* xjdrew <[email protected]> [170522 02:06]:
> How can i use this kind of Go in windows? my machine is 64bit also. If I
> download the amd64 Go, the pointer size will be 8 bytes.
>
> My real issue is , when I call win32 api, uint64 type in the struct of
> win32 is aligned to 8 bytes.
> I have to pad the go struct by manual to make it work with win32 api.
>
> > On Friday, May 19, 2017 at 7:28:54 AM UTC-4, xjdrew wrote:
> >> Code as below, playground url(https://play.golang.org/p/XSx--6uF0E):
> >>
> >> package main
> >>
> >> import "fmt"
> >> import "unsafe"
> >>
> >> type A struct {
> >> a uint8
> >> b uint64
> >> }
> >> func main() {
> >> a := &A{}
> >> fmt.Println(unsafe.Sizeof(a))
> >> fmt.Println(unsafe.Sizeof(*a))
> >> }
As Dan said, you have not given us enough information to provide you
with useful help (at least not without a lot of good guessing on our
part as to what you are really trying to do). I am guessing that you
are importing "golang.org/x/sys/windows" and using syscall to call
functions in DLLs. If so, what DLL and what entry? What is the C
structure you are trying to pass to that entry? Must it work in both
win32 and win64?
When you are mixing Go and C ABIs, there is likely to be some manual
alignment, especially if you are trying to do this on multiple
OS/architecture combinations (e.g. win32 and win64).
I believe (but am not 100% positive) that on all platforms supported by
Go, the following will produce the same alignment:
type A struct {
a uint8
_ uint32
b uint64
}
...Marvin
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