User manual

Chapter 4 Programming Examples RIGOL
DG800 Programming Guide 4-21
5. Click ViewClassWizard and add the control variables in the Member Variables tab in the pop-up
interface.
Instrument address: CString m_strInstrAddr
Command CString m_strCommand
Returned value CString m_strResult
6. Encapsulate the read and write operations of VISA.
1) Encapsulate the write operation of VISA for easier operation.
bool CDG800_Demo_VCDlg::InstrWrite(CString strAddr, CString strContent) //write function
{
ViSession defaultRM,instr;
ViStatus status;
ViUInt32 retCount;
char * SendBuf = NULL;
char * SendAddr = NULL;
bool bWriteOK = false;
CString str;
//Change the address's data style from CString to char*
SendAddr = strAddr.GetBuffer(strAddr.GetLength());
strcpy(SendAddr,strAddr);
strAddr.ReleaseBuffer();
//Change the command's data style from CString to char*
SendBuf = strContent.GetBuffer(strContent.GetLength());
strcpy(SendBuf,strContent);
strContent.ReleaseBuffer();
//open the VISA instrument
status = viOpenDefaultRM(&defaultRM);
if (status < VI_SUCCESS)
{
AfxMessageBox("No VISA instrument was opened !");