Implementing native methods

To implement native methods:

1. Generate default (template) implementation classes using the -native compiler option. This generates C++ header and source files with a “NativeMethods” suffix. For example, if you compile A.B.MyClass, the generated source file is A_B_MyClassNativeMethods.cpp.

2. Edit the generated source file, in this case A_B_MyClassNativeMethods.cpp, and add the code to implement the methods.

3. Compile your source files into a DLL or shared library. On Windows, the easiest way to do this is to use the -dll option on the jnicc command line. On other systems, invoke your compiler separately afterward.

4. Load the DLL or shared library from your Java class with a static initializer by calling com.sybase.jni.SystemUtil.loadLibrary, as in the following example. Native methods are registered automatically.

   public class MyClass
   {
      static
      {
         com.sybase.jni.SystemUtil.loadLibrary("MyClass");
      }
   
      public native void myMethod();
   }
   

5. To register native methods statically in C++ code, use the following syntax:

   A_B_MyClassNativeMethods::__register();
   

You can find a sample implementation in the EAServer samples/SimpleRowSet directory.