windows API服务器端
//Server.cpp
#include <iostream>
#include <winsock2.h>
using namespace std;
#pragma comment(lib， "ws2_32.lib")
#define PORT 8889
#define IP_ADDRESS "127.0.0.1"
DWORD WINAPI ClientThread(LPVOID lpParameter)
{
SOCKET CientSocket = (SOCKET)lpParameter;
int Ret = 0;
char RecvBuffer[MAX_PATH];
while (true)
{
memset(RecvBuffer， 0x00， sizeof(RecvBuffer));
Ret = recv(CientSocket， RecvBuffer， MAX_PATH， 0);
if (Ret == 0 || Ret == SOCKET_ERROR)
{
cout << "客户端退出!" << endl;
break;
}
cout << "接收到客户信息为:" << RecvBuffer << endl;
}
return 0;
}
int main(int argc， char* argv[])
{
WSADATA  Ws;
SOCKET ServerSocket， ClientSocket;
struct sockaddr_in LocalAddr， ClientAddr;
int Ret = 0;
int AddrLen = 0;
HANDLE hThread = NULL;
//Init Windows Socket
if (WSAStartup(MAKEWORD(2， 2)， &Ws) != 0)
{
cout << "Init Windows Socket Failed::" << GetLastError() << endl;
return -1;
}
//Create Socket
ServerSocket = socket(AF_INET， SOCK_STREAM， IPPROTO_TCP);
if (ServerSocket == INVALID_SOCKET)
{
cout << "Create Socket Failed::" << GetLastError() << endl;
return -1;
}
LocalAddr.sin_family = AF_INET;
LocalAddr.sin_addr.s_addr = inet_addr(IP_ADDRESS);
LocalAddr.sin_port = htons(PORT);
memset(LocalAddr.sin_zero， 0x00， 8);
//Bind Socket
Ret = bind(ServerSocket， (struct sockaddr*)&LocalAddr， sizeof(LocalAddr));
if (Ret != 0)
{
cout << "Bind Socket Failed::" << GetLastError() << endl;
return -1;
}
//listen
Ret = listen(ServerSocket， 10);
if (Ret != 0)
{
cout << "listen Socket Failed::" << GetLastError() << endl;
return -1;
}
cout << "服务端已经启动" << endl;
while (true)
{
AddrLen = sizeof(ClientAddr);
ClientSocket = accept(ServerSocket， (struct sockaddr*)&ClientAddr， &AddrLen);
if (ClientSocket == INVALID_SOCKET)
{
cout << "Accept Failed::" << GetLastError() << endl;
break;
}
cout << "客户端连接::" << inet_ntoa(ClientAddr.sin_addr) << ":" << ClientAddr.sin_port << endl;
hThread = CreateThread(NULL， 0， ClientThread， (LPVOID)ClientSocket， 0， NULL);
if (hThread == NULL)
{
cout << "Create Thread Failed!" << endl;
break;
}
CloseHandle(hThread);
}
closesocket(ServerSocket);
closesocket(ClientSocket);
WSACleanup();
return 0;
}
　　windows API客户端
// Client.cpp
#include <iostream>
#include <winsock2.h>
using namespace std;
#pragma comment(lib， "ws2_32.lib")
#define PORT 8889
#define IP_ADDRESS "127.0.0.1"
int main(int argc， char * argv[])
{
WSADATA Ws;
SOCKET ClientSocket;
struct sockaddr_in ServerAddr;
int Ret = 0;
int AddrLen = 0;
HANDLE hThread = NULL;
char SendBuffer[MAX_PATH];
//Init Windows Socket
if (WSAStartup(MAKEWORD(2， 2)， &Ws) != 0)
{
cout << "Init Windows Socket Failed::" << GetLastError() << endl;
return -1;
}
//Create Socket
ClientSocket = socket(AF_INET， SOCK_STREAM， IPPROTO_TCP);
if (ClientSocket == INVALID_SOCKET)
{
cout << "Create Socket Failed::" << GetLastError() << endl;
return -1;
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_addr.s_addr = inet_addr(IP_ADDRESS);
ServerAddr.sin_port = htons(PORT);
memset(ServerAddr.sin_zero， 0x00， 8);
Ret = connect(ClientSocket， (struct sockaddr*)&ServerAddr， sizeof(ServerAddr));
if (Ret == SOCKET_ERROR)
{
cout << "Connect Error::" << GetLastError() << endl;
return -1;
}
else
{
cout << "连接成功!" << endl;
}
while (true)
{
cin.getline(SendBuffer， sizeof(SendBuffer));
Ret = send(ClientSocket， SendBuffer， (int)strlen(SendBuffer)， 0);
if (Ret == SOCKET_ERROR)
{
cout << "Send Info Error::" << GetLastError() << endl;
break;
}
}
closesocket(ClientSocket);
WSACleanup();
return 0;
}
　　网络字节序与主机字节序转换，有如下4个函数：
　　htons()，htonl()，ntohs()，ntohl()
　　h表示host字节序，n表示net字节序，s表示short，l表示long。
　　htons是将整型变量从主机字节顺序转变成网络字节顺序， 是整数在地址空间存储方式变为：高位字节存放在内存的低地址处。
　　网络字节顺序是TCP/IP中规定好的一种数据表示格式，它与具体的CPU类型、操作系统等无关，从而可以保证数据在不同主机之间传输时能够被正确解释，网络字节顺序采用big-endian排序方式。