9.2 A Simple Synchronous Server
The primary job of a server is to accept client connections. This can be done through the use of the Berkeley Socket Adapter. Example 16 shows a simple daytime server:
Example 16: Daytime Server
#include <rw/tools/datetime.h>
#include <rw/cstring.h>
#include <rw/network/RWSocket.h>
#include <rw/network/RWInetAddr.h>
#include <rw/network/RWWinSockInfo.h>
int main(void)
{
RWWinSockInfo winsock; // 1
RWInetAddr addr(1025); // 2
RWSocket sock;
sock.listen(addr); // 3
do {
RWSocket conn = sock.accept(); // 4
RWDateTime now = RWDateTime::now(); // 5
RWCString response = now.asString(); // 6
conn.sendAtLeast(response); // 7
conn.close(); // 8
} while(1);
sock.close();
return 0;
}
| //1 | Initializes the winsock library if appropriate (Windows platform only) |
| //2 | Creates an address object, which represents the IP address and port number that this server will be waiting for client connections on. |
| //3 | Binds the server side socket to the address constructed in the first step. |
| //4 | Waits for an incoming connection, assigning that connection to conn for later use. |
| //5 | Constructs a time object, which represents the current date and time. |
| //6 | Formats the time object as a string so we can easily send it to the client. |
| //7 | Send the response. |
| //8 | Close the connection to the client and wait for further client connections. |
Example 16 could be further extended to provide some exception handling. Placing a simple try/catch inside the loop allows for communication errors to be easily handled, as illustrated below:
do {
RWSocket conn = sock.accept();
RWDateTime now = RWDateTime::now();
RWCString response = now.asString();
try {
conn.sendAtLeast(response);
} catch(const RWxmsg& m) {
cout << "Exception: " << m.why() << endl;
}
conn.close();
} while(1);
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