How to call a C function from a react-native code?

Question

I have developed a small android application using react-native. For what it was developed, it works fine. Now to accommodate a small requirement, we need to call a library written in C. I am not sure if there will be a way to call the C code from JavaScript! But I still wanted to ask you all.

Is there a way to do this from react-native? Like I want to call some functions in the C library. If this possible, could you please suggest how? How could I start to test a very basic setup?

Bruno Mazzardo · Accepted Answer · 2018-05-21 16:26:52Z

0

You are going to have to write some native code, search for how to call a C lib on Android, then look for react native way to link a native code with a js call.

Native Module link https://facebook.github.io/react-native/docs/native-modules-android.html

StackOverflow question on how to run c/cpp code on android how to use c/cpp library/functions in android

answered May 21, 2018 at 16:26

Bruno Mazzardo

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12 Comments

Miller Over a year ago

I am a little confused. What is the first link that you gave? It shows some Java code? Is this relevant?

Bruno Mazzardo Over a year ago

React native lets you write your own native code, and then call it on your js file. You are going to have to write Java to call the C library, and create a native module based on that java, and use the first link to integrate with your js file.

Bruno Mazzardo Over a year ago

This is more advanced react native code, you first gonna need to understand how React Native works, and its code flow

Miller Over a year ago

So you mean, react-native communicates with Java which communicates with C?

Bruno Mazzardo Over a year ago

yeah, behind every js component you call, there is already a java code, react let's write you write your own native code if they don't have already implemented.

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RY_ Zheng · Accepted Answer · 2021-02-03 04:42:07Z

0

Basically it includes 3 parts.

JavaScript to Java or Kotlin

check out React Native's guide to Android Native Module.

Java or Kotlin to C

Calling C functions from Java is enabled with a mechanism called Java Native Interface (JNI) . check out how to add C and C++ code here.

see more here https://thebhwgroup.com/blog/react-native-jni

answered Feb 3, 2021 at 4:42

RY_ Zheng

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