C# and WUAPI: BeginDownload function
本文关键字：BeginDownload function WUAPI and | 更新日期: 2023-09-27 18:17:06
首先，我没有面向对象编程的经验。我在学校里创建了一些VB脚本和Java，但仅此而已。所以我的问题很可能就在那里。不过，在过去的几天里，我一直在尝试组装一个小应用程序，让我可以扫描、选择和安装Windows更新。到目前为止，我已经能够理解大多数参考资料，并在互联网上的一些帖子的帮助下，我现在可以选择和下载更新了。
到目前为止，我已经能够使用以下代码下载一系列更新：
UpdateCollection CurrentInstallCollection = (UpdateCollection)e.Argument;
UpdateDownloader CurrentDownloader = CurrentSession.CreateUpdateDownloader();
CurrentDownloader.Updates = CurrentInstallCollection;
这是在后台工作程序中运行的，并在下载完成后返回。它运行得很好，我可以看到更新在文件系统上下载，但实际上没有办法在应用程序中显示进度。为了做到这一点，有一个IDownloadJob接口，它允许我使用下载程序的.BeginDownload方法。
至少我认为UpdateSession.CreateUpdateDownloader。问题来了：我已经尝试了大约6个小时来让代码正常工作，但无论我做了什么，都没有成功。此外，互联网上没有太多关于.BeginDownload方法的信息(或者至少看起来是这样(，但我对该方法的调用不起作用：
IDownloadJob CurrentDownloadJob = CurrentDownloader.BeginDownload();
我不知道该提供什么论据。我尝试过方法、对象。。。但无济于事。完整的代码块如下所示：
UpdateCollection CurrentInstallCollection = (UpdateCollection)e.Argument;
UpdateDownloader CurrentDownloader = CurrentSession.CreateUpdateDownloader();
CurrentDownloader.Updates = CurrentInstallCollection;
IDownloadJob CurrentDownloadJob = CurrentDownloader.BeginDownload();
IDownloadProgress CurrentJobProgess = CurrentDownloadJob.GetProgress();
tbStatus.Text = Convert.ToString(CurrentJobProgess.PercentComplete);
我在互联网上找到了一个用.BeginDownload(this, this, this)调用该方法的源，它不会在代码编辑器中报告任何错误，但可能无助于报告，因为据我所知，提供的参数是在所描述的事件发生时调用的方法(进度已更改或下载已完成(。
我也试过这个，但也没用：
http://social.msdn.microsoft.com/Forums/en/csharpgeneral/thread/636a8399-2bc1-46ff-94df-a58cebfe688c
BeginDownload方法的详细描述：
http://msdn.microsoft.com/en-us/library/aa386132(v=VS.85(.aspx
WUAPI参考：
不幸的是，我不被允许发布链接，但指向BeginDownload方法的链接指向同一个地方。
我知道，这是一个很难问的问题，但如果有人能给我指明正确的方向(比如通过哪些论点以及如何通过(，我将不胜感激。
Windows Update API(WU API Lib(WUApiLib((在我看来没有得到很好的记录。异步"；开始"；搜索、下载和安装的所有任务如下所示。它很难理解，不幸的是，微软在这个阶段没有给出任何C#代码示例。我希望我能帮助我的小应用程序。代码可以稍微整理一下，在这个阶段它只是被黑客攻击在一起，但它达到了目的。你需要一个有四个组件的Windows窗体：
private System.Windows.Forms.TextBox textBox1;
private System.ComponentModel.BackgroundWorker EnableServicesWorker;
private System.Windows.Forms.Label toolStripStatusLabel2;
private System.Windows.Forms.Label toolStripStatusLabel1;
我的代码实现了从微软网站搜索、下载和安装更新的所有异步属性(抱歉太长了(：
using System;
using WUApiLib;
using System.Data;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.ComponentModel;
using System.ServiceProcess;
using System.Collections.Generic;
namespace Windows_Update_Automation
{
public partial class Form1 : Form
{
public UpdateSession UpdateSession;
#region <------- Search Section ------->
public IUpdateSearcher iUpdateSearcher;
public ISearchJob iSearchJob;
public UpdateCollection NewUpdatesCollection;
public ISearchResult NewUpdatesSearchResult;
#endregion <------- Search Section ------->
#region <------- Downloader Section ------->
public IUpdateDownloader iUpdateDownloader;
public IDownloadJob iDownloadJob;
public IDownloadResult iDownloadResult;
#endregion <------- Downloader Section ------->
#region <------- Installer Section ------->
public IUpdateInstaller iUpdateInstaller;
public IInstallationJob iInstallationJob;
public IInstallationResult iInstallationResult;
#endregion <------- Installer Section ------->
// Declare a Delegate Type for Message Notification...
public delegate void SendNotification();
// Create an Instance of Delegate Type...
public SendNotification sendNotification;
private int count = 0;
public int Count
{
get { return count; }
set { count = value; }
}
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// Show - or Hide...
this.Show();
// Encapsulate the setTextBox1 Method in Delegate SendNotification...
sendNotification = new SendNotification(setTextBox1);
// Set Text Box Value...
this.toolStripStatusLabel1.Text = "Enabling Update Services...";
// Set Text Box Value...
this.toolStripStatusLabel2.Text = "";
// Lets check Windows is up to that task...
EnableServicesWorker.RunWorkerAsync();
}
private void EnableServicesWorker_DoWork(object sender, DoWorkEventArgs e)
{
// Get Services Collection...
ServiceController[] serviceController;
serviceController = ServiceController.GetServices();
// Loop through and check for a particular Service...
foreach (ServiceController scTemp in serviceController)
{
switch (scTemp.DisplayName)
{
case "Windows Update":
RestartService(scTemp.DisplayName, 5000);
break;
case "Automatic Updates":
RestartService(scTemp.DisplayName, 5000);
break;
default:
break;
}
}
// Check for iAutomaticUpdates.ServiceEnabled...
IAutomaticUpdates iAutomaticUpdates = new AutomaticUpdates();
if (!iAutomaticUpdates.ServiceEnabled)
{
iAutomaticUpdates.EnableService();
}
}
private void EnableServicesWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
this.toolStripStatusLabel1.Text = "Searching for updates...";
iUpdateSearch();
}
public static void RestartService(string serviceName, int timeoutMilliseconds)
{
ServiceController serviceController = new ServiceController(serviceName);
try
{
int millisec1 = Environment.TickCount;
TimeSpan timeout = TimeSpan.FromMilliseconds(timeoutMilliseconds);
serviceController.Stop();
serviceController.WaitForStatus(ServiceControllerStatus.Stopped, timeout);
// count the rest of the timeout
int millisec2 = Environment.TickCount;
timeout = TimeSpan.FromMilliseconds(timeoutMilliseconds - (millisec2 - millisec1));
serviceController.Start();
serviceController.WaitForStatus(ServiceControllerStatus.Running, timeout);
}
catch
{
// ...
}
}
#region <------- Search Methods ------->
private void iUpdateSearch()
{
UpdateSession = new UpdateSession();
iUpdateSearcher = UpdateSession.CreateUpdateSearcher();
// Only Check Online..
iUpdateSearcher.Online = true;
// Begin Asynchronous IUpdateSearcher...
iSearchJob = iUpdateSearcher.BeginSearch("IsInstalled=0 AND IsPresent=0", new iUpdateSearcher_onCompleted(this), new iUpdateSearcher_state(this));
}
private void iUpdateSearchComplete(Form1 mainform)
{
Form1 formRef = mainform;
// Declare a new UpdateCollection and populate the result...
NewUpdatesCollection = new UpdateCollection();
NewUpdatesSearchResult = iUpdateSearcher.EndSearch(iSearchJob);
Count = NewUpdatesSearchResult.Updates.Count;
formRef.Invoke(formRef.sendNotification);
// Accept Eula code for each update
for (int i = 0; i < NewUpdatesSearchResult.Updates.Count; i++)
{
IUpdate iUpdate = NewUpdatesSearchResult.Updates[i];
if (iUpdate.EulaAccepted == false)
{
iUpdate.AcceptEula();
}
NewUpdatesCollection.Add(iUpdate);
}
foreach (IUpdate update in NewUpdatesSearchResult.Updates)
{
textBox1.AppendText(update.Title + Environment.NewLine);
}
if (NewUpdatesSearchResult.Updates.Count > 0)
{
iUpdateDownload();
}
}
#endregion <------- Search Methods ------->
#region <------- Downloader Methods ------->
private void iUpdateDownload()
{
UpdateSession = new UpdateSession();
iUpdateDownloader = UpdateSession.CreateUpdateDownloader();
iUpdateDownloader.Updates = NewUpdatesCollection;
iUpdateDownloader.Priority = DownloadPriority.dpHigh;
iDownloadJob = iUpdateDownloader.BeginDownload(new iUpdateDownloader_onProgressChanged(this), new iUpdateDownloader_onCompleted(this), new iUpdateDownloader_state(this));
}
public void iDownloadComplete()
{
iDownloadResult = iUpdateDownloader.EndDownload(iDownloadJob);
if (iDownloadResult.ResultCode == OperationResultCode.orcSucceeded)
{
this.toolStripStatusLabel1.Text = "Installing Updates...";
iInstallation();
}
else
{
string message = "The Download has failed: " + iDownloadResult.ResultCode + ". Please check your internet connection then Re-Start the application.";
string caption = "Download Failed!";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBoxIcon icon = MessageBoxIcon.Error;
MessageBox.Show(message, caption, buttons, icon);
Application.Exit();
}
}
#endregion <------- Downloader Methods ------->
#region <------- Installation Methods ------->
public void iInstallation()
{
iUpdateInstaller = UpdateSession.CreateUpdateInstaller() as IUpdateInstaller;
iUpdateInstaller.Updates = this.NewUpdatesCollection;
iInstallationJob = iUpdateInstaller.BeginInstall(new iUpdateInstaller_onProgressChanged(this), new iUpdateInstaller_onCompleted(this), new iUpdateInstaller_state(this));
}
public void iInstallationComplete()
{
iInstallationResult = iUpdateInstaller.EndInstall(iInstallationJob);
if (iInstallationResult.ResultCode == OperationResultCode.orcSucceeded)
{
this.toolStripStatusLabel1.Text = "Installation Complete...";
}
else
{
string message = "The Installation has failed: " + iInstallationResult.ResultCode + ".";
string caption = "DownInstallationload Failed!";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBoxIcon icon = MessageBoxIcon.Error;
MessageBox.Show(message, caption, buttons, icon);
Application.Exit();
}
}
#endregion <------- Installation Methods ------->
#region <------- Notification Methods ------->
public void setTextBox1()
{
toolStripStatusLabel1.Text = Count + " Updates found...";
}
public void setTextBox1Notification(string txt)
{
toolStripStatusLabel1.Text = txt;
}
public void setTextBox2Notification(string txt)
{
toolStripStatusLabel2.Text = txt;
}
#endregion <------- Notification Methods ------->
#region <------- iUpdateSearcher.BeginDownload Object Abstract Class's ------->
// onCompleted [in]
// An ISearchCompletedCallback interface that is called when an asynchronous search operation is complete.
public class iUpdateSearcher_onCompleted : ISearchCompletedCallback
{
private Form1 form1;
public iUpdateSearcher_onCompleted(Form1 mainForm)
{
this.form1 = mainForm;
}
// Implementation of IDownloadCompletedCallback interface...
public void Invoke(ISearchJob searchJob, ISearchCompletedCallbackArgs e)
{
form1.iUpdateSearchComplete(this.form1);
}
}
// state [in]
// The caller-specific state that is returned by the AsyncState property of the ISearchJob interface.
public class iUpdateSearcher_state
{
private Form1 form1;
// Implementation of state interface...
public iUpdateSearcher_state(Form1 mainForm)
{
this.form1 = mainForm;
form1.setTextBox2Notification("State: Search Started...");
}
}
#endregion <------- iUpdateSearcher.BeginDownload Object Abstract Class's ------->
#region <------- iUpdateDownloader.BeginDownload Object Abstract Class's ------->
// onProgressChanged [in]
// An IDownloadProgressChangedCallback interface that is called periodically for download progress changes before download is complete.
public class iUpdateDownloader_onProgressChanged : IDownloadProgressChangedCallback
{
private Form1 form1;
public iUpdateDownloader_onProgressChanged(Form1 mainForm)
{
this.form1 = mainForm;
}
// Implementation of IDownloadProgressChangedCallback interface...
public void Invoke(IDownloadJob downloadJob, IDownloadProgressChangedCallbackArgs e)
{
decimal bDownloaded = ((e.Progress.TotalBytesDownloaded / 1024) / 1024);
decimal bToDownloaded = ((e.Progress.TotalBytesToDownload / 1024) / 1024);
bDownloaded = decimal.Round(bDownloaded, 2);
bToDownloaded = decimal.Round(bToDownloaded, 2);
form1.setTextBox1Notification("Downloading Update: "
+ e.Progress.CurrentUpdateIndex
+ "/"
+ downloadJob.Updates.Count
+ " - "
+ bDownloaded + "Mb"
+ " / "
+ bToDownloaded + "Mb");
}
}
// onCompleted [in]
// An IDownloadCompletedCallback interface (C++/COM) that is called when an asynchronous download operation is complete.
public class iUpdateDownloader_onCompleted : IDownloadCompletedCallback
{
private Form1 form1;
public iUpdateDownloader_onCompleted(Form1 mainForm)
{
this.form1 = mainForm;
}
// Implementation of IDownloadCompletedCallback interface...
public void Invoke(IDownloadJob downloadJob, IDownloadCompletedCallbackArgs e)
{
form1.iDownloadComplete();
}
}
// state [in]
// The caller-specific state that the AsyncState property of the IDownloadJob interface returns.
// A caller may use this parameter to attach a value to the download job object.
// This allows the caller to retrieve custom information about that download job object at a later time.
public class iUpdateDownloader_state
{
private Form1 form1;
// Implementation of state interface...
public iUpdateDownloader_state(Form1 mainForm)
{
this.form1 = mainForm;
form1.setTextBox2Notification("State: Download Started...");
}
}
#endregion <------- iUpdateDownloader.BeginDownload Objects ------->
#region <------- iUpdateInstaller.BeginInstall Object Abstract Class's ------->
// onProgressChanged [in]
// An IDownloadProgressChangedCallback interface that is called periodically for download progress changes before download is complete.
public class iUpdateInstaller_onProgressChanged : IInstallationProgressChangedCallback
{
private Form1 form1;
public iUpdateInstaller_onProgressChanged(Form1 mainForm)
{
this.form1 = mainForm;
}
// Implementation of IDownloadProgressChangedCallback interface...
public void Invoke(IInstallationJob iInstallationJob, IInstallationProgressChangedCallbackArgs e)
{
form1.setTextBox1Notification("Installing Update: "
+ e.Progress.CurrentUpdateIndex
+ " / "
+ iInstallationJob.Updates.Count
+ " - "
+ e.Progress.CurrentUpdatePercentComplete + "% Complete");
}
}
// onCompleted [in]
// An IDownloadCompletedCallback interface (C++/COM) that is called when an asynchronous download operation is complete.
public class iUpdateInstaller_onCompleted : IInstallationCompletedCallback
{
private Form1 form1;
public iUpdateInstaller_onCompleted(Form1 mainForm)
{
this.form1 = mainForm;
}
// Implementation of IDownloadCompletedCallback interface...
public void Invoke(IInstallationJob iInstallationJob, IInstallationCompletedCallbackArgs e)
{
form1.iInstallationComplete();
}
}
// state [in]
// The caller-specific state that the AsyncState property of the IDownloadJob interface returns.
// A caller may use this parameter to attach a value to the download job object.
// This allows the caller to retrieve custom information about that download job object at a later time.
public class iUpdateInstaller_state
{
private Form1 form1;
// Implementation of state interface...
public iUpdateInstaller_state(Form1 mainForm)
{
this.form1 = mainForm;
form1.setTextBox2Notification("State: Installation Started...");
}
}
#endregion <------- iUpdateInstaller.BeginInstall Objects ------->
添加对WUApiLib 的引用
public UpdateSession updateSession;
public ISearchResult searchResult;
private void Form1_Load(object sender, EventArgs e)
{
//check for updates
updateSession = new UpdateSession();
searchResult = updateSession.CreateUpdateSearcher().Search("IsInstalled=0 and Type='Software' and IsHidden=0");
//download updates
UpdateDownloader downloader = updateSession.CreateUpdateDownloader();
downloader.Updates = searchResult.Updates;
downloader.Download();
//collect all downloaded updates
UpdateCollection updatesToInstall = new UpdateCollection();
foreach (IUpdate update in searchResult.Updates)
{
if (update.IsDownloaded)
{
updatesToInstall.Add(update);
}
}
//install downloaded updates
IUpdateInstaller installer = updateSession.CreateUpdateInstaller();
installer.Updates = updatesToInstall;
IInstallationResult installationRes = installer.Install();
}