关于IDataObject接口的问题！

[zwjchina]

IDataObject有个方法GetData
其声明如下
HRESULT GetData(
FORMATETC * pFormatetc, //Pointer to the FORMATETC structure
STGMEDIUM * pmedium //Pointer to the STGMEDIUM structure
);

对于STGMEDIUM结构的说明，MSDN上的资料如下：
STGMEDIUM
The STGMEDIUM structure is a generalized global memory handle used for data transfer operations by the IAdviseSink, IDataObject, and IOleCache interfaces.

typedef struct tagSTGMEDIUM
{
DWORD tymed;
[switch_type(DWORD), switch_is((DWORD) tymed)]
union {
[case(TYMED_GDI)] HBITMAP hBitmap;
[case(TYMED_MFPICT)] HMETAFILEPICT hMetaFilePict;
[case(TYMED_ENHMF)] HENHMETAFILE hEnhMetaFile;
[case(TYMED_HGLOBAL)] HGLOBAL hGlobal;
[case(TYMED_FILE)] LPWSTR lpszFileName;
[case(TYMED_ISTREAM)] IStream *pstm;
[case(TYMED_ISTORAGE)] IStorage *pstg;
[default] ;
};
[unique] IUnknown *pUnkForRelease;
}STGMEDIUM;
typedef STGMEDIUM *LPSTGMEDIUM;

Members
tymed
Type of storage medium. The marshaling and unmarshaling routines use this value to determine which union member was used. This value must be one of the elements of the TYMED enumeration.
union member
Handle, string, or interface pointer that the receiving process can use to access the data being transferred. If tymed is TYMED_NULL, the union member is undefined; otherwise, it is one of the following:
hBitmap

Bitmap handle. The tymed member is TYMED_GDI.

hMetaFilePict

Metafile handle. The tymed member is TYMED_MFPICT.

hEnhMetaFile

Enhanced metafile handle. The tymed member is TYMED_ENHMF.

hGlobal

Global memory handle. The tymed member is TYMED_HGLOBAL.

lpszFileName

Pointer to the path of a disk file that contains the data. The tymed member is TYMED_FILE.

pstm

Pointer to an IStream interface. The tymed member is TYMED_ISTREAM.

pstg

Pointer to an IStorage interface. The tymed member is TYMED_ISTORAGE.

pUnkForRelease
Pointer to an interface instance that allows the sending process to control the way the storage is released when the receiving process calls the ReleaseStgMedium function. If pUnkForRelease is NULL, ReleaseStgMedium uses default procedures to release the storage; otherwise, ReleaseStgMedium uses the specified IUnknown interface.

但是，对于hGlobal类型，那块内存数据的具体格式却没讲，
我现在是想做OLE拖动，也就是从桌面，或者资源管理器里面拖文件到我的程序的主窗口
希望获得拖动的文件的信息。
所以很希望知道hGlobal的具体格式说明！谢谢了，解决问题后200分丰上。

[zwjchina]

我已经实现了在98下获取出拖放的文件的路径，但是同一个程序在2000下却得不到正确的路径，所以想了解一下具体的内存格式。

[zwjchina]

这些我已经解决了98下获取就是通过以上方法，2000下我也明白了
是因为宽字符的原因，但是我希望知道这一系列的格式说明。
例如拖放的是一段html,或者Word的文字等等。

[halfdream]

http://expert.csdn.net/Expert/topic/1301/1301565.xml?temp=.2632257