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      <DIV align=center><B><FONT  size=3>Java如何调用C/C++(JNI) 
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      color=#333300>Java如何调用C/C++(JNI)<BR><BR><BR>Java开发者&nbsp;jdeveloper&nbsp;<BR>1.&nbsp;program&nbsp;Java&nbsp;source&nbsp;file&nbsp;loading&nbsp;Native&nbsp;method&nbsp;<BR>//&nbsp;<BR>//&nbsp;<BR>//&nbsp;NativeDemo&nbsp;<BR>//&nbsp;Author:&nbsp;huang_jc&nbsp;1999/05/20&nbsp;<BR>//&nbsp;file&nbsp;name:&nbsp;NativeDemo.java&nbsp;<BR>public&nbsp;class&nbsp;NativeDemo&nbsp;<BR>{&nbsp;<BR>int&nbsp;i;&nbsp;<BR>int&nbsp;j;&nbsp;<BR>public&nbsp;static&nbsp;void&nbsp;main(String&nbsp;args[])&nbsp;<BR>{&nbsp;<BR>NativeDemo&nbsp;ob&nbsp;=&nbsp;new&nbsp;NativeDemo();&nbsp;<BR>ob.i&nbsp;=&nbsp;10;&nbsp;<BR>ob.j&nbsp;=&nbsp;ob.test();&nbsp;<BR>System.out.println("this&nbsp;is&nbsp;ob.i:"+ob.i+"\n");&nbsp;<BR>System.out.println("this&nbsp;is&nbsp;ob.j:"+ob.j);&nbsp;<BR>}&nbsp;<BR>public&nbsp;native&nbsp;int&nbsp;test();&nbsp;<BR>static&nbsp;<BR>{&nbsp;<BR>System.loadLibrary("NativeDemo");&nbsp;<BR>}&nbsp;<BR>}&nbsp;<BR><BR>2.Compile&nbsp;file&nbsp;NativeDemo.java&nbsp;<BR>Javac&nbsp;NativeDemo.java&nbsp;<BR><BR>3.Use&nbsp;javah.exe&nbsp;to&nbsp;produce&nbsp;file&nbsp;NativeDemo.c&nbsp;and&nbsp;NativeDemo.h&nbsp;<BR>a&nbsp;:&nbsp;javah&nbsp;NativeDemo&nbsp;to&nbsp;produce&nbsp;NativeDemo.h&nbsp;which&nbsp;is:&nbsp;<BR>/*&nbsp;DO&nbsp;NOT&nbsp;EDIT&nbsp;THIS&nbsp;FILE&nbsp;-&nbsp;it&nbsp;is&nbsp;machine&nbsp;generated&nbsp;*/&nbsp;<BR>#include&nbsp;&lt;native.h&gt;&nbsp;<BR>/*&nbsp;Header&nbsp;for&nbsp;class&nbsp;NativeDemo&nbsp;*/&nbsp;<BR><BR>#ifndef&nbsp;_Included_NativeDemo&nbsp;<BR>#define&nbsp;_Included_NativeDemo&nbsp;<BR><BR>#pragma&nbsp;pack(4)&nbsp;<BR><BR>typedef&nbsp;struct&nbsp;ClassNativeDemo&nbsp;{&nbsp;<BR>long&nbsp;i;&nbsp;<BR>long&nbsp;j;&nbsp;<BR>}&nbsp;ClassNativeDemo;&nbsp;<BR>HandleTo(NativeDemo);&nbsp;<BR><BR>#pragma&nbsp;pack()&nbsp;<BR><BR>#ifdef&nbsp;__cplusplus&nbsp;<BR>extern&nbsp;"C"&nbsp;{&nbsp;<BR>#endif&nbsp;<BR>extern&nbsp;long&nbsp;NativeDemo_test(struct&nbsp;HNativeDemo&nbsp;*);&nbsp;<BR>#ifdef&nbsp;__cplusplus&nbsp;<BR>}&nbsp;<BR>#endif&nbsp;<BR>#endif&nbsp;<BR>b&nbsp;:&nbsp;use&nbsp;javah&nbsp;-stubs&nbsp;NativeDemo&nbsp;to&nbsp;produce&nbsp;NativeDemo.c&nbsp;which&nbsp;seems&nbsp;as:&nbsp;<BR>/*&nbsp;DO&nbsp;NOT&nbsp;EDIT&nbsp;THIS&nbsp;FILE&nbsp;-&nbsp;it&nbsp;is&nbsp;machine&nbsp;generated&nbsp;*/&nbsp;<BR>#include&nbsp;&lt;StubPreamble.h&gt;&nbsp;<BR><BR>/*&nbsp;Stubs&nbsp;for&nbsp;class&nbsp;NativeDemo&nbsp;*/&nbsp;<BR>/*&nbsp;SYMBOL:&nbsp;"NativeDemo/test()I",&nbsp;Java_NativeDemo_test_stub&nbsp;*/&nbsp;<BR>__declspec(dllexport)&nbsp;stack_item&nbsp;*Java_NativeDemo_test_stub(stack_item&nbsp;*_P_,struct&nbsp;execenv&nbsp;*_EE_)&nbsp;{&nbsp;<BR>extern&nbsp;long&nbsp;NativeDemo_test(void&nbsp;*);&nbsp;<BR>_P_[0].i&nbsp;=&nbsp;NativeDemo_test(_P_[0].p);&nbsp;<BR>return&nbsp;_P_&nbsp;+&nbsp;1;&nbsp;<BR>}&nbsp;<BR>4.&nbsp;Write&nbsp;your&nbsp;own&nbsp;implimentation&nbsp;of&nbsp;method&nbsp;test()&nbsp;<BR>//file&nbsp;name&nbsp;test.c&nbsp;<BR>#include&nbsp;&lt;StubPreamble.h&gt;&nbsp;<BR>#include&nbsp;"nativedemo.h"&nbsp;<BR>#include&nbsp;&lt;stdio.h&gt;&nbsp;<BR><BR>long&nbsp;NativeDemo_test(HNativeDemo&nbsp;*this)&nbsp;<BR>{&nbsp;<BR>printf("hello:!\n");&nbsp;<BR>printf("this&nbsp;is&nbsp;in&nbsp;the&nbsp;native&nbsp;method!\n");&nbsp;<BR>return&nbsp;(unhand(this)-&gt;i)*2;&nbsp;<BR>}&nbsp;<BR><BR>5.&nbsp;link&nbsp;NativeDemo.c&nbsp;and&nbsp;test.c&nbsp;to&nbsp;produce&nbsp;NativeDemo.dll&nbsp;<BR>Use&nbsp;VC++5.0&nbsp;tools&nbsp;:Cl.exe&nbsp;<BR>Cl&nbsp;/GD&nbsp;NativeDemo.c&nbsp;test.c&nbsp;/LD&nbsp;<BR>then&nbsp;we&nbsp;get&nbsp;NativeDemo.dll&nbsp;<BR><BR><BR>NativeDemo.c&nbsp;<BR>test.c&nbsp;<BR>Generating&nbsp;Code...&nbsp;<BR><BR>/out:NativeDemo.dll&nbsp;<BR>/dll&nbsp;<BR>/implib:NativeDemo.lib&nbsp;<BR>NativeDemo.obj&nbsp;<BR>test.obj&nbsp;<BR>Creating&nbsp;library&nbsp;NativeDemo.lib&nbsp;and&nbsp;object&nbsp;NativeDemo.ex&nbsp;<BR>Press&nbsp;any&nbsp;key&nbsp;to&nbsp;continue&nbsp;<BR><BR><BR><BR><BR>6.Run&nbsp;<BR><BR>java&nbsp;NativeDemo&nbsp;<BR><BR>we&nbsp;get&nbsp;the&nbsp;such&nbsp;result:&nbsp;<BR><BR>D:\vj11user\native&gt;java&nbsp;NativeDemo&nbsp;<BR>hello:!&nbsp;<BR>this&nbsp;is&nbsp;in&nbsp;the&nbsp;native&nbsp;method!&nbsp;<BR>this&nbsp;is&nbsp;ob.i:10&nbsp;<BR><BR>this&nbsp;is&nbsp;ob.j:20&nbsp;<BR><BR>D:\vj11user\native&gt;&nbsp;<BR><BR><BR>NOTE:&nbsp;<BR>Do&nbsp;not&nbsp;forget&nbsp;this:&nbsp;<BR>c:&gt;&nbsp;set&nbsp;INCLUDE=d:\java\include;d:\java\win32;%INCLUDE%&nbsp;<BR>C:&gt;set&nbsp;LIB&nbsp;=d:\java\lib;%LIB%&nbsp;<BR>where&nbsp;d:\java&nbsp;is&nbsp;the&nbsp;directory&nbsp;of&nbsp;your&nbsp;jdk&nbsp;<BR><BR>new&nbsp;version&nbsp;jdk1.2.1&nbsp;:&nbsp;<BR><BR>With&nbsp;new&nbsp;jdk1.2.1&nbsp;:&nbsp;<BR><BR>1.javac&nbsp;NativeDemo.java&nbsp;<BR><BR>2.&nbsp;javah&nbsp;NativeDemo&nbsp;to&nbsp;produce&nbsp;head&nbsp;file&nbsp;(You&nbsp;need&nbsp;not&nbsp;to&nbsp;javah&nbsp;-stubs&nbsp;NativeDemo&nbsp;to&nbsp;produce&nbsp;NativeDemo.c&nbsp;file),&nbsp;<BR><BR>You&nbsp;don`t&nbsp;need&nbsp;the&nbsp;c&nbsp;file.&nbsp;Just&nbsp;the&nbsp;NativeDemo.h&nbsp;is&nbsp;sufficient!&nbsp;<BR><BR>3.Use&nbsp;VC++&nbsp;produce&nbsp;a&nbsp;window&nbsp;dll&nbsp;project&nbsp;and&nbsp;add&nbsp;the&nbsp;NativeDemo.h&nbsp;to&nbsp;it.&nbsp;<BR><BR>then&nbsp;implement&nbsp;the&nbsp;function.&nbsp;All&nbsp;is&nbsp;OK!&nbsp;<BR>NOTE:&nbsp;the&nbsp;data&nbsp;type&nbsp;conversion&nbsp;between&nbsp;java&nbsp;and&nbsp;c++.See&nbsp;jni.h&nbsp;for&nbsp;more&nbsp;information.&nbsp; 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