[SOLVED] couldn't find function symbol in library

couldn't find function symbol in library

Declaring SCardStatus function causes the error: "couldn't find function symbol in library"

The Code is as follows:

Cu.import('resource://gre/modules/ctypes.jsm');
var is64bit = ctypes.voidptr_t.size == 4 ? false : true;
var ifdef_UNICODE = true;
var TYPES = {
    ABI: is64bit ? ctypes.default_abi : ctypes.winapi_abi,
    CHAR: ctypes.char,
    DWORD: ctypes.uint32_t,
    LONG: ctypes.long,
    LPCVOID: ctypes.voidptr_t,
    ULONG_PTR: is64bit ? ctypes.uint64_t : ctypes.unsigned_long,
    WCHAR: ctypes.jschar,
};
TYPES.LPSTR = TYPES.CHAR.ptr;
TYPES.LPDWORD = TYPES.DWORD.ptr;
TYPES.LPWSTR = TYPES.WCHAR.ptr;
TYPES.SCARDHANDLE = TYPES.ULONG_PTR;
TYPES.LPBYTE = TYPES.LPSTR;
TYPES.LPTSTR = ifdef_UNICODE ? TYPES.LPWSTR : TYPES.LPSTR;
var cardLib = ctypes.open('Winscard');
var SCardStatus = cardLib.declare('SCardStatus', TYPES.ABI, TYPES.LONG, TYPES.SCARDHANDLE, TYPES.LPTSTR, TYPES.LPDWORD, TYPES.LPDWORD, TYPES.LPDWORD, TYPES.LPBYTE, TYPES.LPDWORD );

I guess that TYPES.LPBYTE is not correct, according to https://msdn.microsoft.com/en-us/library/windows/desktop/aa379803%28v=vs.85%29.aspx , LPBYTE should be a Pointer to a 32-byte buffer that receives the ATR string from the currently inserted card, if available. However I could not fix it, I appreciate any helps in advanced.

Solution

In winapi if the functions have two versions, unicode version and ascii verison IF it takes strings. So the docs show this accepts characters, so on the page it shows: SCardStatusW (Unicode) and SCardStatusA (ANSI) so you have to define it like this: var SCardStatus = cardLib.declare(ifdef_UNICODE ? 'SCardStatusW' : 'SCardStatusA', ....