Is the C API of DAQmx compatible cross-platform?

Similar Questions

• Can I synchronize the counters on two different computers in the C API?

  I installed the M-series cards (6254) in several computers. I would like to synchronize the counters for each card.  The best way that I came with to do this was to have the counter on each counter entries read a common external clock signal running at 10 KHz I have would then feed a second signal to each card and trigger the task that runs each counter starts when the second line goes high.

  Following the examples provided with the C API, it was easy to get each card KHz signal and then to match the beginning of the counter that I tried to read

  DAQmxCfgDigEdgeStartTrig (taskHandle, inputLineStr, DAQmx_Val_Rising);

  However, this did not work and gave me the following error:

  DAQmx error: the specified property is not supported by the device or is not applicable to the task.
  
  Property: DAQmx_StartTrig_Type
  
  Task name: task
  State code:-200452
  
  End of the program, press the Enter key to exit
  
  

  I know it's very simple sync the cards within a computer using the RTSI interface, but it is not possible that my cards have to reside in different computers.

  It is even possible to synchronize the counters on computers, and if yes how can I do it with the C API?

  ------------------

  Here's what I've written so far:

  
  
  
  
  #define DAQmxErrChk (functionCall) if (DAQmxFailed (error = (functionCall))) goto error; on the other
  int main (void)
  
  {
  
          int         error = 0;
  
          TaskHandle  taskHandle = 0;
  
          uInt32      data = 0;
  
          tank        errBuff [2048] = {'\0'};
  DAQmxErrChk (DAQmxCreateTask ("task", & taskHandle));
  
          DAQmxErrChk (DAQmxCreateCICountEdgesChan(taskHandle,"/Dev1/ctr0","",DAQmx_Val_Rising,0,DAQmx_Val_CountUp));
  
          DAQmxErrChk (DAQmxConnectTerms ("/ 10MhzRefClock/Dev1", "/ PFI8/Dev1", DAQmx_Val_DoNotInvertPolarity));
  
          DAQmxErrChk (DAQmxCfgDigEdgeStartTrig(taskHandle,"/Dev1/PFI14",DAQmx_Val_Rising));
  DAQmxErrChk (DAQmxStartTask (taskHandle));
  printf ("without interruption of the poll. Press Ctrl + C to interrupt\n");
  
          While {} (1)
  
                  DAQmxErrChk (DAQmxReadCounterScalarU32(taskHandle,10.0,&data,));
  
                  printf ("\rCount: %u", data);
  
                  fflush (stdout);
  
         	}
  
  Error:
  
          puts("");
  
          If (DAQmxFailed (error))
  
                  DAQmxGetExtendedErrorInfo (errBuff, 2048);
  
          If (taskHandle! = 0) {}
  
                  /*********************************************/
  
                  Stop DAQmx code
  
                  /*********************************************/
  
                  DAQmxStopTask (taskHandle);
  
                  DAQmxClearTask (taskHandle);
  
          }
  
          If (DAQmxFailed (error))
  
                  printf ("error DAQmx: %s\n",errBuff); ")
  
          printf ("end of the program, press the Enter key to quit\n");
  
          GetChar ();
  
          return 0;
  
  }
  
  

  Hi neurostu,

  Arms start triggers are disabled by default, so they do not have a default PFI line.

  You will need to set some properties DAQmx to configure a trigger for start of arms. Try adding between DAQmxCreateCICountEdgesChan() and DAQmxStartTask():

  DAQmxSetArmStartTrigType (taskHandle, DAQmx_Val_DigEdge);

  DAQmxSetDigEdgeArmStartTrigSrc (taskHandle, "/ Dev1/PFI14" ');

  DAQmxSetDigEdgeArmStartTrigEdge (taskHandle, DAQmx_Val_Rising);

  You have the file "help NOR-DAQmx C reference"? It should contain descriptions of the trigger > more > arm Start properties.

  Brad

• How to set the clock as a Digital Out Signal in the C API?

  My problem is simple, I'm looking for a way get the my device of the series E clock signal (6254) to a digital camera offline. Is it possible to do in the C API? If yes are there docs everywhere where show me how do?

  Hi neurostu,

  Yes, there is a way. The function is called DAQmxConnectTerms. "" "" "You can find the definition of the function in Start ' programs ' National Instruments ' NOR-DAQ' text Code support" using NOR-DAQmx C reference. "" "On the left, select OR DAQmx C functions" advanced"routing of the Signal'. DAQmxConnectTerms

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• x 64 (64-bit) bug in the C API

  I try to get the C API of 64-bit running.  I have the 32-bit running API, and it is not working properly.  It seems that no API call in the 64-bit environment, which returns more than a single data type replaces a box of memory it does not.

  I work in VB.NET and enveloping with a marshaling calls.  The simplest example of a call that is not working properly is querying the active channels on the scope:

  C header:

  niVB_Status NIVB_DECL (niVB_MSO_QueryEnabledAnalogChannels)
  niVB_MSO_InstrumentHandle instrumentHandle,
  char * channels.
  size_t channelsSize,
  size_t * channelsSizeOut);

  There are several different ways to encode a managed, unmanaged for this translation.  First is to use an allocation to build a pointer on a buffer zone:

  Pointer = Marshal.AllocHGlobal (MAX_CSTRING_LENGTH)

  Then, the declaration looks like this:

  _
  Public Shared Function niVB_MSO_QueryEnabledAnalogChannels_64 (ByVal instrumentHandle As Integer, ByVal channel As Integer, ByVal channelsSize As UInteger, ByRef channelsSizeOut As UInteger) as niVB_Status
  End Function

  When the call is made, the call to channelsSizeOut returns 23 characters (which is correct).  Channels IntPtr is however cancelled (this should never happen, he suggests that the battery is getting damaged.)  If I put a very wide range locally around the pointer, sometimes it is not damaged.

  Or you can call the function by using a call to stringbuilder.  Basically, it replaces the IntPtr parameter with a string generator using marshaling for a pointer:

  Dim bufChannels As New StringBuilder (MAX_CSTRING_LENGTH)

  then the call looks like this:

  _
  Public Shared Function niVB_MSO_QueryEnabledAnalogChannels_64 (ByVal instrumentHandle As IntPtr, ByVal channel As StringBuilder, ByVal channelsSize As UInteger, ByRef channelsSizeOut As UInteger) as niVB_Status
  End Function

  Yet once, calling this function causes the stringbuilder class being together (Nothing), which is essentially showing that stack space where is the pointer to the StringBuilder is getting damaged.

  It is important to note that this code works perfectly with the 32-bit version of the DLL (with a programming construct).

  I don't think it's a bug in the C API; I can do the following for both x 86 and x 64 without triggering of MSVC stack Canaries. (Note that for brevity, it does no checking error in this code snippet.)

  #include
  #include
  #include ' nivirtualbench/nivirtualbench.h '.

  int main (int argc, char * argv)

  {

  niVB_LibraryHandle libHandle = NULL;

  niVB_MSO_InstrumentHandle msoHandle = NULL;

  size_t channelsSizeOut = 0;

  char * enabledChannels = NULL;

  niVB_Initialize (NIVB_LIBRARY_VERSION & libHandle);

  niVB_MSO_Initialize (libHandle, "brandonbench", false, & msoHandle);

  niVB_MSO_QueryEnabledAnalogChannels (msoHandle, NULL, 0, & channelsSizeOut);

  enabledChannels = (char *) calloc (channelsSizeOut, sizeof;

  niVB_MSO_QueryEnabledAnalogChannels (msoHandle, enabledChannels, channelsSizeOut, & channelsSizeOut);

  printf ("permit to channels: %s\n", enabledChannels);

  Free (enabledChannels);

  niVB_MSO_Close (msoHandle);

  niVB_Finalize (libHandle);

  }

  I suspect that the problem is in your marshaling. Size_t parameters are probably better represented using System.UIntPtr and not the type UInteger; size_t is 32-bit on 32-bit platform and 64 bits on 64-bit platforms, but UIntegers are 32-bit at a time. Try to write channelsSizeOut, it's probably what is triggering the corruption of the stack.

• How to use the Teststand API DisplayEditNumericFormatDialog method

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  Locals.Local.AsPropertyObject.DisplayEditNumericFormatDialog ("false title", False, 0)

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  Kind regards

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  Thank you

  Sébastien

  Thank you for your response.

  My problem is that we work with very small insects and the shape/color is the same for all.

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