QThread: Destroyed while thread is still running

最近发现代码有问题 QThread: Destroyed while thread is still running
线程snap_thread.cpp

 Snap_thread::Snap_thread(QLabel *pb) :QThread()
{
    isRunning = true;
    udp_fd = -1;
    this->pb = pb;
}


void Snap_thread::run()
{

   run_socket();

}

void Snap_thread::run_socket()
{
    int len;
    char sendbuf[256];
    //sendto中使用的对方地址
    struct sockaddr_in toAddr;
    //在recvfrom中使用的对方主机地址
    struct sockaddr_in fromAddr;
    unsigned int fromLen;
    char recvBuffer[128];
    udp_fd = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
    if(udp_fd < 0)
    {
       printf("创建套接字失败了.\r\n");
       return;
    }

    //memset()函数
    memset(&toAddr,0,sizeof(toAddr));
    toAddr.sin_family=AF_INET;
    //对方的地址和对方的主机port
    toAddr.sin_addr.s_addr=inet_addr("127.0.0.1");
    toAddr.sin_port = htons(this->port);
    sendbuf[0]=0x1;

    if(flag_video_press_num == GUIONTIMEONE)
    {
       str = qpath;
       str += "/car.jpg";
    }
    else if(flag_video_press_num == GUIONTIMETWO)
    {
       str = qpath;
       str += "/goods.jpg";
    }

    strcpy(&sendbuf[1],path);
    if((len=sendto(udp_fd,sendbuf,strlen(path)+2,0,(struct sockaddr*)&toAddr,sizeof(toAddr))) != strlen(path)+2)
    {
       printf("sendto() 函数使用失败了.\r\n");
    }

    printf("%d has sent %d bytes\n",this->port,len);

    fromLen = sizeof(fromAddr);
    if(recvfrom(udp_fd,recvBuffer,128,0,(struct sockaddr*)&fromAddr,&fromLen)<0)
    {
       printf("recvfrom()函数使用失败了.\r\n");
    }

    if(recvBuffer[0] == 2)
    {
       if(recvBuffer[1] == 1)
       {
          this->pb->setText("截图成功");
       }
       else if(recvBuffer[1] == -1)
       {
          this->pb->setText("文件名错误");
       }
       else
       {
          this->pb->setText("存储错误");
       }

    }
    close(udp_fd);
    udp_fd = -1;
}

Snap_thread::~Snap_thread(){}

void Snap_thread::setPort(int port)
{
   this->port = port;
}
void Snap_thread::setPath(QString path)
{
   this->qpath = "/mnt/ftp/";
   qpath += path;
}
void Snap_thread::stop()
{
   std::cout<<"this is stop!"<<std::endl;
   this->isRunning = false;
   if(udp_fd >= 0)
   {
       close(udp_fd);
   }
   this->quit();
}

在主线程调用代码如下

         snap = new Snap_thread(ui->label_toast);
         snap->setPort(6000);
         snap->setPath(snap_save_path);
         snap->start();


                ...

                if(snap->isRunning)
         {
             snap->stop();
             delete snap;
             snap = NULL;
         }

现在报 QThread: Destroyed while thread is still running
还有可能直接导致程序崩溃，我应该如何改成呢？

https://www.baidu.com/link?url=w4y8Hwa7jnM3wtqJn1fIkcF83R-E_LltNbrr2o6FJz9BoAxennzIYovALA1P141KoxtJfD6I_GfQUuE5VmH9QAi9eMDXp6l7OlRcXgKSbg5Er-AddORupSjOlfiZ8PiS9_sC6U-a-bkTg2GZQ8kMVMz9Z6L5h0z1Wc9BJCpH0wG&wd=&eqid=8d4c2823000308d10000000458b92568

在snap->start();后面，调用snap->exec()，就好了，你试试