基于windows实现UDP通信
windows下的套接字编程：
>导入头文件winsock2.h
>链接ws2_32.lib库
client端：
/*uecho_client_win.c*/
#include
#include
#include
#include
#define BUF_SIZE 30
void ErrorHandling(char *message);
int main(int argc, char *argv[])
{
WSADATA wsa_data;
SOCKET sock;
char message[BUF_SIZE];
int str_len;
int clnt_addr_size;
SOCKADDR_IN serv_addr;
if(argc != 3)
{
printf("Usage: %s \n", argv[0]);
exit(1);
}
if(WSAStartup(MAKEWORD(2, 2), &wsa_data) != 0)
{
ErrorHandling("WSAStartup() error!");
}
sock = socket(AF_INET, SOCK_DGRAM, 0);
if(sock == INVALID_SOCKET)
{
ErrorHandling("UDP socket create error");
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
serv_addr.sin_port = htons(atoi(argv[2]));
connect(sock, (SOCKADDR*)&serv_addr, sizeof(serv_addr));
while(1)
{
fputs("insert message(q to quit):",stdout);
fgets(message, sizeof(message), stdin);
if(!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
{
break;
}
send(sock, message, strlen(message), 0);
str_len = recv(sock, message, sizeof(message) - 1, 0);
message[str_len] = 0;
printf("Message from server:%s",message);
}
closesocket(sock);
WSACleanup();
return 0;
}
void ErrorHandling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
} server端：
/*uecho_server_win.c*/
#include
#include
#include
#include
#define BUF_SIZE 30
void ErrorHandling(char *message);
int main(int argc, char *argv[])
{
WSADATA wsa_data;
SOCKET serv_sock;
char message[BUF_SIZE];
int strlen;
int clnt_addr_size;
SOCKADDR_IN serv_addr, clnt_addr;
if(argc != 2)
{
printf("Usage: %s \n", argv[0]);
exit(1);
}
if(WSAStartup(MAKEWORD(2, 2), &wsa_data) != 0)
{
ErrorHandling("WSAStartup() error!");
}
serv_sock = socket(AF_INET, SOCK_DGRAM, 0);
if(serv_sock == INVALID_SOCKET)
{
ErrorHandling("UDP socket create error");
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(atoi(argv[1]));
if(bind(serv_sock, (SOCKADDR*)&serv_addr, sizeof(serv_addr)) == SOCKET_ERROR)
{
ErrorHandling("bind() error");
}
while(1)
{
clnt_addr_size = sizeof(clnt_addr);
strlen = recvfrom(serv_sock, message, BUF_SIZE, 0,
(SOCKADDR*)&clnt_addr, &clnt_addr_size);
printf("message from client:%s\n",message);
sendto(serv_sock, message, strlen, 0,(SOCKADDR*)&clnt_addr, sizeof(clnt_addr));
}
closesocket(serv_sock);
WSACleanup();
return 0;
}
void ErrorHandling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
} 由于需要给主函数传入参数，无法在ide中运行，因此在dos下编译运行：
windows下的GCC编译器可安装mingw，安装过程可参考https://blog.csdn.net/qq_38080117/article/details/78022390
编译时需要链接ws2_32库
如下为client端的运行结果：
E:\codeblock_code\windows_udp>gcc uecho_client_win.c -o client -lws2_32
E:\codeblock_code\windows_udp>dir
驱动器 E 中的卷是 DATA
卷的序列号是 E84C-F75C
E:\codeblock_code\windows_udp 的目录
2019/07/09 17:26 .
2019/07/09 17:26 ..
2019/07/09 17:26 32,664 client.exe
2019/07/09 17:26 31,741 server.exe
2019/07/09 17:23 1,530 uecho_client_win.c
2019/07/09 17:25 1,543 uecho_server_win.c
4 个文件 67,478 字节
2 个目录 323,571,404,800 可用字节
E:\codeblock_code\windows_udp>client.exe 127.0.0.1 5000
insert message(q to quit):hello
Message from server:hello
insert message(q to quit):server
Message from server:server
insert message(q to quit):i am client
Message from server:i am client
insert message(q to quit):q 下面是与client对应的server的运行结果：
E:\codeblock_code\windows_udp>gcc uecho_server_win.c -o server -lws2_32
E:\codeblock_code\windows_udp>dir
驱动器 E 中的卷是 DATA
卷的序列号是 E84C-F75C
E:\codeblock_code\windows_udp 的目录
2019/07/09 17:26 .
2019/07/09 17:26 ..
2019/07/09 17:24 32,664 client.exe
2019/07/09 17:26 31,741 server.exe
2019/07/09 17:23 1,530 uecho_client_win.c
2019/07/09 17:25 1,543 uecho_server_win.c
4 个文件 67,478 字节
2 个目录 323,571,404,800 可用字节
E:\codeblock_code\windows_udp>server.exe 5000
message from client:hello
message from client:server
message from client:i am client