jna加载库

Question

i'm having a problem on loading a dll with jna. While i can debug the code within eclipse, i get an Exception when i export and run it as a jar file:

java.lang.UnsatisfiedLinkError: unable to load library 'SiUSBXp'

Any ideas why it does not find my dll when i run it as a jar-file?

Thanks!!!!

public interface SiUSBXp extends StdCallLibrary {
    byte SI_GetNumDevices(IntByReference numdevices);
    byte SI_GetProductString( int deviceNum, byte[] productString, int options );
    byte SI_Open(IntByReference numdevices);
}

static SiUSBXp INSTANCE;

public static void main(String[] args) {
    System.setProperty("jna.library.path","SiUSBXp.dll");
    HashMap<String, StdCallFunctionMapper> optionMap = new HashMap<String, StdCallFunctionMapper>();
    StdCallFunctionMapper myMapper = new StdCallFunctionMapper();
    optionMap.put(Library.OPTION_FUNCTION_MAPPER, myMapper);
    INSTANCE = (SiUSBXp) Native.loadLibrary("SiUSBXp", SiUSBXp.class, optionMap);
}

------------------ EDIT ----------------------

The dll is located in the same folder as the jar is

------------------ EDIT 2 ---------------------

I've just tried to run it within windows xp and it works .. but it does not within windows 7 (64 bit)

------------------ EDIT 3 --------------------- I've solved the problem ... It was due to the java versions installed ... I removed them all, and then only installed the x86 version of java ... after that it worked perfectly

Answer 1

将DLL放入“当前文件夹”或系统变量PATH中，或将-Djna.library.path=(path to the dll)用作VM切换器，而不是硬编码。

Answer 2

I've had strange problems with jna 3.3.0 not finding libraries, try jna 3.2.7. Also, besides jna.library.path , it could help to set java.library.path too. And I'm not sure if you should put library name in the path and not the folder the library is in. Try to set it to ".".