SherbyNet - /page/wikibook/entry.mu

part 6/7 · 11.9 KB total

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The program below loads the Kernel32.dll and uses it to call the Beep and Sleep functions.

Note: The following code works only on Windows platforms.

import com.sun.jna.Library;

import com.sun.jna.Native;

/** Simple example of Windows native library declaration and usage. */

public class BeepExample {

public interface Kernel32 extends Library {

// FREQUENCY is expressed in hertz and ranges from 37 to 32767

// DURATION is expressed in milliseconds

public boolean Beep(int FREQUENCY, int DURATION);

public void Sleep(int DURATION);

}

public static void main(String[] args) {

Kernel32 lib = (Kernel32) Native.loadLibrary("kernel32", Kernel32.class);

lib.Beep(698, 500);

lib.Sleep(500);

lib.Beep(698, 500);

}

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