Mainfrm - C / C++ / MFC Discussion Boards

Mohammd Bilal19-Nov-06 21:08

19-Nov-06 21:08

Hi,
I have a question regarding serial I/O.
...
I have been programming in MFC to interface Serial Ports
in Windows NT in order to read/write them in Overlapped as well as
in non-overlapped mode.
...
It worked fine all the time.
...
But I have a question regarding serial port.
...
That,
1) I open COM1 port in non-overlapped (Blocking I/O) mode
2) I Create a seprate thread, in which I attemp to read five Characters.
using "ReadFile" function.
3) Now, this function will not return unless I get all the five Characters
(As I have forced the "Read Timeouts" and "Write Timeouts" in
COMMTIMEOUTS structure to zeros)
4) But in case if I want to abort without further waiting for the arrival
of characters, I would have to abort the thread "Pre-matureally" ...
5) How can I do this, since the thread is simply blocked in waiting for
characters, as the "ReadFile" function has still not returned.
6) The application window closes, but the Thread keeps on running behind.

...
Basically I want my thread to terminate alongwith when application terminates.
But I dont get it through...
...
I will be very thankful for your assistance ...

...

Re: Serial I/O in Non-Overlapped mode ....

Roger Stoltz19-Nov-06 21:36

Roger Stoltz

19-Nov-06 21:36

There are only two ways for a call to ::ReadFile() on a serial device to return when opened in non-overlapped mode:

1. the device has received the number of bytes you wanted to read
2. there was a timeout due to the COMMTIMEOUTS settings, either there was too much time between two consecutive bytes or the whole operation took too much time to complete

There is no way to get passed this because this is how the system works.
It would be tempting to look at ::CancelIo(), but it can only be used in overlapped mode and by the thread that issued the read request.

--
Roger

"It's supposed to be hard, otherwise anybody could do it!" - selfquote

"No one remembers a coward!" - Jan Elfström 1998
"...but everyone remembers an idiot!" - my lawyer 2005 when heard of Jan's saying above

Re: Serial I/O in Non-Overlapped mode ....

CPallini20-Nov-06 2:24

CPallini

20-Nov-06 2:24

Abruptly, you can call the TerminateThread from the main thread.
Or (better) you can handle all that stuff using OVERLAPPED I/O.

How to draw the window border by myself ?

samfromcn19-Nov-06 21:08

samfromcn

19-Nov-06 21:08

When I use Adobe PhotoShop's Crop Tool. It creates a subwindow helping me to select image scope. The subwindow attract me for its frame line looks moving. And I hope that there will be such a window in my application.

anyone can help me ? Laugh | :laugh:

How to get mouse selected text? thanks ...

tiaozi19-Nov-06 20:46

tiaozi

19-Nov-06 20:46

when we use mouse to select some text on windows?

for example, we select some text in notepad application

i want to get the current selected text,

I does not want to simulate ctrl+c hotkey to copy data to clipboard(read data from clipboard),

i think this is very foolish, Smile | :)

I want to known whether some COM interface for us to use??? thanks again..

Re: How to get mouse selected text? thanks ...

Rajesh R Subramanian19-Nov-06 23:20

Rajesh R Subramanian

19-Nov-06 23:20

Not sure. But see if GetWindowText() is going to be of any use.

Nobody can give you wiser advice than yourself. - Cicero

childfrm

Programm3r20-Nov-06 4:47

Programm3r

20-Nov-06 4:47

MSDN:

CHILDFRM

<br />
// ChildFrm.cpp : implementation of the CChildFrame class<br />
//<br />
// This is a part of the Microsoft Foundation Classes C++ library.<br />
// Copyright (C) 1992-1998 Microsoft Corporation<br />
// All rights reserved.<br />
//<br />
// This source code is only intended as a supplement to the<br />
// Microsoft Foundation Classes Reference and related<br />
// electronic documentation provided with the library.<br />
// See these sources for detailed information regarding the<br />
// Microsoft Foundation Classes product.<br />
<br />
#include "stdafx.h"<br />
#include "Scribble.h"<br />
<br />
#include "ChildFrm.h"<br />
<br />
#ifdef _DEBUG<br />
#define new DEBUG_NEW<br />
#undef THIS_FILE<br />
static char THIS_FILE[] = __FILE__;<br />
#endif<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CChildFrame<br />
<br />
IMPLEMENT_DYNCREATE(CChildFrame, CMDIChildWnd)<br />
<br />
BEGIN_MESSAGE_MAP(CChildFrame, CMDIChildWnd)<br />
	//{{AFX_MSG_MAP(CChildFrame)<br />
		// NOTE - the ClassWizard will add and remove mapping macros here.<br />
		//    DO NOT EDIT what you see in these blocks of generated code !<br />
	//}}AFX_MSG_MAP<br />
END_MESSAGE_MAP()<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CChildFrame construction/destruction<br />
<br />
CChildFrame::CChildFrame()<br />
{<br />
	// TODO: add member initialization code here<br />
<br />
}<br />
<br />
CChildFrame::~CChildFrame()<br />
{<br />
}<br />
<br />
BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)<br />
{<br />
	// TODO: Modify the Window class or styles here by modifying<br />
	//  the CREATESTRUCT cs<br />
<br />
	return CMDIChildWnd::PreCreateWindow(cs);<br />
}<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CChildFrame diagnostics<br />
<br />
#ifdef _DEBUG<br />
void CChildFrame::AssertValid() const<br />
{<br />
	CMDIChildWnd::AssertValid();<br />
}<br />
<br />
void CChildFrame::Dump(CDumpContext& dc) const<br />
{<br />
	CMDIChildWnd::Dump(dc);<br />
}<br />
<br />
#endif //_DEBUG<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CChildFrame message handlers<br />
<br />
// HEADER<br />
// ChildFrm.h : interface of the CChildFrame class<br />
//<br />
// This is a part of the Microsoft Foundation Classes C++ library.<br />
// Copyright (C) 1992-1998 Microsoft Corporation<br />
// All rights reserved.<br />
//<br />
// This source code is only intended as a supplement to the<br />
// Microsoft Foundation Classes Reference and related<br />
// electronic documentation provided with the library.<br />
// See these sources for detailed information regarding the<br />
// Microsoft Foundation Classes product.<br />
/////////////////////////////////////////////////////////////////////////////<br />
<br />
class CChildFrame : public CMDIChildWnd<br />
{<br />
	DECLARE_DYNCREATE(CChildFrame)<br />
public:<br />
	CChildFrame();<br />
<br />
// Attributes<br />
public:<br />
<br />
// Operations<br />
public:<br />
<br />
// Overrides<br />
	// ClassWizard generated virtual function overrides<br />
	//{{AFX_VIRTUAL(CChildFrame)<br />
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);<br />
	//}}AFX_VIRTUAL<br />
<br />
// Implementation<br />
public:<br />
	virtual ~CChildFrame();<br />
#ifdef _DEBUG<br />
	virtual void AssertValid() const;<br />
	virtual void Dump(CDumpContext& dc) const;<br />
#endif<br />
<br />
// Generated message map functions<br />
protected:<br />
	//{{AFX_MSG(CChildFrame)<br />
		// NOTE - the ClassWizard will add and remove member functions here.<br />
		//    DO NOT EDIT what you see in these blocks of generated code!<br />
	//}}AFX_MSG<br />
	DECLARE_MESSAGE_MAP()<br />
};<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />

I really hope this helps Smile | :)

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r

Mainfrm

Programm3r20-Nov-06 4:48

Programm3r

20-Nov-06 4:48

MAINFRM

<br />
// MainFrm.cpp : implementation of the CMainFrame class<br />
//<br />
// This is a part of the Microsoft Foundation Classes C++ library.<br />
// Copyright (C) 1992-1998 Microsoft Corporation<br />
// All rights reserved.<br />
//<br />
// This source code is only intended as a supplement to the<br />
// Microsoft Foundation Classes Reference and related<br />
// electronic documentation provided with the library.<br />
// See these sources for detailed information regarding the<br />
// Microsoft Foundation Classes product.<br />
<br />
#include "stdafx.h"<br />
#include "Scribble.h"<br />
<br />
#include "MainFrm.h"<br />
<br />
#ifdef _DEBUG<br />
#define new DEBUG_NEW<br />
#undef THIS_FILE<br />
static char THIS_FILE[] = __FILE__;<br />
#endif<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CMainFrame<br />
<br />
IMPLEMENT_DYNAMIC(CMainFrame, CMDIFrameWnd)<br />
<br />
BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWnd)<br />
	//{{AFX_MSG_MAP(CMainFrame)<br />
		// NOTE - the ClassWizard will add and remove mapping macros here.<br />
		//    DO NOT EDIT what you see in these blocks of generated code !<br />
	ON_WM_CREATE()<br />
	//}}AFX_MSG_MAP<br />
END_MESSAGE_MAP()<br />
<br />
static UINT indicators[] =<br />
{<br />
	ID_SEPARATOR,           // status line indicator<br />
	ID_INDICATOR_CAPS,<br />
	ID_INDICATOR_NUM,<br />
	ID_INDICATOR_SCRL,<br />
};<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CMainFrame construction/destruction<br />
<br />
CMainFrame::CMainFrame()<br />
{<br />
	// TODO: add member initialization code here<br />
<br />
}<br />
<br />
CMainFrame::~CMainFrame()<br />
{<br />
}<br />
<br />
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)<br />
{<br />
	if (CMDIFrameWnd::OnCreate(lpCreateStruct) == -1)<br />
		return -1;<br />
<br />
	if (!m_wndToolBar.Create(this) ||<br />
		!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))<br />
	{<br />
		TRACE0("Failed to create toolbar\n");<br />
		return -1;      // fail to create<br />
	}<br />
<br />
	if (!m_wndStatusBar.Create(this) ||<br />
		!m_wndStatusBar.SetIndicators(indicators,<br />
		  sizeof(indicators)/sizeof(UINT)))<br />
	{<br />
		TRACE0("Failed to create status bar\n");<br />
		return -1;      // fail to create<br />
	}<br />
<br />
	// TODO: Remove this if you don't want tool tips<br />
	m_wndToolBar.SetBarStyle(m_wndToolBar.GetBarStyle() |<br />
		CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC);<br />
<br />
	// TODO: Delete these three lines if you don't want the toolbar to<br />
	//  be dockable<br />
	m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);<br />
	EnableDocking(CBRS_ALIGN_ANY);<br />
	DockControlBar(&m_wndToolBar);<br />
<br />
<br />
	return 0;<br />
}<br />
<br />
BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)<br />
{<br />
	// TODO: Modify the Window class or styles here by modifying<br />
	//  the CREATESTRUCT cs<br />
<br />
	return CMDIFrameWnd::PreCreateWindow(cs);<br />
}<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CMainFrame diagnostics<br />
<br />
#ifdef _DEBUG<br />
void CMainFrame::AssertValid() const<br />
{<br />
	CMDIFrameWnd::AssertValid();<br />
}<br />
<br />
void CMainFrame::Dump(CDumpContext& dc) const<br />
{<br />
	CMDIFrameWnd::Dump(dc);<br />
}<br />
<br />
#endif //_DEBUG<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CMainFrame message handlers<br />
<br />
// HEADER //<br />
// MainFrm.h : interface of the CMainFrame class<br />
//<br />
// This is a part of the Microsoft Foundation Classes C++ library.<br />
// Copyright (C) 1992-1998 Microsoft Corporation<br />
// All rights reserved.<br />
//<br />
// This source code is only intended as a supplement to the<br />
// Microsoft Foundation Classes Reference and related<br />
// electronic documentation provided with the library.<br />
// See these sources for detailed information regarding the<br />
// Microsoft Foundation Classes product.<br />
/////////////////////////////////////////////////////////////////////////////<br />
<br />
class CMainFrame : public CMDIFrameWnd<br />
{<br />
	DECLARE_DYNAMIC(CMainFrame)<br />
public:<br />
	CMainFrame();<br />
<br />
// Attributes<br />
public:<br />
<br />
// Operations<br />
public:<br />
<br />
// Overrides<br />
	// ClassWizard generated virtual function overrides<br />
	//{{AFX_VIRTUAL(CMainFrame)<br />
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);<br />
	//}}AFX_VIRTUAL<br />
<br />
// Implementation<br />
public:<br />
	virtual ~CMainFrame();<br />
#ifdef _DEBUG<br />
	virtual void AssertValid() const;<br />
	virtual void Dump(CDumpContext& dc) const;<br />
#endif<br />
<br />
protected:  // control bar embedded members<br />
	CStatusBar  m_wndStatusBar;<br />
	CToolBar    m_wndToolBar;<br />
<br />
// Generated message map functions<br />
protected:<br />
	//{{AFX_MSG(CMainFrame)<br />
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);<br />
		// NOTE - the ClassWizard will add and remove member functions here.<br />
		//    DO NOT EDIT what you see in these blocks of generated code!<br />
	//}}AFX_MSG<br />
	DECLARE_MESSAGE_MAP()<br />
};<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r

set transparent to slidercontrol background...

klvin19-Nov-06 19:53

klvin

19-Nov-06 19:53

Hi!!

I am using slider control in my application.
I set JPG image as background for my dialog using CXImage.
How Can I set transparent to slider control background.

Can anyone please give me the solution for this...

Thanks&Regards,
klvin

Re: set transparent to slidercontrol background...

prasad_som19-Nov-06 20:09

prasad_som

19-Nov-06 20:09

Can you try this ?

HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
  HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

  if (CTLCOLOR_SCROLLBAR   == nCtlColor)
  {
    pDC->SetBkMode(TRANSPARENT);
  }
  return hbr;
}

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: set transparent to slidercontrol background...

klvin20-Nov-06 1:22

klvin

20-Nov-06 1:22

Hi !!
Thanks for the reply.

I tried with OnCtlColor(...)
But,It is not working.

klvin.

c++ constructor

Swetha Desai19-Nov-06 19:00

Swetha Desai

19-Nov-06 19:00

Why the constructor, destructor and copy constructor in c++ are not able to inherit by the derived class. And what else cannot be inherited from the derived class

Re: c++ constructor

Parthi_Appu19-Nov-06 19:46

Parthi_Appu

19-Nov-06 19:46

Seems you are new to OOPs... stydy something(books, web page...) to know basic of OOP.

Do your Duty and Don't expect the Result

Re: c++ constructor

tiaozi19-Nov-06 20:48

tiaozi

19-Nov-06 20:48

it;s no necessary... Smile | :)

How I can resize the web page size in Microsoft web browser?

Sameer_Thakur19-Nov-06 18:58

Sameer_Thakur

19-Nov-06 18:58

Hi all.

I am using a Microsoft web browser to show the preview of web pages available in my application. This web browser is a part of a Modal Dialog box. I am loading those html pages from the specific location.

As this web browser control is a part of dialog box I can't make its size too big to show complete web page. As a result when I load the html page in it, the scroll bars appears for browser control.

What I want is to resize my html pages according to the size of the browser control so that user will not be required to scroll to have a complete view of the web page.

So how can I resize the html pages before loading them in the browser control?
OR
Is there any other way to do this?

Thanks

Rakesh Thakur

Re: How I can resize the web page size in Microsoft web browser?

Parthi_Appu19-Nov-06 19:44

Parthi_Appu

19-Nov-06 19:44

Rakesh_Thakur wrote:
I am loading those html pages from the specific location

Since you are loading a page, i think its not possible to avoid the scroll bars. Other wise you modal dialog has to be resized.
(OR)
If you have the web page details as image file, you can resize the image.

Do your Duty and Don't expect the Result

Writing an iterator for your class

HondaCBR60019-Nov-06 18:29

HondaCBR600

19-Nov-06 18:29

Hi.

Can anyone give me a simple example of how to create an iterator for one of your own classes?

I have a binary Search Tree ADT (BST.cpp) that can insert, delete and traverse the binary search tree in sorted order.

The inorder traversal should use the operators from the STL bidirectional iterator.

My BST should provide appropriate, efficient iterators that can be given to any of the STL generic algorithms. My BST should look and feel like an object not just a wrapper around existing C code.

Any hints or small examples that can help me out, will be greatly appreciated.

Thanks.

Re: Writing an iterator for your class

Sceptic Mole19-Nov-06 22:14

Sceptic Mole

19-Nov-06 22:14

Take Advantage of STL Algorithms by Implementing a Custom Iterator[^]

setfocus not working

prithaa19-Nov-06 17:21

prithaa

19-Nov-06 17:21

Hello,

Edit is derived from class CEdit

int i=0;
vector<Edit*>R;
Edit *p;
p = R[i];
p->SetFocus();

I want to move from one edit box to another which I am able to do.I go from one edit box to another by i++ or i-- depending on the key pressed.and calling the function
R[i]->SetFocus();

But when I click the mouse I am not able to move the focus to the clicked edit box.How should I do it?
In what way should I define a pointer so that I acheive the move ?

Prithaa

Re: setfocus not working

Parthi_Appu19-Nov-06 17:25

Parthi_Appu

19-Nov-06 17:25

prithaa wrote:
when I click the mouse I am not able to move the focus to the clicked edit box.How should I do it?

the edit box will get its focus automatically.. there is nothing special to set its focus while clicking on it...

Do your Duty and Don't expect the Result

Re: setfocus not working

toxcct20-Nov-06 0:50

toxcct

20-Nov-06 0:50

can't you use the tab key to navigate through the controls ?

You don't know where to start ? ask a good friend

[VisualCalc 3.0][Flags Beginner's Guide]

Re: setfocus not working

Mark Salsbery20-Nov-06 6:53

Mark Salsbery

20-Nov-06 6:53

Are the edit controls on a dialog? If so, you should use something like this to properly
move focus to the control:

int i=0;
vector<edit*>R;
Edit *p;
p = R[i];
GotoDlgCtrl(p);

prithaa wrote:
But when I click the mouse I am not able to move the focus to the clicked edit box.How should I do it?

You shouldn't have to do this yourself. When you click in the edit box do you get the caret?
If so, then it has the focus. If you are trying to set the focus yourself on a mouse click
then you may be preventing it from getting focus.

Mark

How do I access a c# class from vc++?

malayalite19-Nov-06 16:08

malayalite

19-Nov-06 16:08

I have a class that I wrote I C# and I want to use it in a VC++ project without turning the C# class into a COM object. These are the steps that I've been given by a colleague:
I don't have code sample but I have steps how to do it. But my problem is how do I do step 9? Does anyone have a code sample of how to access the C# methods in VC++ through a type library??

Much appreciated!

L

1. Create a C# class
2. Generate a key for it - sn -k keyfile.snk
3. Put an assembly directive at top of file
[(Assembly: AssemblyKeyFile("keyfile.snk")]
4. Compile
5. regasm file.dll /tlb to generate the COM Type Library
6. gacutil -i file.dll to place file in GAC
7. Copy the generated typelibraries into the directory of your ATL/C++ project
8. #import file.tlb no_namespaces named_guids (look up the reff for exact syntax)
9. Compile ATL/C++ code and you will have access to the interfaces through the types in the imported tlb

Re: How do I access a c# class from vc++?

Christian Graus19-Nov-06 17:00

Christian Graus

19-Nov-06 17:00

Step 9 is just accessing the C# calls as if they were any COM object. They have nothing to do with C#.

So long as your project depends on the .NET framework, turning on C++/CLI or Managed C++ seems a more sensible and easier option to me.

Christian Graus - C++ MVP

Re: How do I access a c# class from vc++?

malayalite19-Nov-06 18:27

malayalite

19-Nov-06 18:27

Actually I'm going to have to use this C++ dll as a 'bridge'. I'm going to have to use it to implement an abstract interface defined outside managed code, and make calls to the managed C# dll to call certain methods to help the 'bridge' implement the interface.

What is the actual syntax of it? I'm having some trouble finding examples.

Sorry if any of these questions are ignorant, I'm a newbie to C++/COM programming.

If I were to access the C# methods as any COM object would I need to use cocreateinstance?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.