昨天以为编译通过了结果今天调试老是断错误

class CSerial
{

private:
//int m_fd;
float jingdu;
float weidu;
pthread_t m_thread;                                 
        static void* ReceiveThreadFunc(void* lparm);                

public:
CSerial(){}                                          
virtual ~CSerial(){}     

         int m_fd;                                    
char DatBuf[512];                                   
int m_ExitThreadFlag;                           
      
        
        int OpenPort(int nPort,int nSpeed,int nBits,int nEvent,int nStop);
               
        int ClosePort();
                
        int WritePort(char *Buf,int len);
               
virtual int PackagePro(char* Buf,int len);

};

void* CSerial::ReceiveThreadFunc(void* lparm)
{      
CSerial *pSer=(CSerial*)lparm;
        int nread;
        fd_set rd;
        FD_ZERO(&rd);
        FD_SET(pSer->m_fd,&rd);
printf("%dn",pSer->m_fd);
        while(FD_ISSET(pSer->m_fd,&rd))
   {
         if(select((pSer->m_fd)+1,&rd,NULL,NULL,NULL)m_fd,pSer->DatBuf,512))>0)
   {       
         char *p;
                 int n;
while((p=strstr(pSer->DatBuf,"$GPRMC"))!=NULL)
{
for(n=0;nweidu,&pSer->jingdu);
printf("%f %fn",pSer->weidu,pSer->jingdu);
}

                         }      
                        
     }


         }
  }
这个是OpenPort里创建的线程函数    int ret=pthread_create(&m_thread,NULL,ReceiveThreadFunc,NULL);

结果是前面串口设置打开都正常 进入线程函数后发生段错误 CSerial *pSer=(CSerial*)lparm;我觉的是指针问题 C++不熟谁帮我解释下

你在开线程时的语句里int ret=pthread_create(&m_thread,NULL,ReceiveThreadFunc,NULL);对参数传的是NULL。那么lparm就等于NULL。必然会造成后面的程序崩溃。