DSA815 DSA800 series programming guide

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Chapter 3 Programming Demos RIGOL

DSA800 Programming Guide 3-7

//Close the system

status = viClose(instr);

status = viClose(defaultRM);

return bWriteOK;

}

2) Encapsulate the read operation of VISA for easier operation.

bool CDemoForDSADlg::InstrRead(CString strAddr, CString *pstrResult) //Read operation

{

ViSession defaultRM,instr;

ViStatus status;

ViUInt32 retCount;

char * SendAddr = NULL;

unsigned char RecBuf[MAX_REC_SIZE];

bool bReadOK = false;

CString str;

// Change the address's data style from CString to char*

SendAddr = strAddr.GetBuffer(strAddr.GetLength());

strcpy(SendAddr,strAddr);

strAddr.ReleaseBuffer();

memset(RecBuf,0,MAX_REC_SIZE);

//Open a VISA resource

status = viOpenDefaultRM(&defaultRM);

if (status < VI_SUCCESS)

{

// Error Initializing VISA...exiting

AfxMessageBox("No VISA resource was opened!");

return false;

}

//Open the instrument

status = viOpen(defaultRM, SendAddr, VI_NULL, VI_NULL, &instr);

//Read from the instrument

status = viRead(instr, RecBuf, MAX_REC_SIZE, &retCount);

//close the system

status = viClose(instr);

status = viClose(defaultRM);

(*pstrResult).Format("%s",RecBuf);

return bReadOK;

}

3) Encapsulate the the read operation with exception handling function of VISA.

ViStatus CDemoForDSADlg::OpenVisaDevice(CString strAddr) //Open a VISA device

{