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// 8 february 2014
package main
import (
"syscall"
"unsafe"
)
type WNDCLASS struct {
Style uint32
LpfnWndProc WNDPROC
CbClsExtra int // TODO exact Go type for C int? MSDN says C int
CbWndExtra int // TODO exact Go type for C int? MSDN says C int
HInstance HANDLE // actually HINSTANCE
HIcon HANDLE // actually HICON
HCursor HANDLE // actually HCURSOR
HbrBackground HBRUSH
LpszMenuName *string // TODO this should probably just be a regular string with "" indicating no name but MSDN doesn't say if that's legal or not
LpszClassName string
}
type _WNDCLASSW struct {
style uint32
lpfnWndProc uintptr
cbClsExtra int
cbWndExtra int
hInstance HANDLE
hIcon HANDLE
hCursor HANDLE
hbrBackground HBRUSH
lpszMenuName *uint16
lpszClassName *uint16
}
func (w *WNDCLASS) toNative() *_WNDCLASSW {
menuName := (*uint16)(nil)
if w.LpszMenuName != nil {
menuName = syscall.StringToUTF16Ptr(*w.LpszMenuName)
}
return &_WNDCLASSW{
style: w.Style,
lpfnWndProc: syscall.NewCallback(w.LpfnWndProc),
cbClsExtra: w.CbClsExtra,
cbWndExtra: w.CbWndExtra,
hInstance: w.HInstance,
hIcon: w.HIcon,
hCursor: w.HCursor,
hbrBackground: w.HbrBackground,
lpszMenuName: menuName,
lpszClassName: syscall.StringToUTF16Ptr(w.LpszClassName),
}
}
var (
registerClass = user32.NewProc("RegisterClassW")
)
func RegisterClass(lpWndClass *WNDCLASS) (class ATOM, err error) {
r1, _, err := registerClass.Call(uintptr(unsafe.Pointer(lpWndClass.toNative())))
if r1 == 0 { // failure
return 0, err
}
return ATOM(r1), nil
}
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