golang怎么实现一个简单的窗口隐藏运行的应用程序？

实现一个简单的窗口隐藏运行的应用程序，需要使用golang的系统库和UI库。

代码实现步骤：

1. 导入必要的系统库和UI库

package main

import (
	"syscall"
	"time"

	"github.com/lxn/win"
)

2. 创建窗口并设置为隐藏

func createAndHideWindow() {
	//设置窗口位置及大小
	win.CreateWindowEx(0, syscall.StringToUTF16Ptr("Button"), nil,
		win.WS_VISIBLE|win.WS_POPUPWINDOW|win.WS_CAPTION|win.WS_SYSMENU,
		100, 100, 400, 300, 0, 0, 0, nil)

	//获取窗口句柄
	hwnd := win.FindWindow(nil, syscall.StringToUTF16Ptr("Button"))

	//设置窗口为隐藏
	win.ShowWindow(hwnd, win.SW_HIDE)
}

3. 设置程序在后台运行

func setToBackground() {
	hwnd := win.FindWindow(nil, syscall.StringToUTF16Ptr("Button"))
	
	//将程序放在后台运行
	_, foreThreadID := win.GetWindowThreadProcessId(win.GetForegroundWindow(), nil)
	thisThreadID := win.GetCurrentThreadId()
	win.AttachThreadInput(thisThreadID, foreThreadID, true)
	win.SetForegroundWindow(hwnd)
	win.AttachThreadInput(thisThreadID, foreThreadID, false)
	win.ShowWindow(hwnd, win.SW_HIDE)
}

4. 完整示例代码：

package main

import (
	"syscall"
	"time"

	"github.com/lxn/win"
)
func createAndHideWindow() {
	win.CreateWindowEx(0, syscall.StringToUTF16Ptr("Button"), nil,
		win.WS_VISIBLE|win.WS_POPUPWINDOW|win.WS_CAPTION|win.WS_SYSMENU,
		100, 100, 400, 300, 0, 0, 0, nil)

	hwnd := win.FindWindow(nil, syscall.StringToUTF16Ptr("Button"))

	win.ShowWindow(hwnd, win.SW_HIDE)
}

func setToBackground() {
	hwnd := win.FindWindow(nil, syscall.StringToUTF16Ptr("Button"))

	_, foreThreadID := win.GetWindowThreadProcessId(win.GetForegroundWindow(), nil)
	thisThreadID := win.GetCurrentThreadId()

	win.AttachThreadInput(thisThreadID, foreThreadID, true)
	win.SetForegroundWindow(hwnd)
	win.AttachThreadInput(thisThreadID, foreThreadID, false)
	win.ShowWindow(hwnd, win.SW_HIDE)
}

func main() {
	createAndHideWindow()
	setToBackground()

	//程序持续运行
	for {
		time.Sleep(1 * time.Second)
	}
}

以上代码实现了一个简单的窗口隐藏运行的应用程序，通过使用系统库和UI库，实现了在后台运行的效果。