C / C++ / MFC

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

jawadali477

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 | :(

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

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

jawadali477

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??

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

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

jawadali477

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

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

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

1-Jul-12 15:06

In that case I cann't use AfxBeginthread to Create the derived CWinthread as the CwinThread constructer return by the Helper AfxBeginthread doesn't take any paramters

C++

// contructer for dervied CwinThread having a base of CAsynSocket
MyCWinThread :: MyCwinthread(int port) : Myasncsocket(port)

I would then also have to Call MyCwinthread::Createthread as I beleive the Framework Helper function does both correct

Ftp : how to know downloading data is completed?

Albert Holguin2-Jul-12 4:30

Albert Holguin

2-Jul-12 4:30

AfxBeginThread is just a helper, there's no need to use that if it doesn't fit your needs, but it seems like you got the gist of things.

includeh101-Jul-12 2:15

includeh10

1-Jul-12 2:15

here is data (in ASCII format) downloaded from server by command "LIST":

total 1100
-rw-------   1 root          38 Dec 16  2010 .bash_history
    (omitting several lines here)
drwx--x--x   6 other        512 Oct 13  2005 usr

My question is:
How do I know the downloading is completed?

I guess I need to send count of bytes downloaded to server, so server will tell if downloading is OK.

If so,
What instruction (command) should I send to server?
Which port (command port or data port) should I use for sending the instruction?

Thanks.

.

Re: Ftp : how to know downloading data is completed?

Richard MacCutchan1-Jul-12 6:13

1-Jul-12 6:13

Is this something to do with C++ or are you just trying to understand how to use FTP? If you are doing this programmatically then you just keep reading the socket until no more data is presented.

includeh10 wrote:
Which port (command port or data port) should I use

Not sure that I understand your question here; what do you mean by "command port or data port"?