C / C++ / MFC

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.

Re: Get Current View in SDI

Get Current View in SDI

D.Manivelan1-Jul-12 18:40

D.Manivelan

1-Jul-12 18:40

I am developing a application in MDI which contains few child windows.
And also i want few windows which is not attached to CMainframe.So i created new class derived from CFrameWnd.

C++

pTagSummaryTemplate = new CSingleDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CHarmonyDoc),
		RUNTIME_CLASS(CFrameWnd),       // main SDI frame window
		RUNTIME_CLASS(CTagSummary));
	AddDocTemplate(pTagSummaryTemplate);

And also each window has to updated frequently and im doing this by uisng below code for MDI childwindows from CMainframe

C++

CMDIChildWnd *fChWnd = GetActivePanelWnd();
if(fChWnd->GetSafeHwnd())
{
CView *curView = ((CView *)fChWnd->GetActiveView());
if(curView)
{
((COverView *)curView)->UpdatePanel();
}
}

But for SDI, i dont know how to get activeview(Current active view of SDI)So pls help me.

Richard MacCutchan1-Jul-12 22:14

1-Jul-12 22:14

Since SDI stands for Single Document Interface there is only one document and one view, so it is always the active one.

Re: Get Current View in SDI

krmed2-Jul-12 0:48

krmed

2-Jul-12 0:48

Actually, in an SDI, there is only one document, but there can be many views.

In any event (to the OP) the proper way to update views in SDI or MDI is to store and update your data in the document, then call the document's UpdateAllViews method, passing a hint if needed.

This automatically calls the OnUpdate method of every view without you having to call it manually. In that method, you can do whatever is necessary to update the view.

Hope this helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

Re: Get Current View in SDI

Richard MacCutchan2-Jul-12 0:53

2-Jul-12 0:53

Fine, but you should be replying to the OP's message, not to mine.

Calling a member class implicitly

ForNow1-Jul-12 3:36

1-Jul-12 3:36

Hi,

I have a CAsynSocket derived class as a member of my CWinThread derived the problem
is my CAsynSocket derived constructer takes a port #

How can I call/create my CAsyncSocket derived class implicitly passing the constructer a port no

for example my derived CWinthread class

Class MyCWinthread : public CWinThread
{
Myasnycsocket thissocket;

.
.
.
.
}
// myderived CAsynSocket Class
class Myasncsocket : public CAsyncSocket
{

private:

int port;

};

// constructer
Myasnycsocket::Myasynsocket(int myport)
{
port = myport;
};

thanks

Richard MacCutchan1-Jul-12 6:16

1-Jul-12 6:16

Just write a default constructor that calls the other constructor with a default port number. Something like:

C++

// constructor 
Myasnycsocket::Myasynsocket()
{
    Myasynsocket(33);
};

Note: please use proper <pre> tags around your code, and indentation within it, so it is more readable as in this case.

ForNow1-Jul-12 6:30

1-Jul-12 6:30

Hi,

I have used pre tags in the past they don't seem to take

I'll try again

What I would really wanted to do was to call Myascncsocket constroctor directly so I can initlize it withe port I want

E.g.

<pre lang='cpp'>

class MyCWinThread : public CWinThread
{

myasncsocket thisasyncsocket;

.
.
.
};

MyCWinthread::MyCwinthread(int myprort)
{
mayasyncsockt(port);
}

myasncsock::myasncsocket(int myprot)
{
port = myport;
}
</pre>

I am assuming this will initlize myasyncsocket with the port I want

Thanks

Richard MacCutchan1-Jul-12 6:43

1-Jul-12 6:43

As you can see (when you are editing and even after you have posted) your <pre> tags are not working, you may need to check your settings under the "Forums" tag.

As to your question, it's still not clear what you are trying to do. The above code does not really make sense.

ForNow1-Jul-12 9:46

1-Jul-12 9:46

I don't know where the settings tab is however I unchecked the box "treat my content as plain text not HTML" maybe that will do the trick

My question is the following

if I have a derived the CWinThread with a derived CAsynSocket class as a member of that CWinThread derived class

However my Derived CAsyncSocket Class contructer takes a int "port" number

is there anyway to call the derived CasynSocket constructer directly passing it a port number calling class member class members contructors directly I can control thier
creation

C++

class MyCwinThread : public CwinThread
{
 Myasycsocket thisasynsocket;
.
.
.
.
}
// myasyncoscket class

class Myasncsocket : public CAsyncSocket
{
private:
 int port
} 
// MyCwinThread contructor
MyCwinThread::MyCWinThread(int myport)
{
 thisasyncsocket(myport);
}

MyascncSocket::Myasncsocket(int myport)
{
 
  port = myport;
}

enhzflep1-Jul-12 8:08

enhzflep

1-Jul-12 8:08

I think you'd just declare another constructor for your myAsyncSocket class?
Since the class already has a Create[^] method, I guess you'd save the number for your own reference then create the socket using the specified port.

C++

class myAsynchSocket : public CAsyncSocket
{
    public:
        myAsynchSocket(int portNum);
    private:
        int myPort;
};

myAsynchSocket::myAsynchSocket(int portNum)
{
    myPort = portNum;
    Create(myPort);
}

Albert Holguin1-Jul-12 12:46

Albert Holguin

1-Jul-12 12:46

Well, simple way is to allocate it on the heap dynamically...

Class MyCWinthread : public CWinThread
{
 Myasnycsocket *thissocket;
 //...
}
BOOL MyCWinthread::InitInstance()
{
 CWinThread::InitInstance();

 thissocket = new Myasnycsocket( 33 ); //Specify port here...
}

Just don't forget to deallocate the dynamic memory afterward.

ForNow1-Jul-12 13:23

1-Jul-12 13:23

Yes I know

I was wonering what the syntax would be to allocate it on the stack

Thanks

Albert Holguin1-Jul-12 13:40

Albert Holguin

1-Jul-12 13:40

The default constructor is always going to be called in that case, as other have stated, you can give it a default value and that works as well. Alternatively, you can use multiple inheritance in this case, so that the CWinThread derived class is ALSO derived from the socket class and therefore requires the caller to pass the socket number.

ForNow1-Jul-12 15:06