Read LogFileDirectory and Path properties using C++/ADSI
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Read LogFileDirectory and Path properties using C++/ADSI

Areas>Languages>C++

On the latest work at iisproxy project I want to read some metabase properties from IIS ISAPI filter - properties LogFileDirectory and RootPath of the specified instance ID. This sample c++ function contains the ADsGetObject + QueryInterface calls and Get property calls for IIsWebServer and IIsWebDirectory object interfaces.

class cIISWebInfo {
public:
	string RootPath;
	string LogFileDirectory;
};

//the function reads LogFileDirectory and Path properties
// of an IIS instance using ADSI
HRESULT GetAppRootPaths( DWORD InstanceID, cIISWebInfo *IISWebInfo ) {
  HRESULT hr = CoInitialize( NULL );

if ( SUCCEEDED( hr ) ) {
    USES_CONVERSION;

CComPtr<IADs> pADs;
    CComPtr<IISApp2> pApp2;
    WCHAR ADSIPath[50];

//Get the IIsWebServer object - IIS://localhost/w3svc/xxx
    wsprintfW( ADSIPath, L"IIS://localhost/w3svc/%d", InstanceID );
    hr = ADsGetObject( ADSIPath, IID_IADs, (void **)&pADs );

if ( SUCCEEDED( hr ) ) {
      //Get a log file directory.

CComBSTR bstrVarname(L"LogFileDirectory");
      CComVariant varLogFileDirectory;

hr = pADs->Get( bstrVarname, &varLogFileDirectory );
      if ( SUCCEEDED( hr ) ) 
            IISWebInfo->LogFileDirectory = OLE2T( varLogFileDirectory.bstrVal );

};

pADs = NULL;

//Get the IIsWebDirectory object - IIS://localhost/w3svc/xxx/root
    wsprintfW( ADSIPath, L"IIS://localhost/w3svc/%d/root", InstanceID );
    hr = ADsGetObject( ADSIPath, IID_IADs, (void **)&pADs );
    if ( SUCCEEDED( hr ) ) {
      //Read the root folder of the IIsWebDirectory
      hr = pADs->QueryInterface( IID_IISApp2, (void **)&pApp2 );
      if ( SUCCEEDED( hr ) ) {
        CComBSTR bstrVarname = L"Path";
        CComVariant varAppRootPath;

hr = pApp2->Get( bstrVarname, &varAppRootPath );
        if ( SUCCEEDED( hr ) ) 
          IISWebInfo->RootPath = OLE2T( varAppRootPath.bstrVal );

}; //SUCCEEDED( hr ) - IID_IISApp2

};//SUCCEEDED( hr ) - IID_IADs
  };//SUCCEEDED( hr ) - CoInitialize( NULL );

CoUninitialize();
  return hr;  
}

See also for 'Read LogFileDirectory and Path properties using C++/ADSI' article:

Get Instance ID from IIS Filter context (SF_REQ_GET_PROPERTY - SF_PROPERTY_INSTANCE_NUM_ID) Short sample to get an IIS property using ServerSupportFunction

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