问题描述
我启动应用程序时的错误：
System.Net.WebException: Exception during request WebClient. ---> System.UnauthorizedAccessException: Access denied: "C:\Users\pwlam\Desktop\launcher\Loader-master\Loader\LoadeRel\bin\Debug".
в System.IO.__Error.WinIOError(Int32 errorCode,String maybeFullPath)
в System.IO.FileStream.Init(String path,FileMode mode,FileAccess access,Int32 rights,Boolean useRights,FileShare share,Int32 bufferSize,FileOptions options,Security_ATTRIBUTES secAttrs,String msgPath,Boolean bFromProxy,Boolean useLongPath,Boolean checkHost)
в System.IO.FileStream..ctor(String path,FileAccess access)
в System.Net.WebClient.DownloadFile(Uri address,String fileName)
--- End of trace of the internal exception stack ---
в System.Net.WebClient.DownloadFile(Uri address,String fileName)
в System.Net.WebClient.DownloadFile(String address,String fileName)
в Launcher.update.timer1_Tick(Object sender,EventArgs e) в C:\Users\pwlam\Desktop\launcher\Loader-master\Loader\LoadeRel\update.line:77
в System.Windows.Forms.Timer.OnTick(EventArgs e)
в System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
в System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd,Int32 msg,IntPtr wparam,IntPtr lparam)
update.cs：
// uses the the System namespace
using System;
// uses the System.Windows.Forms namespace
using System.Windows.Forms;
// uses the System.Net namespace
using System.Net;
// uses the System.Threading namespace
using System.Threading;
//(The using comments were given by Peatreat)
namespace Launcher
//Open brackets
{
public partial class update : MetroFramework.Forms.MetroForm
//Open brackets
{
public update()
//Open brackets
{
InitializeComponent(); //Kys
//Close brackets
}
string versioncheck = new WebClient().DownloadString(settings.Check); //Gets the value of your version.txt and saves it as a string named versioncheck
string location = System.IO.Path.GetDirectoryName(Application.ExecutablePath); //Gets the current dir/location of the loader and saves it as a string named location
private void update_Load(object sender,EventArgs e) //The code that is executed as soon as u open this form up
//Open brackets
{
metroLabel1.Text = "Loading."; //Changes the label to say "Loading."
//Thread.Sleep means it will take a quick nap
//Note: every 1000 = 1 second
Thread.Sleep(100);
metroLabel1.Text = "Loading.."; //Changes the label to say "Loading.."
Thread.Sleep(100); //Thread.Sleep means it will take a quick nap
metroLabel1.Text = "Loading..."; //Changes the label to say "Loading..."
Thread.Sleep(100); //Thread.Sleep means it will take a quick nap
metroLabel1.Text = "Loading."; //Changes the label to say "Loading."
Thread.Sleep(100); //Thread.Sleep means it will take a quick nap
metroLabel1.Text = "Loading.."; //Changes the label to say "Loading.."
Thread.Sleep(100); //Thread.Sleep means it will take a quick nap
metroLabel1.Text = "Loading..."; //Changes the label to say "Loading..."
Thread.Sleep(100); //Thread.Sleep means it will take a quick nap
metroLabel1.Text = "Checking for update"; //Changes the label to say "Checking for update"
//End of animation
if (versioncheck != settings.version.ToString()) //Checks if url string is not equal to string in memory. -Peatreat
//Open brackets
{
timer1.Start(); //Starts timer1 so look at the code down below
//Close brackets
}
else //If its not equal:
//Open brackets
{
timer2.Start(); //Starts timer2 so look at the code down below
//Close brackets
}
//Close brackets
}
private void timer1_Tick(object sender,EventArgs e) //This is timer1 and if it was activated,well... code is below,this is self explanitory so kys
//Open brackets
{
metroLabel1.Text = "Update found!"; //Changes the label to say "Update found!"
Thread.Sleep(100);//Thread.Sleep means it will take a quick nap
metroLabel1.Text = "Downloading"; //Changes the label to say "Downloading"
WebClient webClient = new WebClient(); //The thing used to connect to the worst place in the world...! The INTERNET!!! *DUN DUN DUNNNNNNN*
webClient.DownloadFile(settings.Update,location); //Code to download "your" loader
metroLabel1.Text = "Done!"; //Changes the label to say "Done!"
Application.Exit(); //Close the loader after it downloaded the new loader
timer1.Stop(); //Stops the timer so this code ends and does not repeat. If you dont undertstand this,comment out this entire line and find out.
//Close brackets
}
private void timer2_Tick(object sender,EventArgs e)
//Open brackets
{
metroLabel1.Text = "No update found :)"; //Changes the label to say "No update found :)"
Thread.Sleep(1000); //Thread.Sleep means it will take a quick nap for 1 sec (Litterly)
//---------------------------------------------------------------------------------------
//All this does is just closes this form and opens form2. so lemme break it down:
//Makes a variable called form2 which equals to open form2
var form1 = new Main();
//Overall its just a tricky way to not have to declare an entire function (event handler)
//outside of the current one that handles Form2.Closed event. – KDecker
//Also note: I didnt really kNow how to explain this but this guy did a good job!
form1.Closed += (s,args) => this.Close();
//This shows form2
form1.Show();
//This closes/hides this form
this.Hide();
//---------------------------------------------------------------------------------------
timer2.Stop();//Stops the timer so this code ends and does not repeat. If you dont undertstand this,comment out this entire line and find out.
//Close brackets
}
//Close brackets
}
//Close brackets
}
和这个用户代理
public static string UserAgentString = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/46.0.2490.33 Safari/537.36";
有人可以向我展示一些例子或指出正确的方向吗？
感谢您的帮助。
解决方法
您将 location 变量设置为目录名称
string location = System.IO.Path.GetDirectoryName(Application.ExecutablePath);
然后您尝试将 HTTP 请求中的流写入该目录
webClient.DownloadFile(settings.Update,location);
您需要将其写入该目录中的文件，例如
webClient.DownloadFile(settings.Update,Path.Combine(location,"myfile.txt"));
System.UnauthorizedAccessException: Access denied: 准确地告诉您发生了什么。正在将数据写入不允许的位置。错误信息中也提到了位置
C:\Users\pwlam\Desktop\launcher\Loader-master\Loader\LoadeRel\bin\Debug
由于该位置不是文件，因此您会收到错误消息。