This function might be called with a maxSize of 0, which can be used to perform post-reading operations. See alsoread(),readLine(), andwriteData(). qint64QIODevice::readLine(char*data,qint64maxSize) This function reads a line of ASCII characters from the device, up to a maximum ofmax...
bool startsWith ( const QString & s, Qt::CaseSensitivity cs = Qt::CaseSensitive ) const bool startsWith ( const QLatin1String & s, Qt::CaseSensitivity cs = Qt::CaseSensitive ) const bool startsWith ( const QChar & c, Qt::CaseSensitivity cs = Qt::CaseSensitive ) const QByteArray ...
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An empty string is any string with size 0. A null string is always empty, but an empty string isn't necessarily null: QString().isNull(); // returns true QString().isEmpty(); // returns true QString("").isNull(); // returns false QString("").isEmpty(); // returns true ...
would have been reset setTime(time); } } else if (dateShown && !timeShown) { setTimeRange(QDATETIMEEDIT_TIME_MIN, QDATETIMEEDIT_TIME_MAX); d->value = QDateTime(d->value.toDate(), QTime(), d->spec); } d->updateEdit(); d->_q_editorCursorPositionChanged(-1, 0); } } /...
Returns the number of bytes that are waiting to be written. The bytes are written when control goes back to the event loop or whenflush() is called. See alsobytesAvailable() andflush(). boolQAbstractSocket::canReadLine() const[virtual] ...
QLayout::SetMaximumSize4The main widget's maximum size is set tomaximumSize(); it cannot be larger. QLayout::SetMinAndMaxSize5The main widget's minimum size is set tominimumSize() and its maximum size is set tomaximumSize().
void QWebEngineProfile::setHttpCacheMaximumSize(int maxSize) Sets the maximum size of the HTTP cache to maxSize bytes. Setting it to 0 means the size will be controlled automatically by QtWebEngine. See also httpCacheMaximumSize() and setHttpCacheType(). void QWebEngineProfile::setHttpCache...
QByteArray readLine(qint64 maxSize = 0) // Signals void readyRead() // 利用信号异步处理 connect(&port, SIGNAL(readyRead()), this, SLOT(receiveInfo())); void receiveInfo(){ QByteArray data = port.readAll(); } 错误判断 signal: void errorOccurred(QSerialPort::SerialPortError error); func...
(data, maxSize); 8 9 // Handle remote close 10 if (readBytes == 0 && d->socketType == QAbstractSocket::TcpSocket) { 11 d->setError(QAbstractSocket::RemoteHostClosedError, 12 QNativeSocketEnginePrivate::RemoteHostClosedErrorString); 13 close(); 14 return -1; 15 } 16 return read...