getValue method

String? getValue(String name)

Implementation

String? getValue(String name) {
  final langCodepages = [
    // try the language and codepage from the EXE
    [_data.lpLang!.ref.wLanguage, _data.lpLang!.ref.wCodePage],
    // try the default language and codepage from the EXE
    [_GetUserDefaultLangID(), _data.lpLang!.ref.wCodePage],
    // try the language from the EXE and Latin codepage (most common)
    [_data.lpLang!.ref.wLanguage, 1252],
    // try the default language and Latin codepage (most common)
    [_GetUserDefaultLangID(), 1252],
  ];

  String? value;
  final Pointer<IntPtr>? lplpBuffer = calloc<IntPtr>();
  final Pointer<Uint32>? puLen = calloc<Uint32>();

  String toHex4(int val) => val.toRadixString(16).padLeft(4, '0');

  for (final langCodepage in langCodepages) {
    final lang = toHex4(langCodepage[0]!);
    final codepage = toHex4(langCodepage[1]!);
    final lpSubBlock = TEXT('\\StringFileInfo\\$lang$codepage\\$name');
    final res =
        VerQueryValue(_data.lpBlock!, lpSubBlock, lplpBuffer!.cast(), puLen!);
    calloc.free(lpSubBlock);

    if (res != 0 && lplpBuffer.value != 0 && puLen.value > 0) {
      final ptr = Pointer<Utf16>.fromAddress(lplpBuffer.value);
      value = ptr.toDartString();
      break;
    }
  }

  calloc.free(lplpBuffer!);
  calloc.free(puLen!);
  return value;
}