Taking images out of the body and putting into a filefield?

I can't imagine that this hasn't been done before, but we are having trouble accomplishing it. We're using Windows Live Writer to post a blog node through XML-RPC. When this is uploaded, we try to identify the images, strip them out, and add them to a cck filefield. It posts fine, but when you try to edit the post, it won't save. Can anyone see anything wrong with our code:

preg_match_all('/<img[^>]+>/i',$node->body, $result); 

                $img = array();

                    foreach( $result as $img_tag=>$img_tag_str)
                    {
                        
                        preg_match_all('/(src)=("[^"]*")/i',$img_tag_str[0], $img[$img_tag]);
                    }

                    
                foreach($img[0][0] as $imgstr) {
                    
                    $imgstring = $imgstr;
                    break;

                }

                // explode this now 
                $imgnamearr = explode("/", $imgstring) ;
                //get last array element
                $imgname =  $imgnamearr[count($imgnamearr) -1 ];
                //remove " character from the last of the string 
                $imgname = substr( $imgname, 0 , strlen( $imgname  )-1 );


 global $user;
                                 $mime = 'image/jpeg'; 

                                  $file_drupal_path =  "sites/files/$imgname";
                                 print 'yyy'.     $file_drupal_path;
                                
                                  $file = new stdClass();
                                  $file->filename = basename($file_drupal_path);
                                  $file->filepath = $file_drupal_path;
                                  $file->filemime = $mime;
                                  $file->filesize = filesize($file_drupal_path);

                                  $file->uid = $user->uid;
                                  $file->status = FILE_STATUS_PERMANENT;
                                  $file->timestamp = time();
                                  drupal_write_record('files', $file);
                                  $file->fid = db_result(db_query("SELECT fid FROM {blogapi_files} WHERE filepath = '%s'", $file->filepath));
                                   
                                   
                                    $nid = $node->nid; // your NID here
                                   
                                  $node->field_img = array(
                                    array(
                                      'fid' => $file->fid,
                                      'title' => basename($file->filename),
                                      'filename' => $file->filename,
                                      'filepath' => $file->filepath,
                                      'filesize' => $file->filesize,
                                      'mimetype' => $mime,
                                      'description' => basename($file->filename),
                                      'list' => 1,
                                    ),