Fixed the wndproc not responding: turns out I have to have message dispatch in the UI thread...

uitask_windows.go

@@ -28,14 +28,35 @@ func ui(initDone chan error) {
 	uitask = make(chan *uimsg)
 	initDone <- doWindowsInit()
 
-	go msgloop()
+//	go msgloop()
+	var msg struct {
+		Hwnd	_HWND
+		Message	uint32
+		WParam	_WPARAM
+		LParam	_LPARAM
+		Time		uint32
+		Pt		_POINT
+	}
+	var _peekMessage = user32.NewProc("PeekMessageW")
+	const _PM_REMOVE = 0x0001
 
-	for m := range uitask {
+	for {
+		select {
+		case m := <-uitask:
 			r1, _, err := m.call.Call(m.p...)
 			m.ret <- uiret{
 				ret:	r1,
 				err:	err,
 			}
+		default:
+			// TODO figure out how to handle errors
+			_peekMessage.Call(
+				uintptr(unsafe.Pointer(&msg)),
+				uintptr(_NULL),
+				0,
+				0,
+				uintptr(_PM_REMOVE))
+		}
 	}
 }