TextOrientation オブジェクト（ITextOrientation インターフェイス）

FREngine.IFRDocument frdoc;
// 各ページの向きを取得
int pagesCount = frDoc.Pages.Count;
FREngine.RotationTypeEnum[] rotations = new FREngine.RotationTypeEnum[pagesCount];
for (int i = 0; i < pagesCount; i++)
{
 FREngine.IFRPage page = frDoc.Pages[i];
 FREngine.ITextOrientation ori = page.DetectOrientation(null, ppp.ObjectsExtractionParams, ppp.RecognizerParams);
 rotations[i] = FREngine.RotationTypeEnum.RT_UnknownRotation;
 if( ori != null ) {
  rotations[i] = ori.RotationType;
 }
}