Qt开发,一行代码报错: reference to non-static member function must be called; did you mean to call it with no arguments? 代码: if(tbxD.toPlainText().trimmed().length==0) { ... } if(tbxM.toPlainText().trimmed().length==0) { ... } if(tbxS.toPlainText().trimmed().length==0)...
Whenever I attempt to build it I get these messages /home/kiwifruit555/Documents/kUwU/Web/mainwindow.cpp:12: error: invalid use of non-staticmember function ‘voidQWebEnginePage::featurePermissionRequested(constQUrl&, QWebEnginePage::Feature)’ ../Web/mainwindow.cpp: In constructor ‘MainWind...
如题,在Qt类中需要用到信号和槽时,需要在类里面加上Q_OBJECT,但是加上之后再编译会报错undefined reference to staticMetaObject,重新编译也不管用,此时选择“执行qmake”,执行完成之后再进行编译就好了。
Qt Creator可能没有反应过来你添加的代码。需要使用Qt Creator的 Build->clean all 然后一定要删除build-×××-Debug下面的Makefile文件 然后使用Build->Build All 就额可以了。 更有效的方法: 从工程中移除报错的源文件。重新编译成功后。再次添加报错的源文件。
bool QObject::connect ( const QObject * sender, const char * signal, const QObject * receiver, const char * method, Qt::ConnectionType type = Qt::AutoConnection ) [static] Creates a connection of the given type from the signal in the sender object to the method in the receiver object...
a(library.o): In function `Library::Library(QString)': Makefile:214: recipe for target 'Application' failed /home/mint/Development/test/build-Library-Desktop_Qt_5_5_1_GCC_64bit-Ladění/../Library/library.cpp:6: undefined reference to `Library::name' collect2: error: ld returned 1 ...
Assigns the other icon to this icon and returns a reference to this icon.Related Non-MembersQDataStream & operator<< ( QDataStream & stream, const QIcon & icon )This is an overloaded member function, provided for convenience.Writes the given icon to the the given stream as a PNG image....
Appends the string str to this byte array. The Unicode data is converted into 8-bit characters using QString::toAscii().If the QString contains non-ASCII Unicode characters, using this function can lead to loss of information. You can disable this function by defining QT_NO_CAST_TO_ASCII...
Member Function Documentation Q3MainWindow::Q3MainWindow (QWidget*parent= 0, const char *name= 0,Qt::WindowFlagsf= Qt::WType_TopLevel ) Constructs an empty main window. Theparent,nameand widget flagsf, are passed on to theQWidgetconstructor. ...
QTDataReference QTDataReference 构造函数 属性 方法 EncodeTo FromDataRefData FromDataReference FromReference QTError QTErrorKey QTFileType QTFormatDescription QTImageAttributes QTMedia QTMediaType QTMovie QTMovie.Notifications QTMovieFileTypeOptions