Calling Java from C (JNI)

[Matt Senecal]

I have a java class that contains a method I need to make accessable to C functions. It looks something like this:

public class ExportName
{
   private SomeObj theObj;
   public ExportName(SomeObj theObj)
   {
      this.theObj = theObj;
   } //end ExportName
   
   public String getName() 
   { 
      return theObj.getName(); 
   }
   public native String getNameJNI();

Using javah I have my ExportName.h, and I'm in the process of writing ExportName.c:

#include <stdio.h>
#include <jni.h>
#include "ExportName.h"
JNIEXPORT jstring JNICALL Java_ExportName_getNameJNI (JNIEnv *, jobject)
{
   jclass cls = (*env)->GetObjectClass(env, obj);
   jMethodID mid = (*env)->GetMethodID(env, cls, "getName", "()Ljava/lang/String");
   if (mid == 0)
   {
      return;
   } /* end if */
}

I have 2 questions:
(1)At some point, I need to actually call the java method using

(*env)->Call<TYPE>Method(env, obj, mid);

What type should I use here (CallWhatMethod)?
(2)Also, I need to create genuine C wrappers for these methods. How do I hand off the jstring returned by this JNI C code to the ANSI C method that calls it? I know that there is a conversion along the lines of:

const char *str = (*env)->GetStringUTFChars(env, <<JSTRING HERE>>, 0);

Can I just put the call to the JNI code where the jstring variable name goes?
Any help would be appreciated. I have already read the Java tutorial on JNI, so please don't respond just to tell me to go there.
Thanks!
[ May 13, 2002: Message edited by: Matt Senecal ]