why this header file has no error?

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C++

I get a piece of c++ example project. I copy a header file into myself project from the example project.the content of the header file is below:

#ifndef _SAFEARRAYHELPER_H_
#define _SAFEARRAYHELPER_H_

class CSafeArrayHelper
{
	public:
		CSafeArrayHelper();
		~CSafeArrayHelper();

	bool Create(VARTYPE  vt, UINT  cDims, UINT lBound, UINT cCount);
	bool Destroy();
	UINT GetDimension();

	bool Attach(LPSAFEARRAY psa);
	bool AttachFromVariant(VARIANT* pVariant);
	LPSAFEARRAY Detach();
	LPSAFEARRAY GetArray();
	bool AccessData(void FAR* FAR* pvData);
	bool UnaccessData();
	bool Lock();
	bool Unlock();
	bool PutElement(long lIndices, void FAR* vData);
	bool GetElement(long lIndices, void FAR* vData);
	VARIANT GetAsVariant();

	protected:
	LPSAFEARRAY	m_pSA;

	private:
};

#endif // _SAFEARRAYHELPER_H_

and there are many error like that;

1>g:\c++_code\driver1\safearrayhelper.h(10): error C2061: 语法错误: 标识符"VARTYPE"
1>g:\c++_code\driver1\safearrayhelper.h(12): error C2146: 语法错误: 缺少";"(在标识符"GetDimension"的前面)

But there is no error in the example.
why there are no definion of "VARTYPE" "LPSAFEARRAY",but there is no error in the exampl project.
-kkklko