C / C++ / MFC

http://www.codeproject.com/cpp/avoidmultinstance.asp[^]

16-Dec-02 0:51

There are a number of ways to do this, a named mutex is the most common. The name for this is a singleton, if you search this site or google for the word 'singleton' I reckon you'll find heaps of examples.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: C runtime processing

Jeff J16-Dec-02 0:58

Jeff J

16-Dec-02 0:58

HELP!?

User 665816-Dec-02 2:21

User 6658

16-Dec-02 2:21

Can someone tell me why I can't edit my message? I'm logged in, but the board wants a password in order to delete/modify the message. However, it says that the password is incorrect, and it doesn't get sent by mail if I click on "I forgot my password" Confused | :confused:

Help

modified 12-Sep-18 21:01pm.

illegal operation

ArunKGoyal15-Dec-02 22:37

ArunKGoyal

15-Dec-02 22:37

I have developed a MFC application for some equipment. The interface between my application and equipment is through serial COM port. Now problem is like this, whenever I starts the application and one dialog box appears to choose the COM port(there are two ports in one PC). If I clicks on the caption bar of that dialog box by mouse, than it displays a message box showing illegal operation and I have to close the application. Suggest me what can be the problem with my application ?
Otherwise my application is working fine.
Thanks.

Arun

Christian Graus15-Dec-02 22:53

15-Dec-02 22:53

Build a debug version, enter the debugger when it crashes, and you'll see where the problem is.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

ArunKGoyal15-Dec-02 23:22

ArunKGoyal

15-Dec-02 23:22

I am running the debug version already......
But there is no Retry or Debug button onth illigal message box.

Daniel Strigl15-Dec-02 23:59

Daniel Strigl

15-Dec-02 23:59

Show us the source code of the dialog where you choose the serial port ...

Daniel Wink | ;)

---------------------------
Never change a running system!

ArunKGoyal16-Dec-02 0:30

ArunKGoyal

16-Dec-02 0:30

Although this problem is not consistent.

the cpp file is :

// ProtComPortDlg.cpp : implementation file
//

#include "stdafx.h"
#include "FasGui.h"
#include "ProtComPortDlg.h"
#include "MainFrm.h"

#include "Music.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

bool CProtComPortDlg::bFasBmpFlag;
/////////////////////////////////////////////////////////////////////////////
// CProtComPortDlg dialog

CProtComPortDlg::CProtComPortDlg(CWnd* pParent /*=NULL*/)
: CDialog(CProtComPortDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CProtComPortDlg)
m_nComPort1 = 1;
m_strPortSystemName = _T("Fas");
//}}AFX_DATA_INIT
}

void CProtComPortDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CProtComPortDlg)
DDX_Radio(pDX, IDC_PORTCOM1, m_nComPort1);
DDX_Text(pDX, IDC_PORTSYSTEMNAME, m_strPortSystemName);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CProtComPortDlg, CDialog)
//{{AFX_MSG_MAP(CProtComPortDlg)
ON_WM_SETCURSOR()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CProtComPortDlg message handlers

BOOL CProtComPortDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// TODO: Add extra initialization here
SetIcon(AfxGetApp()->LoadIcon(IDR_MAIN),FALSE);

return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}

void CProtComPortDlg::OnCancel()
{
// TODO: Add extra cleanup here

CMusic MusicObj;
strSong = "Utopia.wav";
MusicObj.PlayMusic();

if(AfxMessageBox("This will terminate the application\nContinue with termination...",MB_YESNO|MB_ICONQUESTION) == IDYES)
{
PostQuitMessage(NULL);
}
//CDialog::OnCancel();
}

BOOL CProtComPortDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
// TODO: Add your message handler code here and/or call default
::SetCursor(::LoadCursor(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDC_CDOT)));
return TRUE;

// return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

I am calling the DoModal() of this class in MainFrm.cpp as:

if(ProtComPortDlgObj.DoModal()==IDOK)
{
//some processing
}

bye

PreTranslateMessage Problem???

Daniel Strigl16-Dec-02 1:09

Daniel Strigl

16-Dec-02 1:09

Maybe the line ::SetCursor(::LoadCursor(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDC_CDOT))); in the function BOOL CProtComPortDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) function produce the error ?!?!

Daniel Wink | ;)

---------------------------
Never change a running system!

Lizp15-Dec-02 22:20

Lizp

15-Dec-02 22:20

I have a moduless dialog which has WS_CHILD property in a dll and used as an child in a view. when the dialog has focus ,it look the accelerator key massage as a dialog message and does not pass to it's parent(the view),while my purpose is that it should route the msg to the view and the dispatch to any it's child.Please tell me how to achieve this.
some presetive code goes:
In the view class:

<br />
BOOL CTestAccelView::PreTranslateMessage(MSG* pMsg) <br />
{<br />
  if(TranslateAccelerator(m_hWnd,m_hAccelTest,pMsg))<br />
    return TRUE;<br />
  if(m_pTestDlgWnd && m_pTestDlgWnd->GetSafeHwnd() )<br />
    if(m_pTestDlgWnd->PreTranslateMessage(pMsg))<br />
	return TRUE;<br />
  if(m_pTestDlgWnd2 && m_pTestDlgWnd2->GetSafeHwnd())<br />
    if(m_pTestDlgWnd2->PreTranslateMessage(pMsg))<br />
	return TRUE;<br />
  return CView::PreTranslateMessage(pMsg);<br />
}<br />

In the Dialog class:

<br />
BOOL CTestDlg::PreTranslateMessage(MSG* pMsg) <br />
{<br />
   if(TranslateAccelerator(m_hWnd,m_hAccelTest,pMsg))<br />
   {<br />
      return TRUE;<br />
   }<br />
   if(IsDialogMessage(pMsg))<br />
   {<br />
     return TRUE;<br />
   }<br />
   return CWnd::PreTranslateMessage(pMsg);<br />
}<br />

Scratch

interesting problem, easy way??

Sunnygirl15-Dec-02 21:26

15-Dec-02 21:26

hello @all,

i posted this message yesterday in this forum and i got much assistance, however give it another and easier way, without THEADS.!!

i have a dialogbased program.
there a two buttons (eg. button1 and button2).
if i press button1 first i get a new dialog (ID_DIALOG_COMBO) with a combobox (m_ctrlComboBox).
if i press the button2 a CString (CString mystring) should be enterd into the combobox from the ID_DIALOG_COMBO.

how can i do this????
thank you very much

this is only an example, to explain the real background would be take to much time

sunny

Christian Graus15-Dec-02 21:34

15-Dec-02 21:34

The dialog needs to be modeless, end of story. Someone said that to you yesterday and it's all you need. Once you have a modeless dialog, then you can still press the second button while the dialog is up, and you can create a method on the modeless dialog which takes your string and enters it into your combo box. Call that method when button two is pressed, and you're done.

People suggested you need *threads* to do this ?

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Sunnygirl15-Dec-02 22:29

15-Dec-02 22:29

thanks for reply.

Christian Graus wrote:
The dialog needs to be modeless

i have modeless dialogs!!!

Christian Graus wrote:
you can create a method on the modeless dialog which takes your string and enters it into your combo box

that is, what i mean! how can i do this? how should the method look like? Confused | :confused:

thanks
sunny

Christian Graus15-Dec-02 22:29

15-Dec-02 22:29

public:
void PassText(CString s);

void MyModelessDialog::PassText(CString s)
{
MyComboBox.SetWindowText(s);
}

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Sunnygirl15-Dec-02 22:49

15-Dec-02 22:49

i´m sorry, i do not understand this code example! can i use it in mfc???

thank you very much

sunny

Christian Graus15-Dec-02 23:03

15-Dec-02 23:03

I'm sorry, but I think you probably need to go back to C++ without MFC, or Windows of any kind, if you do not understand this. That is a friendly suggestion, not an insult.

To put text into the edit area of a combobox, you call it's SetWindowText method. That is an MFC method, and it requires that you've created a variable of type CComboBox in your modeless dialog box. The rest of the function is basic C++, I showed the declaration ( the bit in the .h file ) to show it needs to not be private ( that is not actually true, but it's the simplest way ), and the definition, where all we do is take the string and shove it into the combo box. You then call that method on the combo box in the method the class wizard defines for you for when you push button 2.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Sunnygirl15-Dec-02 23:25

15-Dec-02 23:25

Christian Graus wrote:
I'm sorry, but I think you probably need to go back to C++ without MFC, or Windows of any kind, if you do not understand this. That is a friendly suggestion, not an insult.

that or i should go to bed earlier. i believes my brain is still sleeping.

first, i will try to go to bed more earlier. Wink | ;)

;);)

thanks for your reply! i think your idea is perfekt and i will try it.

sunny
Rose | [Rose]

Christian Graus16-Dec-02 0:52