Question

Windows系统用C语言写TCP通信

是不是必须用send函数发送消息？send函数只能传输字符串，那如果要传输其他类型，是不是要手动转化成字符串类型？？

Answer 1

#include
#include
#include
#pragma comment(lib,"ws2_32.lib")
typedef struct{
SOCKET accpt;
int lock;
}Arg;
void *transfer(void *arg)
{
Arg * info = (Arg *)arg;
SOCKET clientSock;
char recvbuf[102];
char sendBuf[] = "10";
int ret;
memcpy(&clientSock,(void*)&info->accpt,sizeof(clientSock));
info->lock =1;
while (TRUE)
{
ret = send(clientSock,sendBuf,2,0);
if (ret == -1)
{
break;
}
ret = recv(clientSock,recvbuf,102,0);
printf("%s\n",recvbuf);
}
return (void *)0;
}
void* timer(void *arg)
{
time_t last = time(NULL);
time_t now;
int i = 20;
while(i--)
{
now = time(NULL);
if(now - last == 1)
{
printf("1s past!\n");
last = now;
}
Sleep(500);
}
printf("timer exit.\n");
return (void *)0;
}
int main(void) {
WSADATA wsaData;
SOCKET ListenSocket;
SOCKADDR_IN service,client;
int len = sizeof(client);
Arg argument;
pthread_t tid;
char sendBuf[] = "ID=2;WHAT=host";
int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != NO_ERROR) {
printf("Error at WSAStartup()\n");
return 1;
}
ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (ListenSocket == INVALID_SOCKET) {
printf("Error at socket(): %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
service.sin_family = AF_INET;
service.sin_addr.s_addr = inet_addr("127.0.0.1");
service.sin_port = htons(27115);
if (bind( ListenSocket,
(SOCKADDR*) &service,
sizeof(service)) == SOCKET_ERROR) {
printf("bind() failed.\n");
closesocket(ListenSocket);
WSACleanup();
return 1;
}
if (listen( ListenSocket, 1 ) == SOCKET_ERROR) {
printf("Error listening on socket.\n");
closesocket(ListenSocket);
WSACleanup();
return 1;
}
argument.lock = 1;
printf("Waiting for client to connect...\n");
pthread_create(&tid,NULL,timer,NULL);
while(TRUE){
argument.accpt = accept( ListenSocket, (SOCKADDR*)&client, &len );
if (argument.accpt == INVALID_SOCKET) {
printf("accept failed: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
} else {
printf("accept%s:%d\n",inet_ntoa(client.sin_addr),client.sin_port);
while (!argument.lock);
argument.lock = 0;
// sendto(argument.accpt,sendBuf,sizeof(sendBuf),0,(SOCKADDR*)&client,len);
pthread_create(&tid,NULL,transfer,&argument);
//send(AcceptSocket,sendBuf,sizeof(sendBuf),0);
}
}
// No longer need server socket
closesocket(ListenSocket);
WSACleanup();
return 0;
}