use of undeclared identifier 'connect'参考以上网址,问题在于自己定义的类没有继承weiget,所以也就没有connect这个函数。在定义类时加上对weiget的继承即可
系统提示 use of undeclared identifier ' 某个变量' 一般可能是.h文件中没有定义此变量,如果检查头文件后发现也定义了。 但是还是出现这个问题,就需要检查下报错的这个方法名前增加类的名称 在把类名包含后,就不报错了
代码如下: 1#include"mainwindow.h"2#include<iostream>3#include <QApplication>45intmain(intargc,char*argv[])6{7QApplication a(argc, argv);8MainWindow w;9w.show();1011std::cout <<"hello world"<<std::endl;1213returna.exec();14} 此时错误警告消失,但是仍无窗口输出; 在qt的工程文件(.pro...
1、报错 " Unknown type name 'XXXXX' "或" Use of undeclared identifier 'XXXXX' (fix available) "之类,如下图 Ctrl + 鼠标一步步找下去或许会出现下面提示,或找不到头文件,右侧上面的指向Qt5,下面是指向Qt6,网上找了非常多教程都不能解决,大多都是windows下面找不到库的解决方式,linux下添加"includePath...
7 connect(tcpClient,SIGNAL(readyRead()),this,SLOT(ReadData()));8//头⽂件要声明SLOT，这⾥不写了 9//出现connect报错："use of undeclared identifier 'connect'"10//解决⽅案：增加基类public QObject 11//我的是这样写class tcpComm:public ibasecomm,public QObject 12 } 13 14void myClass...
To find the use of a specific symbol orQML componentin your Qt C++ or Qt Quick project: In the editor, place the cursor on the symbol or component, and select: Tools > C++ > Find Usages Tools > QML/JS > Find Usages Ctrl+Shift+U ...
In order to parse standalone documents that do use undeclared namespace prefixes, you can turn off namespace processing completely with the namespaceProcessing property. Incremental parsing QXmlStreamReader is an incremental parser. It can handle the case where the document can't be parsed all at...
com->connect(x,9600,spNONE);//comInitialisation else printf("ErrorSettingCOM"); }else{//OpenninigFSUIPCfailed printf("CapSim:FailedtoopenlinktoFSUIPC:%s\n",pszErrors[dwResult]); FSUIPC_Close();//Closingwhenitwasn'topenisokay,sothisissafehere ...
Application.cxx:165: error: (Each undeclared identifier is reported only once for each function it appears in.) Application.cxx:170: error: `Graphic3d_NOM_BRONZE' undeclared (first use this function) Application.cxx:175: error: `Graphic3d_NOM_COPPER' undeclared (first use this function) Applic...
()': C:/src/qtbase/kdebindings/generator/parser/parsesession.cpp:42:10: warning: poss ible problem detected in invocation of delete operator: [enabled by default] C:/src/qtbase/kdebindings/generator/parser/parsesession.cpp:42:10: warning: inva lid use of incomplete type 'struct rpp::...