QT--------QLineEdit

#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
}