dmm.zip_DMM驱动_ni 万用表驱动_万用表_万用表C++_数字万用表

// dmm.cpp : 定义 DLL 应用程序的导出函数。 // #include "stdafx.h" #include "nidmm.h" #include <stdio.h> #include <string.h> #include <malloc.h> #include "windows.h" #include <process.h> bool StopMeas = false; typedef void(_stdcall*CallBackFn)(int); CallBackFn CSharp_INT = NULL; HANDLE r_thread=NULL; DWORD exitCode1 = 0; HWND r_hWnd; DWORD r_ThreadId = 0; #define MAXPTSTOREAD 10 /*- Variables definition --------------------------------------------------*/ ViChar resourceName[256] = "PXI1Slot3"; ViSession vi = VI_NULL; ViBoolean idQuery = VI_TRUE; ViBoolean reset = VI_TRUE; ViStatus error = VI_SUCCESS; ViBoolean isOverRange = VI_FALSE; ViInt32 measurementType = NIDMM_VAL_DC_VOLTS; ViReal64 powerlineFreq = NIDMM_VAL_60_HERTZ; ViReal64 range =10.00; ViReal64 coercedRange =10.00; ViReal64 resolution = 5.5; ViInt32 numOfMeas = 0; ViReal64 measurements[MAXPTSTOREAD]; ViReal64 average = 0.00; ViReal64 sum_meas = 0.00; ViReal64 reading = 0.000;//电阻 ViInt32 numPointsRead; ViInt32 i = 0; ViInt32 ptsAvailable = 0; ViInt16 acqDone = 0; //bool Read_Resistence(ViInt32 _measurementType,ViReal64 _range,ViReal64 _resolution); bool CheckErrFunc(ViStatus Func) { if(Func<0) return false; else return true; } extern "C" _declspec(dllexport) int Init_DMM(CallBackFn cbfn) { CSharp_INT=cbfn; return niDMM_init(resourceName, idQuery, reset, &vi); } DWORD WINAPI ThreadFun(PVOID lp) { StopMeas = false; while(!StopMeas) { switch((int)measurementType) { case IVIDMM_VAL_DC_VOLTS: ptsAvailable = 0; if(!CheckErrFunc(niDMM_ReadStatus(vi, &ptsAvailable, &acqDone))) break; ptsAvailable = ptsAvailable < MAXPTSTOREAD ? ptsAvailable : MAXPTSTOREAD; if (ptsAvailable) { if(!CheckErrFunc(niDMM_FetchMultiPoint(vi, NIDMM_VAL_TIME_LIMIT_AUTO, ptsAvailable, measurements, &numPointsRead))) break; sum_meas=0; for (i=0; i<numPointsRead; i++) sum_meas = sum_meas + measurements[i]; average = sum_meas/numPointsRead; niDMM_GetAttributeViReal64 (vi, "", NIDMM_ATTR_AUTO_RANGE_VALUE, &coercedRange); //use the data here! CSharp_INT(coercedRange); if(numOfMeas >= 10000*MAXPTSTOREAD) StopMeas = VI_TRUE; Sleep(100); } break; case IVIDMM_VAL_AC_VOLTS: if(!CheckErrFunc(niDMM_Read (vi, NIDMM_VAL_TIME_LIMIT_AUTO, &reading))) break; CSharp_INT(reading); break; case IVIDMM_VAL_2_WIRE_RES: case IVIDMM_VAL_4_WIRE_RES: if(!CheckErrFunc(niDMM_Read(vi,NIDMM_VAL_TIME_LIMIT_AUTO,&reading))) break; if(!CheckErrFunc(niDMM_IsOverRange(vi, reading, &isOverRange))) break; if(!(reading>0)&&(range<100)) { range=10*range; if(!CheckErrFunc(niDMM_ConfigureMeasurementDigits(vi, measurementType,range, resolution))) return false; } else CSharp_INT(reading); break; } } return 0; } extern "C" _declspec(dllexport) int Read_DC_Volt(ViInt32 _measurementType,ViReal64 _range,ViReal64 _resolution) { _measurementType=NIDMM_VAL_DC_VOLTS; measurementType=NIDMM_VAL_DC_VOLTS; /*- Configure Measurement -------------------------------------------*/ if(!CheckErrFunc(niDMM_ConfigureMeasurementDigits (vi, _measurementType, _range, _resolution))); // return 2; /*- Configure a Multipoint Acquisition ------------------------------*/ if(!CheckErrFunc(niDMM_ConfigureMultiPoint (vi, 1, 0, NIDMM_VAL_IMMEDIATE, 0.0))); // return 3; /*- Configure Powerline frequency -----------------------------------*/ if(!CheckErrFunc(niDMM_ConfigurePowerLineFrequency (vi, powerlineFreq))); // return 4; /*- Start or Initiate the Acquisition -------------------------------*/ if(!CheckErrFunc(niDMM_Initiate (vi))); // return 5; if(r_thread==NULL) { r_thread=CreateThread(NULL,0,ThreadFun,(LPVOID)_measurementType,0,NULL); return true; } else { } } } extern "C" _declspec(dllexport) int Read_AC_Volt(ViInt32 _measurementType,ViReal64 _range,ViReal64 _resolution) { _measurementType = IVIDMM_VAL_AC_VOLTS; measurementType=IVIDMM_VAL_AC_VOLTS; if(!CheckErrFunc(niDMM_ConfigureMeasurementDigits(vi, _measurementType, _range, _resolution))); // return 2; if(!CheckErrFunc(niDMM_ConfigureACBandwidth (vi, 20, 25000))); // return 3; if(r_thread==NULL) { r_thread= CreateThread(NULL,0,ThreadFun,(LPVOID)_measurementType,0,NULL); return true; } else { } } extern "C" _declspec(dllexport) int Read_Resistence(ViInt32 _measurementType,ViReal64 _range,ViReal64 _resolution) { if(_measurementType ==5) _measurementType =IVIDMM_VAL_2_WIRE_RES; else if (_measurementType ==101) _measurementType =IVIDMM_VAL_4_WIRE_RES; if(!CheckErrFunc(niDMM_ConfigurePowerLineFrequency (vi, powerlineFreq))) return 3; if(!CheckErrFunc(niDMM_ConfigureMeasurementDigits(vi, _measurementType, _range, _resolution))) return 4; if(r_thread==NULL) { r_thread=CreateThread(NULL,0,ThreadFun,(LPVOID)_measurementType,0,NULL); break; } else { } } return 1; } extern "C" _declspec(dllexport) int Close_DMM() { if(!StopMeas) StopMeas=true; if(r_thread!=NULL) CloseHandle(r_thread); if(vi) niDMM_close(vi); return 1; }