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  • c# reading integer fields from database

    - by arnoldino
    what is wrong with this code? try { if (cmd == null) getConnection(); cmd.CommandText = "Select id from HMonthInventary where machine_id=37"; SQLiteDataReader reader = cmd.ExecuteReader(); if (reader.HasRows==true) { reader.Read(); string s = reader[0].ToString(); // return first element reader.Close(); return s; } reader.Close(); return null; } catch (Exception e) { MessageBox.Show("Caught exception: " + e.Message+"|"+cmd.CommandText); return null; } I checked the sql statement, it turns the right value. why can't I read it? the returnvalue is "".

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  • Reading Excel Files In C# Always Results In System.__ComObject?

    - by Soo
    This is the code I'm using to read an xls file: Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application(); Microsoft.Office.Interop.Excel.Workbook excelWorkbook = excelApp.Workbooks.Open(filePath, 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0); Microsoft.Office.Interop.Excel.Sheets excelSheets = excelWorkbook.Worksheets; Microsoft.Office.Interop.Excel.Worksheet excelSheet = (Microsoft.Office.Interop.Excel.Worksheet)excelSheets.get_Item(1); MessageBox.Show(excelSheet.Cells[1,1].ToString()); Which results in a message box with: System.__ComObject Not sure what's going on, I'd really appreciate any help, thanks!

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  • How to correctly hook and return GetDlgItemTextA from C++ to C# to C++ from EasyHook

    - by Gbps
    I'm using EasyHook, a C# library for injecting and detouring functions from unmanaged applications. I'm trying to hook onto GetDlgItemTextA, which takes the arguments: UINT WINAPI GetDlgItemText( __in HWND hDlg, __in int nIDDlgItem, __out LPTSTR lpString, __in int nMaxCount );` In my hook, I am casting it as: [DllImport("user32.dll", // CharSet = CharSet.Unicode, SetLastError = true, CallingConvention = CallingConvention.StdCall)] static extern uint GetDlgItemTextA(IntPtr hWin, int nIDDlgItem, StringBuilder text, int MaxCount); And my hook is: static uint DGetDlgItemText_Hooked(IntPtr hWin, int nIDDlgItem, StringBuilder text, int MaxCount) { // call original API... uint ret = GetDlgItemTextA(hWin, nIDDlgItem, text, MaxCount); MessageBox.Show(text.ToString()); return ret; } Unfortunately, the moment this is called, the hooked application crashes. Is there a better cast I can use to successfully hook onto this function? Thanks! I've compiled, editted, and confirmed the working condition of my EasyHook setup. This is just casing and hooking only.

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  • Why does setting a form's enabled property crash the application?

    - by Ruirize
    private void launchbutton_Click(object sender, EventArgs e) { launchbutton.Enabled = false; Process proc = new Process(); proc.EnableRaisingEvents = true; proc.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; //The arguments/filename is set here, just removed for privacy. proc.Exited += new EventHandler(procExit); proc.Start(); } private void procExit(object sender, EventArgs e) { MessageBox.Show("YAY","WOOT"); Thread.Sleep(2000); launchbutton.Enabled = true; } 2 Seconds after I quit the created process, my program crashes. Why?

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  • How to take first file name from a folder in C#

    - by riad
    Hi all, I need to get the first file name from a folder .How i do it in C#? My below code return all the file names.pls guide: DirectoryInfo di = new DirectoryInfo(imgfolderPath); foreach (FileInfo fi in di.GetFiles()) { if (fi.Name != "." && fi.Name != ".." && fi.Name != "Thumbs.db") { string fileName = fi.Name; string fullFileName = fileName.Substring(0, fileName.Length - 4); MessageBox.Show(fullFileName); } } I just need the first file name.pls guide thanks Riad

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  • How to set datetimepicker value to only date in (.NET)

    - by salhzmzm
    Hi I have DateTimePicker on my form and I set a value to the custom format property to "dd/MM/yyyy" ant when I run this code: MessageBox.Show(dateTimePicker1.Value.ToString()); I get this value : "3/26/2010 1:26 PM". How I can remove the time part from value. I know we can use this method dateTimePicker1.Value.ToShortDateString(); but I want to set the value property to this format "dd/MM/yyyy" so the output will be like this "26/3/2010", because I want to store the value in my DB (SQL) How I can do that?

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  • How do i set Savepoints for Linq to SQL and use "NO" ExecuteCommand ?

    - by nik
    TransactionScope TransactionABC = new TransactionScope(); try { context.Connection.Open(); { context.ExecuteCommand("insert into test (test) values (1)") context.SubmitChanges(); context.ExecuteCommand("savepoint test"); context.ExecuteCommand("insert into test (test) values (2)") context.SubmitChanges(); context.ExecuteCommand("rollback to test"); } TransactionABC.Complete(); TransactionABC.Dispose(); } catch (Exception ec) { MessageBox.Show(" ", ec.Message); } finally { context.Connection.Close(); } It works, but only with ExecuteCommand. I want to use a function, because i can't see what happens in the savepoint !

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  • how to copy database files from the network access server to Client PC in c#.net?

    - by zoya
    im using a code to copy the files from the database of server PC. so im accessing that server PC through IP address but it is giving me error and not copying the files in the folder of my PC (client PC) this is my code that im using...can u tell me where im wrong?? the file path is given on my listview in winform.. public string RecordingFileCopy(string recordpath,string ipadd) { string strFinalPath; strFinalPath = String.Format("\\{0}'{1}'",ipadd,recordpath); return strFinalPath; } on button click event.... { try { foreach (ListViewItem item in listView1.Items) { string sourceFile = item.SubItems[5].Text; RecordingFileCopy(sourceFile,"10.0.4.123"); File.Copy(sourceFile, Path.Combine(@"E:\name\MyDir", Path.GetFileName(sourceFile))); } } catch { MessageBox.Show("Files are not copied to folder", _strMsg, MessageBoxButtons.OK, MessageBoxIcon.Error); } }

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  • CaptureCameraDialog returns OK but does not save (Motorola ES400)

    - by Dominic
    Ok it seems like everyone in the world has issues with CaptureCameraDialog. In my case the result is OK, but when taking the photo there is a MessageBox that says "Error" that appears and disappears in the blink of an eye, then returns to my app (so I don't have time to actually read the error). It has not saved the file. It does not throw an error to my application. There is also another issue which is exactly the same as the issue talked about here (yet none of the fixes work for me). http://www.pcreview.co.uk/forums/thread-4025602.php Does anyone know how to get the "error message" that the dialogue box displays for an instant?

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  • How to make code run a certain amount of times before returning something?

    - by user3564967
    I made a trivia game and I have to make a method (SuccessOrFail) that will return whether the user beat the trivia or not. namespace D4 { /// <summary> /// Displays the trivia and returns whether the user succeeded or not, number of questions asked, and a free piece of trivia. /// </summary> public partial class TriviaForm : Form { private Trivia trivia; private Question question; private Random rand = new Random(); private HashSet<int> pickedQuestion = new HashSet<int>(); private string usersAnswer; private int numCorrectAnswers; private int numIncorrectAnswers; public TriviaForm() { InitializeComponent(); this.trivia = new Trivia(); QuestionRandomizer(); QuestionOutputter(); } /// <summary> /// This method will return true if succeeded or false if not. /// </summary> /// <returns>Whether the user got the trivia right or not</returns> public bool SuccessOrFail(bool wumpus) { bool successOrFail = false; int maxQuestions = 3; if (wumpus == true) maxQuestions = 5; int numNeededCorrect = maxQuestions / 2 + 1; if (this.usersAnswer == question.CorrectAnswer.ToString()) numCorrectAnswers++; else numIncorrectAnswers++; if (numCorrectAnswers + numIncorrectAnswers == maxQuestions) { if (numCorrectAnswers == numNeededCorrect) successOrFail = true; else successOrFail = false; numCorrectAnswers = 0; numIncorrectAnswers = 0; return successOrFail; } else return false; } /// <summary> /// This method will output a free answer to the player. /// </summary> public string FreeTrivia() { return question.Freetrivia; } // This method tells the player whether they were correct or not. private void CorrectOrNot() { if (this.usersAnswer == question.CorrectAnswer.ToString()) MessageBox.Show("Correct"); else MessageBox.Show("Incorrect"); } // Displays the questions and answers on the form. private void QuestionOutputter() { this.txtQuestion.Text = question.QuestionText; this.txtBox0.Text = question.Answers[0]; this.txtBox1.Text = question.Answers[1]; this.txtBox2.Text = question.Answers[2]; this.txtBox3.Text = question.Answers[3]; } // Clears the TextBoxes and displays a new random question. private void btnNext_Click(object sender, EventArgs e) { this.usersAnswer = txtAnswer.Text; CorrectOrNot(); this.txtQuestion.Clear(); this.txtBox0.Clear(); this.txtBox1.Clear(); this.txtBox2.Clear(); this.txtBox3.Clear(); this.txtAnswer.Clear(); this.txtAnswer.Focus(); QuestionRandomizer(); QuestionOutputter(); this.txtsuc.Text = SuccessOrFail(false).ToString(); } // Choose a random number and assign the corresponding data to question, refreshes the list if all questions used. private void QuestionRandomizer() { if (pickedQuestion.Count < trivia.AllQuestions.Count) { int random; do { random = rand.Next(trivia.AllQuestions.Count); } while (pickedQuestion.Contains(random)); pickedQuestion.Add(random); this.question = trivia.AllQuestions.ToArray()[random]; if (pickedQuestion.Count == trivia.AllQuestions.ToArray().Length) pickedQuestion.Clear(); } } } } My question is how to make it so that the code asks the user 3 or 5 questions and then returns whether the user won or not? I was wondering if somehow I could make a public void that would just make the form pop up and ask the user 3 to 5 questions and then once it asks the maximum number of questions, to close and then have a method that returns true if the user won, or false if they didn't. But I literally have no idea how to do that. Edit: So I know a for loop can make code run more than once. But the problem I'm having is, is that I don't know how to make it so that the trivia game asks 3 to 5 questions BEFORE returning something.

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  • create a folder and files in c:\program files\myApp\data in windows 7

    - by ile
    I have an old c++ application that needs to be modified to work with windows 7. Problem is in creating a new folder and saving a file in that folder. This folder should be created in c:\program files\myApp\data\newFolder. This is function I use to create new folder and get errors: if(!CreateDirectory(pathSamples,NULL)) //Throw Error { DWORD errorcode = GetLastError(); LPVOID lpMsgBuf; FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorcode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&lpMsgBuf, 0, NULL ); MessageBox(NULL, (LPCTSTR)lpMsgBuf, TEXT("Error"), MB_OK); } In XP this works, but in Windows 7 it doesn't. If I run application as administrator than the folder is created, otherwise "Access is denied" error is thrown. My question is following: Is there an option to make changes to the code so that the folder can be created in "program files" nad that files can be saved in this folder? PS I saw this thread already but it doesn't answer my question. Thanks, Ilija

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  • tkinter python entry not being displayed

    - by user1050619
    I have created a Form with labels and entries..but for some reason the entries are not being created, peoplegui.py from tkinter import * from tkinter.messagebox import showerror import shelve shelvename = 'class-shelve' fieldnames = ('name','age','job','pay') def makewidgets(): global entries window = Tk() window.title('People Shelve') form = Frame(window) form.pack() entries = {} for (ix, label) in enumerate(('key',) + fieldnames): lab = Label(form, text=label) ent = Entry(form) lab.grid(row=ix, column=0) lab.grid(row=ix, column=1) entries[label] = ent Button(window, text="Fetch", command=fetchRecord).pack(side=LEFT) Button(window, text="Update", command=updateRecord).pack(side=LEFT) Button(window, text="Quit", command=window.quit).pack(side=RIGHT) return window def fetchRecord(): print('In fetch') def updateRecord(): print('In update') if __name__ == '__main__': window = makewidgets() window.mainloop() When I run it the labels are created but not the entries.

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  • Properties.Settings.Default.Default.Save() does not work

    - by Akshay
    I have created code in WPF to let the window remember its last location like this: private void Window_Loaded(object sender, RoutedEventArgs e) { try { Rect storedLoc = Properties.Settings.Default.WindowSavedLocation; this.Top = storedLoc.Top; this.Left = storedLoc.Left; } catch { MessageBox.Show("No settings stored !"); } } private void Window_Closed(object sender, EventArgs e) { Properties.Settings.Default.WindowSavedLocation = RestoreBounds; Properties.Settings.Default.Save(); } When I build the application I can see that the app.exe.config file has the setting WindowSavedLocation but it just does not save and throws no exception. Everytime I run the application, it says "No settings stored !". It's scope is user.

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  • Items are being replace by another in the Datagridview

    - by stephanie
    When I add the first item in the datagridview its ok but when i add the second one it replace the last item being added. here's my code Private Sub add() Dim i As Integer For i = 0 To DataGridView1.Rows.Count - 1 'DataGridView1.Rows.Add() DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("TransID").Value = txttrans.Text DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("ProductCode").Value = txtprodcode.Text DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("ProductName").Value = cmbprodname.Text DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("Quantity").Value = txtqty.Text DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("Price").Value = txtprc.Text DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("Amount").Value = txtat.Text DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("CustomerName").Value = txtcust.Text DataGridView1.Rows(DataGridView1.RowCount - 1).Cells("Date1").Value = txtdate.Text Next i End Sub And this is in my ADDbutton: Private Sub btnadd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnadd.Click Try add() Catch ex As Exception MessageBox.Show(ex.Message) End Try Dim total As Integer For Each row As DataGridViewRow In DataGridView1.Rows total += row.Cells("Amount").Value Next txtamt.Text = total

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  • Using FileSystemWatcher in detecting a xml file, using Linq in reading the xml file and prompt the results error "Root Element is Missing"

    - by GrayFullBuster
    My application is already working it can detect the xml file and prompt the content of the xml file but sometimes it will prompt "Root element is missing", and sometimes also it is okay but when I open the xml file, it is ok, it has contents on it. How to solve this issue. Here is the screenshot of the error: Here is the code: private void fileSystemWatcher_Created(object sender, System.IO.FileSystemEventArgs e) { string invoice = ""; using (var stream = System.IO.File.Open(e.FullPath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite)) { var doc = System.Xml.Linq.XDocument.Load(stream); var transac = from r in doc.Descendants("Transaction") select new { InvoiceNumber = r.Element("InvoiceNumber").Value, }; foreach (var i in transac) { invoice = i.InvoiceNumber; } } MessageBox.Show(invoice); fileSystemWatcher.EnableRaisingEvents = false; } The error goes here var doc = System.Xml.Linq.XDocument.Load(stream);

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  • How can I redirect the stdout of ironpython in C#?

    - by Begtostudy
    public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button3_Click(object sender, EventArgs e) { try { var strExpression = @" import sys sys.stdout=my.write print 'ABC' "; var engine = Python.CreateEngine(); var scope = engine.CreateScope(); var sourceCode = engine.CreateScriptSourceFromString(strExpression); scope.SetVariable("my", this); var actual = sourceCode.Execute(scope); textBox1.Text += actual; } catch (System.Exception ex) { MessageBox.Show(ex.ToString()); } } public void write(string s) { textBox1.Text += s; } }<code> But Exception says there is not write. Where is wrong? Thanks!

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  • Catch Commandline error

    - by Bi
    Hi I am trying to catch an error with an incorrect commandline parameter for the application of form Myapp.exe myFile.txt The application however throws an "Unhandled exception - The path is not of legal form". Below is my code and I am wondering why it does not show the message box as provided in the code? Thanks. String[] cmdlineArgs = Environment.GetCommandLineArgs(); if (cmdlineArgs.Length == 2) { try { if (File.Exists(cmdlineArgs[1].ToString())) ConfigParameters.SetConfigParameters(cmdlineArgs[1].ToString()); else { MessageBox.Show("Configuration file does not exist.Restarting..."); Environment.Exit(1); } } catch (Exception ex) { }

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  • passin structure form VC++ to C#

    - by Anu
    Hi, im using C# dll in VC++ application.I have somedetails in VC++ like PageNumer pageTitle PageDesc BoxDetail I have to pass this to C# Dll. So i made one structure in VC++,then i pas that to C#.But i could't do that.Pls help mw. VC++ Function: struct SCS3OverVwPg { __int32 iOvrPgNo; char sOvrPgTitle[30]; //OverView Page Title }; void CToolTab::SendOverview() { SCS3OverVwPg *pOverVw = 0; pOverVw = new SCS3OverVwPg; Globals1::gwtoolbar->SetTree(pOverVw); } C# function: public struct SCS3Over { Int32 iOvrPgNo; char[] sOvrPgTitle; } public void SetTree(SCS3Over x) { MessageBox.Show("Data received"); } If i do like this,it shows error error C2664: 'Tabcontrol::ToolBar::SetTree' : cannot convert parameter 1 from 'SCS3OverVwPg *' to 'SCS3Over' IF i change name in C# dll to SCS3OverwPg, it show error of structure redifinition Pls help me.

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  • How to check whether a excel file is write protected or not in C#?

    - by Pavan Navali
    Hi, I'm developing a sample application in which I have to open an excel file and check whether the file is write protercteed or not. The code is using System.Windows.Forms; using Microsoft.Office.Core; private void button1_Click(object sender, EventArgs e) { string fileNameAndPath = @"D:\Sample\Sample1.xls"; // the above excel file is a write protected. Microsoft.Office.Interop.Excel.Application a = new Microsoft.Office.Interop.Excel.Application(); if (System.IO.File.Exists(fileNameAndPath)) { Microsoft.Office.Interop.Excel.ApplicationClass app = new Microsoft.Office.Interop.Excel.ApplicationClass(); // create the workbook object by opening the excel file. app.Workbooks.Open(fileNameAndPath,0,false,5,"","",true,Microsoft.Office.Interop.Excel.XlPlatform.xlWindows,"\t",false, true, 0,false,true,0); Microsoft.Office.Interop.Excel._Workbook w = app.Workbooks.Application.ActiveWorkbook; if (w.ReadOnly) MessageBox.Show("HI"); // the above condition is true. } } I would like know whether the file is write protected or not.

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  • How to update the progress bar in runtime using c#

    - by karthik
    I am using the below code to update my progress bar. ProgressBar.Visible = true; ProgressBar.Minimum = 1; ProgressBar.Maximum = PortCount; ProgressBar.Value = 1; ProgressBar.Step = 1; int intdata = 5; for (int x = 1; x <= intdata; x++) { ProgressBar.PerformStep(); } MessageBox.Show("Done"); But, it is not getting updated during runtime. Is it because the progress bar is in the same thread. If so, how to update this progress from another thread. Help...

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  • C# Serial Communications - Received Data Lost

    - by Jim Fell
    Hello. Received data in my C# application is getting lost due to the collector array being over-written, rather than appended. private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) { try { pUartData_c = serialPort1.ReadExisting().ToCharArray(); bUartDataReady_c = true; } catch ( System.Exception ex ) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } In this example pUartData_c is over-written every time new data is received. On some systems this is not a problem because the data comes in quickly enough. However, on other systems data in the receive buffer is not complete. How can I append received data to pUartData_c, rather than over-write it. I am using Microsoft Visual C# 2008 Express Edition. Thanks.

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  • How can i use listDictionary?

    - by Phsika
    i can fill my listdictinary but, if running error returns to me in " foreach (string ky in ld.Keys)"(invalid operation Exception was unhandled) Error Detail : After creating a pointer to the list of sample collection has been changed. C# ListDictionary ld = new ListDictionary(); foreach (DataColumn dc in dTable.Columns) { MessageBox.Show(dTable.Rows[0][dc].ToString()); ld.Add(dc.ColumnName, dTable.Rows[0][dc].ToString()); } foreach (string ky in ld.Keys) if (int.TryParse(ld[ky].ToString(), out QuantityInt)) ld[ky] = "integer"; else if(double.TryParse(ld[ky].ToString(), out QuantityDouble)) ld[ky]="double"; else ld[ky]="nvarchar";

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  • Wpf application variable not changing

    - by Hasan Zubairi
    In my application I need some variables on almost all the pages so I declared them in Application.xaml like <sys:String x:key="First">First</sys:String> and on one page I change the value in code like Resources["First"] = "This is First"; on the second page when I call the variable like String f = (string)this.TryFindResource("First"); MessageBox.Show(f); the out put is "First" and not "This is First". I also tried like. Application.Current.Properties["First"]

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  • How to make simple mathematical operations and displaying the result in a textbox

    - by Audel
    Hi, I know is a rather simple question but I just can't find an appropriate example in google or anywhere. I've got this piece int numberOfPlays = int.Parse(textBox2.Text); numberOfPlays = (numberOfPlays++); textBox2.Text = (numberOfPlays.ToString()); MessageBox.Show(numberOfPlays.ToString()); So basically what I want to do is to get the value of the textBox2, make it an integer and then add 1 to it. I can't think of any more details right now, so if i'm not clear enough please ask Thanks in advance

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  • Attempted to perform an unauthorized operation

    - by Lefteris Gkinis
    Now I use the following code: Public Function SetACL(ByVal filename As String, ByVal account As String, ByVal sender As Object, ByVal e As System.EventArgs) As Boolean Try Dim rule As FileSystemAccessRule = New FileSystemAccessRule(account, FileSystemRights.Write, AccessControlType.Allow) Dim fp As PermissionSet = New PermissionSet(Permissions.PermissionState.Unrestricted) fp.AddPermission(New FileIOPermission(FileIOPermissionAccess.Read, filename)) fp.AddPermission(New FileIOPermission(FileIOPermissionAccess.Write, filename)) fp.AddPermission(New FileIOPermission(FileIOPermissionAccess.PathDiscovery, filename)) fp.Assert() Dim di As DirectoryInfo = New DirectoryInfo(Path.GetDirectoryName(filename)) SetACL = False Dim security As DirectorySecurity = di.GetAccessControl(AccessControlSections.Access) security.ModifyAccessRule(AccessControlModification.Add, rule, SetACL) di.SetAccessControl(security) Return SetACL Catch ex As Exception MessageBox.Show(ex.Message, "Set Security Sub", MessageBoxButtons.OK, MessageBoxIcon.Stop) Finalize() End Try End Function The Error of 'Attempted to perform an unauthorized operation' comes when i'm trying to execute the instraction Dim security As DirectorySecurity = di.GetAccessControl(AccessControlSections.Access) Please if anybody knows why that error comes here to respond

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