UDP客户端源程序
#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "WS2_32.lib")
#define BUF_SIZE 1024
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 5678
int main(int argc, char** argv)
{
WSADATA wsaData;
SOCKET socketC;
SOCKADDR_IN serverAddr;
char sendbuf[BUF_SIZE] = "Hello UDP World!";
WSAStartup(MAKEWORD(1,1), &wsaData);
socketC = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(SERVER_PORT);
serverAddr.sin_addr.s_addr = inet_addr(SERVER_IP);
sendto(socketC, sendbuf, sizeof(sendbuf), 0, (SOCKADDR*)&serverAddr, sizeof(serverAddr));
closesocket(socketC);
WSACleanup();
return 0:
}
UDP服务器端源程序
#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "WS2_32.lib")
#define BUF_SIZE 1024
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 5678
int main(int argc, char** argv)
{
WSADATA wsaData;
SOCKET socketC;
SOCKADDR_IN serverAddr;
char recvbuf[BUF_SIZE];
WSAStartup(MAKEWORD(1,1), &wsaData);
socketC = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(SERVER_PORT);
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(socketC, (SOCKADDR*)&serverAddr, sizeof(serverAddr));
int nRet = recvfrom(socketC, recvbuf, sizeof(recvbuf), 0, 0, 0);
if (nRet > 0)
printf("%s ", recvbuf);
closesocket(socketC);
WSACleanup();
return 0:
}
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