JNI Netbeans and Cygwin Compile problem

188 New Member

Hi All,

Am working on a Java application in which I have to use the JNI to Interface with some native code for both windows and unix. Am using netbeans IDE with the C/C++ pack installed. Am also using Cygwin as my compiler (gcc), this is ostensibly because I hope this compiler will also compile the unix native libraries since I don't have a Linux installation. (I am working on a personal project from the office and can't get linux installed).

First question will it be possible to get native linux libs from Cygwin?

I tried doing a small test using the windows function FindWindow() and I am not able to build it. gcc complains about the jlong type defined by the JNI headers.

Here is the code followed by the netbeans output.

Help is greatly appreciated.

The Java class

Expand|Select|Wrap|Line Numbers

  
public class OslibClass {

    static{

        System.loadLibrary("libOsibClass");

    }
 
    public void OslibClass(){
 
    }

    private static native long getWindowHandle();
 
}

Native code...

Expand|Select|Wrap|Line Numbers

  
#include <OslibClass.h>

#include <windows.h>
 
JNIEXPORT jlong JNICALL Java_org_OslibClass_getWindowHandle

(JNIEnv *, jclass){

    jlong handle;

    HWND hwnd = FindWindow("SunAwtFrame","GetHandle - NetBeans IDE 6.1");

    handle = hwnd;

    return handle;

}

Netbeans Output...

Expand|Select|Wrap|Line Numbers

 
Running "rm -rf build/Debug/Cygwin-Windows/src/OslibClass.o" in C:\Documents and Settings\Administrator\My Documents\NetBeansProjects\GetHandle
 
Clean successful. Exit value 0.
 
Running "C:\cygwin\bin\make.exe -f nbproject/Makefile-Debug.mk build/Debug/Cygwin-Windows/src/OslibClass.o" in C:\Documents and Settings\Administrator\My Documents\NetBeansProjects\GetHandle
 
mkdir -p build/Debug/Cygwin-Windows/src

gcc.exe    -c -g -IC\:/Program\ Files/Java/jdk1.6.0_07/include/win32 -IC\:/Program\ Files/Java/jdk1.6.0_07/include -I. -fPIC  -o build/Debug/Cygwin-Windows/src/OslibClass.o src/OslibClass.c

src/OslibClass.c:1: warning: -fPIC ignored for target (all code is position independent)

In file included from C:/Program Files/Java/jdk1.6.0_07/include/jni.h:27,

                 from ./OslibClass.h:2,

                 from src/OslibClass.c:1:

C:/Program Files/Java/jdk1.6.0_07/include/win32/jni_md.h:16: error: parse error before "jlong"

C:/Program Files/Java/jdk1.6.0_07/include/win32/jni_md.h:16: warning: data definition has no type or storage class

In file included from ./OslibClass.h:2,

                 from src/OslibClass.c:1:

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:108: error: parse error before "jlong"

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:108: warning: no semicolon at end of struct or union

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:112: error: parse error before '}' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:112: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:264: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:279: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:286: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:293: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:300: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:307: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:314: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:316: warning: no semicolon at end of struct or union

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:318: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:319: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:319: error: 'jlong' redeclared as different kind of symbol

C:/Program Files/Java/jdk1.6.0_07/include/win32/jni_md.h:16: error: previous declaration of 'jlong' was here

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:319: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:320: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:321: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:321: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:321: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:328: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:335: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:342: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:351: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:360: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:369: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:378: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:387: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:396: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:398: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:399: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:399: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:400: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:402: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:402: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:403: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:405: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:405: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:405: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:414: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:423: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:432: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:449: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:450: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:450: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:469: error: parse error before "jlong"

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:483: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:490: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:497: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:504: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:511: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:518: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:520: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:521: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:521: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:522: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:523: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:523: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:524: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:525: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:525: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:525: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:532: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:539: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:546: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:562: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:563: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:563: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:582: error: parse error before "jlong"

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:644: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:645: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:662: error: parse error before "jlong"

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:679: error: parse error before "jlong"

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:696: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:740: error: parse error before "jlong"

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:743: error: parse error before '*' token

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:744: error: `jlong' declared as function returning a function

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:744: warning: data definition has no type or storage class

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:750: error: parse error before '}' token

In file included from src/OslibClass.c:1:

./OslibClass.h:15: warning: `__stdcall__' attribute only applies to function types

./OslibClass.h:15: error: 'jlong' redeclared as different kind of symbol

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:744: error: previous declaration of 'jlong' was here

./OslibClass.h:15: error: 'jlong' redeclared as different kind of symbol

C:/Program Files/Java/jdk1.6.0_07/include/jni.h:744: error: previous declaration of 'jlong' was here

./OslibClass.h:15: error: parse error before "Java_org_OslibClass_getWindowHandle"

src/OslibClass.c:5: warning: `__stdcall__' attribute only applies to function types

src/OslibClass.c:5: error: parse error before "Java_org_OslibClass_getWindowHandle"

src/OslibClass.c:8: error: initializer element is not constant

src/OslibClass.c:9: warning: initialization makes integer from pointer without a cast

src/OslibClass.c:9: error: initializer element is not constant

src/OslibClass.c:9: warning: data definition has no type or storage class

src/OslibClass.c:10: error: parse error before "return"

make: *** [build/Debug/Cygwin-Windows/src/OslibClass.o] Error 1
 
Build failed. Exit value 2.

Sep 17 '08 #1

Subscribe Reply

6671

myusernotyours

188

New Member

Hi,
Seems I figured it out somehow.
In netbeans I was pointing the include path for the JNI headers to where my JDK windows installer had installed them. i.e ..Program files\\java.... . I found out though that cygwin comes with it's own java compiler (or is it just headers??) and netbeans knows where to find them. So I removed my include from the nebeans settings and voila!!

Din't get to figure out what was really happening. Perherps someone can tell us.
Now, I kind of want to build a native library (.so) but when I trie it, the linker doesn't seem to find some references. Example I keep getting..

undefined reference to `_dlopen'
undefined reference to `___getreent'
undefined reference to `_dlerror'
undefined reference to `___getreent'
In function `getAwtLockFunc tions':

and so on for very many functions.

Even if I put the directory with these .a files explicitly in the link properties in netbeans, I still get the same errors.

Regards,

Alex.

Regards,

Alex.

Sep 18 '08 #2

cadii

New Member

Hi,
I'm having the same undefined reference problem. How did you solve it ?

Any help highly appreciated

Jun 7 '09 #3

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