problems with data type

[siul82mx]

Hi everybody I have a problem with respect the data Type.I read some attributes from my device but the problem comes when I want to show them on the pront panel of the user interface because the commands need a diferente type of values. For example when i use this function:  viGetAttribute (instrument, VI_ATTR_USB_BULK_OUT_PIPE, &bulkoutpipe); i can only put the name of the variable that i will use to save the value of the data, and by default this variable is an integer (teh program uses ViInt16) and till here is ok, i got the value from my device with any problem, but now the next step is display this value on the user interface using a text box and i have to use the next command:      InsertListItem (panelHandle, PANEL_CONFIG, 1, bulkoutpipe, bulkoutpipe); but here by default the variable to show is a character array and i can not select another type of variable, so when i run the program i got the message error that says: Type error in argument 4 to 'InsertListItem';found 'ViInt16' expected 'pointer to const char'

Here is the code in the function where i have the problem:

int CVICALLBACK GetConfig (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
// char bulkoutpipe[256];
 ViInt16 bulkoutpipe;
 ViChar name[256];
 unsigned char idnresult[72];
 ViUInt32 retcount;
 
 switch (event)
  {
  case EVENT_COMMIT:
    DeleteListItem (panelHandle, PANEL_CONFIG, 0, -1);
    viGetAttribute (instrument, VI_ATTR_RSRC_NAME, name);
       InsertListItem (panelHandle, PANEL_CONFIG, 0, name, 0);
    viGetAttribute (instrument, VI_ATTR_USB_BULK_OUT_PIPE, &bulkoutpipe);
  
  
  //  viGetAttribute (instrument, VI_ATTR_USB_BULK_IN_PIPE, &bulkinpipe);
    InsertListItem (panelHandle, PANEL_CONFIG, 1, bulkoutpipe, bulkoutpipe);
   
   
    //viGetAttribute (instrument, VI_ATTR_USB_BULK_IN_PIPE, &bulkinpipe[0]);
          
   
  //  viWrite (instrument, "*IDN?\n", 6, &retcount);
  //  viRead (instrument, idnresult, 72, &retcount);
  //  InsertListItem (panelHandle, PANEL_CONFIG, 1, idnresult, 0);
      
    SetCtrlAttribute (panelHandle, PANEL_SAVE, ATTR_DIMMED, 1); //enable the button SAVE 

   break;
  case EVENT_RIGHT_CLICK:

   break;
  }
 return 0;
}

I hope and someone can help me. Thanks , bye

[MartyMcDAX]

Hello siul82mx,

To convert your ViInt16 to a string, you can use the sprintf C function.  This function can be used to insert various data types including integers into a string.  Below is an example of how you would call this function.  The quoted text is simply added to the string.  The %d is used to inform the function that I am inserting an integer, rather than a floating point, character, pointer address, etc.  The variable bulkOutPipe is then used to specify the integer I am inserting into the string.  You can have multiple variable insertions in one function call if you like.


    // Declare variables
    ViInt16 bulkOutPipe;
    char bulkOutPipeString [50];
    
    // Assign bulkOutPipe value
    ...
    
    // Add value to string
    sprintf(bulkOutPipeString, "Here is my ViInt value in a string: %d", bulkOutPipe);
            
            
There are many additional resources for this function online, as in this website:
http://www.cplusplus.com/reference/clibrary/cstdio/sprintf.html

I hope that helps!

[siul82mx]

Thanks your last advice was very helfull for my program

Now i have another problem may be you can help me. I am sending data from my USB RAW and i want to enable the USB interrupt with visa commands in order that when there is an interrupt my program in CVI gets the values from the USB.

i have tryed in diferent ways but always i got an error setup on the function, and the programm dos not run.I have read the only example that is on the user manual but i have still the problem, i have declarated my funciton, installed the handler, but when i want to eneble the VI_EVENT_USB_INT is when the problem appears, the error code says :

ViEnableEvent : Unable to start operation because setup is invalid (due to attributes being set to an inconsistent state)

The code that i am using is the next:

//headers files

static unsigned char FF6[513];
static ViStatus status;
static ViSession defaultRM;
static ViSession instrument;
static ViObject instrument;   
static int panelHandle;
static int start=0; 

static ViBuf Userhandle;
static ViEvent eventContext;
static ViUInt32 retcount; 
static ViEventType etype; 

//USB int event handler
ViStatus _VI_FUNCH myCallback(ViSession instrument, ViEventType etype, ViEvent eventContext, ViAddr UserHandle)
{
//printf("hola");
//ViUInt32 retcount;
//ViJobId jobID;
//ViUInt16 stb;
//status = viReadSTB (instrument, &stb);
//status = viReadSTB(vi, &stb);
//status = viReadAsync(vi,(ViBuf)UserHandle,512,&jobID);

status = viRead (instrument, FF6, 512, &retcount);      //read the values of fifo6
  

return VI_SUCCESS;
}

int main (int argc, char *argv[])
{
// ViBuf Userhandle;
// ViEvent eventContext;
// ViEventType etype;

 if (InitCVIRTE (0, argv, 0) == 0)
  return -1; /* out of memory */
 if ((panelHandle = LoadPanel (0, "usb.uir", PANEL)) < 0)
  return -1;

 status = viOpenDefaultRM (&defaultRM);   //we open the Resource Manager
 if (status < VI_SUCCESS)      /*Check if we have an Error Initializing VISA...exiting*/
  return -1;
    status = viOpen (defaultRM, "USB0::0x04B4::0x1002::NI-VISA-0::RAW", VI_NULL, VI_NULL, &instrument); //we open the communication with our instrument
 if (status < VI_SUCCESS)      /*Check if we have an Error Initializing instrument...exiting*/
  return -1;
 viFlush (instrument, VI_WRITE_BUF_DISCARD);
 viFlush (instrument, VI_READ_BUF_DISCARD);
 
 Userhandle = (ViBuf)malloc(512);
 status = viInstallHandler (instrument, VI_EVENT_USB_INTR, myCallback, Userhandle);
 if (status < VI_SUCCESS)      /*Check if we have an Error to istall the handler for the USB INT */
  return -1;
 
 status = viEnableEvent (instrument, VI_EVENT_USB_INTR, VI_HNDLR, VI_NULL);
 if (status < VI_SUCCESS)      /*Check if we have an Error to istall the handler for the USB INT ************************** Here is the problem ***************************/
  return -1;

 DisplayPanel (panelHandle);
 RunUserInterface ();
 DiscardPanel (panelHandle);
 

 return 0;
}

I hope you can indentify where is my mistake, also i would like to know if you can send me and example using events, that will be very usefull for me, Thanks

[MartyMcDAX]

Hello siul82mx,

I see that this question is a duplicate post to this forum: how to configure an event

We like to keep separate issues in separate forums, so please refer to the linked forum for future posts regarding this issue.

Thanks!

[siul82mx]

Ok , so you mean i have to wait more time for the support , anyway thanks for your help, bye