* Creates an OleAutomation object for the specified progID.

 * 

 * @param progID ActiveX Component whose additional functionality you need to access

 *        

 * @exception SWTException <ul>

 *     <li>ERROR_CANNOT_CREATE_OBJECT when failed to create OLE Object

 *     <li>ERROR_INTERFACE_NOT_FOUND when unable to create callbacks for OLE Interfaces

 *  </ul>

 *

 * @note This follows the pattern of what is done in 

 * COleDispatchDriver::CreateDispatch(REFCLSID clsid, COleException* pError)

 */

 public OleAutomation(String progID) {

     GUID rclsid = getClassID(progID);

     int[] ppvObject = new int[1];

     int result = COM.CoCreateInstance(rclsid, 0, COM.CLSCTX_INPROC_HANDLER | COM.CLSCTX_INPROC_SERVER | COM.CLSCTX_LOCAL_SERVER | COM.CLSCTX_REMOTE_SERVER, COM.IIDIUnknown, ppvObject);

     if (COM.E_INVALIDARG == result) {

         //Last try.  If it doesn't work here, stop going any further

         result = COM.CoCreateInstance(rclsid, 0, COM.CLSCTX_INPROC_HANDLER, COM.IIDIUnknown, ppvObject);         

         if (result != COM.S_OK)

             OLE.error(OLE.ERROR_CANNOT_CREATE_OBJECT, result);

     } else if (result != COM.S_OK)

         OLE.error(OLE.ERROR_CANNOT_CREATE_OBJECT, result);

     IUnknown objIUnknown = new IUnknown(ppvObject[0]);

     int[] ppvObject2 = new int[1];

     if (objIUnknown.QueryInterface(COM.IIDIDispatch, ppvObject2) != COM.S_OK) {

         objIDispatch = null;

         OLE.error(OLE.ERROR_INTERFACE_NOT_FOUND);

     }

     objIDispatch = new IDispatch(ppvObject2[0]);

     int[] ppv = new int[1];

     result = objIDispatch.GetTypeInfo(0, COM.LOCALE_USER_DEFAULT, ppv);

     if (result == OLE.S_OK) {

         objITypeInfo = new ITypeInfo(ppv[0]);

         objITypeInfo.AddRef();

     }

 }

/*

 * This has been copied from org.eclipse.swt.ole.win32.OleClientSite

 */

 protected GUID getClassID(String clientName) {

     // create a GUID struct to hold the result

     GUID guid = new GUID();

     // create a null terminated array of char

     char[] buffer = null;

     if (clientName != null) {

         int count = clientName.length();

         buffer = new char[count + 1];

         clientName.getChars(0, count, buffer, 0);

     }

     if (COM.CLSIDFromProgID(buffer, guid) != COM.S_OK){

         int result = COM.CLSIDFromString(buffer, guid);

         if (result != COM.S_OK)

             OLE.error(OLE.ERROR_INVALID_CLASSID, result);

     }

     return guid;

 }

/**