#include <WinSock2.h> #include <stdio.h> #pragma comment(lib, "ws2_32.lib") int main() { // initial socket library WORD wVerisonRequested; WSADATA wsaData; int err; wVerisonRequested = MAKEWORD(1, 1); err = WSAStartup(wVerisonRequested, &wsaData); if (err != 0) { return -1; } //if (LOBYTE(wsaData.wVersion) != 1 || //HIBYTE(wsaData.wHighVersion) != 1) //{ //WSACleanup(); //return -1; //} // create socket SOCKET sockServer = socket(AF_INET, SOCK_DGRAM, 0); // bind socket SOCKADDR_IN addrServer; addrServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY); addrServer.sin_family = AF_INET; addrServer.sin_port = htons(6000); bind(sockServer, (SOCKADDR *)&addrServer, sizeof(addrServer)); // receive SOCKADDR_IN addrClient; int len = sizeof(addrClient); char recvBuf[100]; recvfrom(sockServer, recvBuf, 100, 0, (SOCKADDR *)&addrClient, &len); printf("%s", recvBuf); // close socket closesocket(sockServer); WSACleanup(); }

#include <WinSock2.h> #include <stdio.h> #pragma comment(lib, "ws2_32.lib") int main() { // initial socket library WORD wVerisonRequested; WSADATA wsaData; int err; wVerisonRequested = MAKEWORD(1, 1); err = WSAStartup(wVerisonRequested, &wsaData); if (err != 0) { return -1; } //if (LOBYTE(wsaData.wVersion) != 1 || //HIBYTE(wsaData.wHighVersion) != 1) //{ //WSACleanup(); //return -1; //} // create socket SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, 0); SOCKADDR_IN addrServer; addrServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); addrServer.sin_family = AF_INET; addrServer.sin_port = htons(6000); // send char sendBuf[100] = "this is lisi\n"; sendto(sockClient, sendBuf, strlen(sendBuf)+1,0, (SOCKADDR*)&addrServer, sizeof(SOCKADDR)); // close connection socket closesocket(sockClient); // clean socket library WSACleanup(); }