I am running in circles sice a few hours now. I do have a managed project VC++ in Visual Studio and try to read a thermocouple in this project. The plan is to use the Legacy C-interface. I do not have the Measurement Studio, so I have to figure out how to do that w/o .NET. So therefore I created a unmanaged class handling my thermocouple.
The configuration of the thermocouple channel is done in the constructor and looks as follows:
signed long RetVal = 0;
RetVal = DAQmxCreateTask("TempTask",&taskTempHandle);
RetVal = DAQmxCreateAIThrmcplChan(taskTempHandle,"Dev2/ai0","",-60.0,100.0,DAQmx_Val_DegC,DAQmx_Val_J_Type_TC,DAQmx_Val_BuiltIn,25.0,"");
RetVal = DAQmxCfgSampClkTiming(taskTempHandle,"",10.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,NUM_SAMPLES);
Everything seems to work up to this point, all functions return 0.
Then I am trying to set the Callback for the samples event:
RetVal = DAQmxRegisterEveryNSamplesEvent(taskTempHandle, DAQmx_Val_Acquired_Into_Buffer, NUM_SAMPLES, 0, &Thermocouple::EveryNCallback, NULL);
Compiler Errors:
.\Thermocouple.cpp(13) : error C2664: 'DAQmxRegisterEveryNSamplesEvent' : cannot convert parameter 5 from 'int32 (__cdecl Thermocouple::* )(TaskHandle,int32,uInt32,void *)' to 'DAQmxEveryNSamplesEventCallbackPtr'
There is no context in which this conversion is possible
c:\work\upa\aw system\software\sensor environmental tester\sensor environmental tester\Thermocouple.h(10) : error C3641: 'Thermocouple::EveryNCallback' : invalid calling convention '__cdecl ' for function compiled with /clr:pure or /clr:safe
Build log was saved at "file://c:\work\UPA\AW System\Software\Sensor Environmental Tester\Sensor Environmental Tester\Debug\BuildLog.htm"
Sensor Environmental Tester - 2 error(s), 0 warning(s)
It seems that there two problems and I just can't figure out how to get arround them:
1) The Callback does not work.
2) VS has a problem with CVICALLBACK the callback function, I undefined that in NIdaqMX.h, which solves the problem but I am not sure if this is a good idea
Can anybody help me? Please? I attached what I have so far.
Thanks
