SWIG在Java中将c ++字符串包装为byte []

Question

swig.i

%typemap(jtype) bool foo "byte[]"
%typemap(jstype) bool foo "byte[]"
%typemap(jni) bool foo "jbyteArray"
%typemap(javaout) bool foo { return $jnicall; }
%typemap(in, numinputs=0) std::string& out (std::string temp) "$1=&temp;"
%typemap(argout) std::string& out {
  $result = JCALL1(NewByteArray, jenv, $1->size());
  JCALL4(SetByteArrayRegion, jenv, $result, 0, $1->size(), (const jbyte*)$1->c_str());
}
// Optional: return NULL if the function returned false
%typemap(out) bool foo ""

%inline %{
struct Bar {
  bool foo(std::string& out) {
    std::string s;
    s.push_back('H');
    s.push_back('o');
    s.push_back(0);
    s.push_back('l');
    s.push_back('a');
    out = s;
    return true;
  }
};
%}

Java

public byte[] foo() { return NativeISecurityProviderJNI.Bar_foo(swigCPtr, this); }

Till here everything fine, but what I am trying to get is this java return (byte[]) as an argument. like

public void foo(byte[] example) {}

I've tried a lot of possible modifications in order to get that, but there is no way and I've ran out of imagination. I would appreciate whatever suggestion. Thanks you very much.

Answer 1

The technique at Correct way to interact with arrays using SWIG likely applies. The technique is documented at 24.8.5 Binary data vs Strings .