mfc class wizard pops up everytime!

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  - 1
    - connecting remore access 97 databaseHi
      
      I am trying to connect remote access 97 database form ASP.NET page from vb.net using this connection string
      "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\ServerName\cdrive\Dt\ct\ct.mdb;
      I get this erro
      "The Microsoft Jet database engine cannot open the file '\\ServerName\cdrive\Dt\ct\ct.mdb' It is already opened exclusively by another user, or you need permission to view its data
      
      If I use with null pwd
      "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\ServerName\cdrive\Dt\ct\ct.mdb;PWD=
      I get this error "Could not find installable ISAM.
      
      Some one please help
      Thank
      ashra
  - 2
    - system timeoutsI have been trying to do some of the win server 2003
      assesment exams and they keep hanging in the middle of the
      assesments with unable to display page error. Anyone else
      hving this problem? I have tried from two different
      locations but about 30% of the time it works and 70% of
      the time it fails
  - 3
    - mfc class wizard pops up everytime!hi,
      
      i just started with vc7 with an MFC dialog box project. I added
      some controls and attached variables... it worked out fine. I
      don't know what happened but now every control I doubleclick
      pops up the MFC Class Wizard. Right-clicking any control does
      not show the ADD VARIABLE option anymore. The ClassView
      does not show TestMFCDlg as a class anymore (the AboutDlg
      class is there and I can add variables to it as well!)
      
      Can somebody please tell me what went wrong?
      
      IDE version: 7.0.9466
      
      Thank you.
      
      dtor
  - 4
    - Text file IOI have a class that inputs data from a text file. The files can be very
      large, and I'd like to display a progress bar to the user. Of course, to
      determine this I need to know the total number of lines in the file. What's
      the most efficient (i.e. fastest) way to get it? Right now I use brute
      force: I read through the entire file, counting the lines but not processing
      the data (code below). Then I reset the ifstream to prepare for reading the
      data. Is there a better way?
      
      Thanks,
      Chip
      
      // Construct ifstrem object for file input
      ifstream File(Filename, ios::nocreate);
      
      ********
      // Count total lines in file
      streampos StartPos = File.tellg(); // Get file start position
      FileLines = 0;
      while(!File.eof())
      {
      File.ignore(1000, '\n'); // Get/ignore line
      FileLines++;
      }
      
      // Prepare File for reading/processing
      File.seekg(StartPos); // Return istream ptr to start position
      File.clear(); // Reset eof bit
      TRACE("File has %i lines\n", FileLines);
      
      ******
      // Read data...
  - 5
    - MarshalingGuys, please help. I am trying to make this work from at least 4 months.
      I am new to programming and some things are difficult to me, but I really
      need to make my project work.
      I can't find anything helpfull in internet for 4 months ;-( .
      Please someone who is more expirenced help me.
      
      I am trying to use the Terminal Server APIs
      There is as an API function WTSEnumerateSessions, which returns a
      WTS_SESSION_INFO custom structure n times.
      Actually it returns pointer to it.
      I just can't get it working in VB .NET
      While searching through MSDN I've found something, but I need an opinion
      from someone more experienced.
      
      The text is:
      ======
      Formatted Non-Blittable Classes
      Formatted non-blittable classes have fixed layout (formatted) but the data
      representation is different in managed and unmanaged memory. The data can
      require transformation under the following conditions:
      
      If a non-blittable class is marshaled by value, the callee receives a
      pointer to a copy of the data structure.
      If a non-blittable class is marshaled by reference, the callee receives
      a pointer to a pointer to a copy of the data structure.
      If the InAttribute attribute is set, this copy is always initialized
      with the instance's state, marshaling as necessary.
      If the OutAttribute attribute is set, the state is always copied back to
      the instance on return, marshaling as necessary.
      If both InAttribute and OutAttribute are set, both copies are required.
      If either attribute is omitted, the marshaler can optimize by eliminating
      either copy.
      
      Found at:
      (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconconsumingunmanageddllfunctions.asp)
      ======
      According to this the date returned from WTSEnumerateSessions function is a
      pointer to a pointer a copy of the data structure.
      Or I am wrong?
      
      If I am right, how to get this second pointer from VB .NET?
      
      Here are the API Function and structure, by definition and how I've defined
      them in my app
      
      API
      =====
      WTS_SESSION_INFO
      The WTS_SESSION_INFO structure contains information about a client session
      on a terminal server.
      typedef struct _WTS_SESSION_INFO { DWORD SessionId; LPTSTR
      pWinStationName; WTS_CONNECTSTATE_CLASS State;
      } WTS_SESSION_INFO, *PWTS_SESSION_INFO;
      
      WTSEnumerateSessions
      
      The WTSEnumerateSessions function retrieves a list of sessions on a
      specified terminal server.
      
      BOOL WTSEnumerateSessions(
      HANDLE hServer,
      DWORD Reserved,
      DWORD Version,
      PWTS_SESSION_INFO* ppSessionInfo,
      DWORD* pCount
      );
      
      =====
      
      And in my code
      ====
      <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
      Private Structure WTS_SESSION_INFO
      Dim SessionID As Int32 'DWORD integer
      Dim pWinStationName As String ' integer LPTSTR - Pointer to a
      null-terminated string containing the name of the WinStation for this
      session
      Dim State As WTS_CONNECTSTATE_CLASS
      End Structure
      
      <DllImport("wtsapi32.dll", _
      bestfitmapping:=True, _
      CallingConvention:=CallingConvention.StdCall, _
      CharSet:=CharSet.Auto, _
      EntryPoint:="WTSEnumerateSessions", _
      SetLastError:=True, _
      ThrowOnUnmappableChar:=True)> _
      Private Shared Function WTSEnumerateSessions2( _
      ByVal hServer As IntPtr, _
      <MarshalAs(UnmanagedType.U4)> _
      ByVal Reserved As Int32, _
      <MarshalAs(UnmanagedType.U4)> _
      ByVal Vesrion As Int32, _
      ByRef ppSessionInfo As IntPtr, _
      <MarshalAs(UnmanagedType.U4)> _
      ByRef pCount As Int32) As Int32
      End Function
      
      TIA
  - 6
    - Setting font for StaticText ControlHello,
      
      I'd like to set the size, fontname and color for one of my StaticText
      controls on my dialog on a Visual Studio 2005 C++ MFC native project.
      I've found out this control has a SetFont method(), which I presume enable
      to set the styles as I've mentioned above, but I've got a little confused
      about the parameters.
      
      Is the SetFont() method the right/best way for setting the font for the
      StaticText control?
      If so, how I could set this font from my dialog class?
      Do I have to set a member variable for the class for this purpose?
      Where is the best place to set the font? The MyDlg::OnInitDialog() ?
      
      Jeová
  - 7
    - How to handle nulls in a construcorHi, Im real new at this so be gentle. I want to create a customer
      object based on the results of an sql query to the customers table, ie
      one object per row, and then add each of these objects to an arraylist
      and then on to some datbinding in a listbox. Therefore, for each row
      sent back by the datareader, I try to create the new customer object
      and pass all the data in the row as part of the constructor. But, I
      declared the data fields in the customer class to be the same data type
      as those in the database but null causes a problem. To get round the
      problem, I just made addtional New constuctors for each column which
      may have nulls and then set the datfields to empty strings inside the
      constructor and thus not pass the null data at all from the datreader
      row. But that is a lot of kludge to test for null before the call to
      the constructor so that i call the right constructor. i tried to have
      constructors which accepts nulls as arguments and then set the private
      data fields to empty strings from there but ran in to cast problems
      *(esp with strict ON) in the call to the constructor.
      What is the right way to create objects whose private data fields are
      of one data type , but whose arguments might be null when they are
      instantiated and how should null arguments be specified.
  - 8
    - TOP SECRET MY MOM NEVER TOLD ME!!Discovers the "Secret of making huge money" in just few weeks....
      You shall be amazed that how easy 1 can make money on internet just for doing 1 time work..[I GUREENTED U CAN TOO MAKE BIG$$ WITH THIS PROGRAM]........
      [Use IE if can't view the site]
      http://mysiteinc.com/gohar/index.html
  - 9
    - Scirpt to disable a windows serviceHi...How can I stop and disable a windows service using vbscript?
      
      Here's what I have to stop it but how do I disable it???...
      
      Set WshShell=WScript.CreateObject("WScript.Shell")
      ServiceName = """Alerter"""
      Result = WshShell.Run("net stop " & ServiceName, 0, True)
  - 10
    - a strange question about throw in vc++,cannot throw __int64I cannot throw a number with type __int64,following is my code:
      
      void Print()
      {
      try
      {
      throw __int64(1);
      }
      catch(__int64)
      {
      //it can go here
      }
      
      //the program crashed when leaved from here
      }
      
      I can captured the exception,but the program crashed(access violation) when
      it leaved from the
      body of function Print.
  - 11
    - Bitmap Not DisplayedA bitmap that appears in the MFC dialog editor does not display when the
      application runs. The property settings and ID are the same in the VS 2003
      version and the VS 6 version. The VS 6 version works fine.
      
      It appears the update from VC++ 6 to VC++ 2003 has changed the mapping to
      the runtime bitmap file, but why does the bitmap picture appear (as it
      should) in the dialog editor, but not in the running version? The bitmap is
      labeled as a "system" bitmap, but this is a custom developed bitmap (lots of
      colors).
      
      Any clues to why the bitmap will not display and how to fix it?
      
      Thanks!
      --
      Dave Boyd
  - 12
    - SocketHow can I connect to smtp server?
      I tried to use CSocket:
      
      CSocket csk;
      csk.Create();
      csk.Connect("server.com", 25);
      
      but there is an error during connecting to server.com (function Connect
      return false)....
      
      Thx for help me
      ArtuS
  - 13
    - new invokes VirtualAllocHello everyone,
      
      On Windows, when we allocate large amount of memory, new will call
      VirtualAlloc directly, other than call HeapAlloc then through HeapAlloc call
      VirtualAlloc indirectly?
      
      Anyone to clarify this?
      
      thanks in advance,
      George
  - 14
    - invalid cast prob with oleDBdataReader...
      Dim rdr As OleDbDataReader = cmd.ExecuteReader
      If rdr.GetString(1).ToString.Length > 0 Then
      Console.WriteLine(rdr.GetString(1).ToString)
      End If
      
      The field is in an MS Access table that rdr is reading and
      is a text field. I am getting an invalid cast error when
      the field is null/empty.
      
      I have tried If Not IsDBNull(rdr.GetString(1).ToString)...
      
      still same problem. How can I trap if the field is null?
      
      Thanks
  - 15
    - MCSE 2003 Expiration?Well, Microsoft has released bunch of new track like MCPD and etc.
      
      But it seems that nothing equivalent of new MCSE has come up.
      
      So how long do you think new MCSE will come up? Will it be after the relase
      of Vista? Or should I just persue MCSE.
  - 16
    - Adding the rebooting code to the setup project !Hi EveryBody:
      
      Is there any way to add the rebooting code to the user interface of the setup project in VB.net ? if the answer is yes,how can I do it ?
      
      but if the answer is no, Is there any way to add dialog that I made by myself which consist of the rebooting code to the user inteface of the setup project ? if the answer is yes, how can I do it ?
      
      But if the answer is now, Is there any way to let my setup project rebooting after the installation is done?
      
      any help will be appreciated.
      
      al-ahmadi

MFC

hi,

i just started with vc7 with an MFC dialog box project. I added
some controls and attached variables... it worked out fine. I
don't know what happened but now every control I doubleclick
pops up the MFC Class Wizard. Right-clicking any control does
not show the ADD VARIABLE option anymore. The ClassView
does not show TestMFCDlg as a class anymore (the AboutDlg
class is there and I can add variables to it as well!)

Can somebody please tell me what went wrong?

IDE version: 7.0.9466

Thank you.

dtor

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  - 1
    - using swap to make assignment operator exception safeHello everyone,
      
      The following swap technique is used to make assignment operator exception
      safe (means even if there is exception, the current object instance's state
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      It used a temporary object "temp" in this sample, and assignment is made on
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      My question is, the pattern works only if there is no exception thrown by
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      [Code]
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      A& A::operator= (const A& a)
      {
      A temp;
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      return *this;
      }
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      setting the permissions to include Write, and copying the resulting .ASP
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      anything that involves writing to a file.
      I get a similar sort of error when trying to do it from Visual Interdev.
      I can't see what I'm doing wrong - can anyone point me in the right
      direction?
      I've tried using the P&D wizard to publish it to the server but it gave me a
      'no post info file found on server' message. I'm running XP pro
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      (BTW: I'm using VC6 with DirectX 8.0 SDK installed.)
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    - How to use ADO.NET in vbs file called from command line?I'm trying to run some ADO.NET code in a vbs file that is called from the
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      C:\CScript MyFile.vbs
      
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      do to use the .NET framework?
      
      Imports System.Data
      Imports System.Data.SqlClient
      Imports System.Data.SqlTypes
      
      Dim sqlConnection As SqlConnection = New SqlConnection()
      sqlConnection.ConnectionString =
      "SERVER=dbserver;DATABASE=mydb;UID=username;PWD=password"
      sqlConnection.Open()
      sqlConnection.Close()
  - 9
    - LVS_OWNERDATA and NM_CUSTOMDRAW with CListCtrl == slow?Forgive me if this is a near duplicate post... anyway, I'm trying to use
      NM_CUSTOMDRAW to draw all the items manually in a virtual CListCtrl (a list
      control with LVS_OWNERDATA). The problem is that my method is very slow and
      sluggish feeling compared to the way windows does it, and I don't know why.
      Keeping in mind that NM_CUSTOMDRAW is only fired once per item, due to the
      LVS_OWERDATA style, rather than once per sub item, perhaps someone can
      explain to me what I'm doing wrong? Heres the code:
      
      void CMusikPlaylistCtrl::OnLvnGetdispinfo(NMHDR *pNMHDR, LRESULT *pResult)
      {
      NMLVDISPINFO *pDispInfo = reinterpret_cast<NMLVDISPINFO*>(pNMHDR);
      
      // NM_CUSTOMDRAW will take care of drawing
      
      *pResult = 0;
      }
      
      void CMusikPlaylistCtrl::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult)
      {
      NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>( pNMHDR );
      
      *pResult = CDRF_DODEFAULT;
      
      if ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )
      *pResult = CDRF_NOTIFYITEMDRAW;
      
      else if ( CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage )
      {
      int iRow = (int)pLVCD->nmcd.dwItemSpec;
      
      CDC* pDC = CDC::FromHandle(pLVCD->nmcd.hdc);
      CRect item_rect;
      GetItemRect( iRow, &item_rect, LVIR_BOUNDS );
      
      DrawItem( pDC, iRow, item_rect ); // draw item [see below]
      *pResult = CDRF_SKIPDEFAULT;
      }
      
      else if( pLVCD->nmcd.dwDrawStage == CDDS_ITEMPOSTPAINT )
      *pResult = CDRF_DODEFAULT;
      }
      
      void CMusikPlaylistCtrl::DrawItem( CDC* pDC, int item, const CRect& rect )
      {
      CMemDC dc( pDC, &rect );
      
      // setup the font and highlight colors
      COLORREF bg = GetSysColor( COLOR_BTNHILIGHT );
      COLORREF text = GetSysColor( COLOR_WINDOWTEXT );
      
      // color each sub item
      CRect rcSubItem;
      dc.SetTextColor( text );
      for ( size_t i = 0; i < m_Prefs->GetPlaylistColCount(); i++ )
      {
      GetSubItemRect( item, i, LVIR_BOUNDS, rcSubItem );
      
      dc.FillSolidRect( &rcSubItem, bg );
      dc.TextOut( rcSubItem.left + 6, rcSubItem.top, _T( "Test" ) );
      }
      }
      
      Any suggestions or advice as to how to speed this up would be much
      appreciated. Thanks!
      
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  - 10
    - how passwords should be stored under windowsHi, I have a project which needs me to store passwords
      under windows, I just wondering how those passwords should
      be stored. For example, if I store in the registry, is
      there any encription tool I can use so that only my
      program can read and write it?
  - 11
    - What is returned?Why does one work and not the other?
      
      Does Work:
      ::MessageBox(::GetActiveWindow(),CString((test = "Hello")) +
      CString((test = "Hi")),"IDS_STRING102",MB_OK);
      
      Does NOT work:
      ::MessageBox(::GetActiveWindow(),CString((test = "Hello",test)) +
      CString((test = "Hi",test)),"IDS_STRING102",MB_OK);
      
      Reason:
      I wanted this macro to work:
      #define GETRESOURCESTRING(iResID, out_CStringRef) CString((
      VERIFY(out_CStringRef.LoadString(iResID)), (out_CStringRef) ))
      
      ...but as it stands, if you make the call:
      
      CString test;
      ::MessageBox(::GetActiveWindow(),GETRESOURCESTRING(IDS_STRING102,test)
      + GETRESOURCESTRING(IDS_ABOUTBOX,test),"IDS_STRING102",MB_OK);
      
      ...its fails. It only works if you have two distinct strings:
      
      CString test, test2;
      ::MessageBox(::GetActiveWindow(),GETRESOURCESTRING(IDS_STRING102,test)
      + GETRESOURCESTRING(IDS_ABOUTBOX,test2),"IDS_STRING102",MB_OK);
      
      I guess I was under the impression that there would have been two
      distinct CStrings on the stack that would have recieved their value
      from "test" at two distinct times where test equaled two different
      things...?
      
      Apparently clueless,
      BuddyLeeJr
  - 12
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      then it works. However, when do the same on a new form in my existing
      solution then I get following error. Could there be some global
      settings in my application that are causing problems?
      
      Thanks in advance,
      
      -Dave
      
      Error:
      -----------------------------------------------
      An unhandled exception of type 'System.Net.WebException' occurred in
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      Additional information: An exception occurred during a WebClient
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      Sample Code:
      -----------------------------------------------
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