xml file is now a argument for the lib

Cargo.lock

@@ -2416,6 +2416,7 @@ name = "visual_haarcascades"
 version = "0.1.0"
 dependencies = [
  "image 0.23.4",
+ "libc",
  "log",
  "nannou",
  "ndarray",

Cargo.toml

@@ -32,3 +32,4 @@ simplelog = "0.8.0"
 roxmltree = "0.13.0"
 ndarray = "0.13"
 stopwatch = "0.0.7"
+libc = "*"

src/lib.rs

@@ -7,6 +7,9 @@ mod heatmap;
 use std::slice;
 use image;
 
+use std::{ffi::CStr};
+use libc::c_char;
+
 static mut IMAGENR: i32 = 0;
 
 #[no_mangle]
@@ -17,9 +20,18 @@ pub extern "C" fn test(x: i32) -> i32 {
 
 /// partly inspired by https://bheisler.github.io/post/calling-rust-in-python/
 #[no_mangle]
-pub extern "C" fn classifier_new()
+pub extern "C" fn classifier_new(s: *const  c_char)
                             -> *mut visualhaar::HaarClassifier {
-    let haar = visualhaar::HaarClassifier::from_xml("/home/ruben/Documents/Projecten/2020/rust/testproject/haarcascade_frontalface_alt2.xml").unwrap();
+    let c_str = unsafe {
+        assert!(!s.is_null());
+
+        CStr::from_ptr(s)
+    };
+
+    let filename = c_str.to_str().unwrap();
+
+    println!("Using cascade file: {}", filename);
+    let haar = visualhaar::HaarClassifier::from_xml(filename).unwrap();
     let boxed_haar = Box::new(haar);
     Box::into_raw(boxed_haar)
 }