Agilent Technologies E4406A VSA manual Programming Examples, Using C Programming Over Socket LAN

Programming Examples

Using C Programming Over Socket LAN

memcpy(&peeraddr_in.sin_addr.s_addr, hostPtr->h_addr, hostPtr->h_length); peeraddr_in.sin_family = AF_INET;

peeraddr_in.sin_port = htons((unsigned short)portNumber);

if (connect(s, (const struct sockaddr*)&peeraddr_in, sizeof(struct sockaddr_in)) == SOCKET_ERROR)

{

fprintf(stderr,"unable to create socket to ’%s’: %s\n", hostname, strerror(errno));

return INVALID_SOCKET;

}

return s;

}

/***************************************************************************

*

>$Function: commandInstrument$

*

* $Description: send a SCPI command to the instrument.$

*

* $Parameters: $

* (FILE *) . . . . . . . . . file pointer associated with TCP/IP socket.

* (const char *command) . . SCPI command string.

* $Return: (char *) . . . . . . a pointer to the result string.

*

* $Errors: returns 0 if send fails $

*

***************************************************************************/

int commandInstrument(SOCKET sock,

const char *command)

{

int count;

154 Chapter 3