Re: Loading a 3rd party from a java code

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 13 Feb 2011 11:23:19 -0500
Message-ID:
<4d580572$0$23756$14726298@news.sunsite.dk>
On 13-02-2011 03:42, dvir shaty wrote:

  I am trying to load a function from a 3rd party DLL from my java code
(in eclipse).

  Can you please tell me how to do it?

  I tried to use the following:

------------------------------------------------
package tal.packege;
class talclient
{
     static
     {
         System.loadLibrary("talclient");
     }
     public static void main(String ar[])
     {
         System.out.println("Hello world from Java");
         talclient t=new talclient();
   String s = "172.16.10.31";
        int a = 8888;
        int b = 0;
         t.tal_connect(s,a,b);

     }
     public native void tal_connect(String s, int a, int b);
}

------------------------------------------------

I get the following exception:

Exception in thread "main" java.lang.UnsatisfiedLinkError:
tal.packege.talclient.vtc_connect(Ljava/lang/String;II)V
    at tal.packege.talclient.vtc_connect(Native Method)
    at tal.packege.talclient.main(talclient.java:16)

According to the dll help file the arguments are defined as:

int tal_connect( char *servername,
        Int portnum,
        Int options)

The dll is stored in c:\windows\system32.


JNI does not support calling arbitrary functions in a
DLL.

You need to create wrapper function and DLL that is
JNI compatible and call that.

Arne

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