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I am trying to call a native C function from Dart. I have made my C files, CMakeLists.txt and required Dart file. but when I run my code it shows:

Execution failed for task ':flutter_plugin3:generateJsonModelDebug'.
> C:\Users\Mubin\AndroidStudioProjects\flutter_plugin3\android\CMakeLists.txt : C/C++ debug|armeabi-v7a : CMake Error at C:\Users\Mubin\AndroidStudioProjects\flutter_plugin3\android\CMakeLists.txt:3 (add_library):
    Cannot find source file:


    Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
    .hxx .in .txx

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

re.png - Google Drive[^]

What I have tried:

My CMakeLists:

cmake_minimum_required(VERSION 3.7 FATAL_ERROR)
project(hello_library VERSION 1.0.0 LANGUAGES C)
add_library(hello_library SHARED hello.c hello.def)
add_executable(hello_test hello.c)

set_target_properties(hello_library PROPERTIES
    PUBLIC_HEADER hello.h
    OUTPUT_NAME "hello"

Dart code:

import 'dart:ffi' as ffi;
import 'dart:io' show Platform, Directory;
import 'package:path/path.dart' as path;
// For Platform.isX
import 'dart:async';

import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';

class FlutterPlugin3 {
  static const MethodChannel _channel =
      const MethodChannel('flutter_plugin3');

  static Future<String> get platformVersion async {
    final String version = await _channel.invokeMethod('getPlatformVersion');
    return version;

  // Open the dynamic library
typedef hello_world_func = ffi.Void Function();
// Dart type definition for calling the C foreign function
typedef HelloWorld = void Function();

 greet() {
   // Open the dynamic library
   var libraryPath = path.join(Directory.current.path, 'hello_library',
   if (Platform.isMacOS) {
     libraryPath = path.join(Directory.current.path, 'hello_library',
   } else if (Platform.isWindows) {
     libraryPath = path.join(Directory.current.path, 'hello_library',
         'Debug', 'hello.dll');

   final dylib =;

   // Look up the C function 'hello_world'
   final HelloWorld hello = dylib

   // Call the function
Updated 8-May-21 4:15am
Richard MacCutchan 8-May-21 9:38am    
The message is quite clear as to which file it cannot find.
Md. Mubin 8-May-21 10:07am    
the file which containing the C code and the desired function.

here's the link of the image:

I have also edited it in my question.
Richard MacCutchan 8-May-21 10:34am    
That does not alter the fact that the process cannot find it. I do not know flutter so I cannot suggest anything. Check the settings and rules for your make file.

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