qt 信号与槽

绑定信号与槽时记得绑定在俩都初始化后。
如：

#include "ccmychardialog.h"
public slots:
    void ccmyclose();

emit myclose();

#include "dialog.h"
public slots:
    void ccmyclose();
        myCCmyCharDialog = new CCmyCharDialog(tcpSocket);
    //绑定关闭信号与槽
         connect(myCCmyCharDialog,SIGNAL(myclose()),this,SLOT(ccmyclose()));

不然绑定不了报：

QObject::connect: Cannot connect (null)::myclose() to Dialog::ccmyclose()

原文地址：http://blog.51cto.com/haidragon/2093552