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IDebugComPlusSymbolProvider::GetAttributedClassesinModule

  • Article

Retrieves the classes with the specified attribute in a given module.

Syntax

int GetAttributedClassesinModule (
    uint                 ulAppDomainID,
    Guid                 guidModule,
    string               pstrAttribute,
    out IEnumDebugFields ppEnum
);

Parameters

ulAppDomainID
[in] Identifier of the application domain.

guidModule
[in] Unique identifier of the module.

pstrAttribute
[in] The attribute string.

ppEnum
[out] Returns an enumeration of the attributed classes.

Return Value

If successful, returns S_OK; otherwise, returns an error code.

Example

The following example shows how to implement this method for a CDebugSymbolProvider object that exposes the IDebugComPlusSymbolProvider interface.

HRESULT CDebugSymbolProvider::GetAttributedClassesinModule(
    ULONG32 ulAppDomainID,
    GUID guidModule,
    __in_z LPOLESTR pstrAttribute,
    IEnumDebugFields** ppEnum
)
{
    HRESULT hr = S_OK;
    CComPtr<CModule> pModule;
    CComPtr<IMetaDataImport> pMetaData;
    Module_ID idModule(ulAppDomainID, guidModule);
    const void* pUnused;
    ULONG cbUnused;
    HCORENUM hEnum = 0;
    ULONG cTypeDefs = 0;
    ULONG cEnum;
    DWORD iTypeDef = 0;
    mdTypeDef* rgTypeDefs = NULL;
    IDebugField** rgFields = NULL;
    DWORD ctField = 0;
    CEnumDebugFields* pEnumFields = NULL;

    METHOD_ENTRY( CDebugSymbolProvider::GetAttributedClassesinModule );

    IfFalseGo( pstrAttribute && ppEnum , E_INVALIDARG );
    IfFailGo( GetModule( idModule, &pModule ) );
    pModule->GetMetaData( &pMetaData );

    IfFailGo( pMetaData->EnumTypeDefs( &hEnum,
                                       NULL,
                                       0,
                                       &cTypeDefs ) );

    IfFailGo( pMetaData->CountEnum( hEnum, &cEnum ) );
    pMetaData->CloseEnum(hEnum);
    hEnum = NULL;

    IfNullGo( rgTypeDefs = new mdTypeDef[cEnum], E_OUTOFMEMORY );
    IfNullGo( rgFields = new IDebugField * [cEnum], E_OUTOFMEMORY );

    IfFailGo( pMetaData->EnumTypeDefs( &hEnum,
                                       rgTypeDefs,
                                       cEnum,
                                       &cTypeDefs ) );

    for ( iTypeDef = 0; iTypeDef < cTypeDefs; iTypeDef++)
    {

        if (pMetaData->GetCustomAttributeByName( rgTypeDefs[iTypeDef],
                pstrAttribute,
                &pUnused,
                &cbUnused ) == S_OK)
        {
            if (CreateClassType( idModule, rgTypeDefs[iTypeDef], rgFields + ctField) == S_OK)
            {
                ctField++;
            }
            else
            {
                ASSERT(!"Failed to Create Attributed Class");
            }
        }
    }

    IfNullGo( pEnumFields = new CEnumDebugFields, E_OUTOFMEMORY );
    IfFailGo( pEnumFields->Initialize(rgFields, ctField) );
    IfFailGo( pEnumFields->QueryInterface( __uuidof(IEnumDebugFields),
                                           (void**) ppEnum ) );

Error:

    METHOD_EXIT( CDebugSymbolProvider::GetAttributedClassesinModule, hr );

    DELETERG( rgTypeDefs );

    for ( iTypeDef = 0; iTypeDef < ctField; iTypeDef++)
    {
        RELEASE( rgFields[iTypeDef] );
    }

    DELETERG( rgFields );
    RELEASE( pEnumFields );

    return hr;
}

See also