Attributes Property

项目
09/21/2010

The Attributes property gets or sets the bmAttributes field of the endpoint descriptor, as described in section 9.6.6 of the USB 2.0 specification.

This property is read/write.

Syntax

HRESULT put_Attributes(
  [in]           BYTE bAttributes
);

HRESULT get_Attributes(
  [out, retval]  BYTE *pbAttributes
);

Property Value

The new attribute to set in the endpoint.

Error Codes

Attributes returns S_OK if the operation succeeds or E_POINTER if the pbAttributes parameter is not a valid pointer.

Remarks

The following C++ code example shows how to set and get the Attributes property.

HRESULT  CLoopBackDevice::UpdateEndpointAttributes(ISoftUSBEndpoint *piEndpoint)
{
HRESULT hr = S_OK;
BYTE        bAttributes = 0;

if(NULL == piEndpoint)
{
 hr = E_INVALIDARG;
 goto Exit;
}

/ Get the current attributes
hr = piEndpoint->get_Attributes(&bAttributes);
if(FAILED(hr))
 goto Exit;

// Update the attributes if required
if (0x02 != bAttributes)
{
  // Set the endpoint to a BULK endpoint
 bAttributes = 0x02;
 hr = piEndpoint->put_Attributes(bAttributes);
 if(FAILED(hr))
 goto Exit;
}

Exit:
return hr;
}

Requirements

Header

SoftUSBif.h

通过