ftd2xx.dll error to get device information

Hi, I'm trying to communicate matlab with FTDI 4232. I load the library ftd2xx.dll, open it by FT_Ope n (which is returning 0 for 'connected', 2 for 'not connected' and 3 for 'already connected') and then I just try to get some device information just to have sure that they were connected but with not success.

I tried to use FT_GetDeviceInfoDetail but none of my variable are changed by pointers used in function.

Here is this part of the code: (Have someone any advises?)

%% LOAD DLL [notfound,warnings]=loadlibrary('C:\Users\Danilo\Documents\TSW1400_MATLAB\DLL_Files\ftd2xx.dll', 'C:\Users\Danilo\Documents\TSW1400_MATLAB\DLL_Files\ftd2xx.h');

%% OPEN FTDI dw_handlevalue = int32(0); lpdw_handle = libpointer('int32Ptr', dw_handlevalue); status = calllib('ftd2xx', 'FT_Open', 0, lpdw_handle);

%% CREATE VARIABLES AND POINTERS dw_Index = int32(0);

dw_Flags = uint32(0); lpdw_Flags = libpointer('uint32Ptr', dw_Flags);

dw_Type = uint32(0); lpdw_Type = libpointer('uint32Ptr', dw_Type);

dw_ID = uint32(0); lpdw_ID = libpointer('uint32Ptr', dw_ID);

dw_Locld = uint32(0); %Device Location ID lpdw_Locld = libpointer('uint32Ptr', dw_Locld);

c_SerialNumber = char('0'); %pc_SerialNumber = libpointer('char', c_SerialNumber); pc_SerialNumber = libpointer('voidPtr');

c_Description = char('0'); %pc_Description = libpointer('char', c_Description); pc_Description = libpointer('cstring',c_Description);

%% dw_NumDevs = uint32(0); lpdw_NumDevs = libpointer('uint32Ptr', dw_NumDevs); ft_status = calllib('ftd2xx', 'FT_CreateDeviceInfoList', lpdw_NumDevs);

%% GET DEVICE DETAIL %

ft_status = calllib('ftd2xx','FT_GetDeviceInfoDetail', dw_Index, lpdw_Flags, lpdw_Type, lpdw_ID, lpdw_Locld, pc_SerialNumber, pc_Description, lpdw_handle);