Agilent Technologies E8257D PSG Instrukcja Użytkownika Pobierz pdf (Strona 356)

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344 Agilent N516xA, N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide

Creating and Downloading User–Data Files

Save and Recall Instrument State Files

NOT appended to the block and END is not sent at the conclusion of the

write.*/

static public void WriteFileBlock(uint device, string fileName)

{

// Make sure that the file exists, otherwise sends a null block

if (File.Exists(fileName))

{

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

// Send the definite block header: #{lengthDataLength}{dataLength}

string fileSize = fs.Length.ToString();

string fileSizeLength = fileSize.Length.ToString();

WriteDevice(device, "#" + fileSizeLength + fileSize, false);

// Don't set END at the end of writes

VisaInterop.SetAttribute(device, VisaAttribute.SendEndEnable, 0);

// Write the file block to the signal generator

byte[] readBuf = new byte[TRANSFER_BLOCK_SIZE];

int numRead = 0;

uint retCount = 0;

while ((numRead = fs.Read(readBuf, 0, TRANSFER_BLOCK_SIZE)) != 0)

{

VisaInterop.Write(device, readBuf, (uint)numRead, out retCount);

}

// Go ahead and set END on writes

VisaInterop.SetAttribute(device, VisaAttribute.SendEndEnable, 1);

// Done with file

fs.Close();

}

else

{

// Send an empty definite block

WriteDevice(device, "#10", false);

}

// Declaration of VISA device access constants

public enum VisaAccessMode

{

NoLock = 0,

ExclusiveLock = 1,

SharedLock = 2,

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