Please help me with structure data alignment

[Maxim Velivanov]

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?

[Maxim Velivanov]

My bad. it turns out that the API dll has a directive

#pragma pack (1)