forked from bosun-monitor/bosun
/
iunknown.go
73 lines (62 loc) · 1.25 KB
/
iunknown.go
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package ole
import (
"syscall"
"unsafe"
)
type IUnknown struct {
lpVtbl *pIUnknownVtbl
}
type pIUnknownVtbl struct {
pQueryInterface uintptr
pAddRef uintptr
pRelease uintptr
}
type UnknownLike interface {
QueryInterface(iid *GUID) (disp *IDispatch, err error)
AddRef() int32
Release() int32
}
func (v *IUnknown) QueryInterface(iid *GUID) (disp *IDispatch, err error) {
disp, err = queryInterface(v, iid)
return
}
func (v *IUnknown) MustQueryInterface(iid *GUID) (disp *IDispatch) {
disp, _ = queryInterface(v, iid)
return
}
func (v *IUnknown) AddRef() int32 {
return addRef(v)
}
func (v *IUnknown) Release() int32 {
return release(v)
}
func queryInterface(unk *IUnknown, iid *GUID) (disp *IDispatch, err error) {
hr, _, _ := syscall.Syscall(
unk.lpVtbl.pQueryInterface,
3,
uintptr(unsafe.Pointer(unk)),
uintptr(unsafe.Pointer(iid)),
uintptr(unsafe.Pointer(&disp)))
if hr != 0 {
err = NewError(hr)
}
return
}
func addRef(unk *IUnknown) int32 {
ret, _, _ := syscall.Syscall(
unk.lpVtbl.pAddRef,
1,
uintptr(unsafe.Pointer(unk)),
0,
0)
return int32(ret)
}
func release(unk *IUnknown) int32 {
ret, _, _ := syscall.Syscall(
unk.lpVtbl.pRelease,
1,
uintptr(unsafe.Pointer(unk)),
0,
0)
return int32(ret)
}