Count Property

项目
09/21/2010

The Count property returns the current count of objects in a collection of SoftUSBConfiguration objects. This property is read-only.

This property is read-only.

Syntax

HRESULT get_Count(
  [out, retval]  long *plCount
);

Property Value

Caller-allocated space to hold the current value of the Count property.

Error Codes

Count returns an HRESULT value. This property returns S_OK if the count is correctly returned and E_POINTER if the *plCount parameter is not a valid pointer.

Remarks

The following C++ code example shows how to get how many objects are in an ISoftUSBConfigurations collection.

HRESULT CTestDevice::GetConfigurationCount(LONG *plCount)
{
HRESULT hr = S_OK;
ISoftUSBConfigurations  *piConfigList = NULL;

 
`//Initialize the incoming variable
 if(NULL != plCount)
           {
 *plCount = 0;
} 
else
{
 goto Exit;
}
hr = m_piDevice->get_Configurations(&piConfigList);
if(!FAILED(hr))
{
hr = piConfigList->get_Count(plCount);
}
 
`

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

Requirements

Header

SoftUSBif.h

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Build date: 9/21/2010

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