Develop Reference

I am making a quiz game for my alevel software systems developement and my code is fine but I cant run my code

There is nothing wrong in the syntax of my code but whenever I try to run it keeps saying "The process cannot access the file because it is being used by another process". The only way I am running my application is my ending my application from the task manager. Please help me by explaining why this is happening and how to fix it.
private void btnLogin_Click(object sender, EventArgs e)
{
if (File.Exists("users.txt"))
{
string[] users = File.ReadAllLines("users.txt");
bool userFound = false;
foreach (string user in users)
{
string[] splitDetails = user.Split('~');
string username = splitDetails[1];
string password = splitDetails[2];
if ((txtBoxUsername.Text == username) && (txtBoxPassword.Text == password))
{
userFound = true;
break;
}
}
if (userFound)
{
Hide();
HomeForm home = new HomeForm();
home.Show();
}
else
{
MessageBox.Show("User details are incorrect",
"Incorrect details entered");
}
}
else
{
MessageBox.Show("No users have been registered", "No users");
}
}
private void btnRegister_Click(object sender, EventArgs e)
{
Hide();
RegisterForm registerForm = new RegisterForm();
registerForm.Show();
}
This application is for my a level software systems development coursework and I am coding it in c#. I have only been learning c# for the past 5 months so I am still a beginner. I have already tried to find the answer to my problem in stack overflow and other websites.
I am expecting my application to launch when I press run, but instead I get a dialog box saying:
Error Unable to copy file "obj\Debug\SSD AS2 coursework.exe" to "bin\Debug\SSD AS2 coursework.exe". The process cannot access the file 'bin\Debug\SSD AS2 coursework.exe' because it is being used by another process.
SSD AS2 coursework

Check if you are closing all windows of your application when finalizing the app.
You must use Application.Exit() in any events that are going to finalize your application.
You can read more on the Documentation

It seems like the file you are trying to open is being used by another process try to close your text editor or another program writing to that file.
it is still possible to overcome the issue by using FileShare.ReadWrite and use the file from multiple processes, example on the following code:
FileStream fileStream = new FileStream("c:\users.txt", FileMode.Open,
FileAccess.Read, FileShare.ReadWrite);
StreamReader fileReader = new StreamReader(fileStream);
while (!fileReader.EndOfStream)
{
string user = fileReader.ReadLine();
string[] splitDetails = user.Split('~');
// the rest of the user logic in here...
}
fileReader.Close();
fileStream.Close();

Xamarin.Android PackageInstaller Session.commit "Files still open" Exception on apk silent install

I'm trying to code a proof of concept, with Xamarin android.
A sort of EMM tool, i.e. an application which will be in charge of installing other applications and managing the device.
So Android Marshmallow is a good place to start with android for work features.
My app is a Device Owner, therefore it should have no problem silently installing other applications. It can download an apk from a website without any problem. But when I try to install it, it throws a "Files still open" exception despite calling all Close() methods.
I have taken my code from the excellent android-testdpc github example here.
I have changed it to work in C# with Xamarin.
Here is my code:
public static bool InstallPackage(Context context, Handler handler, InputStream input, String packageName)
{
try
{
PackageInstaller packageInstaller = context.PackageManager.PackageInstaller;
PackageInstaller.SessionParams param = new PackageInstaller.SessionParams(PackageInstallMode.FullInstall);
param.SetAppPackageName(packageName);
// set params
int sessionId = packageInstaller.CreateSession(param);
PackageInstaller.Session session = packageInstaller.OpenSession(sessionId);
using (System.IO.Stream output = session.OpenWrite("COSU", 0, -1))
{
byte[] buffer = new byte[65536];
int c;
while ((c = input.Read(buffer)) != -1)
{
output.Write(buffer, 0, c);
}
session.Fsync(output);
input.Close();
output.Close();
}
session.Commit(createIntentSender(context, sessionId)); // this line throws exception 'Files stil open'
return true;
}
catch (Exception ex)
{
Log.Error(TAG, "Error installing package: " + packageName, ex);
handler.SendMessage(handler.ObtainMessage(Common.MSG_INSTALL_FAIL,
packageName));
return false;
}
}
I'm stuck with this for the moment. If I have the time, I will try to install Android Studio and test my code in Java to see if the problem comes from Xamarin.
If someone has any clue for my problem, I will greatly appreciate the help.

SecurityException : if streams opened through openWrite(String, long, long) are still open.
The Java peer object is not closed yet, this is how I force it for the PackageInstaller.Session.Commit:
var input = Assets.Open(packageName);
var packageInstaller = PackageManager.PackageInstaller;
var sessionParams = new PackageInstaller.SessionParams(PackageInstallMode.FullInstall);
sessionParams.SetAppPackageName(packageName);
int sessionId = packageInstaller.CreateSession(sessionParams);
var session = packageInstaller.OpenSession(sessionId);
using (var output = session.OpenWrite(packageName, 0, -1))
{
input.CopyTo(output);
session.Fsync(output);
foreach (var name in session.GetNames())
Log.Debug("Installer", name);
output.Close();
output.Dispose();
input.Close();
input.Dispose();
GC.Collect();
}
var pendingIntent = PendingIntent.GetBroadcast(BaseContext, sessionId, new Intent(Intent.ActionInstallPackage), 0);
session.Commit(pendingIntent.IntentSender);

C# inserting a jpg file into an Outlook email message

This is my first time posting a question although I have been lurking and learning from all of you for a while now. I have been developing a C# Windows Form application that automates several day to day activities. One of the simplest pieces of this application is really giving me a hard time.
I need to insert two jpg files into an Email that I am responding to. I can accomplish this by pulling the files directly from the drive but would prefer them to be stored as a resource in the executable. This way I can pass the EXE to others and they can use it also. Here is an example of the code that works when it is stored locally. what I would prefer to do however is replace #"H:\ISOIR\PhishMeIcon.jpg" with Resource1.PhishMeIconJPG . I have seen several discussion about streams and converting the file to Byte format but this does not seem to interact well with Outlook.
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show("Make sure you have the Email reporting the incident Open");
string inc_num;
inc_num = incident_number.Text;
Microsoft.Office.Interop.Outlook.Application aPP = new Microsoft.Office.Interop.Outlook.Application(1);
Microsoft.Office.Interop.Outlook.MailItem mail = (Microsoft.Office.Interop.Outlook.MailItem)aPP.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem);
Microsoft.Office.Interop.Outlook.Folder f = aPP.Session.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderDrafts) as Microsoft.Office.Interop.Outlook.Folder;
Microsoft.Office.Interop.Outlook.Inspector inSpect = null;
Microsoft.Office.Interop.Outlook.MailItem sMail = null;
Microsoft.Office.Interop.Outlook.MailItem rMail = null;
Microsoft.Office.Interop.Outlook.Attachment phishICO = null;
try
{
inSpect = aPP.ActiveInspector();
sMail = inSpect.CurrentItem as Microsoft.Office.Interop.Outlook.MailItem;
rMail = sMail.ReplyAll();
phishICO = rMail.Attachments.Add(#"H:\ISOIR\PhishMeIcon.jpg", Microsoft.Office.Interop.Outlook.OlAttachmentType.olEmbeddeditem, null, "name");
string imageCid = "PhishMeIcon.jpg#123";
phishICO.PropertyAccessor.SetProperty("http://schemas.microsoft.com/mapi/proptag/0x3712001E", imageCid);
rMail.Subject = ("INC- ") + inc_num;
rMail.HTMLBody = Resource1.SPAM_Response_P1 + String.Format("<body><img src=\"cid:{0}\"></body>", imageCid) + Resource1.SPAM_Response_P2 + rMail.HTMLBody;
rMail.HTMLBody = rMail.HTMLBody.Replace("XXXX", inc_num);
rMail.Save();
MessageBox.Show("Your Email has been saved in your DRAFT Folder for review");
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message,
"An exception is occured in the code of add-in.");
}
finally
{
if (sMail != null) System.Runtime.InteropServices.Marshal.ReleaseComObject(sMail);
if (rMail != null) System.Runtime.InteropServices.Marshal.ReleaseComObject(rMail);
if (inSpect != null) System.Runtime.InteropServices.Marshal.ReleaseComObject(inSpect);
}
}

Puma.NET DLL Recognition of car numbers

I want to make an application - license plate recognition from image. I use OpenCvSharp and Puma.NET.
But when I start my application,writes that the number is not found.
When I use breakpoints - Exception - "Recognition engine halted with code:0"
I loaded three dll - dibapi.dll, puma.net.dll, puma.interop.dll.
Why numbers are not recognized?
public void RecognizePlate() //
{
plateList.Clear();
int i = 1;
foreach(var plateImage in plate)
{
plateList.Add(i.ToString()+ " ) " + RunPuma(plateImage));
i++;
}
}
string RunPuma(IplImage img) //
{
PumaPage Image = new PumaPage(img.ToBitmap());
using (Image)
{
Image.FileFormat = PumaFileFormat.RtfAnsi;
Image.AutoRotateImage = true;
Image.FontSettings.DetectBold = true;
Image.FontSettings.DetectItalic = true;
Image.EnableSpeller = false;
Image.Language = PumaLanguage.English;
try
{
string s = Image.RecognizeToString();
return s;
}
catch(Exception e)
{
return "This is NOT NUMBER";
}
}
return "Error";
}`

You will need to restart Visual Studio as Administrator and you should be able to work then.

The problem is an unsuccessful registration.
According the documentation, apuma.dll component should be registered during the installation. But *.bat file seems to be wrong, at least for my computer.
I solved problem with:
moving all files from Puma.NET\COM Server\Register to Puma.NET\COM Server
open console in Puma.NET\COM Server directory.
Typing this command: regsvr32 APuma.dll
If you get a successful registration message, George is your uncle!!

How to close a file in Autocad using C# keeping acad.exe running?

I am using visual studio 2010 and I am having a .DWG file which I want to open in autocad. Till now I have used this.
Process p = new Process();
ProcessStartInfo s = new ProcessStartInfo("D:/Test File/" + fileName);
p.StartInfo = s;
p.Start();
But what I want is to close the file inside the Autocad but not the autocad itself. (Means atocad.exe should be kept running).
Till now I hve used this but its closing the acad.exe not the file.
foreach (Process Proc in Process.GetProcesses())
{
if (Proc.ProcessName.Equals("acad"))
{
Proc.CloseMainWindow();
Proc.Kill();
}
}

Take the Autocad .NET libraries from Autodesk Sites (http://usa.autodesk.com/adsk/servlet/index?id=773204&siteID=123112)
Then you will be able to use Application and Document classes.
They will give you full control over opening and closing documents within the application.
You can find many articles on that, and can ask further questions.

AutoCAD does have an api. there are 4 assemblys. Two for in-process and two for COM.
inprocess :
acdbmgd.dll
acmgd.dll
COMInterop :
Autodesk.Autocad.Interop.dll
Autodesk.Autocad.Interop.Common.dll
this is a method that will open a new instance of AutoCAD or it will connect to an existing running instance of AutoCAD.
you will need to load these .dlls into your project references.
using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;
namespace YourNameSpace {
public class YourClass {
AcadApplication AcApp;
private const string progID = "AutoCAD.Application.18.2";// this is AutoCAD 2012 program id
private string profileName = "<<Unnamed Profile>>";
private const string acadPath = #"C:\Program Files\Autodesk\AutoCAD 2012 - English\acad.exe";
public void GetAcApp()
{
try
{
AcApp = (AcadApplication)Marshal.GetActiveObject(progID);
} catch {
try {
var acadProcess = new Process();
acadProcess.StartInfo.Arguments = string.Format("/nologo /p \"{0}\"", profileName);
acadProcess.StartInfo.FileName = (#acadPath);
acadProcess.Start();
while(AcApp == null)
{
try { AcApp = (AcadApplication)Marshal.GetActiveObject(progID); }
catch { }
}
} catch(COMException) {
MessageBox.Show(String.Format("Cannot create object of type \"{0}\"",progID));
}
}
try {
int i = 0;
var appState = AcApp.GetAcadState();
while (!appState.IsQuiescent)
{
if(i == 120)
{
Application.Exit();
}
// Wait .25s
Thread.Sleep(250);
i++;
}
if(AcApp != null){
// set visibility
AcApp.Visible = true;
}
} catch (COMException err) {
if(err.ErrorCode.ToString() == "-2147417846"){
Thread.Sleep(5000);
}
}
}
}
}
closeing it is as simple as
Application.Exit();
and forgive the code. its atrocious, this was one of my first methods when i just started developing...

I doubt you will be able to do this unless AutoCAD has an API that you can hook into and ask it to close the file for you.
Your c# app can only do things to the process (acad.exe) , it doesn't have access to the internal operations of that process.

Also, you shouldn't use Kill unless the process has become unresponsive and certainly not immediately after CloseMainWindow.
CloseMainWindow is the polite way to ask an application to close itself. Kill is like pulling the power lead from the socket. You aren't giving it the chance to clean up after itself and exit cleanly.

There is one other possibility - this will only work if your C# code is running on the same machine as the AutoCAD process and it is not really recommended, but, if you are really stuck and are prepared to put up with the hassle of window switching you can send key strokes to an application using the SendKeys command.
MSDN articles here:
http://msdn.microsoft.com/EN-US/library/ms171548(v=VS.110,d=hv.2).aspx
http://msdn.microsoft.com/en-us/library/system.windows.forms.sendkeys.send.aspx
Using this you could send the key strokes to simulate the user using the menu commands to close the file.

To perform the closing of file, best way out is to follow the steps at this ObjectARX SDK for c# and change the following code with the below code.
[CommandMethod("CD", CommandFlags.Session)]
static public void CloseDocuments()
{
DocumentCollection docs = Application.DocumentManager;
foreach (Document doc in docs)
{
// First cancel any running command
if (doc.CommandInProgress != "" &&
doc.CommandInProgress != "CD")
{
AcadDocument oDoc =
(AcadDocument)doc.AcadDocument;
oDoc.SendCommand("\x03\x03");
}
if (doc.IsReadOnly)
{
doc.CloseAndDiscard();
}
else
{
// Activate the document, so we can check DBMOD
if (docs.MdiActiveDocument != doc)
{
docs.MdiActiveDocument = doc;
}
int isModified =
System.Convert.ToInt32(
Application.GetSystemVariable("DBMOD")
);
// No need to save if not modified
if (isModified == 0)
{
doc.CloseAndDiscard();
}
else
{
// This may create documents in strange places
doc.CloseAndSave(doc.Name);
}
}
}