Re: Loading a 3rd party from a java code
On 15-02-2011 18:35, Ian Shef wrote:
Arne Vajh?j<arne@vajhoej.dk> wrote in news: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.
And furthermore...
- Your code calls tal_connect, but the error message is for vtc_connect.
- char * is NOT the same as java.lang.String
Both will somewhat become obvious when creating the
JNI wrapper.
The output from javah will show a lot.
Arne
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