Add type cast definitions for CPDF_String.

core/src/fpdfdoc/doc_ap.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../include/fpdfdoc/fpdf_ap.h"
 #include "../../include/fpdfdoc/fpdf_doc.h"
 #include "../../include/fpdfdoc/fpdf_vt.h"
 #include "doc_utils.h"
@@ skipping 600 matching lines @@
                          : 0;
       CFX_ByteTextBuf sBody;
       if (pOpts) {
         FX_FLOAT fy = rcBody.top;
         for (int32_t i = nTop, sz = pOpts->GetCount(); i < sz; i++) {
           if (IsFloatSmaller(fy, rcBody.bottom)) {
             break;
           }
           if (CPDF_Object* pOpt = pOpts->GetElementValue(i)) {
             CFX_WideString swItem;
-            if (pOpt->GetType() == PDFOBJ_STRING) {
+            if (pOpt->IsString()) {
               swItem = pOpt->GetUnicodeText();
             } else if (pOpt->GetType() == PDFOBJ_ARRAY) {
               swItem =
                   ((CPDF_Array*)pOpt)->GetElementValue(1)->GetUnicodeText();
             }
             FX_BOOL bSelected = FALSE;
             if (pSels) {
               for (FX_DWORD s = 0, ssz = pSels->GetCount(); s < ssz; s++) {
                 if (i == pSels->GetInteger(s)) {
                   bSelected = TRUE;
@@ skipping 298 matching lines @@
                    << "\n";
       break;
     case CT_CMYK:
       sColorStream << color.fColor1 << " " << color.fColor2 << " "
                    << color.fColor3 << " " << color.fColor4 << " "
                    << (bFillOrStroke ? "k" : "K") << "\n";
       break;
   }
   return sColorStream.GetByteString();
 }