Use JS_ExpandKeywordParams() in app.response()

samples/pdfium_test.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <list>
@@ skipping 177 matching lines @@
   // If a PS_NULL pen is used, the dimensions of the rectangle are 1 pixel less.
   Rectangle(dc, 0, 0, width + 1, height + 1);
 
   FPDF_RenderPage(dc, page, 0, 0, width, height, 0,
                   FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
 
   DeleteEnhMetaFile(CloseEnhMetaFile(dc));
 }
 #endif
 
+// These example JS platform callback handlers are entirely optional,
+// and exist here to show the flow of information from a document back
+// to the embedder.
 int ExampleAppAlert(IPDF_JSPLATFORM*,
                     FPDF_WIDESTRING msg,
                     FPDF_WIDESTRING title,
                     int nType,
                     int nIcon) {
   printf("%ls", GetPlatformWString(title).c_str());
   if (nIcon || nType)
     printf("[icon=%d,type=%d]", nIcon, nType);
   printf(": %ls\n", GetPlatformWString(msg).c_str());
   return 0;
 }
 
+int ExampleAppResponse(IPDF_JSPLATFORM*,
+                       FPDF_WIDESTRING question,
+                       FPDF_WIDESTRING title,
+                       FPDF_WIDESTRING defaultValue,
+                       FPDF_WIDESTRING label,
+                       FPDF_BOOL isPassword,
+                       void* response,
+                       int length) {
+  printf("%ls: %ls, defaultValue=%ls, label=%ls, isPassword=%d, length=%d\n",
+         GetPlatformWString(title).c_str(),
+         GetPlatformWString(question).c_str(),
+         GetPlatformWString(defaultValue).c_str(),
+         GetPlatformWString(label).c_str(), isPassword, length);
+
+  // UTF-16, always LE regardless of platform.
+  uint8_t* ptr = static_cast<uint8_t*>(response);
+  ptr[0] = 'N';
+  ptr[1] = 0;
+  ptr[2] = 'o';
+  ptr[3] = 0;
+  return 4;
+}
+
 void ExampleDocGotoPage(IPDF_JSPLATFORM*, int pageNumber) {
   printf("Goto Page: %d\n", pageNumber);
 }
 
 void ExampleDocMail(IPDF_JSPLATFORM*,
                     void* mailData,
                     int length,
                     FPDF_BOOL bUI,
                     FPDF_WIDESTRING To,
                     FPDF_WIDESTRING Subject,
@@ skipping 198 matching lines @@
 }
 
 void RenderPdf(const std::string& name, const char* pBuf, size_t len,
                const Options& options) {
   fprintf(stderr, "Rendering PDF file %s.\n", name.c_str());
 
   IPDF_JSPLATFORM platform_callbacks;
   memset(&platform_callbacks, '\0', sizeof(platform_callbacks));
   platform_callbacks.version = 3;
   platform_callbacks.app_alert = ExampleAppAlert;
+  platform_callbacks.app_response = ExampleAppResponse;
   platform_callbacks.Doc_gotoPage = ExampleDocGotoPage;
   platform_callbacks.Doc_mail = ExampleDocMail;
 
   FPDF_FORMFILLINFO form_callbacks;
   memset(&form_callbacks, '\0', sizeof(form_callbacks));
   form_callbacks.version = 1;
   form_callbacks.m_pJsPlatform = &platform_callbacks;
 
   TestLoader loader(pBuf, len);
   FPDF_FILEACCESS file_access;
@@ skipping 208 matching lines @@
   }
 
   FPDF_DestroyLibrary();
 #ifdef PDF_ENABLE_V8
   v8::V8::ShutdownPlatform();
   delete platform;
 #endif  // PDF_ENABLE_V8
 
   return 0;
 }