Make CPDF_Object::GetString() a virtual method.

fpdfsdk/src/fpdfdoc.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/fsdk_define.h"
 #include "../../public/fpdf_doc.h"
 
 static int THISMODULE = 0;
@@ skipping 201 matching lines @@
         CPDF_Page* pPage = (CPDF_Page*)page;
         if(!pPage->m_pFormDict)
                 return FALSE;
         CPDF_Array* pAnnots = pPage->m_pFormDict->GetArray("Annots");
         if(!pAnnots)
                 return FALSE;
         for (int i = *startPos; i < (int)pAnnots->GetCount(); i++) {
                 CPDF_Dictionary* pDict = (CPDF_Dictionary*)pAnnots->GetElementValue(i);
                 if (!pDict || pDict->GetType() != PDFOBJ_DICTIONARY)
                         continue;
-                if(pDict->GetString(FX_BSTRC("Subtype")).Equal(FX_BSTRC("Link"))) {
+                if(pDict->GetStringAt("Subtype").Equal(FX_BSTRC("Link"))) {
                         *startPos = i + 1;
                         *linkAnnot = (FPDF_LINK)pDict;
                         return TRUE;
                 }
         }
         return FALSE;
 }
 
 DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetAnnotRect(FPDF_LINK linkAnnot, FS_RECTF* rect)
 {
@@ skipping 54 matching lines @@
                 return 0;
         CFX_WideString text = pInfo->GetUnicodeText(tag);
         // Use UTF-16LE encoding
         CFX_ByteString encodedText = text.UTF16LE_Encode();
         unsigned long len = encodedText.GetLength();
         if (buffer && buflen >= len) {
                 FXSYS_memcpy(buffer, encodedText.c_str(), len);
         }
         return len;
 }