《TCP IP网络编程》尹圣雨----8.第五章源码展示

第五章在迭代回响服务器上加了一个新功能，计算。

下面贴出代码

op_server_win.c

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <WinSock2.h>#define BUF_SZIE 1024#define OPSZ 4void ErrorHandling(char *message);int calculate(int opnum, int opnds[], char oprator);int main(int argc, char *argv[]) {WSADATA wsaData;SOCKET hServSock, hClntSock;char opinfo[BUF_SZIE];int result,opndCnt, i;int recvCnt, recvLen;SOCKADDR_IN servAdr, clntAdr;int clntAdrSize;if (argc != 2) {printf("Usage : %s <port>\n", argv[0]);exit(1);}if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)ErrorHandling("WSAStartup() error!");hServSock = socket(PF_INET, SOCK_STREAM, 0);if (hServSock == INVALID_SOCKET)ErrorHandling("socket() error!");memset(&servAdr, 0, sizeof(servAdr));servAdr.sin_family = AF_INET;servAdr.sin_addr.s_addr = htonl(INADDR_ANY);servAdr.sin_port = htons(atoi(argv[1]));if (bind(hServSock, (SOCKADDR *)&servAdr, sizeof(servAdr)) == SOCKET_ERROR)ErrorHandling("bind() error!");if (listen(hServSock, 5) == SOCKET_ERROR)ErrorHandling("listen() error!");clntAdrSize = sizeof(clntAdr);for (i = 0; i < 5; i++) {opndCnt = 0;hClntSock = accept(hServSock, (SOCKADDR*)&clntAdr, &clntAdrSize);recv(hClntSock, (char*)&opndCnt, 1, 0);recvLen = 0;while ((opndCnt*OPSZ + 1)>recvLen) {recvCnt = recv(hClntSock, &opinfo[recvLen], BUF_SZIE, 0);recvLen += recvCnt;}result = calculate(opndCnt, (int *)opinfo, opinfo[recvLen - 1]);send(hClntSock, (char*)&result, sizeof(result), 0);closesocket(hClntSock);}closesocket(hServSock);WSACleanup();return 0;}int calculate(int opnum, int opnds[], char op) {int result = opnds[0], i;switch (op) {case '+':for (i = 1; i < opnum; i++) result += opnds[i];break;case '-':for (i = 1; i < opnum; i++) result -= opnds[i];break;case '*':for (i = 1; i < opnum; i++) result *= opnds[i];break;}return result;}void ErrorHandling(char *message) {fputs(message, stderr);fputs("\n", stderr);exit(1);}

op_client_win.c

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <WinSock2.h>#define BUF_SIZE 1024#define RLT_SIZE 4#define OPSZ 4void ErrorHandling(char* message);int main(int argc, char *argv[]) {WSADATA wsaData;SOCKET hSocket;char opmsg[BUF_SIZE];int result, opndCnt, i;SOCKADDR_IN servAdr;if (argc != 3) {printf("Usage: %s <IP> <port>\n", argv[0]);exit(1);}if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)ErrorHandling("WSAStartup() error!");hSocket = socket(PF_INET, SOCK_STREAM, 0);if (hSocket == INVALID_SOCKET)ErrorHandling("socket() error!");memset(&servAdr, 0, sizeof(servAdr));servAdr.sin_family = AF_INET;servAdr.sin_addr.s_addr = inet_addr(argv[1]);servAdr.sin_port = htons(atoi(argv[2]));if (connect(hSocket, (SOCKADDR*)&servAdr, sizeof(servAdr)) == SOCKET_ERROR)ErrorHandling("connect() error!");elseputs("connected......");fputs("Operand count:", stdout);scanf_s("%d", &opndCnt);opmsg[0] = (char)opndCnt;for (i = 0; i < opndCnt; i++) {printf("Operand %d:", i + 1);scanf_s("%d", (int*)&opmsg[i*OPSZ + 1]);}fgetc(stdin);fputs("Operator:", stdout);scanf_s("%c", &opmsg[opndCnt*OPSZ + 1]);send(hSocket, opmsg, opndCnt*OPSZ + 2, 0);recv(hSocket,(char*) &result, RLT_SIZE, 0);printf("Operation result: %d\n", result);closesocket(hSocket);WSACleanup();return 0;}void ErrorHandling(char * message) {fputs(message, stderr);fputc('\n', stderr);exit(1);}

难点在于传送数据时对数据类型的转换。

推荐《征服C指针》这本书，看完基本上对指针这一块儿能理解得更准确。