[go-nuts] Syscall trouble with parameter handling

[snmed]

Hi all

I try to use the syscall package to call a native Windows API and 
struggling with the call parameters. I calling the api

HRESULT WINAPI AmsiInitialize(
  _In_  LPCWSTR      appName,
  _In_  DWORD        coInit,
  _Out_ HAMSICONTEXT *amsiContext
);


my test app looks like this
package main

import (
    "fmt"

    "syscall"
    "unsafe"

    "golang.org/x/sys/windows"
)

func main() {
    h := windows.MustLoadDLL("Amsi.dll")
    defer h.Release()

    ainit := h.MustFindProc("AmsiInitialize")
    auinit := h.MustFindProc("AmsiUninitialize")
    ascanstring := h.MustFindProc("AmsiScanString")

    var context uintptr
    r1, r2, err := ainit.Call(uintptr(unsafe.Pointer(syscall.
StringToUTF16Ptr("Scanner Tool"))), 0, uintptr(unsafe.Pointer(&context)))
    fmt.Println(context)
    fmt.Println(r1, r2, err)
    // output:
    // 0
    // 2147942487 0 The operation completed successfully.

unfortunately the call succeeds but the context is still zero. Probably i 
call the function with the wrong parameters but i can't work it out.
Has anybody a idea what could be wrong?

Thank you in advance
snmed

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