dynamic_cast这东西怎么用？

[dadafeng]

UINT MyClass::_bogusCal(LPVOID pParam)
{
MyClass* This;
This = dynamic_cast<MyClass*>(pParam);
return This->Calculate();
}
为何编译不通过

[guopo]

pParam must be a MyClass type.

[dadafeng]

dynamic_cast（pParam)
这样可以嘛？
书上的原嘛时这样写的

[dadafeng]

谁能耐心给俺讲讲，抓耳挠腮中！！

[Stephen_Ma]

if that is MyClassB : public MyClass;
and if pParam is a MyClassB* type, you can use
MyClass* This;
This = dynamic_cast<MyClass*>(pParam);

As the case you want to do, I think you'd better do as the follow:
MyClass* This;
This = (MyClass*)pParam;

[一大梨]

简单的说，dynamic_cast用于安全的沿类的继承关系向下进行类型转换，understand?

[dadafeng]

我是想学一下线程的编写，但是遇到个问题：MFC好像不允许线程函数和调用函数在同一个类里面。于是在书上找到一则解决方法示例：
class XMyThread
{
public:
void StartThread(void);
virtual UINT ThreadFunction(void);
static UINT __bogusthreadfunc(LPVOID lpparam);
};
void XMyThread::StartThread()
{
AfxBeginThread(__bogusthreadfunc,this);
}
UINT XMyThread::ThreadFunction(void)
{
//here you do all your real work
return 0;
}
UINT XMyThread::__bogusthreadfunc(LPVOID lpparam)
{
XMyThread* This = dynamic_cast(lpparam);//这里是不是有问题？？？
return This->ThreadFunction();
}

使用this = （XMyThread）lpparam 也不正确，会返回空指针
不懂是怎么回事了，我想在同一个类里面同时定义调用函数和被调用函数如何解决