napi_get_cb_info

napi_status napi_get_cb_info(napi_env env,
                             napi_callback_info cbinfo,
                             size_t* argc,
                             napi_value* argv,
                             napi_value* thisArg,
                             void** data) 拷贝

• [in] env：调用 API 的环境。

  ¥[in] env: The environment that the API is invoked under.

• [in] cbinfo：传递给回调函数的回调信息。

  ¥[in] cbinfo: The callback info passed into the callback function.

• [in-out] argc：指定所提供的 argv 数组的长度并接收参数的实际计数。argc 可以选择性地通过传递 NULL 来忽略。

  ¥[in-out] argc: Specifies the length of the provided argv array and receives the actual count of arguments. argc can optionally be ignored by passing NULL.

• [out] argv：参数将被复制到的 napi_value 的 C 数组。如果参数数量多于提供的数量，则只复制请求数量的参数。如果提供的参数比声明的少，则 argv 的其余部分将填充代表 undefined 的 napi_value 值。argv 可以选择性地通过传递 NULL 来忽略。

  ¥[out] argv: C array of napi_values to which the arguments will be copied. If there are more arguments than the provided count, only the requested number of arguments are copied. If there are fewer arguments provided than claimed, the rest of argv is filled with napi_value values that represent undefined. argv can optionally be ignored by passing NULL.

• [out] thisArg：接收调用的 JavaScript this 参数。thisArg 可以选择性地通过传递 NULL 来忽略。

  ¥[out] thisArg: Receives the JavaScript this argument for the call. thisArg can optionally be ignored by passing NULL.

• [out] data：接收回调的数据指针。data 可以选择性地通过传递 NULL 来忽略。

  ¥[out] data: Receives the data pointer for the callback. data can optionally be ignored by passing NULL.

如果 API 成功，则返回 napi_ok。

¥Returns napi_ok if the API succeeded.

此方法在回调函数中用于检索有关调用的详细信息，例如来自给定回调信息的参数和 this 指针。

¥This method is used within a callback function to retrieve details about the call like the arguments and the this pointer from a given callback info.