用Go写一个小型客户端

1、安装lxn/walk

go get github.com/lxn/walk

2、创建test.go文件

package main

import (
	"github.com/lxn/walk"
	. "github.com/lxn/walk/declarative"
	"strings"
)

func main() {
	var inTE, outTE *walk.TextEdit

	MainWindow{
		Title:   "SCREAMO",
		MinSize: Size{600, 400},
		Layout:  VBox{},
		Children: []Widget{
			HSplitter{
				Children: []Widget{
					TextEdit{AssignTo: &inTE},
					TextEdit{AssignTo: &outTE, ReadOnly: true},
				},
			},
			PushButton{
				Text: "SCREAM",
				OnClicked: func() {
					outTE.SetText(strings.ToUpper(inTE.Text()))
				},
			},
		},
	}.Run()
}

3、创建系统支持文件test.manifest

<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
    <assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="SomeFunkyNameHere" type="win32"/>
    <dependency>
        <dependentAssembly>
            <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
        dependentAssembly>
    dependency>
    <application xmlns="urn:schemas-microsoft-com:asm.v3">
        <windowsSettings>
            <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitordpiAwareness>
            <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">TruedpiAware>
        windowsSettings>
    application>
assembly>

4 、生成rsrc.syso文件

go get github.com/akavel/rsrc
rsrc -manifest test.manifest -o rsrc.syso

5、只运行，不打包

go build

6、打包

go build -ldflags="-H windowsgui"

-----------------END----------------------

7、小工具

1、弹出框
     walk.MsgBox(mw, "info", "警告信息", walk.MsgBoxIconInformation)
2、利用cmd调用默认浏览器打开链接
     cmd := exec.Command(`cmd`, `/c`, `start`,arr["url"].(string))
     cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}  //隐藏cmd窗口
3、修改打开软件显示位置
	xScreen := win.GetSystemMetrics(win.SM_CXSCREEN)
	yScreen := win.GetSystemMetrics(win.SM_CYSCREEN)
	win.SetWindowPos(
		mw.Handle(),
		0,
		(xScreen - SIZE_W)/2,
		(yScreen - SIZE_H)/2,
		SIZE_W,
		SIZE_H,
		win.SWP_FRAMECHANGED,
	)

8、完整案例

package main

import (
	"github.com/lxn/walk"
	. "github.com/lxn/walk/declarative"
	"log"
	"github.com/lxn/win"
	"syscall"
	"net"
	"net/http"
	"strings"
	"io/ioutil"
	"encoding/json"
	"os/exec"
)
const (
	SIZE_W = 570
	SIZE_H = 380
)

var (
	libuser32 *syscall.DLL
	isIconic  *syscall.Proc
)

func init() {
	libuser32 = syscall.MustLoadDLL("user32.dll")
	isIconic = libuser32.MustFindProc("IsIconic")
}

func IsIconic(hWnd win.HWND) bool {
	ret, _, _ := isIconic.Call(uintptr(hWnd))
	return ret == win.TRUE
}

type MyWindow struct {
	*walk.MainWindow
}

func main() {
	mw := new(MyWindow)
	var username, password *walk.LineEdit
	if err := (MainWindow{
		AssignTo: &mw.MainWindow,
		Title:    "WitMooni",
		MinSize: Size{50, 50},
		MaxSize: Size{50, 50},
		Size: Size{Width: 300, Height: 150},
		Layout:   VBox{},
		Children: []Widget{
			VSplitter{
				Children: []Widget{
					Label{
						Text:"Имя Клиента",
					},
					LineEdit{
						Text:"",
						AssignTo: &username,
					},
					Label{
						Text:"пароль",
					},
					LineEdit{
						Text:"",
						AssignTo: &password,
					},
					},
			},
			PushButton{
				Text: "Нужно войти",
				OnClicked: func() {
					var username= username.Text()
					var password= password.Text()
					if username == "" {
						walk.MsgBox(mw, "предостережение", "Счёт не может быть пустым", walk.MsgBoxIconInformation)
						return
					}
					if password == "" {
						walk.MsgBox(mw, "предостережение", "Пароль не может быть пустым", walk.MsgBoxIconInformation)
						return
					}
					macAdd := ""
					interfaces, _ := net.Interfaces()
					for _, inter := range interfaces {
						mac := inter.HardwareAddr
						if mac.String() != "" {
							if (mac.String() != "") {
								mac := mac.String()
								macAdd = mac
							}
						}
					}
					client := &http.Client{}
					req, _ := http.NewRequest("POST", "http://www.****.com/user/login/*****",
						strings.NewReader("username="+username+"&password="+password+"&mac="+macAdd))
					req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
					req.Header.Set("Cookie", "liubaonanha=anny")
					resp, _ := client.Do(req)
					defer resp.Body.Close()
					body, _ := ioutil.ReadAll(resp.Body)
					res := string(body)
					str := []byte(res)
					arr := make(map[string]interface{})
					json.Unmarshal(str, &arr)
					_, ok := arr["url"]
					if (ok) {
						//exec.Command(`cmd`, `/c`, `start`, arr["url"].(string)).Start()
						cmd := exec.Command(`cmd`, `/c`, `start`,arr["url"].(string))
						cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}  //隐藏cmd窗口
						cmd.Start()
						mw.Close()
					} else {
						walk.MsgBox(mw, "предостережение", arr["message"].(string), walk.MsgBoxIconInformation)
					}
				},
			},

		},
	}).Create(); err != nil {
		log.Fatal(err)
	}
	mw.SizeChanged().Attach(func() {
	})

	xScreen := win.GetSystemMetrics(win.SM_CXSCREEN)
	yScreen := win.GetSystemMetrics(win.SM_CYSCREEN)
	win.SetWindowPos(
		mw.Handle(),
		0,
		(xScreen - SIZE_W)/2,
		(yScreen - SIZE_H)/2,
		SIZE_W,
		SIZE_H,
		win.SWP_FRAMECHANGED,
	)
	win.ShowWindow(mw.Handle(), win.SW_SHOW)
	mw.Run()

}