io.humble.ferry

Class JNIPointerReference

java.lang.Object

io.humble.ferry.JNIPointerReference

Direct Known Subclasses:

FfmpegIOHandle

public class JNIPointerReference
extends Object

Internal Only. An Opaque handle that holds a Native mPointer/handle. This class holds a opaque long value that can be used to pass into JNI C function that expect a ** in C.

For example, a function like this in native code:

   int url_open(URLContext **handlePtr, char *name, int flags);
   int url_read(URLContext *handle, void* buf, int len);
 

might map to the following Java method:

 public class Example {
   public native int url_open(JNIPointerReference p, String name, int flags);
   public native int url_read(JNIPointerReference p, byte[] buf, int len);
   public void example() {
      int retval = 0;
      JNIPointerReference p;
      // p.setPointer is called by the native function 
      retval = url_open(p, "foo", 0);
      
      // p.getPointer is called by the native function
      byte[] buf = new bytes[1024];
      retval = url_read(p, buf, buf.length);
   }
 

IMPORTANT: DO NOT RENAME THIS CLASS OR METHODS IN IT. NATIVE CODE DEPENDS ON THE NAMES AND SIGNATURES.

Constructor Summary

Constructors

Constructor and Description
JNIPointerReference() Internal Only.

Method Summary

Modifier and Type	Method and Description
String	toString() Internal Only.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

JNIPointerReference

public JNIPointerReference()

Internal Only.

Method Detail

toString

public String toString()

Internal Only.

Overrides:

toString in class Object