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前言
因为在写代码的时候感觉用VS太过臃肿，每次写个程序还要创建一个项目，并且特别占用空间，因此安装了mingw，可以在命令行中直接gcc编译，特别方便，安利一下～
并且在编译socket程序的时候，一定要加上-l wsock32选项，因为mingw默认没有包含windows库
TCP版本
- SERVER端
#include <Winsock2.h>
#pragma comment(lib, "ws2_32.lib")
#include <stdio.h>
int main(int argc, char* argv[]) {
WSADATA wsaData;
WORD sockVersion = MAKEWORD(2, 2);
if (WSAStartup(sockVersion, &wsaData) != 0) {
return 0;
}
SOCKET sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sListen == INVALID_SOCKET) {
printf("socket error\n");
return 0;
}
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(4500);
sin.sin_addr.S_un.S_addr = INADDR_ANY;
if (bind(sListen, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR) {
printf("socket error\n");
closesocket(sListen);
return 0;
}
if (listen(sListen, 5) == SOCKET_ERROR) {
printf("socket error\n");
closesocket(sListen);
return 0;
}
struct sockaddr_in remoteAddr;
SOCKET sClient;
int nAddrLen = sizeof(remoteAddr);
char revData[255];
while(TRUE){
sClient = accept(sListen, (SOCKADDR*)&remoteAddr, &nAddrLen);
if (sClient == SOCKET_ERROR) {
printf("accept() error\n");
continue;
}
printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
int ret = recv(sClient, revData, 255, 0);
if (ret > 0) {
revData[ret] = 0x00;
printf(revData);
}
char* buff = (char*)"\r\nHello, my friend\r\n";
send(sClient, buff, strlen(buff), 0);
closesocket(sClient);
}
closesocket(sListen);
WSACleanup();
return 0;
}
- CLIENT端
#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib")
int main(int argc, char* argv[]) {
WSADATA wsaData;
WORD sockVersion = MAKEWORD(2, 2);
if (WSAStartup(sockVersion, &wsaData) != 0) {
return 0;
}
SOCKET sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sClient == SOCKET_ERROR) {
printf("socket error\n");
return 0;
}
struct sockaddr_in servAddr;
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(4500);
servAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
if (connect(sClient, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR) {
printf("socket error\n");
closesocket(sClient);
return 0;
}
char* buff = (char*)"\r\nHello, my friend\r\n";
send(sClient, buff, strlen(buff), 0);
char revData[255];
int ret = recv(sClient, revData, 255, 0);
if (ret > 0) {
revData[ret] = 0x00;
printf(revData);
}
closesocket(sClient);
WSACleanup();
return 0;
}
- 编译
gcc server.c -o server -lwsock32
gcc client.c -o client -lwsock32
UDP版本
- SERVER端
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib")
#include <stdio.h>
int main(int argc, char* argv[])
{
WSADATA wsaData;
WORD sockVersion = MAKEWORD(2, 2);
if (WSAStartup(sockVersion, &wsaData) != 0)
{
return 0;
}
SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (serSocket == INVALID_SOCKET)
{
printf("socket error !");
return 0;
}
struct sockaddr_in serAddr;
serAddr.sin_family = AF_INET;
serAddr.sin_port = htons(8000);
serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
if (bind(serSocket, (SOCKADDR*)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
{
printf("bind error !");
closesocket(serSocket);
return 0;
}
struct sockaddr_in remoteAddr;
int nAddrLen = sizeof(remoteAddr);
while (TRUE)
{
char recvData[255];
int ret = recvfrom(serSocket, recvData, 255, 0, (SOCKADDR*)&remoteAddr, &nAddrLen);
if (ret > 0)
{
recvData[ret] = 0x00;
printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
printf(recvData);
}
char * sendData = "一个来自服务端的UDP数据包\n";
sendto(serSocket, sendData, strlen(sendData), 0, (SOCKADDR*)&remoteAddr, nAddrLen);
}
closesocket(serSocket);
WSACleanup();
return 0;
}
- CLIENT端
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
#include <stdio.h>
int main(int argc, char* argv[])
{
WORD socketVersion = MAKEWORD(2, 2);
WSADATA wsaData;
if (WSAStartup(socketVersion, &wsaData) != 0)
{
return 0;
}
SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(8000);
sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
int len = sizeof(sin);
char * sendData = "Hello, my friend\n";
sendto(sclient, sendData, strlen(sendData), 0, (SOCKADDR*)&sin, len);
char recvData[255];
int ret = recvfrom(sclient, recvData, 255, 0, (SOCKADDR*)&sin, &len);
if (ret > 0)
{
recvData[ret] = 0x00;
printf(recvData);
}
closesocket(sclient);
WSACleanup();
return 0;
}
- 编译
gcc server_udp.c -o server_udp -lwsock32
gcc client_udp.c -o client_udp -lwsock32
总结
对于TCP版本的程序来说
server 端：创建WSAStartup -》检测!=0 -》创建socket -》检测SOCKET_ERROR -》声明sockaddr_in结构 -》bind -》检测SOCKET_ERROR -》listen -》检测SOCKET_ERROR -》进入循环 -》accept -》检测SOCKET_ERROR -》接收、发送消息
client 端：创建WSAStartup -》检测!=0 -》创建socket -》检测SOCKET_ERROR -》声明sockaddr_in结构 -》connect -》检测SOCKET_ERROR -》发送、接收消息
对于UDP版本的程序来说
server 端：创建WSAStartup -》检测!=0 -》创建socket -》检测SOCKET_ERROR -》声明sockaddr_in结构 -》bind -》检测SOCKET_ERROR -》进入循环 -》发送、接收消息
client 端：创建WSAStartup -》检测!=0 -》创建socket -》检测SOCKET_ERROR -》声明sockaddr_in结构 -》发送、接收消息
TCP中，使用send和recv函数进行发送和接收消息
UDP中，使用sendto和recvfrom函数进行发送和接收消息
