Page 160 - The Definitive Guide to Building Java Robots

Preston_5564C05.fm Page 141 Tuesday, September 20, 2005 5:13 AM

CHAPTER 5 ■ SPEECH 141

// sample program
public static void main(String args[]) {
TempConvert tc = new TempConvert();
for (int c = 0; c < 101; c++) {
System.out.println("c=" + c + ",f=" + tc.CtoF(c));
}
}
}
4. Run javah on the compiled .class file. Javah produces C and C++ header files from your
native Java class.
javah – jni TempConvert

■Note From your IDE, you can either go to the compiled class path (for example, /bin/com/scottpreston/
javarobot/chapter5) or you can specify the class name from path root or a compiled JAR file.

The output of the file is shown in Example 5-2.

Example 5-2. TempConvert.h
/* DO NOT EDIT THIS FILE - it is machine generated */
#include "jni.h"
/* Header for class TempConvert */

#ifndef _Included_TempConvert
#define _Included_TempConvert
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: TempConvert
* Method: CtoF
* Signature: (F)F
*/
JNIEXPORT jfloat JNICALL Java_com_scottpreston_javarobot_➥
chapter5_TempConvert_CtoF
(JNIEnv *, jobject, jfloat);