(see previous commit; part 2)

1 files changed, 78 insertions, 0 deletions

diff --git a/stdwndclass_windows.go b/stdwndclass_windows.go
new file mode 100644
index 0000000..e6796e5
--- /dev/null
+++ b/stdwndclass_windows.go
@@ -0,0 +1,78 @@
+// 8 february 2014
+package main
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	stdWndClass = "gouiwndclass"
+)
+
+var (
+	defWindowProc = user32.NewProc("DefWindowProcW")
+)
+
+func stdWndProc(hwnd _HWND, uMsg uint32, wParam _WPARAM, lParam _LPARAM) _LRESULT {
+	// TODO get CreateWindowEx data
+	switch uMsg {
+	default:
+		r1, _, _ := defWindowProc.Call(
+			uintptr(hwnd),
+			uintptr(uMsg),
+			uintptr(wParam),
+			uintptr(lParam))
+		return LRESULT(r1)
+	}
+	panic(fmt.Sprintf("stdWndProc message %d did not return: internal bug in ui library", uMsg))
+}
+
+type _WNDCLASS struct {
+	style				uint32
+	lpfnWndProc		uintptr
+	cbClsExtra		int
+	cbWndExtra		int
+	hInstance			_HANDLE
+	hIcon			_HANDLE
+	hCursor			_HANDLE
+	hbrBackground	_HBRUSH
+	lpszMenuName	*uint16
+	lpszClassName		*uint16
+}
+
+func registerStdWndClass() (err error) {
+	const (
+		_IDI_APPLICATION = 32512
+		_IDC_ARROW = 32512
+	)
+
+	icon, err := user32.NewProc("LoadIconW").Call(
+		uintptr(_NULL),
+		uintptr(_IDI_APPLICATION))
+	if err != nil {
+		return fmt.Errorf("error getting window icon: %v", err)
+	}
+	cursor, err := user32.NewProc("LoadCursorW").Call(
+		uintptr(_NULL),
+		uintptr(_IDC_ARROW))
+	if err != nil {
+		return fmt.Errorf("error getting window cursor: %v", err)
+	}
+
+	wc := &_WNDCLASS{
+		lpszClassName:	syscall.StringToUTF16Ptr(stdWndClass),
+		lpfnWndProc:		syscall.NewCallback(stdWndProc),
+		hInstance:		hInstance,
+		hIcon:			icon,
+		hCursor:			cursor,
+		hbrBackground:	_HBRUSH(_COLOR_BTNFACE + 1),
+	}
+
+	r1, _, err := user32.NewProc("RegisterClassW").Call(uintptr(unsafe.Pointer(wc)))
+	if r1 == 0 {		// failure
+		return fmt.Errorf("error registering class: %v", err)
+	}
+	return nil
+}