初学QT遇到不解问题 [复制链接]

总是提示：playerDialog.h：8：  error：expect  ‘）’before ‘*’token 。playerDialog(Qwidget *parent=0);这一行有错、到底是什么原因呢？怎么都看不出来，请高手指点一下
//playerDialog.h文件
#ifndef PLAYERDIALOG_H
#define PLAYERDIALOG_H
#include<QtGui>
class playerDialog:public QDialog
{
 //   Q_OBJECT
    public:
    playerDialog(Qwidget *parent=0);
    private:
    QPushButton *startPushButton;
};
#endif

//playerDialog.cpp文件
#include"playerDialog.h"
playerDialog::playerDialog(Qwidget *parent)
:QDialog(parent)
{
    setWindowTitle(tr("MP3"));
    setFixedHeight(sizeHint().height());
    startPushButton = new QPushButton(tr("start"));
    connect(startPushButton,SIGNAL(clicked()),this,SLOT(close()));
  }

//main.cpp文件
#include<QApplication>
#include"playerDialog.h"
int main(int argc,char *argv[])
{
 QApplication app(argc,argv);
 playerDialog *player=new playerDialog;
 player->show();
 return app.exec();
}

错误：   playerDialog(Qwidget *parent=0);
正确：    playerDialog(QWidget *parent=0);