I try make one program for download one .exe file and run for help in my job.
But idk how to make this, i'm new in VB.
I am using this code, as shown in the Visual Basic document reference:
My.Computer.Network.DownloadFile _
("http://www.cohowinery.com/downloads/WineList.txt", _
"C:\Documents and Settings\All Users\Documents\WineList.txt")
But when I try to download an .exe file, the entire file doesn't complete and I the file is only 1 kb after download.
The webclient should be the way to go a comment above highlights that too.
This is an example from another question:
Either use sync method:
public void DownloadFile()
{
using(var client = new WebClient())
{
client.DownloadFile(new Uri("http://www.FileServerFullOfFiles.net/download/test.exe"), "test.exe");
}
}
Or use new async-await approach:
public async Task DownloadFileAsync()
{
using(var client = new WebClient())
{
await client.DownloadFileTaskAsync(new Uri("http://www.FileServerFullOfFiles.net/download/test.exe"), "test.exe");
}
}
Then call this method like this:
await DownloadFileAsync();
Open up the .exe file you are trying to download in a text editor like NotePad. Odds are what is being downloaded is an HTML page showing some kind of error message like 404 not found.
Another possibility might be that AntiVirus software is moving the original EXE into quarantine and replacing it with a Quarantine MetaData file.
If the file does actually contain binary content your connection could be getting interrupted but odds are if this happened an exception would be thrown.
Related
I’m having an issue using EPPlus 6.0.6 on the server within an IIS process. I upload an xlsx to the IIS server, then call the method to process the file (read from the file only.) When finished, I want to remove the file from the server folder, but get the error:
The process cannot access the file because it is being used by another process.
Calling method:
Processor processor = new Processor (filename)
{
Await processor.Process();
try { File.Delete(selectedFile); txtStatusMsg += “Cleanup Succeeded”;}
catch (Exception e){ txtStatusMsg += $#"Cleanup Failed - {e.Message}"; }
// error occurs
// ex.message is
// The process cannot access the file because it is being used by another process.
}
The Process method has:
using (FileStream fs =
new FileStream(filename ,
FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
using (ExcelPackage srcPkg = new ExcelPackage(fs))
{
// read from the file
foreach (ExcelWorksheet srcWs in srcPkg.Workbook.Worksheets) ...
}
}
The file is still locked; I would expect the srcPkg to be disposed after the using block, and fs to be closed/disposed after its using block.
I’ve tried
srcPkg.Dispose();
after the for loop, and
fs.Close();
After the srcPkg using but neither help. Restarting IIS releases the file.
Can i force the file to be unlocked in some way?
Every once in a while, StorageFiles get locked and I get an UnauthorizedAccessException when trying to overwrite them. I cannot replicate this, it only happens randomly. This is the code for creating files:
using (var stream = new MemoryStream())
{
// ...populate stream with serialized data...
StorageFile file;
Stream fileStream;
try
{
file = await folder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
}
catch (UnauthorizedAccessException ex)
{
Debug.WriteLine("Access denied on file {0}", fileName);
return;
}
fileStream = await file.OpenStreamForWriteAsync();
using (fileStream)
{
stream.Seek(0, SeekOrigin.Begin);
await stream.CopyToAsync(fileStream);
await fileStream.FlushAsync();
}
}
Once a file starts throwing UnauthorizedAccessException, it will always throw it. As if the system has the file locked and I cannot touch it. I have to uninstall the application and rebuild.
When I open the file in my document, I can see that data there. Everything is fine. It was written successfully.
Can anyone see a problem with my code?
Are you saving the file token in the future access list? I ran into this problem when loading files and trying to save updates later. Once I started using the future access list, the problems went away.
http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.accesscache.storageitemaccesslist
It might be the case when the same file is being accessed from two different points in the code at the same time.
I have an msi installer, made via InstallShield, which moves some files to required location,
writes some info to registry and installes VSTO runtime. But I need to launch the .vsto file, that is installed with the application, after the installation is over. Can I do this with custom actions? If that file was an .exe file, that would be rather easy, but how could I launch a .vsto file?
[upd]
Well, may be there is an easier solution:
Can I just call the function:
public override void Install(IDictionary stateSaver)
from InstallShield? Something like that:
Custom Action->Call a function in a Windows Installer dynamic link library->stored in binary table=>
AssemblyFile = \InclusionListCustomActions.dll
MethodSignature = InclusionListCustomActions.TrustInstaller.Install(but what parameter goes here?)
You shouldn't launch the VSTO file because this will only install it per-user. What you should do is add it to the AddIns registry key for the office application you need and use the |vstolocal attribute to tell it to not deploy to the click once cache.
you can follow steps described in http://msdn.microsoft.com/en-us/library/cc563937%28v=office.12%29.aspx, you can copy same steps in Installshield, After file is copied and registry value set as specified, on starting office app it will automatically pick up vsto file
To add information to inclusion list you will have to write a console application and then call console app from installshield. Below code will help
string RSA_PublicKey = #"<RSAKeyValue><Modulus></Modulus></RSAKeyValue>";
//get this key from .vsto file
try
{
SecurityPermission permission =
new SecurityPermission(PermissionState.Unrestricted);
permission.Demand();
}
catch (SecurityException)
{
Console.WriteLine(
"You have insufficient privileges to " +
"register a trust relationship. Start Excel " +
"and confirm the trust dialog to run the addin.");
Console.ReadLine();
}
Uri deploymentManifestLocation = null;
var excelPath = YourAPPPath;
if (Uri.TryCreate(excelPath,
UriKind.RelativeOrAbsolute, out deploymentManifestLocation) == false)
{
Console.WriteLine(
"The location of the deployment manifest is missing or invalid.");
Console.ReadLine();
}
if (!File.Exists(excelPath))
{
UserInclusionList.Remove(deploymentManifestLocation);
Console.WriteLine(deploymentManifestLocation.ToString() + "removed from inclusion list");
}
else
{
AddInSecurityEntry entry = new AddInSecurityEntry(
deploymentManifestLocation, RSA_PublicKey);
UserInclusionList.Add(entry);
Console.WriteLine(deploymentManifestLocation.ToString() + "Added to inclusion list");
}
I have a small console application doing some persistence with Raven which is working fine, but I just can't get the Raven Studio Web-App working.
I think I have read every article/blog post on the web which is around, but I haven't got it working.
The project is referencing the Raven.Client.Embedded, Raven.Client.Lightweight and Raven.Storage.Esent assemblies)
Here is the really simple code starting up my console app:
class Program
{
static void Main(string[] args)
{
EmbeddableDocumentStore store = new EmbeddableDocumentStore { DataDirectory = #"C:\temp\ravendata", UseEmbeddedHttpServer = true };
store.Initialize();
Console.WriteLine("Initialized");
while (true)
{
string line = Console.ReadLine();
if (line == "w")
{
Changeset cs = CreateChangeset();
using (var session = store.OpenSession())
{
session.Store(cs);
session.SaveChanges();
}
Console.WriteLine("Written.");
}
}
The question is: Where to put the Raven.Studio.xap in order to get it running in the browser (http://localhost:8080/Raven/studio.html)?
It's not working in the bin/debug output folder of my console app (which would be the most logical area where it should be), as well as it isn't if I put it in the root of my console application.
Sorry to ask this thing again, but it seems there is some point I am missing on this to get it up and running. ;)
Thanks for your help, R's, Rene
You are right, I've tried it using a new console application project and had the same issues, altough I copied the file Raven.Studio.xap into the \bin\debug AFTER I had seen the error message for the first time.
I found out, that the reason for this has to do with browser-caching. Even though the file would be available now, the embedded http-server returns 304 Not Modified, because it had sent the If-None-Match header into the request. Therefore, the cached "not-found" page in the browser cache will be used.
I fixed it and sent a patch to Ayende. However the solution now is:
1) make sure Raven.Studio.xap is under \bin\debug
2) clear the browsers cache
I need to make my CF app self-updating through the web service.
I found one article on MSDN from 2003 that explains it quite well. However, I would like to talk practice here. Anyone really done it before or does everyone rely on third party solutions?
I have been specifically asked to do it this way, so if you know of any tips/caveats, any info is appreciated.
Thanks!
This is relatively easy to do. Basically, your application calls a web service to compare its version with the version available on the server. If the server version is newer, your application downloads the new EXE as a byte[] array.
Next, because you can't delete or overwrite a running EXE file, your application renames its original EXE file to something like "MyApplication.old" (the OS allows this, fortunately). Your app then saves the downloaded byte[] array in the same folder as the original EXE file, and with the same original name (e.g. "MyApplication.exe"). You then display a message to the user (e.g. "new version detected, please restart") and close.
When the user restarts the app, it will be the new version they're starting. The new version deletes the old file ("MyApplication.old") and the update is complete.
Having an application update itself without requiring the user to restart is a huge pain in the butt (you have to kick off a separate process to do the updating, which means a separate updater application that cannot itself be auto-updated) and I've never been able to make it work 100% reliably. I've never had a customer complain about the required restart.
I asked this same question a while back:
How to Auto-Update Windows Mobile application
Basically you need two applications.
App1: Launches the actual application, but also checks for a CAB file (installer). If the cab file is there, it executes the CAB file.
App2: Actual application. It will call a web service, passing a version number to the service and retrieve a URL back if a new version exists (). Once downloaded, you can optionally install the cab file and shut down.
One potiencial issue: if you have files that one install puts on the file system, but can't overwrite (database file, log, etc), you will need two separate installs.
To install a cab: look up wceload.exe http://msdn.microsoft.com/en-us/library/bb158700.aspx
private static bool LaunchInstaller(string cabFile)
{
// Info on WceLoad.exe
//http://msdn.microsoft.com/en-us/library/bb158700.aspx
const string installerExe = "\\windows\\wceload.exe";
const string processOptions = "";
try
{
ProcessStartInfo processInfo = new ProcessStartInfo();
processInfo.FileName = installerExe;
processInfo.Arguments = processOptions + " \"" + cabFile + "\"";
var process = Process.Start(processInfo);
if (process != null)
{
process.WaitForExit();
}
return InstallationSuccessCheck(cabFile);
}
catch (Exception e)
{
MessageBox.Show("Sorry, for some reason this installation failed.\n" + e.Message);
Console.WriteLine(e);
throw;
}
}
private static bool InstallationSuccessCheck(string cabFile)
{
if (File.Exists(cabFile))
{
MessageBox.Show("Something in the install went wrong. Please contact support.");
return false;
}
return true;
}
To get the version number: Assembly.GetExecutingAssembly().GetName().Version.ToString()
To download a cab:
public void DownloadUpdatedVersion(string updateUrl)
{
var request = WebRequest.Create(updateUrl);
request.Credentials = CredentialCache.DefaultCredentials;
var response = request.GetResponse();
try
{
var dataStream = response.GetResponseStream();
string fileName = GetFileName();
var fileStream = new FileStream(fileName, FileMode.CreateNew);
ReadWriteStream(dataStream, fileStream);
}
finally
{
response.Close();
}
}
What exactly do you mean by "self-updating"? If you're referring to configuration or data, then webservices should work great. If you're talking about automatically downloading and installing a new version of itself, that's a different story.
Found this downloadable sample from Microsoft- looks like it should help.
If you want to use a third-party component, have a look at AppToDate developed by the guys at MoDaCo.