C / C++ / MFC

2-Jul-12 21:36

1. Abstract classes and Interfaces are basic building blocks of the language, they have nothing to do with real-time or any other type of application, in the sense you are asking about.
2. See this discussion[^] from Microsoft.

Re: Strange compiler output

Strange compiler output

ForNow2-Jul-12 17:50

ForNow

2-Jul-12 17:50

Hi,

I have loop in my code which I try to execute 4 times I have tried a for statment
while statement nothing seems to work

going into assembly mode the compiler doesn't seem to have generated the right code

if tried a for loop

C++

while but the compiler generates a compare for a 1 instead of 4
  

 <pre lang="cpp">249:        while(i < 4)

ASM

0137149F  mov         dword ptr [ebp-14h],0
013714A6  mov         dword ptr [ebp-10h],2AFFh
013714AD  jmp         CHERC_CMDApp::InitInstance+341h (13714C1h)
013714AF  mov         ecx,dword ptr [ebp-10h]
013714B2  add         ecx,1
013714B5  mov         dword ptr [ebp-10h],ecx
013714B8  mov         edx,dword ptr [ebp-14h]
013714BB  add         edx,1
013714BE  mov         dword ptr [ebp-14h],edx
013714C1  cmp         dword ptr [ebp-14h],1   <===
013714C5  jae         013715BA
   250:

«_Superman_»2-Jul-12 20:53

«_Superman_»

2-Jul-12 20:53

Please post the code for the entire loop.
There must be something wrong with the loop.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Strange compiler output

ForNow3-Jul-12 2:46

ForNow

3-Jul-12 2:46

I re-compiled and the loop seems to be working however I got another exception

for which I'll start another thread a little later as I amy need your help

Thanks

How to configure GTK+ in CodeBlocks?

atoi_powered2-Jul-12 4:07

atoi_powered

2-Jul-12 4:07

Hi, how could I use GTK+ in CodeBlocks?

Re: How to configure GTK+ in CodeBlocks?

Richard MacCutchan2-Jul-12 6:41

2-Jul-12 6:41

Start with this[^].

[solved] CDialog Goes Blank When Press ENTER

AmbiguousName2-Jul-12 0:32

AmbiguousName

2-Jul-12 0:32

hello guys... I have this 4 tabbed program and I am relatively new to MFC so don't know what exactly is happening. When I press Enter on Tab1, the the whole tab page goes blank. When I select Tab2 and come back to Tab1, it becomes alright.
So the question is why does the dialog goes blank and what should I do to prevent this? Thnks

This world is going to explode due to international politics, SOON.

modified 2-Jul-12 7:16am.

Re: CDialog Goes Blank When Press ENTER

Code-o-mat2-Jul-12 1:03

Code-o-mat

2-Jul-12 1:03

Are your tabs also derived from CDialog?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Re: CDialog Goes Blank When Press ENTER

AmbiguousName2-Jul-12 1:18

AmbiguousName

2-Jul-12 1:18

Yes. But it is solved now. I just overrided OnOK() and OnCancel() in each tab. Thanks for showing interest.

This world is going to explode due to international politics, SOON.

Re: CDialog Goes Blank When Press ENTER

Code-o-mat2-Jul-12 1:34

Code-o-mat

2-Jul-12 1:34

That's what would have been my suggestion...yourwelcome for the interest. Smile | :)

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Bios Bootable software

Brandon-X120001-Jul-12 21:28

Brandon-X12000

1-Jul-12 21:28

Hello all,

I would like to know of any software, books or resources I could use to create a software you can boot from the BIOS (basic input-output system), like (1.) you turn on your computer pressing the power button. (2.) You hit the F8 key, (3.) you select boot from CD or from USB [or any other media] (3.) you select the software from what the computer detects and BAM! your software is loading. Something like that.

I've heard of using .img, .lst and just plain files (files without extensions), just like "KonBoot" does (just three simple files).

Simple Thanks and Regards,
Brandon T. H.

Programming in C and C++ now, now developing applications, services and drivers (and maybe some kernel modules...psst kernel-mode drivers...psst).

Many of life's failures are people who did not realize how close they were to success when they gave up. - Thomas Edison

Re: Bios Bootable software

Richard MacCutchan1-Jul-12 22:22

1-Jul-12 22:22

Brandon T. H. wrote:
I would like to know of any software, books or resources

There are some articles[^] here on CodeProject that discuss building your own OS; no doubt they will contain sections on bootstrapping. You can also use Google which will probably have thousands of references.

need help: image coordinates(x,y) in opencv with mfc Pin

jawadali4771-Jul-12 19:40

Re: need help: image coordinates(x,y) in opencv with mfc Pin

1-Jul-12 19:40

hi,
below is the complete code that i have developed using opencv with MFC in vs2008. it builds fine and after debugging it shows two different windows, one containing image and other containing static boxes. the purpose of this code is to display image coordinates (x,y) in static boxes but when i double click on the image window (which is my mouse event), values of (x,y) coordinates are not displayed in the static boxes (static boxes are in the separate window). please pardon my mistakes.

#include "stdafx.h"
#include "opencv01.h"
#include "opencv01Dlg.h"
#include "highgui.h"
#include "afxwin.h"
#include "cv.h"
#include "math.h"
#include<stdlib.h>
 
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
 
void on_mouse( int evt, int x, int y, int flags, void* param );    //defining mouse event
HWND hwnd;   //defining handle
 
class CAboutDlg : public CDialog
{
public:
	CAboutDlg();
 
	enum { IDD = IDD_ABOUTBOX };
 
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
 
protected:
	DECLARE_MESSAGE_MAP()
};
 
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}
 
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}
 
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()
 
Copencv01Dlg::Copencv01Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(Copencv01Dlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
 
void Copencv01Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}
 
BEGIN_MESSAGE_MAP(Copencv01Dlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
 

// Copencv01Dlg message handlers
 
BOOL Copencv01Dlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);
 
	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}
 
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
 
	
	AfxBeginThread(MyThreadProc, this); //calling thread
 
	return TRUE;  // return TRUE  unless you set the focus to a control
}
 

UINT Copencv01Dlg::MyThreadProc(LPVOID pParam)
    {
     Copencv01Dlg * me = (Copencv01Dlg *)pParam;
     me->MyThreadProc();
     return TRUE;
    }
 

void Copencv01Dlg::MyThreadProc()
{ 
	//image initialization
	
	IplImage* img = cvLoadImage("box.png", CV_WINDOW_AUTOSIZE);
		cvNamedWindow("map", 0);
		cvShowImage("map", img);
 
                cvSetMouseCallback("map", on_mouse, NULL);     //calling mouse function
 
                cvWaitKey(0);
                cvReleaseImage(&img);
		cvDestroyWindow("map");
	
}
 

void Copencv01Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}
void Copencv01Dlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting
 
		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
 
		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;
 
		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}
 
HCURSOR Copencv01Dlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}
 
void on_mouse( int evt, int x, int y, int flags, void* param )
{
	CString xaxis, yaxis;
 
		if (evt == CV_EVENT_LBUTTONDBLCLK)
	{
		
			xaxis.Format(_T("%d"), x);
			yaxis.Format(_T("%d"), y);
			SetDlgItemText(hwnd, IDC_Blue, xaxis);
			SetDlgItemText(hwnd, IDC_Green, yaxis);
	}
 
}

Jawad

Richard MacCutchan1-Jul-12 22:20

1-Jul-12 22:20

Use your debugger to check that your mouse event handler gets called when you double click it. Looking at this code it seems to be somewhat complicated by using opencv and MFC; I wonder why you do not just use MFC on its own?

Re: need help: image coordinates(x,y) in opencv with mfc Pin

jawadali4772-Jul-12 0:19

Re: need help: image coordinates(x,y) in opencv with mfc Pin

2-Jul-12 0:19

i have checked it with some other examples. works fine. but for this program it does not display the coordinates in static boxes. am i defining the handle HWND hwnd correctly??

Richard MacCutchan2-Jul-12 0:31

2-Jul-12 0:31

jawadali477 wrote:
am i defining the handle HWND hwnd correctly?

Yes, but you do not initialise it anywhere. In any case you do not need this variable as you already have the pre-defined CWnd::m_hWnd[^] variable which contains the handle to your object's window.

Re: need help: image coordinates(x,y) in opencv with mfc Pin

jawadali4772-Jul-12 1:38

Re: need help: image coordinates(x,y) in opencv with mfc Pin

2-Jul-12 1:38

can you please elaborate it because i didn't get your point i.e
"pre-defined CWnd::m_hWnd[^] variable which contains the handle to your object's window."
you see, i'm not good in programming with handles. Frown | :(

Richard MacCutchan2-Jul-12 6:40

2-Jul-12 6:40

The pre-defined variable m_hWnd already holds the handle to the window of the dialog, so that is the one to use in your calls to SetDlgItemText().

jawadali477 wrote:
i'm not good in programming with handles.

This is something you need to study as it is fairly key to the whole Windows framework.

Re: need help: image coordinates(x,y) in opencv with mfc Pin

jawadali4772-Jul-12 17:53

Re: need help: image coordinates(x,y) in opencv with mfc Pin

2-Jul-12 17:53

thank you Richard MacCutchan for your replies.
i did use m_hWnd in SetDlgItemText() in first place, but at that time it gave the error as m_hWnd :undeclared identifier. you see i'm using a thread to call mouse function. do i need to redefine m_hWnd?? if yes, where??

Richard MacCutchan2-Jul-12 21:17

2-Jul-12 21:17

If your mouse handler is not part of the dialog class then you need to store m_hWnd into a global variable in your OnInitDialog() method. I wonder, however, why you think it necessary to run this in a separate thread and why you are using opencv, when you could accomplish your goal with a much simpler MFC based application.

Re: need help: image coordinates(x,y) in opencv with mfc Pin

jawadali4775-Jul-12 0:49

Re: need help: image coordinates(x,y) in opencv with mfc Pin

5-Jul-12 0:49

thank you Richard MacCatchan for replies.

i have implemented MFC based application using picture control. i have included bitmap image in picture control and have defined subclass where i have used OnLButtonDblClk to get the co-ordinates of picture control (not image u know) in static box. and it works fine. but i have some questions and need help.

1. how to implement zoom in/out an the scroll option (for large image sizes)?
2. when applying zoom in/out, will the pixel co-ordinates change (i mean if a point is lying on say (x,y) in picture control before zoom in what will happen to its co-ordinates after zoom in)?

Regards
JAwad

Richard MacCutchan5-Jul-12 2:28

5-Jul-12 2:28

1. Google should be your first place to look for some suggestions[^].
2. As far as I know, the position will remain constant, it is just the scale that changes, but again you may wish to try some research to see if there are any suggestions around.