QT--------QLineEdit

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#include<QApplication>#include<QLineEdit>#include<QCompleter>int main(int argc,char* argv[]){    QApplication app(argc,argv);//1    QWidget w;//2  构造一个窗口    w.setWindowTitle("Hello World!");//设置窗口标题    QLineEdit edit;    edit.show();    edit.setParent(&w);    /*输入密码*/    //显示输入密码的样子LineEdit有四种显示模式        //Normal NoEcho PassWord PasswordEchoOnEdit        //edit.setEchoMode(QLineEdit::Password);//1        //edit.text();        //edit.setEchoMode(QLineEdit::NoEcho);//2        //edit.setEchoMode(QLineEdit::PasswordEchoOnEdit);//3    /*输入密码提示*/    //edit.setPlaceholderText("Please input text");   /*补全*/    QCompleter completer(QStringList() << "aab"<< "1122" << "998");    //completer.setFilterMode(Qt::MatchContains);有错误    edit.setCompleter(&completer);    w.show();//3默认情况下隐藏，需要用show显示出来    /*发送信号的对象  发送对象  接收信号的对象  要执行的槽*/    //QObject::connect(&button,SIGNAL(clicked()),&w,SLOT(close()));    return app.exec();//4}

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