Subject: How to get a String from JNI?

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Subject: How to get a String from JNI?

Subject: How to get a String from JNI?

2005-09-09 - By Kurien Joseph

Back

Reply: 1 2

This line will go to your C++ code.

jstring str = (env)->NewStringUTF ((char *)"Hello World");

return str;

If you have c then use

jstring str = (*env)->NewStringUTF ((char *)"Hello World");

Looking at your MyNative class... you need not create test1 and test11 will
suffice.

-Kurien

__ __

From: A mailing list for Java(tm) 2 Platform, Enterprise Edition [mailto:J2EE
-INTEREST@(protected)] On Behalf Of Edward King
Sent: Thursday, September 08, 2005 9:36 PM
To: J2EE-INTEREST@(protected)
Subject: How to get a String from JNI?

I want to get a returned String from JNI, but I don't know how to do it, my
code are follows:
//MyNative.java
public class MyNative{
public String test1(String s){
return test11(s);
}
private native String test11(String s);
static{
System.loadLibrary( "MyNative" );
}
public static void main( String[] args ){
MyNative obj = new MyNative();
String c=obj.test1("abc");
System.out.println("--"+c);
}
}

//MyNative.h
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class MyNative */
#ifndef _Included_MyNative
#define _Included_MyNative
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: MyNative
* Method: test11
* Signature: (Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_MyNative_test11
(JNIEnv *, jobject, jstring);

#ifdef __cplusplus
}
#endif
#endif

//MyNative.c
#include <stdio.h>
#include "MyNative.h"
JNIEXPORT jstring JNICALL Java_MyNative_test11
(JNIEnv *env, jobject obj, jstring s){
//How to realize return String to Java???,such as return a string "hello
world",how to realize this function,please give example code.

}

Thanks in advance!

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<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft
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-html40">

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<meta name=Generator content="Microsoft Word 11 (filtered medium)">
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<div class=Section1>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'>This line will go to your C++ code. <o:p></o:p><
/span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'>jstring str = (env)->NewStringUTF ((<font
color=blue><span style='color:blue'>char</span></font> *)"Hello World&quot
;);<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'>return str;</span></font><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o
:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'>If you have c then use<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'>jstring str = (*env)->NewStringUTF ((<font
color=blue><span style='color:blue'>char</span></font> *)"Hello World&quot
;);<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'>Looking at your MyNative class… you need not
create
test1 and test11 will suffice.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'>-Kurien<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10
.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>

<div>

<div class=MsoNormal align=center style='text-align:center'><font size=3
face=SimSun><span style='font-size:12.0pt'>

<hr size=2 width="100%" align=center tabindex=-1>

</span></font></div>

<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <st1:PersonName
w:st="on">A mailing list for Java</st1:PersonName>(tm) 2 Platform, Enterprise
Edition [mailto:J2EE-INTEREST@(protected)] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Edward King<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, September 08, 2005
9:36 PM<br>
<b><span style='font-weight:bold'>To:</span></b> J2EE-INTEREST@(protected)<br>
<b><span style='font-weight:bold'>Subject:</span></b> How to get a String from
JNI?</span></font><o:p></o:p></p>

</div>

<p class=MsoNormal><font size=3 face=SimSun><span style='font-size:12.0pt'><o:p
> </o:p></span></font></p>

<div>

<p class=MsoNormal><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";color:blue'>I want to get
a returned String from JNI, but I don't know how to do it, my code are follows:
<br>
//MyNative.java<br>
public class MyNative{   <br>
 public String test1(String s){<br>
   return test11(s);<br>
 }<br>
 private native String test11(String s); <br>
  static{<br>
   System.loadLibrary( "MyNative" );<br>
  } <br>
 public static void main( String[] args ){<br>
    MyNative obj = new MyNative();<br>
    String c=obj.test1("abc");<br>
    System.out.println("--"+c);<br>
   }<br>
}</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;font-family:"Times New Roman"'> </span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";color:blue'>//MyNative.h
<br>
/* DO NOT EDIT THIS FILE - it is machine generated */<br>
#include <jni.h><br>
/* Header for class MyNative */<br>
#ifndef _Included_MyNative<br>
#define _Included_MyNative<br>
#ifdef __cplusplus<br>
extern "C" {<br>
#endif<br>
/*<br>
 * Class:     MyNative<br>
 * Method:    test11<br>
 * Signature: (Ljava/lang/String;)Ljava/lang/String;<br>
 */<br>
JNIEXPORT jstring JNICALL Java_MyNative_test11<br>
  (JNIEnv *, jobject, jstring);</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;font-family:"Times New Roman"'> </span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";color:blue'>#ifdef
__cplusplus<br>
}<br>
#endif<br>
#endif</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;font-family:"Times New Roman"'> </span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";color:blue'>//MyNative.c
<br>
#include <stdio.h><br>
#include "MyNative.h"<br>
JNIEXPORT jstring JNICALL Java_MyNative_test11<br>
  (JNIEnv *env, jobject obj, jstring s){<br>
   //How to realize return String to Java???,such as  return a
string "hello world",how to realize this function,please give example
code.</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";color:blue'>}</span><
/font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;font-family:"Times New Roman"'> </span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";color:blue'>Thanks in
advance!<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;font-family:"Times New Roman";color:blue'><o:p> <
/o:p></span></font></p>

</div>

</div>

</body>

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