数据采集与显示，存储问题

Question

我现在需要做一个数据采集，存储以及实时显示的程序。我在窗口的onstarttracking button的触发事件中设置硬件链接，程序如下：void DataCollectionWin::OnStartTracking() 
{
.....
     DAQmxErrChk(DAQmxCreateTask ("", &taskHandle));
     DAQmxErrChk(DAQmxCreateAIVoltageChan(taskHandle,"Dev1/ai0,Dev1/ai1,Dev1/ai2,Dev1/ai3,Dev1/ai4,Dev1 /ai5,","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));//和设备的输出端口进行链接
    DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"",10000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));     DAQmxErrChk (DAQmxRegisterEveryNSamplesEvent(taskHandle,DAQmx_Val_Acquired_Into_Buffer,1000,0,EveryNCallback,NULL));//用EveryNCallback 事件进行连续数据采集      DAQmxErrChk (DAQmxRegisterDoneEvent(taskHandle,0,DoneCallback,NULL));     DAQmxErrChk (DAQmxStartTask(taskHandle));//开始执行AfxBeginThread( FillTrackingTable,m_trackinglist,THREAD_PRIORITY_NORMAL, 0, 0 );//执行线程将数据显示在窗口listcontrol 对象中
AfxBeginThread( FillTrackingExlFile,m_trackinglist,THREAD_PRIORITY_NORMAL, 0, 0 );//执行线程将数据存入exl文件中
....
}EveryNCallback为全局函数，定义如下：
int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)
{//EnterCriticalSection(&g_cs);
DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,1000,10.0,DAQmx_Val_GroupByScanNumber,optdata,6000,&read,NULL));//数据存入全局变量data中
//LeaveCriticalSection(&g_cs);Error:
if( DAQmxFailed(error) ) {
DAQmxGetExtendedErrorInfo(errBuff,2048);

DAQmxStopTask(taskHandle);
DAQmxClearTask(taskHandle);
 AfxMessageBox(errBuff);
}
return 0;}全局变量data声明为： float64     optdata[6000];现在问题是如何在实时改写optdata的时候，如何在线程FillTrackingTable和FillTrackingExlFile中调用？我试过用criticalsection,但是好像没用。程序发生异常关闭。请高手指点。

Answer 1

to wangzhi2003:
[email protected]

Answer 2

定义两个event对象，在EveryNCallback内激活，在FillTrackingTable和FillTrackingExlFile回调函数内WaitForSingleObject

Answer 3

to ilovedrv:
谢谢。等我来试一下。

Answer 4

有点不明白。“定义两个event对象，在EveryNCallback内激活,"我是应该这样写么：int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)
{ 
hEvent = CreateEvent(NULL, FALSE, FALSE, NULL); //应该在这里产生事件么？还是应该放在主进程DataCollectionWin::OnStartTracking() 中？？？？SetEvent(hEvent);DAQmxErrChk (DAQmxReadAnalogF64(taskHandle,1000,10.0,DAQmx_Val_GroupByScanNumber,data,6000,&read,NULL));。。}
 
UINT FillTrackingTable(LPVOID pParam)
{
WaitForSingleObject(hEvent,INFINITE);
  memcpy(opticaldata,data,6000);//将数据存入局部变量opticaldata
  SetEvent(hEvent);。}很迷惑。请指点一下。

Answer 5

Event = CreateEvent(NULL, FALSE, FALSE, NULL);
  内核事件创建放到进程初始化的时候，先创建好，然后FillTrackingTable和FillTrackingExlFile 就可以等待event了EveryNCallback 中再SetEvent来触发