By directly using Node.js, I am able to retrieve the correct native memory address as shown in the example below:
// For example, with a native DLL written in Rust. This portion can also be implemented in C or C++.
#[no_mangle]
pub unsafe extern fn example_concat(
a: *const c_char,
b: *const c_char
) -> *mut c_char
{
let sa = CStr::from_ptr(a).to_str().expect("cannot convert a to str");
let sb = CStr::from_ptr(b).to_str().expect("cannot convert b to str");
let sr = format!("{}{}", sa, sb);
let cr = CString::new(sr).expect("cannot create cr from sr");
println!("[from native lib] cr={} *=0x{:X}", cr.to_str().expect("cannot convert cr to str"), cr.as_ptr() as c_ulonglong);
cr.into_raw()
}
// tester.js
// Example using ffi and ref module in Node.js
const ffi = require('ffi-napi');
const ref = require('ref-napi');
const str = ref.types.CString;
const lib = ffi.Library( 'lib.dll', { 'example_concat': [ "char *", [ str, str ] ] } );
const buffer = lib.example_concat( "su", "shi" );
console.log( '[from tester.js]', buffer.hexAddress(), buffer.readCString() );
The output of running node tester.js would be something like this:
[from native lib] cr=sushi *=0x1E7B3B3E8C0
[from tester.js] 000001E7B3B3E8C0 sushi
However, when attempting a similar FFI approach with the react-electron system, issues arise.
// App.js within a React-Electron Node.js project
const remote = window.require('electron').remote;
const ffi = remote.require( 'ffi-napi' );
const ref = remote.require( 'ref-napi' );
const str = ref.types.CString;
const lib = ffi.Library( 'lib.dll', { 'example_concat': [ "char *", [ str, str ] ] } );
const buffer = lib.example_concat( "su", "shi" );
console.log( '[from App.js(electron)]', ref.hexAddress( buffer ), ref.readCString( buffer ) ); // <-- The memory address returned is incorrect!!
The result obtained from the electron version displays:
[from native lib] cr=sushi *=0x2BFA2F07A10
[from App.js(electron)] 000002BFA3BA7230 sushi
Any suggestions on how to obtain the accurate native memory address within an electron project?
- Operating System: Microsoft Windows 10 (64-Bit) Version 10.0.19041.153
- Node Version: 13.5.0
- Node-ffi-napi Version: 2.4.7
- Node-ffi-ref Version: 1.4.3
- React Version: 16.13.0
- Electron Version: 8.1.1