45.QT-连接外部DLL,解决调用resolve失败原因

typedef BOOL (*Fun)(BOOL IsOpenComm,unsigned long Port,  unsigned long nBaud, unsigned int BeepCnt); //定义函数指针 
void func()
{
    
       Fun open=(Fun)mylib.resolve("MZ_Card.dll","SendBeep");    //援引函数
       if (open)                  //是否成功连接上函数
       {
                 qDebug()<<"Link to Function is OK!";
                 qDebug()<<open(true,19,38400,2);      //这里函数指针调用dll中的SendBeep函数
       }
       else
                 qDebug()<<"Linke to Function is not OK!!!!";
}

Fun open=(Fun)mylib.resolve("MZ_Card.dll","_SendBeep@16");