golang 开发gui

可能因为我电脑上的mingw下只有gcc,没有g++的原因，之前用walk和andlabs都不成功

最后用github上gxui的sample代码终于编译出来一个丑陋的GUI，但编译过程也提示了一堆类似以下内容的东东：

note: expected 'LPCWSTR {aka const short unsigned int *}' but argument is of type 'CHAR * {aka char *}'
 WINUSERAPI HANDLE WINAPI LoadImageW (HINSTANCE, LPCWSTR, UINT, int, int, UINT);

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main
 
import (
    "time"

    "github.com/google/gxui"
    "github.com/google/gxui/drivers/gl"
    "github.com/google/gxui/gxfont"
    "github.com/google/gxui/math"
    "github.com/google/gxui/samples/flags"
)

func appMain(driver gxui.Driver) {
    theme := flags.CreateTheme(driver)

    font, err := driver.CreateFont(gxfont.Default, 75)
    if err != nil {
        panic(err)
    }

    window := theme.CreateWindow(380, 100, "Hi")
    window.SetBackgroundBrush(gxui.CreateBrush(gxui.Gray50))

    label := theme.CreateLabel()
    label.SetFont(font)
    label.SetText("Hello world")

    window.AddChild(label)

    ticker := time.NewTicker(time.Millisecond * 30)
    go func() {
        phase := float32(0)
        for _ = range ticker.C {
            c := gxui.Color{
                R: 0.75 + 0.25*math.Cosf((phase+0.000)*math.TwoPi),
                G: 0.75 + 0.25*math.Cosf((phase+0.333)*math.TwoPi),
                B: 0.75 + 0.25*math.Cosf((phase+0.666)*math.TwoPi),
                A: 0.50 + 0.50*math.Cosf(phase*10),
            }
            phase += 0.01
            driver.Call(func() {
                label.SetColor(c)
            })
        }
    }()

    window.OnClose(ticker.Stop)
    window.OnClose(driver.Terminate)
}

func main() {
    gl.StartDriver(appMain)
}