func NewSystemColorBrush(colorIndex int) (*SystemColorBrush, error) {
hBrush := win.GetSysColorBrush(colorIndex)
if hBrush == 0 {
return nil, newError("GetSysColorBrush failed")
}
return &SystemColorBrush{hBrush, colorIndex}, nil
}
func MyRegisterClass(hInstance win.HINSTANCE) (atom win.ATOM) {
var wc win.WNDCLASSEX
wc.CbSize = uint32(unsafe.Sizeof(wc))
wc.Style = win.CS_HREDRAW | win.CS_VREDRAW
wc.LpfnWndProc = syscall.NewCallback(WndProc)
wc.CbClsExtra = 0
wc.CbWndExtra = 0
wc.HInstance = hInstance
wc.HbrBackground = win.GetSysColorBrush(win.COLOR_WINDOWFRAME)
wc.LpszMenuName = syscall.StringToUTF16Ptr("")
wc.LpszClassName = syscall.StringToUTF16Ptr(wndClassName)
wc.HIconSm = win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_APPLICATION))
wc.HIcon = win.LoadIcon(0, win.MAKEINTRESOURCE(win.IDI_APPLICATION))
wc.HCursor = win.LoadCursor(0, win.MAKEINTRESOURCE(win.IDC_ARROW))
return win.RegisterClassEx(&wc)
}