结构或大内存块打包的办法（中）

The information in this article applies to:

- Microsoft Visual C++ 6.0,SP5

Version

Date

Creator

Description

1.0.0.1

2004-2-23

郑昀

草稿

// 函数名：LoadStreamOnHugeMemory

// 功能：  同上

// 第一个参数pvMem指向一块要打包的内存，第二个参数指明这块内存的大小

HRESULT LoadStreamOnHugeMemory(void pvMem, ULONG cbSize)

{

     // Get Memory Handle:

     HGLOBAL h = GlobalAlloc(GMEM_MOVEABLE, cbSize);

     If(NULL == h) return E_OUTOFMEMORY;

     LPVOID pv = GlobalLock(h);

     If(!pv) return E_OUTOFMEMORY;

     // Copy to memory block

     CopyMemory(pv, pvMem, cbSize);

     CComPtr<IStream> spStream;

     // Create stream on Memory:

     HRESULT hr = CreateStreamOHGlobal(h, TRUE, &spStream);

     If(FAILED(hr))

     {

          GlobalUnlock(h);

          GlobalFree(h);

          return hr;

     }

     // stream now owns the memory

// unlock the data

GlobalUnlock(hGlobal);

// Create a stream holder. Load the stream holder from the global stream.

//  THIS STREAM HOLDER IS INTERITED FROM IPersistStream

//  And all virtual functions are Modified to handle the object....

CComPtr <IStreamHolder> pHolder = new CComObject <CStreamHolder>;

CComPtr <IPersistStream> pHolderStream;

hr = pHolder->QueryInterface (IID_IPersistStream, (void **)&pHolderStream);

pStream->Seek( zero, STREAM_SEEK_SET, NULL );

pHolderStream->Load(pStream);

CComVariant vComData = pHolder;

.. ..

//

// now, you have a big chunk of memory loaded into a ComVariant

//

// 现在你可以把打包后的CComVariant传递给MSMQMessege的Body属性了：

pisMsg->Body = vComData;

.. ..

}

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