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