TCP socket发送整形数据（数组，结构体）

使用TCP发送整型等（非字符型）数据时，经常会遇到不能将发送类型转换成const char*的错误。这其实是socket设定的问题，socket设定为只能传送字符型数据。

从read和write的函数生命可以看出，其实发送buffer应该是一个char型指针，所以我们只需要将要发送的数组或者是结构体强制转换成char*就可以了。

Client：

    struct ou_buffer w_buffer;

    w_buffer.a[0] = 1;

    w_buffer.a[1] = 3;

    w_buffer.b[0] = 2;

    w_buffer.b[1] = 4;

    w_buffer.b[2] = 6;

    w_buffer.b[3] = 8;

    QTcpSocket *tcpSocket = new QTcpSocket;

    tcpSocket->abort();

    tcpSocket->connectToHost("192.168.1.102",9734);//Server IP and port.

    qint32 ss[9] = {8,1,2,3,4,5};

    qDebug("CONNECT PROCEDURE...");

    if (tcpSocket->waitForConnected(4000))

        qDebug("Connected!");

    qDebug("\n");

    qDebug("WRITE PROCEDURE...");

    //int w = (tcpSocket->write)((char*)&w_buffer, sizeof(w_buffer));//pass

    int w = (tcpSocket->write)((char*)ss, sizeof(ss));//pass

    while(!tcpSocket->waitForBytesWritten(3000)){

        qDebug("sending...");

    }

Server：

while(1){

uint8_t in_buffer[56];
struct in_stu in_buffer2;

printf("server_waiting!\n");

client_sockfd = accept(server_sockfd, (struct sockaddr*)&client_address, &client_len);

int r, w;

printf("reading...\n");
  r = read(client_sockfd, in_buffer, sizeof(in_buffer));
printf("r = %d\n", r);

memcpy(&in_buffer2, in_buffer, sizeof(in_buffer));
printf("in_buffer.a[0] = %d\n", in_buffer2.a[0]);
printf("in_buffer.a[1] = %d\n", in_buffer2.a[1]);
printf("in_buffer.b[0] = %d\n", in_buffer2.b[0]);
printf("in_buffer.b[1] = %d\n", in_buffer2.b[1]);
printf("in_buffer.b[2] = %d\n", in_buffer2.b[2]);
printf("in_buffer.b[3] = %d\n", in_buffer2.b[3]);

...

}