qt客戶端怎麼接收伺服器端
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⑵ qt socket編程問題，不能接收數據，懂的幫忙解答一下，謝謝了。
接收函數內，一開始就readAll()，已經把數據都讀取了，所以後面就沒有可讀數據了，所以後面不用判斷bytesAvaliables()。
接收的時候，不要直接接收到QString中。應該先讀取一個長度值（quint16），再根據長度值去讀取QByteArray，再把讀取到的QByteArray放到QString中。然後再判斷bytesAvaliables是否還有剩餘。有剩餘，就再接收長度值+QByteArray。。。。
⑶ Qt Socket網路編程 伺服器端提示QIODevice::read (QTcpSocket): device not open，但是與客戶端連接成功
這是因為文件路徑不對造成的，解決方法如下：
1、首先pro文件配置：Qt網路功能需要在pro文件增加網路庫。
⑷ QT tcp 瀹㈡埛絝鏀朵笉鍒版暟鎹 QTcpSocket 璁板綍
浣跨敤鏂規硶1 緇ф壙QT thread 閲嶅啓run
void DataUnpacket::run( )
{
m_pSocket = new QTcpSocket;
//m_pSocket->socketOption(QAbstractSocket::LowDelayOption);
QString ip("192.168.112.100");
ushort portData = 5001;
m_pSocket->connectToHost( ip, portData );
m_pSocket->waitForConnected();
if( QAbstractSocket::ConnectedState != m_pSocket->state() )//鍒ゆ柇鏄鍚﹁繛鎺ユ垚鍔
return;
while( m_bRunning )
{
if( m_pSocket->bytesAvailable() > 0)
{
QByteArray arr = m_pSocket->readAll(); //榪欎笉榪涳紝
qDebug() << "recv len =" << arr.length() ;
}
else
{
m_pSocket->write("test",4);
m_pSocket->flush();// 鍙浠ュ彂閫佸嚭鍘
QThread::usleep(1000);
}
}
}
鏂規硶浜 movethred 鏁堟灉 涓鏍
鏂規硶涓 SocketQThread涓浣跨敤 QtConcurrent::run鍒涘緩綰跨▼錛 榪欎釜浣跨敤QTCreater 璋冭瘯娌℃湁闂棰橈紝榪欎釜涔熸槸澶у潙
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int SocketQThread::InitTest( )
{
int re = 0;
QString ip("192.168.112.5");
ushort portData = 5001;
m_pDataPackage.resize(1);
m_pDataPackage[0] = new DataUnpacket;
if( !m_pDataPackage[0]->InitSocket(ip,portData ) )
re = -1;
return re;
}
void SocketQThread::stratThred()
{
m_running = true;
for(int i=0;i<1;i++)//嫻嬭瘯
{
QtConcurrent::run(this, &SocketQThread::recvDataThread, i );
}
}
void SocketQThread::stopThred()
{
m_running = false;
for(int i=0;i<1;i++)//嫻嬭瘯
{
m_pDataPackage[0]->CloseFile( );
m_pDataPackage[0]->tcpDisconnect( );
}
}
void SocketQThread::recvDataThread( int ch )//鏆傚畾
{
DataUnpacket* pPackage = m_pDataPackage[ch];
while( m_running )
{
if( pPackage->SocketBytesAvailable() > 0)
pPackage->RecvData();
else
QThread::usleep(1);
}
}
綾籇ataUnpacket 緇ф壙 Cpackage 濡備笅:
m_Socket涓篊package鐨勬垚鍛樺彉閲
int DataUnpacket::RecvData( )
{
int re = 0;
QByteArray reArr;
QByteArray arr = m_Socket.readAll();
qDebug() << "recv len =" << arr.length() ;
#if 0
m_Socket.write(arr );
m_Socket.flush();//涓嶅姞鍙戜笉鍑哄幓
#else
QMetaObject::invokeMethod( &m_Socket, std::bind( static_cast< qint64(QTcpSocket::*)(const QByteArray &) >( &QTcpSocket::write ),&m_Socket, arr ));//, Qt::DirectConnection
//鑻ュ姞 Qt::DirectConnection 錛岄渶瑕佹坊鍔爉_Socket.flush();/
return re;
}
bool Cpackage::InitSocket(QString& ip, ushort& port )
{
bool tf = true;
m_Socket.connectToHost( ip, port );
m_Socket.waitForConnected();
if( QAbstractSocket::ConnectedState != m_Socket.state() )//鍒ゆ柇鏄鍚﹁繛鎺ユ垚鍔
tf = false;
return tf;
}
void Cpackage::tcpDisconnect( )
{
if( m_Socket.state() == QAbstractSocket::ConnectedState) //鍏抽棴鏃訛紝紜淇濅笌鏈嶅姟鍣ㄦ柇寮榪炴帴
m_Socket.disconnectFromHost();
}
鏂規硶鍥 QtConcurrent::run(this, &DataUnpacket::RecvDataTest); 榪欎釜
void testData::RecvDataTest()
{
m_pSocket = new QTcpSocket(this);
//m_pSocket->socketOption(QAbstractSocket::LowDelayOption);
QString ip("192.168.112.100");
ushort portData = 5001;
m_pSocket->connectToHost( ip, portData );
m_pSocket->waitForConnected();
if( QAbstractSocket::ConnectedState != m_pSocket->state() )//鍒ゆ柇鏄鍚﹁繛鎺ユ垚鍔
return;
while( m_bRunning )
{
if( m_pSocket->bytesAvailable() > 0)
{
QByteArray arr = m_pSocket->readAll();//榪欎笉榪涳紝
qDebug() << "recv len =" << arr.length() ;
}
else
{
m_pSocket->write("test",4);
m_pSocket->flush();//鍙浠ュ彂閫佸嚭鍘
QThread::usleep(1000);
}
}
}
濡備笅渚嬪瓙 鏄鍙浠ョ殑
void testData::RecvDataTest()
{
qDebug() << QThread::currentThread();
QByteArray arr = m_pSocket->readAll();//榪欎笉榪涳紝
qDebug() << "recv len =" << arr.length() ;
m_pSocket->write("test",4);
}
void testData::stratThred( bool tf )
{
if( tf )
start();
else
exit();
}
void testData::run( )
{
qDebug() << "stratThred" << QThread::currentThread();
if( nullptr == m_pSocket )
{
m_pSocket = new QTcpSocket;
connect(m_pSocket, SIGNAL(readyRead()), this, SLOT(RecvDataTest()), Qt::DirectConnection);
//m_pSocket->socketOption(QAbstractSocket::LowDelayOption);
}
m_pSocket->connectToHost( QString("192.168.112.100"), 5001 );
m_pSocket->waitForConnected();
if( QAbstractSocket::ConnectedState != m_pSocket->state() )//鍒ゆ柇鏄鍚﹁繛鎺ユ垚鍔
return;
//m_pSocket->waitForReadyRead(1000);
exec();
m_pSocket->disconnectFromHost();
}
⑸ qt怎麼把windows自帶的ftp
配置好伺服器之後，便可以使用QT或者其他工具實現文件上傳和下載了。
關鍵代碼如下：
void ftp_upload::upload() { ftp = new QFtp(this); ftp->connectToHost("192.168.0.50",21); //連接到伺服器,填寫你的ip地址，這里默認埠號為21 ftp->login("test","testpasswd"); //登錄,填寫響應的用戶名和密碼 //windows自帶的ftp伺服器，客戶端上傳文件到伺服器 QFile *uploadFile = new QFile("D:/2014.txt");//要上傳到伺服器的的文件位置：D盤下的2014.txt文檔，該文檔存在於客戶端 QString des = "2014_uploadToServer.txt";//ftp伺服器「收到」客戶端上傳的文檔位置：物理路徑根目錄下的文檔2014_upload.txt uploadFile->open(QIODevice::ReadWrite); ftp->put(uploadFile,des); //windows自帶的ftp伺服器，從伺服器下載文件到客戶端 QFile *download = new QFile("D:/downloadFromServer.txt"); download->open(QIODevice::ReadWrite); ftp->get("download.txt",download);//把伺服器物理路徑根目錄下的download.txt下載到本地D盤根目錄 }