Where do we find best tutorials for JNI

Question

hi every one
i am new to JNI and i want to know where do we can get best examples on JNI.

Answer 1

See this links:
http://www.servertec.com/products/jenie/docs/stec/jenie/Dll.html
http://www.servertec.com/products/jenie/docs/stec/jenie/Function.html
Here are 2 sample codes:
1. have a c DLL (MyDll) stdcall fnc as follows.
stdcall int MyFnc(int FileNo, int IOType, unsigned char * DataToWrite, unsig
ned char * DataRead);
class X {
private native int MyFunc(int fileNo, int IOType, byte[] DataToWrite, byte[]
DataRead);
public static void main(String args[]) {
X p = new X();
byte[] c= new byte[512];
byte[] c2= new byte[512];
int result = p.MyFunc(1,0,c,c2);
System.out.println(result);
static {
System.loadLibrary("MyDll");
2. public class DLLBridge
public DLLBridge() {
public native void RprtMain();
static{
System.loadLibrary("Reports");
public static void main(String[] args) {
DLLBridge dbridge = new DLLBridge();
dbridge.RprtMain();
That is the signature of the C function that you need to write in order to
implement the RprtMain() method that you declared as "native" in your Java DLLBridge class. Assuming you have an existing function in a DLL that you are trying to call, you will typically just write this function to call the other function. If the other function has parameters, you will
typically use JNI functions to get the parameter values and massage them into the form required by that existing function, and do the reverse with the function result.
Of course, there is no requirement that your native method call
pre-written C functions. You can implement your native method any way you want to.
I have not tested the code, just wrote down. Hope this will help you.