IMDSPObject::Open method (mswmdm.h)
The Open method opens the associated object and prepares it for Read or Write operations. This operation is valid only if the storage object represents a file.
Syntax
HRESULT Open(
[in] UINT fuMode
);
Parameters
[in] fuMode
Mode in which the file must be opened. It must be one of the following two values.
| Value | Description |
|---|---|
| MDSP_READ | Query whether a subsequent call to Read would be allowed. |
| MDSP_WRITE | Query whether a subsequent call to Insert would be allowed. |
Return value
The method returns an HRESULT. All the interface methods in Windows Media Device Manager can return any of the following classes of error codes:
- Standard COM error codes
- Windows error codes converted to HRESULT values
- Windows Media Device Manager error codes
Remarks
If the underlying file-system does not support opening of multiple files at the same time, the service provider should gracefully the return Win32 error code ERROR_TOO_MANY_OPEN_FILES, if the client attempts to open more than one file at a time.
This method must be implemented. It must not return WMDM_E_NOTSUPPORTED or E_NOTIMPL. For more information, see Mandatory and Optional Interfaces.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | mswmdm.h |
| Library | Mssachlp.lib |