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#include <QCoreApplication>#include <QtNetwork>#include <QTcpSocket>#include <QHostAddress>int main(int argc, char *argv[]){    QCoreApplication app(argc, argv);    QTcpSocket socket;    socket.connectToHost(QHostAddress("192.168.0.15"), 3000);    if(!socket.waitForConnected())        qDebug("Connection failed!\n");    else        qDebug("Connected!\n");    printf("write 1\n");    socket.write("localCDControl", 14);    socket.waitForBytesWritten(-1);    printf("write 2\n");    socket.write("/STOPCD\t1", 9);    socket.waitForBytesWritten(-1);    printf("write 3\n");    socket.write("/QUIT\t1", 7);    socket.waitForBytesWritten(-1);    printf("close\n");    socket.close();    printf("closed\n");    //app.exec();}