QT中使用winsock创建Tcp连接传文件

#第一步链接库

qmake：LIBS += -lws2_32
cmake：target_link_libraries( send（send是项目名称替换自己的） PUBLIC $<$<BOOL:${MINGW}>:ws2_32>)（实测有效）（注意是MINGW平台）

在还有就是在文件开头加入

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

也行

#加入头文件
 include <WinSock2.h>

#编写代码
调用WSAStartup，初始化套接字
发送

//定义变量
SOCKET msocket;
sockaddr_in server_addr;
    

WORD sockVerson = MAKEWORD(2, 2);
WSADATA wsaData;
if (WSAStartup(sockVerson, &wsaData))
{
    qDebug() << "初始化WinSock失败";
}

msocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (msocket == INVALID_SOCKET)
{
        qDebug() << "套接字创建失败";
        WSACleanup();
}
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(server_port.toUShort()); // 服务器侦听的端口号
server_addr.sin_addr.S_un.S_addr = inet_addr(server_ip.toStdString().c_str()); // 服务器IP地址

int result = ::connect(msocket, (struct sockaddr *)&server_addr, sizeof(server_addr));
if (result == SOCKET_ERROR) {
    qDebug() << "connect请求连接失败" << WSAGetLastError();
    closesocket(msocket);
    WSACleanup();
    }
else{
     qDebug() << "向服务器请求连接成功";
    }

//然后开始send
::send(msocket,filehead.data(),filehead.size(),0);

接收

    //定义变量
    SOCKET msocket;
    sockaddr_in serverAddr;
    sockaddr_in clientAddr;
    sockaddr_in remoteAddr;



    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) !=0 )
    {
        qDebug() << "Failed to initiate Winsock.";
    }
    msocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (msocket == INVALID_SOCKET)
    {
        qDebug() << "Failed to create socket.";
    }

    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(port.toUShort()); // 服务器侦听的端口号
    serverAddr.sin_addr.S_un.S_addr = inet_addr(ip.toStdString().c_str()); // 服务器IP地址

    if (bind(msocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR)  //(SOCKADDR*)
    {
        qDebug() << "socket绑定失败";
        closesocket(msocket);
    }
    //3.监听套接字
    listen(msocket, 5);
    //4.等待客户端的连接
    int clientAddrsize = sizeof(clientAddr);
    qDebug() <<  "等待客户端登录";
    int revSocket = accept(msocket, (SOCKADDR*)&clientAddr, &clientAddrsize);//等待客户端接入，直到有客户端连接上来为止
    if (revSocket == INVALID_SOCKET)
    {
        qDebug() << "服务器循环接收请求失败：\n" << WSAGetLastError();
        closesocket(msocket);
        WSACleanup();
    }
    else
    {
        qDebug() << "客服端与服务器建立连接成功：%s \n";
    }

    //int nRecvBuf=1024*8*10000;
    //int nTimeout = 1000;
    //setsockopt(msocket,SOL_SOCKET,SO_RCVBUF,(const char*)&nRecvBuf,sizeof(int));
    //setsockopt(msocket,SOL_SOCKET,SO_RCVTIMEO,(const char *)&nTimeout, sizeof(int));
    //5.收
    while(!stop1)
    {
        arry.resize(8192);
        int i = recv(revSocket, arry.data(), 8192, 0);
    }

注意读取的时候，一定是recv，accept返回的句柄，在这个句柄里才能读到发送的数据，尼玛读半天读不到数据，一直是-1。