How can I use a C library from node js

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How can I use a C   library from node js

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Try shelljs to call c c   program or shared libraries by using node program from linux unix   node-cmd an option in windows  Both packages basically enable us to call c c   program similar to the way we call from terminal command line  Eg in ubuntu  const shell   require  shelljs     shell exec  quot command or script name quot     In windows  const cmd   require  node-cmd    cmd run  command here     Note  shelljs and node-cmd are for running os commands  not specific to c c

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There newer ways to connect Node js and C    Please  loot at Nan   EDIT The fastest and easiest way is nbind  If you want to write asynchronous add-on you can combine Asyncworker class from nan

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There is a fresh answer to that question now  SWIG  as of version 3 0 seems to provide javascript interface generators for Node js  Webkit and v8   I ve been using SWIG extensively for Java and Python for a while  and once you understand how SWIG works  there is almost no effort compared to ffi or the equivalent in the target language  needed for interfacing C   code to the languages that SWIG supports   As a small example  say you have a library with the header myclass h    include lt iostream gt   class MyClass           int myNumber  public          MyClass int number   myNumber number            void sayHello                     std  cout  lt  lt   Hello  my number is                     lt  lt  myNumber  lt  lt std  endl                 In order to use this class in node  you simply write the following SWIG interface file  mylib i     module  mylib      include  myclass h      include  myclass h    Create the binding file binding gyp        targets                  target name    mylib          sources      mylib wrap cxx                  Run the following commands   swig -c   -javascript -node mylib i node-gyp build   Now  running node from the same folder  you can do    gt  var mylib   require    build Release mylib    gt  var c   new mylib MyClass 5   gt  c sayHello   Hello  my number is 5   Even though we needed to write 2 interface files for such a small example  note how we didn t have to mention the MyClass constructor nor the sayHello method anywhere  SWIG discovers these things  and automatically generates natural interfaces

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Becareful with swig and C    http   www swig org Doc1 3 SWIG html SWIG nn8     Running SWIG on C   source files  what would appear in a  C or  cxx file  is not recommended  Even though SWIG can parse C   class declarations  it ignores declarations that are decoupled from their original class definition  the declarations are parsed  but a lot of warning messages may be generated   For example      Not supported by SWIG    int foo  bar int            whatever          It s rarely to have a C   class limited to only one  h file   Also  the versions of swig supporting JavaScript is swig-3 0 1 or later

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Here is an interesting article on Getting your C   to the Web with Node js     three general ways of integrating C   code with a Node js application   - although there are lots of variations within each category          Automation - call your C   as a standalone app in a child process    Shared library - pack your C   routines in a shared library  dll  and call those routines from Node js directly    Node js Addon - compile your C   code as a native Node js module addon

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You can use a node js extension to provide bindings for your C   code  Here is one tutorial that covers that    http   syskall com how-to-write-your-own-native-nodejs-extension

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Look at node-ffi      node-ffi is a Node js addon for loading and calling dynamic libraries using pure JavaScript  It can be used to create bindings to native libraries without writing any C   code

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You could use emscripten to compile C   code into js

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