Tips in Writing Namespace Extension (III) - Drag and Drop objects between System Namespace and your NSE

#ifndef _CNWSPIDLMGR_H_
#define _CNWSPIDLMGR_H_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

typedef	enum tagITEM_TYPE
{
	NWS_FOLDER=0x00000001,
	NWS_FILE=0x00000002,
}ITEM_TYPE;

typedef struct tagPIDLDATA
   {
   ITEM_TYPE type;
   TCHAR    szName[1];
   }PIDLDATA, FAR *LPPIDLDATA;

class CNWSPidlMgr
{
public:

	LPITEMIDLIST Create(ITEM_TYPE iItemType,LPTSTR szName);
	void Delete(LPITEMIDLIST pidl);
	LPITEMIDLIST GetNextItem(LPCITEMIDLIST pidl);
	LPITEMIDLIST GetLastItem(LPCITEMIDLIST pidl);
	UINT GetByteSize(LPCITEMIDLIST pidl);
	bool IsSingle(LPCITEMIDLIST pidl);
	LPITEMIDLIST Concatenate(LPCITEMIDLIST, LPCITEMIDLIST);
	LPITEMIDLIST Copy(LPCITEMIDLIST pidlSrc);
	
	// Retrieve encrypted file name (without the path)
	// The pidl MUST remain valid until the caller has finished with the returned string.
	HRESULT GetName(LPCITEMIDLIST,LPTSTR);

	// Retrieve the item type (see above)
	ITEM_TYPE GetItemType(LPCITEMIDLIST pidl);
	
	HRESULT GetFullName(LPCITEMIDLIST pidl,LPTSTR szFullName,DWORD *pdwLen); 
	BOOL  HasSubFolder(LPCITEMIDLIST pidl); 
	HRESULT GetItemAttributes(LPCITEMIDLIST pidl,USHORT iAttrNum,LPTSTR pszAttrOut);

private:
	LPPIDLDATA GetDataPointer(LPCITEMIDLIST);

};

#endif//_CNWSPIDLMGR_H_