */
//    DAQmxCreateDIChan(taskHandle[1],"Dev3/port0/line0:7,Dev3/port1/line0:7,Dev3/port2/line0:7","",DAQmx_Val_ChanForAllLines);
//
//    /*    LED - Creating channels for half EA48_2 and EA48_3 */
//    DAQmxCreateDIChan(taskHandle[2],"Dev4/port0/line0:7,Dev4/port1/line0:7,Dev4/port2/line0:7","",DAQmx_Val_ChanForAllLines);
//
//    /*    LED - Creating channels for EA-BÜBÜ1, EA-BÜBÜ2 and EA48_4*/
//    DAQmxCreateDIChan(taskHandle[3],"Dev5/port2/line0:7,Dev5/port0/line0:7,Dev5/port1/line0:7","",DAQmx_Val_ChanForAllLines);
//    
//    /*    LED - Creating channels for H1-H8 Barriers*/
//    DAQmxCreateDIChan(taskHandle[16],"Dev1/port0/line0:7,Dev1/port1/line0:7,Dev1/port2/line0:7,Dev2/port0/line0:7,Dev2/port1/line0:7","",DAQmx_Val_ChanForAllLines);
//    
//    /*    Creating Writing Channels        */
//    /*    Taster/Schaltet - GSM_1 & GSM_2    */
//    DAQmxCreateDOChan(taskHandle[4],"Dev0/port3/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[5],"Dev0/port4/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[6],"Dev0/port5/line0:7","",DAQmx_Val_ChanForAllLines);
//
//    /*    Taster/Schaltet - HSM_1 & HSM_2    */
//    DAQmxCreateDOChan(taskHandle[7],"Dev3/port3/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[8],"Dev3/port4/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[9],"Dev3/port5/line0:7","",DAQmx_Val_ChanForAllLines);
//
//    /*    Taster/Schaltet - Eingänge EA48_1,EA48_2 & EA48_3 */
//    DAQmxCreateDOChan(taskHandle[10],"Dev4/port3/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[11],"Dev4/port4/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[12],"Dev4/port5/line0:7","",DAQmx_Val_ChanForAllLines);
//    
//    /*    Taster/Schaltet - Eingänge EA48_4 */
//    DAQmxCreateDOChan(taskHandle[13],"Dev5/port3/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[14],"Dev5/port4/line0:7","",DAQmx_Val_ChanForAllLines);
//    DAQmxCreateDOChan(taskHandle[15],"Dev5/port5/line0:7","",DAQmx_Val_ChanForAllLines);       
//    
//    /*********************************************/
//    // DAQmx Start Code
//    /*********************************************/
//    DAQmxStartTask(taskHandle[0]);
//    DAQmxStartTask(taskHandle[1]);
//    DAQmxStartTask(taskHandle[2]);
//    DAQmxStartTask(taskHandle[3]);
//    DAQmxStartTask(taskHandle[4]);
//    DAQmxStartTask(taskHandle[5]);
//    DAQmxStartTask(taskHandle[6]);
//    DAQmxStartTask(taskHandle[7]);
//    DAQmxStartTask(taskHandle[8]);
//    DAQmxStartTask(taskHandle[9]);
//    DAQmxStartTask(taskHandle[10]);
//    DAQmxStartTask(taskHandle[11]);
//    DAQmxStartTask(taskHandle[12]);
//    DAQmxStartTask(taskHandle[13]);
//    DAQmxStartTask(taskHandle[14]);
//    DAQmxStartTask(taskHandle[15]);
//    DAQmxStartTask(taskHandle[16]);

    /* display the panel and run the user interface */
    errChk (DisplayPanel (panelHandle));
    
    CA_InitActiveXThreadStyleForCurrentThread (0, COINIT_APARTMENTTHREADED);
    loadDefaultFile(pathDefault);
    errChk (RunUserInterface ());
    

Error:
    /* clean up */
    if (panelHandle > 0)
        DiscardPanel (panelHandle);
    if(AttributePanelHandle>0)
        DiscardPanel(AttributePanelHandle);
    return 0;
}

[erraunakgupta]

Hello Roberto,

Today I reinstalled the NIDAQmx software. Now I do not get a delay in executing the CreateTaskHandle function.

I think it might be some installation problem.

Thanks

Raunak