Hi all

I have a card reader (SCR335) i have downloaded its driver, its wrapper, installed them, and im trying to read a card using the jna API. The dll im trying to load is the Scard32 (im sure this is the right dll i have to use) which has only one function the ScardComand (the spelling is right though the prefix comand is written with single m). The Scard32 uses the stdcall calling convention. Here is the definition of the ScardComand

Response=SCardComand (Handle, Cmd, CmdLen, DataIn, DataInLen, DataOut, DataOutLen) LPINT Handle /* pointer to a signed 32 bit integer */ LPSTR Cmd /* string pointer */ LPINT CmdLen /* pointer to a signed 32 bit integer */ LPSTR DataIn /* pointer to a string array */ LPINT DataInLen /* pointer to a signed 32 bit integer */ LPSTR DataOut /* pointer to a string array */ LPINT DataOutLen /* pointer to a signed 32 bit integer */

The code i wrote to load the dll and mirror its function is the following

public interface Scard32 extends StdCallLibrary { //StdCallFunctionMapper mapper = new StdCallFunctionMapper(); Scard32 INSTANCE = (Scard32) Native.loadLibrary("Scard32", Scard32.class);

public int ScardComand(int Handle, String Cmd, int CmdLen, String dataIn, int dataInLen, String dataOut, int dataoutlen);

}

....main.... Scard32 lib = Scard32.INSTANCE;

try { String output = " ";

lib.ScardComand(0, "Card,MemRead,128,6", 0, new String(), 0, output, 0);

} catch (UnsatisfiedLinkError e) {

e.printStackTrace(); }

here is what i get when i run the code

java.lang.UnsatisfiedLinkError: Error looking up function 'ScardComand': ??? ???? ?????? ?? ?????????? ? ??????????? ??????????.

at com.sun.jna.Function.<init>(Function.java:126) at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java: 219) at com.sun.jna.Library$Handler.invoke(Library.java:191) at $Proxy0.ScardComand(Unknown Source)

Unfortunately i always get this exception which means that the dll is properly loaded but i dont do the right function mapping. I tried passing integer values as values to the function, with simple string variables, IntByValue values with WString values for the strings, but with no luck (also tried the char array for strings). I tried to use callbacks but i suppose in the wrong way.

I have no time left to put on this anymore, so could you please send me a code sample with the mapping of the ScardComand i should use?

Any answers would be gratefully appreciated. Thank you for your time.

evsav

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