Where is jni.h

Question

Hi
I was doing a tutorial by Beth Stearns at: http://java.sun.com/docs/books/tutorial/native1.1/index.html
I compiled my java file using javah -jni HelloWorld. which works fine. then i wrote the C file with the following code:
#include <jni.h>
#include "HelloWorld.h"
#include <stdio.h>
JNIEXPORT void JNICALL
Java_HelloWorld_displayHelloWorld(JNIEnv *env, jobject obj)
printf("Hello world!\n");
return;
However when i compile this file i get the error that it cannot find the 'jni.h' and 'HelloWorld.h' files.
when i looked under the directory i can find the 'HelloWorld.h' file but i cannot find the 'jni.h' file.
so really i have 2 questions:
why cannot the compiler find the HelloWorld.h file
and where is jni.h located.
regards
Qasim

Answer 1

Create the HelloWorld.h :
1st. Write OK in HelloWorld.java then compiler to class.
2nd. use "javah - jni HelloWorld"
All the flow way is listed below:
1st. write HelloWorld.java
2nd. compiler HelloWorld.java to create HelloWorld.class
3rd. command: javah - jni HelloWorld to make HelloWorld.h
4th. write your C file
5th. Be sure to include "jni.h","HelloWorld.h"
6th. use VC++ ( or others.) to make out DLL file.
the 6th way like this:
C:\Program Files\Visual Studio\vc\bin\cl.exe -Ic:\jdk\include -I c:\jdk\include\win32 -LD HelloWorld -FeHelloWorld.dll