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CreateStreamOnHGlobal

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This function creates a stream object stored in global memory.

WINOLEAPI CreateStreamOnHGlobal(
  HGLOBAL hGlobal,
  BOOL fDeleteOnRelease,
  LPSTREAM* ppstm
);

Parameters

  • hGlobal
    [in] Memory handle allocated by the GlobalAlloc function. The handle must be allocated as movable and nondiscardable. If the handle is to be shared between processes, it must also be allocated as shared. New handles should be allocated with a size of zero. If hGlobal is NULL, the CreateStreamOnHGlobal function internally allocates a new shared memory block of size zero.
  • fDeleteOnRelease
    [in] Whether the underlying handle for this stream object should be automatically freed when the stream object is released.
  • ppstm
    [out] Address of IStream* pointer variable that receives the interface pointer to the new stream object. Its value cannot be NULL.

Return Values

The following table shows the HRESULT values that can be returned by this function.

Value Description
S_OK The stream object was created successfully.
E_NOINTERFACE The specified interface is not supported.
E_OUTOFMEMORY The function failed.

Remarks

The CreateStreamOnHGlobal function creates a stream object in memory that supports the OLE implementation of the IStream interface. The returned stream object supports both reading and writing, is not transacted, and does not support locking.

The initial contents of the stream are the current contents of the memory block provided in the hGlobal parameter. If the hGlobal parameter is NULL, this function internally allocates memory.

The current contents of the memory block are undisturbed by the creation of the new stream object. Thus, you can use this function to open an existing stream in memory.

If the logical size of the stream is important, you should follow the call to this function with a call to the IStream::SetSize method.

After you have created the stream object with CreateStreamOnHGlobal, you can call GetHGlobalFromStream to get the global memory handle associated with the stream object.

To determine whether the platform supports this function, see Determining Supported COM APIs.

Requirements

OS Versions: Windows CE 2.0 and later.
Header: Ole2.h.
Link Library: Ole32.lib.

See Also

CreateStreamOnHGlobal | IStream | IStream | IStream::SetSize | GetHGlobalFromStream | COM APIs

Last updated on Wednesday, April 13, 2005

© 2005 Microsoft Corporation. All rights reserved.