Crate typed_jni_core 

Basic JNI Bindings for Rust

This crate provides basic JNI bindings for Rust.

Example

use typed_jni_core::{Arg, FieldID, JNIEnv, LocalRef, MethodID};

pub fn run_jni(env: &JNIEnv) {
    unsafe {
        let c_system = env.find_class(c"java/lang/System").unwrap();

        let f_out: FieldID<true> = env.get_field_id(&c_system, c"out", c"Ljava/io/PrintStream;").unwrap();
        let o_out: Option<LocalRef> = env.get_object_field(&c_system, f_out).unwrap();

        let c_print_stream = env.get_object_class(o_out.as_ref().unwrap());
        let m_println: MethodID<false> = env
            .get_method_id(&c_print_stream, c"println", c"(Ljava/lang/String;)V")
            .unwrap();

        let s_hello = env.new_string("Hello, World!");
        env.call_void_method(o_out.as_ref().unwrap(), m_println, [Arg::from(&s_hello)])
            .unwrap();
    }
}

Features

• alloc: Enables the use of alloc crate for dynamic memory allocation. (default)
• print-throwable: Enables the printing of throwable objects.

Modules

sys

Structs

ArrayElementsGuard

Guard of an array elements.

AttachError

FieldID

Represents a field ID.

GlobalRef

GlobalRef is a global reference to a Java object.

JNIEnv

A wrapper of raw JNI environment pointer.

JavaVM

JavaVM is a handle to the Java VM.

LocalRef

LocalRef is a local reference to a Java object.

MethodID

Represents a method ID.

ModifiedUTF8StrGuard

A guard that releases the modified UTF-8 string when dropped.

NativeFunction

TrampolineRef

TrampolineRef is a local reference to a Java object but only usable for native function implementation.

WeakGlobalRef

GlobalWeakRef is a weak global reference to a Java object.

Enums

Arg

Argument for a method call.

Traits

Ref

A reference to a Java object.

StrongRef

A strong reference to a Java object.

WeakRef

A weak reference to a Java object.

Type Aliases

AttachHook