Yokogawa DR240 - Manual (Page 112)

8-14 IM DR231-11E
57 WSACleanup();
58 }
59 }
60
61
int recv_msg(SOCKET so, char *msg, char *buf, int max) {
62
63
int sum = 0;
64 int len;
65 int pos;
66
67
for(;;) {
68
69
len = recv(so, &buf[sum], max - sum, 0);
70
71
if(len == SOCKET_ERROR || len == 0)
72 return(len);
73
74
sum += len;
75
76
buf[sum] = ‘\0’;
77
78
if(buf[sum-1] != ‘\n’)
79 continue;
80
81
for(pos = sum-1; pos > 0; pos—) {
82
83
if(buf[pos-1] == ‘\n’)
84 break;
85 }
86
87
if(!strcmp(msg, “TS0”) || !strcmp(msg, “\x1bT”)) {
88
89
if((pos < sum-1) && (buf[pos] == ‘E’))
90 break;
91 }
92 else if(!strncmp(msg, “FM”, 2)) {
93
94
if((pos+1 < sum-1) && (buf[pos+1] == ‘E’))
95 break;
96 }
97 else break;
98 }
99 return(sum);
100 }
Line 8 Sets the DR's IP address.
Line 9 Specifies the port number to connect.
Line 16 to 21 Command
Line 29 Starts Windows socket (Winsock Ver. 1.1).
Line 31 Creates a socket.
Line 33 to 36 Sets connection destination. inet_addr() and htons() are functions used to convert to
network format.
Line 38 Establishes connection.
Line 40 to 54 Sends a command and receives a response.
Line 55 Closes the socket.
Line 57 Terminates the use of the Windows socket.
Line 61 A function to receive ASCII data.
Line 69 Receives data from the destination. If the connection is down, recv() returns 0.
Line 78 to 79 Reads the response data by line.
Line 81 to 84 Determines the beginning of the last received line. The first character of the last line is
buff[pos].
Line 87 to 97 If the response data are final (all responses have been received with respect to each
command), return to main.
8.4 Ethernet Program