Why "DLLs with JNative" demo "Cannot find class or type named org.xvolks.jnative.util.ANT_DLL"?

carsonc

Dear All,

I am trying to implement DLL calls in my code and am starting with the tutorial on the wiki. I copied and pasted the code from the wiki, and include it here:

DLL_test_1.pde

import org.xvolks.test.bug.*;
// ... the other imports ...
import org.xvolks.jnative.com.*;

void setup()
{
  JNative.setLoggingEnabled(true); // show what JNative is doing!
  try
  {
    int blah=org.xvolks.jnative.util.ANT_DLL.ANT_Init((byte)0,(short)57600); // Call the first native function. This initializes the USB radio via the manufacturer's DLL. >>>>>THIS IS THE LINE THAT FAILS<<<<<
    print(blah); // should return '1' upon success. This was easy so far!
  }
  catch (NativeException e) // traps in case anything naughty happens
  {
  e.printStackTrace();
  }
  catch (IllegalAccessException e)
  {
    e.printStackTrace();
  }
}


void draw()
{
 exit(); // I put this in to kill the program after compiling
}

ANT_DLL.java

package org.xvolks.jnative.util;

import processing.core.*;

import org.xvolks.test.bug.*;
// ... the other imports ...
import org.xvolks.jnative.com.*;

public class ANT_DLL extends PApplet
{
  public static final String DLL_NAME = "ANT_DLL.DLL";

  //Cache the JNative object between calls.
  private static JNative nANT_Init;  // Native-side function names
  private static JNative nANT_AssignResponseFunction; //one for each DLL function you will use...

  // The actual DLL export, most likely from API documentation / header file:
  // __declspec(dllexport) BOOL ANT_Init(UCHAR ucUSBDeviceNum, USHORT usBaudrate);

  // Java-side function name
  public static int ANT_Init(byte ucUSBDeviceNum, short usBaudrate) throws NativeException, IllegalAccessException 
  {
    if(nANT_Init == null) 
    {
      nANT_Init = new JNative(DLL_NAME, "_ANT_Init");  // The actual "decorated" name in the DLL
      //BOOL is in fact an INT
      nANT_Init.setRetVal(Type.INT);  // tell JNative's DLL what kind of return data to expect
    }

    nANT_Init.setParameter(0, ucUSBDeviceNum); // tell JNative's DLL what data to pass to the native function, in what order.
    nANT_Init.setParameter(1, usBaudrate);    // ...
    nANT_Init.invoke();  // Finally, execute the native function

    return nANT_Init.getRetValAsInt(); // get native call's return value
  }
}

When I compile, I get:

Cannot find class or type named "org.xvolks.jnative.util.ANT_DLL"

I know that this code should not fully run on my machine, as I have nothing called "ANT_DLL.DLL", but I would expect it to fail at a different point, preferably inside the .java file. I have tried running as Administrator, but that doesn't change anything.

I am running Processing 2.1.1 on Windows 7 64-bit.

What am I missing here? Where should this fail if the code compiled properly, but was missing the proper DLL? Is this a Processing 2.x vs 1.x issue?

Thanks for your help!

carsonc

I closed out processing, re-opened the sketch, only to find the .java file was gone (!). I copied and pasted the above text back into ANT_DLL.java and now I get:

Problem moving ANT_DLL.java to the build folder
java.io.IOException: The filename, directory name, or volume label syntax is incorrect

PhiLho

Processing doesn't handle packages, not even in .java files. You should compile with the real Java compiler.

Note that your ANT_DLL.java file should reside in a org/xvolks/jnative/util folder.

Or drop the package definition, if that's only for your own usage.