no such slot Qt错误

[lengchanguo]

在编译Qt程序的时候出现No such slot ....的错误 有Q_OBJECT
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);

this->setWindowFlags(Qt::FramelessWindowHint);//去掉标题栏
QPalette palette1=this->palette();
palette1.setBrush(QPalette::Window,QBrush(QPixmap("./images/background.png")));
this->setPalette(palette1);
this->setAutoFillBackground(true);
//加入背景图片
myCom = new Posix_QextSerialPort("/dev/ttyS0",QextSerialBase::Polling);//定义串口对象，指定串口名和查询模式


this->threadSendMessage =new ThreadSendMessage;
this->threadSendMessage->start();
QObject::connect(threadSendMessage, SIGNAL(send1(QString)),
threadSendMessage, SLOT(sendmotor(QString)));
QObject::connect(threadSendMessage, SIGNAL(send2(QString)),
threadSendMessage, SLOT(sendbuzzer(QString)));


class Widget : public QWidget {
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();

protected:
void changeEvent(QEvent *e);

public:
Ui::Widget *ui;
Posix_QextSerialPort *myCom;
ThreadSendMessage *threadSendMessage;
QTimer *readTimer;
QTimer *readTimer1;
QTimer *readTimer3;
QTimer *readTimer2;
//int SendMsg();
//void addNum(char key);
public slots:
void sendmotor(QString);
void sendbuzzer(QString);

程序片段在这了 求教各位大侠

[超开心~]

应该先connect在start吧

[超开心~]

而且信号接收者应该是this而不是threadSendMessage

[jdwx]

需要看看threadSendMessage的头文件，有没有声明信号和槽呢？ 都是在一个类里面没有必要使用信号和槽吧？而且信号也不是Qt提供的，是自己定义的。

[lengchanguo]

谢谢楼上的 我忽略了这个了 不过start可以放在前面的