The reason I think correct C type is used is because in the "winscard.h" C
header file, the expected type is LPSCARD_READERSTATE.
And , in the golang cgo code, i.e. scard_unix.go, the argument 3 is cast as
(C.LPSCARD_READERSTATE).
*Further details (not sure if is useful): *
I found that in another C header file (pcsclite.h), LPSCARD_READERSTATE is
defined as:
typedef struct
{
const char *szReader;
void *pvUserData;
DWORD dwCurrentState;
DWORD dwEventState;
DWORD cbAtr;
unsigned char rgbAtr[MAX_ATR_SIZE];
}
SCARD_READERSTATE, *LPSCARD_READERSTATE;
And, on Windows , I could compile the code but failed on linux.
On Tuesday, April 4, 2017 at 9:59:12 AM UTC+8, Nicholas Kho wrote:
>
> I think the correct C type is used.
>
> refer: https://github.com/ebfe/scard/blob/master/scard_unix.go
> Line 57:
>
> func scardGetStatusChange(ctx uintptr, timeout uint32, states
> []scardReaderState) Error {
> r := C.SCardGetStatusChange(C.SCARDCONTEXT(ctx), C.DWORD(timeout),
> (C.LPSCARD_READERSTATE)(unsafe.Pointer(&states[0])), C.DWORD(len(states)))
> return Error(r)
>
>
>
>
> On Tuesday, April 4, 2017 at 9:44:41 AM UTC+8, Ian Lance Taylor wrote:
>>
>> On Mon, Apr 3, 2017 at 5:53 PM, clashion <[email protected]> wrote:
>> >
>> > I tried to compile the code from https://github.com/ebfe/scard .
>> >
>> > Error during compilation.
>> >
>> >
>> > Environment: go1.8 , linux
>> >
>> >
>> > Error Message:
>> >
>> >
>> > cgo-gcc-prolog:198:2: warning: passing argument 3 of
>> ‘SCardGetStatusChange’
>> > from incompatible pointer type [enabled by default]
>> >
>> >
>> > /usr/include/PCSC/winscard.h:64:16: note: expected
>> ‘LPSCARD_READERSTATE’ but
>> > argument is of type ‘struct *’
>> > PCSC_API LONG SCardGetStatusChange(SCARDCONTEXT hContext,
>> >
>> >
>> >
>> > Need advice how to solve this. Thanks.
>>
>> You are using cgo code. This error comes from the C compiler. You
>> need to use the correct type in your C code.
>>
>> Ian
>>
>
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