因为写的上一篇NI数据采集卡的程序有人留言说想要实现多路数据的同时采集，我没有及时回复，深感抱歉，在此写一篇关于NI数据采集卡的多路数据同时采集的程序
第一个程序实现的功能：六路数据同时采集，采集有限个数据，并且保存到txt文档中。采用的是参考单端接地的方式，参考单端接地指的是我们测量的每一路的值是该路相对AI GND的电压值。对参考单端接地不了解的话可以看NI-DAQmx C Reference help
不多说，上程序。
1 #include <stdio.h>
2 #include "NIDAQmx.h"
3 #pragma comment(lib,"NIDAQmx.lib")
4 #include<iostream>
5 using namespace std;
6
7 #define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else
8
9 int main(void)
10 {
11 int32 error=0;
12 int32 per_num;
13 float64 data[6000];
14 TaskHandle taskHandle=0;
15 char errBuff[2048]={'\0'};
16 DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
17 DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandle,"Dev2/ai0:5","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));
18 DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"",20000,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));
19
20 DAQmxErrChk (DAQmxSetAITermCfg(taskHandle,"Dev2/ai0:5",DAQmx_Val_RSE));
21 //DAQmxErrChk (DAQmxRegisterEveryNSamplesEvent(taskHandle,DAQmx_Val_Acquired_Into_Buffer,PER_NUM0,0,EveryNCallback,this));
22 //DAQmxErrChk (DAQmxRegisterDoneEvent(taskHandle,0,DoneCallback,NULL));
23
24 /*********************************************/
25 // DAQmx Start Code
26 /*********************************************/
27 DAQmxErrChk (DAQmxStartTask(taskHandle));
28 DAQmxErrChk(DAQmxReadAnalogF64(taskHandle,1000,10.0,DAQmx_Val_GroupByScanNumber,data,6000,&per_num,NULL));
29 FILE *fp1=fopen("data1.txt","w+");
30
31 for(int l=0;l<6000;l++)
32 {
33 fprintf(fp1,"%f",data[l]);
34 fputc('\n',fp1);
35 }
36 fclose(fp1);
37 Error:
38 if( DAQmxFailed(error) )
39 DAQmxGetExtendedErrorInfo(errBuff,2048);
40 if( taskHandle!=0 ) {
41 /*********************************************/
42 // DAQmx Stop Code
43 /*********************************************/
44 DAQmxStopTask(taskHandle);
45 DAQmxClearTask(taskHandle);
46 }
47 if( DAQmxFailed(error) )
48 printf("DAQmx Error: %s\n",errBuff);
49 printf("End of program, press Enter key to quit\n");
50 getchar();
51 return 0;
52 }
这个程序实测过，可以使用，希望能够对大家有帮助。
第二个程序实现的功能是对多路数据进行实时连续的采集与保存，采用的也是参考单端接地的方式。程序如下：
1 #include <stdio.h>
2 #include "NIDAQmx.h"
3 #pragma comment(lib,"NIDAQmx.lib")
4 #include<iostream>
5 using namespace std;
6
7 #define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else
8
9 int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData);
10 int32 CVICALLBACK DoneCallback(TaskHandle taskHandle, int32 status, void *callbackData);
11
12 float64 data[6000];
13
14 int main(void)
15 {
16 int32 error=0;
17 TaskHandle taskHandle=0;
18 char errBuff[2048]={'\0'};
19
20 /*********************************************/
21 // DAQmx Configure Code
22 /*********************************************/
23 DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
24 DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandle,"Dev2/ai0:5","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));
25 DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"",1000,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));
26
27 DAQmxErrChk (DAQmxSetAITermCfg(taskHandle,"Dev2/ai0:5",DAQmx_Val_RSE));
28 DAQmxErrChk (DAQmxRegisterEveryNSamplesEvent(taskHandle,DAQmx_Val_Acquired_Into_Buffer,1000,0,EveryNCallback,NULL));
29 DAQmxErrChk (DAQmxRegisterDoneEvent(taskHandle,0,DoneCallback,NULL));
30
31 /*********************************************/
32 // DAQmx Start Code
33 /*********************************************/
34 DAQmxErrChk (DAQmxStartTask(taskHandle));
35
36 printf("Acquiring samples continuously. Press Enter to interrupt\n");
37 getchar();
38 Error:
39 if( DAQmxFailed(error) )
40 DAQmxGetExtendedErrorInfo(errBuff,2048);
41 if( taskHandle!=0 ) {
42 /*********************************************/
43 // DAQmx Stop Code
44 /*********************************************/
45 DAQmxStopTask(taskHandle);
46 DAQmxClearTask(taskHandle);
47 }
48 if( DAQmxFailed(error) )
49 printf("DAQmx Error: %s\n",errBuff);
50 printf("End of program, press Enter key to quit\n");
51 getchar();
52 return 0;
53 }
54
55 int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)
56 {
57 int32 error=0;
58 char errBuff[2048]={'\0'};
59 static int totalRead=0;
60 int32 read=0;
61 float64 dddd=0.001;
62 //float64 data[6000],last=0;
63
64 /*********************************************/
65 // DAQmx Read Code
66 /*********************************************/
67 DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,1000,10.0,DAQmx_Val_GroupByScanNumber,data,6000,&read,NULL));
68 if( read>0 ) {
69 for(int i=0;i<6000;i=i+6)
70 {
71 cout<<data[i]<<endl;
72 }
73 FILE *fp2=fopen("data2.txt","w+");
74 for(int l=0;l<6000;l++)
75 {
76 fprintf(fp2,"%f",data[l]);
77 fputc(',',fp2);
78 fprintf(fp2,"%f",dddd*l);
79 fputc('\n',fp2);
80 }
81 fclose(fp2);
82 }
83
84 Error:
85 if( DAQmxFailed(error) ) {
86 DAQmxGetExtendedErrorInfo(errBuff,2048);
87 /*********************************************/
88 // DAQmx Stop Code
89 /*********************************************/
90 DAQmxStopTask(taskHandle);
91 DAQmxClearTask(taskHandle);
92 printf("DAQmx Error: %s\n",errBuff);
93 }
94 return 0;
95 }
96
97 int32 CVICALLBACK DoneCallback(TaskHandle taskHandle, int32 status, void *callbackData)
98 {
99 int32 error=0;
100 char errBuff[2048]={'\0'};
101
102 // Check to see if an error stopped the task.
103 DAQmxErrChk (status);
104
105 Error:
106 if( DAQmxFailed(error) ) {
107 DAQmxGetExtendedErrorInfo(errBuff,2048);
108 DAQmxClearTask(taskHandle);
109 printf("DAQmx Error: %s\n",errBuff);
110 }
111 return 0;
112 }
这个程序也实际测试过，可以运行，希望这两个程序能对大家有帮助，谢谢观看，有问题请留言。