Okay I found a way, this seems to work:
ca := (*[1000000]byte) (unsafe.Pointer(certctx.pbCertEncoded))[:certctx.
cbCertEncoded]
or
mm := make([]byte, certctx.cbCertEncoded)
for i := uint32(0) ; i < certctx.cbCertEncoded; i++ {
mm[i] = *((*byte)(unsafe.Pointer(certctx.pbCertEncoded + uintptr(i)
* unsafe.Sizeof(new(byte)))))
}
Anyway, the vet tool is complaining:
main.go:106: possible misuse of unsafe.Pointer
main.go:109: possible misuse of unsafe.Pointer
This is the code fragment:
104 certctx := new(CERT_CONTEXT)
105
106 certctx = (*CERT_CONTEXT) (unsafe.Pointer(pccert_context))
107
108
109 ca := (*[1000000]byte) (unsafe.Pointer(certctx.pbCertEncoded))[:
certctx.cbCertEncoded]
Is there another way to use syscall return values uintptr without vet
warnings? And which solution should I prefer? I think the later one should
be more safe, isn't it?
Cheers
Am Donnerstag, 14. Dezember 2017 09:29:38 UTC+1 schrieb snmed:
>
> Hi Miki
>
> I'm using syscall package and no C import, but maybe it is possible to use
> this function as well?
>
> Am Donnerstag, 14. Dezember 2017 09:18:26 UTC+1 schrieb Miki Tebeka:
>>
>> Do you mean
>>
>> func C.GoBytes(unsafe.Pointer, C.int) []byte
>>
>> ?
>>
>> On Thursday, December 14, 2017 at 9:05:32 AM UTC+2, snmed wrote:
>>>
>>> Hi all
>>>
>>> I'm trying to map a C structure to an equivalent go struct, but I bumped
>>> into a problem with a pointer to byte that is actually an array of bytes.
>>>
>>> Here is the C struct:
>>>
>>> typedef struct _CERT_CONTEXT {
>>> DWORD dwCertEncodingType;
>>> BYTE *pbCertEncoded;
>>> DWORD cbCertEncoded;
>>> PCERT_INFO pCertInfo;
>>> HCERTSTORE hCertStore;
>>> } CERT_CONTEXT, *PCERT_CONTEXT;
>>>
>>>
>>> and this is my go struct:
>>>
>>> type CERT_CONTEXT struct {
>>> dwCertEncodingType uint32
>>> pbCertEncoded uintptr
>>> cbCertEncoded uint32
>>> pCertInfo uintptr
>>> hCertStore uintptr
>>> }
>>>
>>> for my case I need only the first 3 fields and I do not have any problem
>>> to get 1 and 3, but I can't remember how to translate the second field to a
>>> slice of bytes.
>>> This is how I map the struct from an uintptr and print it to the console:
>>>
>>> certctx = (*CERT_CONTEXT) (unsafe.Pointer(pccert_context))
>>> fmt.Printf("%v\n", certctx)
>>>
>>> >&{1 807520 674 833008 789360}
>>>
>>> Any advise is warmly welcome.
>>>
>>> Cheers,
>>> Sandro
>>>
>>
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