[Winform]CefSharp ——js调用c#方法

雨点打透心脏的1/2处 2021-07-26 12:56 791阅读 1赞

### 摘要 ###

有时我们在winform中嵌入浏览器，需要在页面上读取电脑上的一些信息，这个时候就需要用到CefSharp的RegisterJsObject进行注册方法然后供js进行调用了。

### 一个例子 ###

我们在winform中嵌入的页面中，显示电脑的信息，电脑信息通过winform进行读取，js调用获取电脑信息的方法，并将最终结果以 [json][] 字符串的形式传递到js端，js获取到这些信息并在页面上进行显示。

定义一个专门处理js回调的类

/// <summary>
        /// js c#回调类
        /// </summary>
        class ScriptCallbackManager
        {
            /// <summary>
            /// 查找电脑信息
            /// </summary>
            /// <param name="javascriptCallback"></param>
            public void FindComputerInfo(IJavascriptCallback javascriptCallback)
            {
    
                Task.Factory.StartNew(async () =>
                {
    
                    using (javascriptCallback)
                    {
                        Computer computer = new Computer();
                        string response = JsonConvert.SerializeObject(new
                        {
                            cpu_id = computer.CPU_Id,
                            disk_id = computer.Disk_Id,
                            host_name = computer.HostName,
                            networkcard = computer.NetworkCard,
                            serialNumber = computer.SerialNumber_Manufacturer_Product.Item1,
                            manufacturer = computer.SerialNumber_Manufacturer_Product.Item2,
                            product = computer.SerialNumber_Manufacturer_Product.Item3,
                        });
                        await javascriptCallback.ExecuteAsync(response);
                    }
                });
    
            }
    
        }

其中computer类为获取电脑信息的操作类

/// <summary>
        /// 电脑信息类
        /// </summary>
        public class Computer
        {
            /// <summary>
            /// 查找cpu的id
            /// </summary>
            /// <returns></returns>
            public string CPU_Id
            {
                get
                {
                    try
                    {
                        string str = string.Empty;
                        ManagementClass mcCPU = new ManagementClass("win32_Processor");
                        ManagementObjectCollection mocCPU = mcCPU.GetInstances();
                        foreach (ManagementObject m in mocCPU)
                        {
                            str = m["Processorid"].ToString().Trim().Substring(0, 8);
                            break;
                        }
                        return str;
                    }
                    catch (Exception)
                    {
                        return string.Empty;
                    }
                }
            }
            public string Disk_Id
            {
                get
                {
                    try
                    {
                        string hdId = string.Empty;
                        ManagementClass hardDisk = new ManagementClass("win32_DiskDrive");
                        ManagementObjectCollection hardDiskC = hardDisk.GetInstances();
                        foreach (ManagementObject m in hardDiskC)
                        {
                            hdId = m.Properties["Model"].Value.ToString();//WDC WD800BB-56JKC0
                            break;
                        }
                        return hdId;
                    }
                    catch (Exception)
                    {
    
                        return string.Empty;
                    }
                }
            }
            /// <summary>
            /// 网卡
            /// </summary>
            public string NetworkCard
            {
                get
                {
                    try
                    {
                        string MoAddress = string.Empty;
                        ManagementClass networkAdapter = new ManagementClass("Win32_NetworkAdapterConfiguration");
                        ManagementObjectCollection adapterC = networkAdapter.GetInstances();
                        foreach (ManagementObject m in adapterC)
                        {
                            if ((bool)m["IPEnabled"] == true)
                            {
                                MoAddress = m["MacAddress"].ToString().Trim();
                                m.Dispose();
                            }
                        }
                        return MoAddress;
                    }
                    catch
                    {
                        return string.Empty;
                    }
                }
            }
            /// <summary>
            /// 获取序列号，制造商，型号
            /// </summary>
            public Tuple<string, string, string> SerialNumber_Manufacturer_Product
            {
                get
                {
                    try
                    {
                        Tuple<string, string, string> tuple = null; new Tuple<string, string, string>(string.Empty, 
    string.Empty, string.Empty);
                        ManagementObjectSearcher mos = new ManagementObjectSearcher("select * from Win32_baseboard");
    
    
                        foreach (ManagementObject m in mos.Get())
                        {
                            tuple = new Tuple<string, string, string>(m["SerialNumber"].ToString(), m["Manufacturer"].ToString(),
     m["Product"].ToString());
                        }
                        return tuple;
                    }
                    catch (Exception)
                    {
    
                        return null;
                    }
                }
            }
            /// <summary>
            /// 计算机名称
            /// </summary>
            public string HostName
            {
                get
                {
                    return System.Net.Dns.GetHostName();
                }
            }
        }

嵌入的页面

<!DOCTYPE html>
    
    <html lang="en" xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta charset="utf-8" />
        <title></title>
        <script src="js/jquery.min.js"></script>
        <script>
    
            //设置电脑信息
            function callback(data) {
                data = JSON.parse(data);
                $("#msg").html('');
                $("#msg")
                .append($("<li>cpu_id:" + data.cpu_id + "</li>"))
                .append($("<li>disk_id:" + data.disk_id + "</li>"))
                .append($("<li>host_name:" + data.host_name + "</li>"))
                .append($("<li>networkcard:" + data.networkcard + "</li>"))
                .append($("<li>serialNumber:" + data.serialNumber + "</li>"))
                .append($("<li>manufacturer:" + data.manufacturer + "</li>"))
                .append($("<li>product:" + data.product + "</li>"));
            };
            function findComputerInfo() {
                //调用后台C#FindComputerInfo，返回结果回调方法callback
                googleBrower.FindComputerInfo(callback);
            };
        </script>
    </head>
    <body>
        <button onclick="findComputerInfo()">获取电脑信息</button>
        <ul id="msg"></ul>
    </body>
    </html>

单击按钮，在页面上显示当前电脑信息

窗体代码

/// <summary>
        /// 主窗体
        /// </summary>
        public partial class MainFrm : Form
        {
            private CefSharp.CefSettings _settings;
            CefSharp.WinForms.ChromiumWebBrowser _webView;
            public MainFrm()
            {
                InitializeComponent();
                _settings = new CefSharp.CefSettings();
                CefSharp.Cef.Initialize(_settings);
                this.FormClosed += MainFrm_FormClosed;
            }
    
            void MainFrm_FormClosed(object sender, FormClosedEventArgs e)
            {
                if (_webView != null)
                {
                    _webView.Dispose();
                }
            }
    
            private void MainFrm_Load(object sender, EventArgs e)
            {
                this.WindowState = FormWindowState.Maximized;
                string url = "file:///E:/xxx/bin/x64/Debug/lenovo/test.html";
                LoadPage(url);
                
            }
            /// <summary>
            /// 加载页面
            /// </summary>
            /// <param name="url"></param>
            private void LoadPage(string url)
            {
                if (_webView == null)
                {
                    _webView = new CefSharp.WinForms.ChromiumWebBrowser(url);
                    _webView.Dock = DockStyle.Fill;
                    _webView.LifeSpanHandler = new OpenPageSelf();
                    _webView.RegisterJsObject("googleBrower", new ScriptCallbackManager(), 
    new CefSharp.BindingOptions { CamelCaseJavascriptNames = false });
                    this.Controls.Add(_webView);
                }
                else
                {
                    _webView.Load(url);
                }
            }
        }

测试

![6ad7be77386a142d1962741469e43891.png][]

### 总结 ###

通过在winform嵌入浏览器，可以很方便处理h5页面的展示，不用再使用winform再开发一个客户端的程序，完全可以嵌入要开发的h5应用，这样完全应用了h5的特点，可以在电脑端，移动端访问，而不是每个终端都写代码。

[json]: http://www.codercto.com/category/json.html
[6ad7be77386a142d1962741469e43891.png]: /images/20210726/fed255784f6d44a499fe646bc78b5ae9.png