I try use dll calls in my FWPPC application. But I confused ... (I havn't strong C knowledge)
I want open Motorola RFID reader. Reader has dll for handle RFID cals
//
Dll Name:RFIDAPI32.dll
File Location:\windows\rfidapi32.dll
//
Is a functions.
DWORD WINAPI RFID_Open(HANDLE phReader);
DWORD WINAPI RFID_Close(HANDLE phReader);
It is example (c++):
//
HANDLE hRFIDReader;
if(RFID_Open(&HRFIDReader) == RFID_SUCCESS)
{
RFID_Close(&hRFIDReader);
}
//
RFID_SUCCESS 0 Function succeeded.
RFID_INVALID_HANDLE 17 Invalid device handle provided.
I declare this functions in my application:
//
DLL FUNCTION RFID_Open(@hRFIDReader as PTR ) ;
AS DWORD LIB "rfidapi32.dll"
DLL FUNCTION RFID_Close(@hRFIDReader as PTR ) ;
AS DWORD LIB "rfidapi32.dll"
//
And run next code.
//-------------------------------------------------------------------------//
Function RunUdlTags()
//-------------------------------------------------------------------------//
Local nHandle:=0
Local nRet
nRet:=RFID_Open(@nHandle)
MsgInfo(str(nRet))
RFID_Close(@nHandle)
Return Nil
RDID_Open always return 17 - invalid device handle.
Is possible that I make mistake in DLL Functions declaration ?
If I call this function in this way
HB_FUNC(OPEN_RFID)
{
nStatus=RFID_Open(&hReader);
if(nStatus == RFID_SUCCESS)
{
}
hb_retnl( (LONG) hReader );
}
is work fine.
Best regards
Andrej
