qt传递函数作为全局变量

api.h

#ifndef API_H
#define API_H
typedef void (*ReqCallBack)(QByteArray data);//声明函数指针类型
#endif // API_H

HttpThread.h

#ifndef HTTPTHREAD_H
#define HTTPTHREAD_H
#include "utils/api.h"
class HttpThread : public QThread{
    
    
    Q_OBJECT

public:
    ReqCallBack mReqCallBack;
#endif // HTTPTHREAD_H