IMDSPObject::Open (deprecated)
This is preliminary documentation and subject to change.
This topic documents a feature of the Windows Media Device Manager SDK. We recommend that you migrate your application to use the Windows Portable Devices API. For more information, see the Windows Portable Devices SDK.
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(
UINT fuMode
);
Parameters
fuMode
[in] 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 Values
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
For an extenstive list of possible error codes, see Error Codes.
Possible values include, but are not limited to, those in the following table.
Return code | Description |
S_OK | The method succeeded. |
WMDM_E_BUSY | The media device is busy. |
ERROR_TOO_MANY_OPEN_FILES | Cannot open any more files. |
WMDM_E_INTERFACEDEAD | The file or folder was previously deleted. |
E_INVALIDARG | The fuMode parameter is an invalid or NULL pointer. |
E_FAIL | An unspecified error occurred. |
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
Header: Defined in mswmdm.h.
Library: mssachlp.lib
See Also