默認情況下,QTcpSocket是異步的,因此當您調(diào)用connectToHost并在相同的上下文中寫入時,將不會發(fā)送,因為套接字未連接.你應該改變你的“客戶端”代碼：

void TopLevelComms::connect(){

tcpSocket->connectToHost(hostAddress,QIODevice::ReadWrite);

if(tcpSocket->waitForConnected()) // putting 1 as parameter isn't reasonable,using default 3000ms value

{

QString string = "Hello";

QByteArray array;

array.append(string);

qDebug()<write(array);

}

else

{

qDebug() << "couldn't connect";

}

}

注意：您也沒有檢查是否能夠聽

void Comms::attemptConnection(){

connect(server,SLOT(connectionAccepted()));

//socket = server->nextPendingConnection();

if(server->listen(hostAddress,hostPort))

{

qDebug() << "Server listening";

}

else

{

qDebug() << "Couldn't listen to port" << server->serverPort() << ":" << server->errorString();

}

//receivedData = socket->readAll();

}

最后一件事.請注意,QTcpServer :: nextPendingConnection()返回QTcpSocket,因此,不要采用新的連接,您可以使用nextPendingConnection創(chuàng)建新的QTcpSocket作為父

void Comms::connectionAccepted(){

qDebug()<

// WRONG! it will use QTcpSocket::QTcpSocket(QObject * parent)

//socket = new QTcpSocket(server->nextPendingConnection());

// use simple asign

socket = server->nextPendingConnection();

// move reading to slot

connect(socket,SIGNAL(readyRead()),SLOT(readSocket()));

}

現(xiàn)在我們將把閱讀移到單獨的插槽

void Comms::readSocket()

{

// note that dynamic size array is incompatible with some compilers

// we will use Qt data structure for that

//char* rec = new char[socket->readBufferSize()];

qDebug()<readBufferSize();

// note that QByteArray can be casted to char * and const char *

QByteArray data = socket->readAll();

}

我必須承認,這樣的小代碼示例是很多錯誤.您需要了解有關TCP / IP連接的一些知識.那些是流,并且沒有一個保證,整個數(shù)據(jù)塊將一次給你

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