/*write data to file*/
int CVICALLBACK DAQThread(void *functionData)
{
....
//tpTyroProject->EnabledChNum the number of aquired channels
//tpTyroProject->Acq.BufferSize buffer of every aquired channel
buffSize=tpTyroProject->EnabledChNum*tpTyroProject->Acq.BufferSize;
if ((pBuffer = (double*)malloc(buffSize*sizeof(double)))==NULL)
return -1;
datFileHdl = OpenFile ("data.bin", VAL_WRITE_ONLY, VAL_APPEND, VAL_BINARY);
/* Acquire data indefinitely into circular buffer */
iStatus = AIStartAcquisition (iDevice, AcqChLabel,buffSize*sizeof(double) ,
tpTyroProject->Acq.AcqRate, 0.0, 0.0, &dActScanRate, &taskId);
/* Main loop that reads data from the buffer */
while ((iLoopCount*buffSize/4Acq.AcqLength*tpTyroProject->EnabledChNum)
&&(iStatus==0)&& (!daqStopFlag))
{
/* Checks the backlog in the buffer */
iStatus = AICheckAcquisition (taskId, &scanBkLog);
if ((scanBkLog >= buffSize/4) && (iStatus == 0))
{
/* Transfers data from the double-buffer */
iStatus = AIReadAcquisition (taskId,tpTyroProject->Acq.BufferSize/4 ,
CONSECUTIVE_MODE,&scanBkLog, GROUP_BY_SCAN, pBuffer);
WriteFile (datFileHdl,(char *)pBuffer ,sizeof(double)*buffSize/4 );
iLoopCount++;
....
}
ProcessSystemEvents();
}
....
free(pBuffer);
}
/*read data from file*/
double arr[100] ;//globle variable
int CVICALLBACK opnFile (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
....
fileHdl = OpenFile (pathName, VAL_READ_ONLY, VAL_OPEN_AS_IS, VAL_BINARY);
SetCtrlAttribute (panel, PANEL_TIMER, ATTR_ENABLED, 1);//Enable timer
....
}
int CVICALLBACK timerTick (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
...
ReadFile(fileHdl,(char*)arr,100*sizeof(double));
plot = PlotY (panelHandle, PANEL_GRAPH, arr, 100, VAL_DOUBLE,
VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, VAL_RED);
...
}
I got wrong result from the graph when I run my program to read data from "data.bin",anyone help me!
thanks a lot
