A run-time-error, how to fix

"I write a function to return a pointer of type float64 and assign the pointer to my defined Pionter 'newdata' in my StartCallBack, there is no error, but when I USE"

DAQmxWriteAnalogF64 (gtaskhandle0, leng [0])<=leng[1]?2*leng[0]:2*leng[1], 0,="" 10.0,="" daqmx_val_groupbyscannumber,="" newdata,="" &written,="">

I receive a run-time-error like this: "work.c", line 231, col 121, id thread 0x00007FB4: Array too small argument (40000000 bytes).  Argument must contain at least 80000000 bytes (10000000 items). Why does this happen?

My part code:

DAQmxCreateTask ("", & gtaskhandle0 ");
DAQmxCreateAOVoltageChan (gtaskhandle0, ' Dev1 / ao0:1 ', ' ',-10,0, 10.0, DAQmx_Val_Volts, "");
DAQmxSetTimingAttribute (gtaskhandle0, DAQmx_SampClk_Rate, 1000/looptime);
DAQmxCfgSampClkTiming(gtaskhandle0,"",1000/looptime,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,leng[0]+leng[1]);
DAQmxRegisterDoneEvent(gtaskhandle0,0,DoneCallback,);
DAQmxWriteAnalogF64 (gtaskhandle0, leng [0])<=leng[1]?2*leng[0]:2*leng[1], 0,="" 10.0,="" daqmx_val_groupbychannel,="" newdata,="" &written,="">
SetCtrlAttribute (panelHandle, PANEL_REALWRITE, ATTR_CTRL_VAL, (double) written);
DAQmxStartTask (gtaskhandle0);

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From the code, we cannot see how many samples do you expect to write but there are two aspects to consider.

DAQmxWriteAnalogF64 expects to receive the number of samples per channel to write; in other words, your "2 *" in the function call is probably wrong. See here for the function. This can cause the error you receive, because the length of the array does not match the settings (you probably want to write 5 million samples per channel).

Second aspect, it seems to me that your function is the production of the final table with samples interleaved (i.e. array1 [0], array2 [0], array array1 [1], array2 [1]... [n-1] array1, array2 [n-1]). If this is true, you must pass the DAQmx_Val_GroupByScanNumber in the function call.

Tags: NI Software

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