C++ (Cpp) napi_get_value_string_utf8示例

示例#1

文件： test_string.c 项目： bammons/node

napi_value TestUtf8(napi_env env, napi_callback_info info) {
  size_t argc = 1;
  napi_value args[1];
  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));

  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");

  napi_valuetype valuetype;
  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));

  NAPI_ASSERT(env, valuetype == napi_string,
    "Wrong type of argment. Expects a string.");

  char buffer[128];
  size_t buffer_size = 128;
  size_t copied;

  NAPI_CALL(env,
    napi_get_value_string_utf8(env, args[0], buffer, buffer_size, &copied));

  napi_value output;
  NAPI_CALL(env, napi_create_string_utf8(env, buffer, copied, &output));

  return output;
}

示例#2

文件： test_properties.c 项目： Frrank1/node

napi_value HasNamedProperty(napi_env env, napi_callback_info info) {
  size_t argc = 2;
  napi_value args[2];
  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));

  NAPI_ASSERT(env, argc == 2, "Wrong number of arguments");

  // Extract the name of the property to check
  char buffer[128];
  size_t copied;
  NAPI_CALL(env,
      napi_get_value_string_utf8(env, args[1], buffer, sizeof(buffer), &copied));

  // do the check and create the boolean return value
  bool value;
  napi_value result;
  NAPI_CALL(env, napi_has_named_property(env, args[0], buffer, &value));
  NAPI_CALL(env, napi_get_boolean(env, value, &result));

  return result;
}

示例#3

文件： test_string.c 项目： bammons/node

napi_value Utf8Length(napi_env env, napi_callback_info info) {
  size_t argc = 1;
  napi_value args[1];
  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));

  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");

  napi_valuetype valuetype;
  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));

  NAPI_ASSERT(env, valuetype == napi_string,
    "Wrong type of argment. Expects a string.");

  size_t length;
  NAPI_CALL(env, napi_get_value_string_utf8(env, args[0], NULL, 0, &length));

  napi_value output;
  NAPI_CALL(env, napi_create_number(env, (double)length, &output));

  return output;
}