Hi,

I am developing a managed .dll in Visual C++ that has several other dlls as its dependencies. After I compiled it, I created a lib folder in my Java Eclipse project and put my dll and all the other dependencies inside it.

My first problem is that whenever I have to access my dll I need to provide the full system path, I cannot just write its name. Therefore the statement below works: *

public * Lumidigm *INSTANCE* = (Lumidigm) Native.*loadLibrary*("C:\\Itautec\\Central Biometrica\\Java\\LumidigmSensor\\lib\\Lumidigm\\LumidigmHelper.dll", Lumidigm.*class*); But this other statement throws the following exception: *

public * Lumidigm *INSTANCE* = (Lumidigm) Native.*loadLibrary*( "LumidigmHelper.dll", Lumidigm.*class*);

Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library '\lib\Lumidigm\LumidigmHelper.dll': Não foi possível encontrar o módulo especificado.

at com.sun.jna.NativeLibrary.loadLibrary( *NativeLibrary.java:145*)

at com.sun.jna.NativeLibrary.getInstance( *NativeLibrary.java:188*)

at com.sun.jna.Library$Handler.<init>( *Library.java:123*)

at com.sun.jna.Native.loadLibrary( *Native.java:255*)

at com.sun.jna.Native.loadLibrary( *Native.java:241*)

at br.com.itautec.centralbiometrica.nativeInterfaces.lumidigm.Lumidigm.<clinit>( *Lumidigm.java:12*)

at br.com.itautec.innovatricsEngine.Program.main( *Program.java:34*) The dll's path is <project folder>\lib\Lumidigm. Do I have to include this path on the classpath for this to work? If so how can I do that with Eclipse?

My second problem is that I am trying to put some logging inside my dll and I am using the log4net api to do it. The thing is that I keep getting the error below:

# # An unexpected error has been detected by Java Runtime Environment: # # Internal Error (0xe0434f4d), pid=3772, tid=468 # # Java VM: Java HotSpot(TM) Client VM (1.6.0_02-b06 mixed mode, sharing) # Problematic frame: # C [kernel32.dll+0x12a5b] # # An error report file with more information is saved as hs_err_pid3772.log # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp #

I think that this is because the dll is not finding the log4net.xml or the log4net.dll, but I am not sure. I have tested this dll with another C++ program and it worked fine, plus all the required dlls and xmls are in the same folder as my dll.

Do any of you have a recommendation as what I should do? Does anyone uses logging in their dlls? Should I continue to use log4net or do you recommend another api?

I also thought about making all of my functions return a char* with the logging information, this way I could log everything in the java program using log4j, although this seems like a rather dirty solution to me...

Thank you all, Felipe