text: // Copyright (c) 2011 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 "base/scoped_native_library.h"
  
  #include "build/build_config.h"
  #include "gtest/gtest.h"
  
  #if defined(OS_WIN)
  #include "base/files/file_path.h"
  #include "base/strings/utf_string_conversions.h"
  #endif
  
  namespace base {
  
  // Tests whether or not a function pointer retrieved via ScopedNativeLibrary
  // is available only in a scope.
  TEST(ScopedNativeLibrary, Basic) {
  #if defined(OS_WIN)
    // Get the pointer to DirectDrawCreate() from "ddraw.dll" and verify it
    // is valid only in this scope.
    // FreeLibrary() doesn't actually unload a DLL until its reference count
    // becomes zero, i.e. function pointer is still valid if the DLL used
    // in this test is also used by another part of this executable.
    // So, this test uses "ddraw.dll", which is not used by Chrome at all but
    // installed on all versions of Windows.
    const char kFunctionName[] = "DirectDrawCreate";
    NativeLibrary native_library;
    {
      FilePath path(FilePath::FromUTF8Unsafe(GetNativeLibraryName("ddraw")));
      native_library = LoadNativeLibrary(path, nullptr);
      ScopedNativeLibrary library(native_library);
      EXPECT_TRUE(library.is_valid());
      EXPECT_EQ(native_library, library.get());
      FARPROC test_function =
          reinterpret_cast<FARPROC>(library.GetFunctionPointer(kFunctionName));
      EXPECT_EQ(0, IsBadCodePtr(test_function));
      EXPECT_EQ(
          GetFunctionPointerFromNativeLibrary(native_library, kFunctionName),
          test_function);
    }
    EXPECT_FALSE(
        GetFunctionPointerFromNativeLibrary(native_library, kFunctionName));
  #endif
  }
  
  }  // namespace base
  