IWMDMOperation::End method (mswmdm.h)

Article
02/22/2024

The End method indicates that a read or write operation is finished, whether successful or not, and it returns a completion code.

Syntax

HRESULT End(
  [in] HRESULT  *phCompletionCode,
  [in] IUnknown *pNewObject
);

Parameters

[in] phCompletionCode

Completion code for the operation.

[in] pNewObject

When sending to a device, a pointer to a new IWMDMStorage object representing the new object that has been sent to the device. When reading from a device, a pointer to the IWMDMStorage object that was read from the device.

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

For an extensive list of possible error codes, see Error Codes.

Remarks

The End method is called whether or not the transfer was successful, and is the last IWMDMOperation method called. This method can be used to signal the application to close all file handles and other objects required by the read or write operation.

Examples

The following C++ code closes a global file handle after a read or write action, and outputs a message.


HRESULT End(HRESULT* phCompletionCode, IUnknown* pNewObject)
{
    // TODO: Display the message: "IWMDMOperation event--End."

    // Close the file handle now that we're done with it.
    if (m_File != INVALID_HANDLE_VALUE)
        if (!CloseHandle(m_File))
            // TODO: Display the message: "Couldn't close the file."

    // Reset global status flag.
    m_OperationStatus = OPERATION_UNINITIALIZED;
    return S_OK;
}

Requirements

Requirement	Value
Target Platform	Windows
Header	mswmdm.h
Library	Mssachlp.lib

Share via