My bad. it turns out that the API dll has a directive
#pragma pack (1)
On Thursday, November 24, 2022 at 7:08:54 AM UTC+2 Maxim Velivanov wrote:
> Hi,
>
> I'm developing a Go wrapper for a dll.
> dll contains the following structure:
> struct ck_version {
> unsigned char major;
> unsigned char minor;
> };
>
> struct ck_info {
> struct ck_version cryptoki_version;
> unsigned char manufacturer_id[32];
> ck_flags_t flags;
> unsigned char library_description[32];
> struct ck_version library_version;
> };
>
> in Go there is its analogue:
> type Ck_version struct {
> Major uint8
> Minor uint8
> }
>
> type Ck_info struct {
> Cryptoki_version Ck_version
> Manufacturer_id [32]byte
> Flags uint32
> Library_description [32]byte
> Library_version Ck_version
> }
>
> when i call the function
> info := Ck_info{}
> rv, _, _ := c_GetInfo.Call(uintptr(unsafe.Pointer(&info)))
>
> then I get the data offset starting from the flags field.
>
> I understand that Go has different data alignment in structures than C
> compiler. But how then does a wrapper with tons of structures work in this
> project golang.org/x/sys/windows? Maybe I missed something?
>
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