Agilent Technologies N5183A MXG, N5181A/82A, E8663B manual 332

Creating and Downloading User-Data Files

Save and Recall Instrument State Files

string retValue = "";

byte[] buf = new byte[MAX_READ_DEVICE_STRING]; // 1024 bytes maximum read uint retCount;

if (VisaInterop.Read(device, buf, (uint)buf.Length -1, out retCount) == 0)

{

retValue = Encoding.ASCII.GetString(buf, 0, (int)retCount);

}

return retValue;

}

/* The following method reads a SCPI definite block from the signal generator and writes the contents to a file on your computer. The trailing

newline character is NOT consumed by the read.*/

static public void ReadFileBlock(uint device, string fileName)

{

// Create the new, empty data file.

FileStream fs = new FileStream(fileName, FileMode.Create);

//Read the definite block header: #{lengthDataLength}{dataLength} uint retCount = 0;

byte[] buf = new byte[10]; VisaInterop.Read(device, buf, 2, out retCount); VisaInterop.Read(device, buf, (uint)(buf[1]-'0'), out retCount);

uint fileSize = UInt32.Parse(Encoding.ASCII.GetString(buf, 0, (int)retCount));

//Read the file block from the signal generator

byte[] readBuf = new byte[TRANSFER_BLOCK_SIZE]; uint bytesRemaining = fileSize;

while (bytesRemaining != 0)

{

uint bytesToRead = (bytesRemaining < TRANSFER_BLOCK_SIZE) ? bytesRemaining : TRANSFER_BLOCK_SIZE; VisaInterop.Read(device, readBuf, bytesToRead, out retCount); fs.Write(readBuf, 0, (int)retCount);

bytesRemaining -= retCount;

}

//Done with file fs.Close();

}

/* The following method writes the contents of the specified file to the specified file in the form of a SCPI definite block. A newline is

332 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide