Agilent Technologies E5071C User's Guide download pdf (Page 188)

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188 Chapter 12

Sample Application Programs

Controlling Using Telnet Server

Procedures in each step in Figure 12-6 are described below.

Startup

The procedure corresponding to Startup is StartIt (Example 12-8). StartIt launches and

initialize

WinSock API with WSAStartup in WinSock API, whose version is in the

part 1 of Figure 12-5. The function WSAStartup should be always used when initiating

WinSock. This function takes version number (input) and launching information (output)

as its parameters.

Example 12-8 StartIt

Sub StartIt()

Dim StartUpInfo As WSAData

'Version 1.1 (1*256 + 1) = 257

'version 2.0 (2*256 + 0) = 512

'Get WinSock version

Sheets("Sheet1").Select

Range("C2").Select

version = ActiveCell.FormulaR1C1

'Initialize Winsock DLL

x = WSAStartup(version, StartUpInfo)

End Sub

Socket Creation and Connection

The procedure for Socket Creation and Connection is OpenSocket (Example 12-9).

OpenSocket makes a connection to an instrument associated with the IP address specified

with the input parameter Hostname. It uses a socket of the port specified with the input

parameter PortNumber. Each functional part of OpenSocket is described below.

In (1), the inet_aadr function of WinSock API is used to convert an IP address delimited by

“.” to an Internet address.

In (2), a new socket is created with socket function of

WinSock API and its socket

descriptor is obtained. If an error occurs, the control returns to the main program with a

message. socket function takes parameters for an address family (input), a socket type

(input), and a protocol number (input).

In (3), the socket address is specified. Note that htons, which is used for specifying the port

number, is a function of WinSock API. The function converts a 2-byte integer from the

Windows byte order (little endian) to the network byte order (big endian).

In (4), a connection to the

E5061A/E5062A is made using connect function of

WinSock API. If an error occurs, the control returns to the main program with a

message. connect function takes parameters for a socket descriptor (input), a socket

address (input), and size of the socket address (input).

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Agilent Technologies E5071C User's Guide Page 188

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