简单UDP传输代码

//UDPcilentCEHO 文件传输客户端

#pragma comment(lib,"ws2_32.lib")

#include

#include

#include

#define MAX_BUF 65536

#define K_BUF 256

int main()

{

//初始化

WSAData wsaData;

int err=WSAStartup(WINSOCK_VERSION,&wsaData);

if(0!=err)

{

return -1;

}

SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);

if(sock == INV ALID_SOCKET)

{

printf("socket() Failed: %d\n", WSAGetLastError());

WSACleanup();

return -1;

}

//char destIP[] = "10.3.120.137";

char destIP[] = "172.17.195.174";

unsigned short destPort = 20000;

sockaddr_in destAddr;

destAddr.sin_family = AF_INET;

destAddr.sin_port = htons(destPort);

destAddr.sin_addr.s_addr = inet_addr(destIP);

printf("UDPclientCEHO had startup ! \n");

char data[]="Hello world ! ";

int sByte;

sByte = sendto(sock,data, strlen(data), 0, (sockaddr *)&destAddr, sizeof(destAddr));

if(sByte == SOCKET_ERROR)

{

printf("sendto() Failed: %d\n", WSAGetLastError());

closesocket(sock);

WSACleanup();

getchar();

return -1;

}

printf("client sendto server [%d]data : %s\n",sByte,data);

char readBuf[MAX_BUF];

int rByte;

sockaddr_in remoteAddr;

int remoteLen = sizeof(remoteAddr);

memset(readBuf, 0, MAX_BUF);

rByte = recvfrom(sock, readBuf, MAX_BUF, 0, (sockaddr *)&remoteAddr, &remoteLen);

if(rByte == SOCKET_ERROR)

{

printf("recv() Failed: %d\n", WSAGetLastError());

closesocket(sock);

WSACleanup();

return -1;

}

printf("client recv server [%d]data : %s\n",rByte,readBuf);

closesocket(sock);

WSACleanup();

return 0;

}

//UDPserverFileUDP文件传输服务器端

// Socket_echo_Server.cpp : 定义控制台应用程序的入口点。

//#include

#pragma comment(lib,"ws2_32.lib")

#include

#include

#include

#define MAX_BUF 65536

int main()

{

WSAData wsaData;

int err = WSAStartup(WINSOCK_VERSION, &wsaData);

if(0 != err)

{

return -1;

}

SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);

if(sock == INVALID_SOCKET)

{

printf("socket() Failed: %d\n", WSAGetLastError());

WSACleanup();return -1;

}

unsigned short destPort = 20000;

sockaddr_in localAddr;

localAddr.sin_family = AF_INET;

localAddr.sin_port = htons(destPort);

localAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

err = bind(sock, (sockaddr *)&localAddr, sizeof(localAddr));

if(err == SOCKET_ERROR)

{

printf("bind() FAILED: %d\n", WSAGetLastError());

closesocket(sock);WSACleanup();

return -1;

}

printf("Waiting for client ...\n");

char readBuf[MAX_BUF];

memset(readBuf, 0, MAX_BUF);

sockaddr_in remoteAddr;

int sByte;

int rByte;

int remoteLen;

remoteLen = sizeof(remoteAddr);

rByte = recvfrom(sock, readBuf, MAX_BUF, 0, (sockaddr *)&remoteAddr, &remoteLen); if(rByte == SOCKET_ERROR)

{

printf("recv() Failed: %d\n", WSAGetLastError());

closesocket(sock);

WSACleanup();

return -1;

}

printf("server recv client [%d]data

from %s : %s\n",rByte,inet_ntoa(remoteAddr.sin_addr),readBuf);

sByte = sendto(sock,readBuf, strlen(readBuf), 0, (sockaddr *)&remoteAddr, sizeof(remoteAddr));

if(sByte == SOCKET_ERROR)

{

printf("sendto() Failed: %d\n", WSAGetLastError());

closesocket(sock);

WSACleanup();

getchar();

return -1;

}

printf("server sendto client [%d]data : %s\n",sByte,readBuf);

closesocket(sock);

WSACleanup();

return 0;

}