ISoftUSBConfigurations::Unlock Method

项目
09/21/2010

The Unlock method re-enables changes to a collection after your previously called ISoftUSBConfigurations::Lock.

Syntax

HRESULT Unlock();

Parameters

This method has no parameters.

Return Value

Unlock returns an HRESULT value. This method returns S_OK if the collection is successfully unlocked.

Remarks

The following C++ code example shows how to unlock an ISoftUSBConfigurations collection.

HRESULT CTestDevice::GetConfigurationEnum(IUnknown *punk)
{
    HRESULT             hr = S_OK;
 ISoftUSBConfigurations  *piConfigList = NULL;

    // Get the configuration list
 hr = m_piDevice->get_Configurations(&piConfigList);
 if (FAILED(hr))
    {
 goto Exit;
    }

        // Lock the collection
 hr = piConfigList->Lock();
 if (FAILED(hr))
 goto Exit;

    // Get the enumerator for the collection
 hr = piConfigList->get__NewEnum(&punk);
 if(FAILED(hr))
 goto Exit;

 hr = piConfigList->Unlock();
 if (FAILED(hr))
 goto Exit;

Exit:
 if( NULL != piConfigList)
{
  piConfigList->Release();
  piConfigList = NULL;
}
 return hr;
}

Requirements

Header

SoftUSBif.h

通过