Re: drawing a cercle by code - C / C++ / MFC Discussion Boards

Re: drawing a cercle by code

Mark Salsbery6-Apr-08 11:21

Mark Salsbery

6-Apr-08 11:21

CPallini wrote:
did ever heard about loops?

These?[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: drawing a cercle by code

CPallini6-Apr-08 21:23

CPallini

6-Apr-08 21:23

Exactly.
BTW turn off your CPMRU, it is not fair using such device for this kind of guess.
Roll eyes | :rolleyes:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 11:23

Schehaider_Aymen

6-Apr-08 11:23

lol, I know about loops but the prob that i dont know how many circles that the user wanna, let say 2O so how could i declare the 20 vars for those cercles
for (i=0 ; i< 20; i++)
{
Cercle[i].....??
}

Sigh | :sigh:

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Mark Salsbery6-Apr-08 11:27

Mark Salsbery

6-Apr-08 11:27

You could store the coordinates in an array.

An array container that grows automatically would be even better, like a vector or a CArray.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 11:29

Schehaider_Aymen

6-Apr-08 11:29

yup i'm using a vector Wink | ;)

but is the form "Formview" suitable for drawing or should i select another type?
i'm new on drawing :s

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 11:32

Schehaider_Aymen

6-Apr-08 11:32

Ok I'tested on a FormView and it works i had a white circle Wink | ;)

it was a stupid querstion

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Mark Salsbery6-Apr-08 11:43

Mark Salsbery

6-Apr-08 11:43

You can draw on any window.

A CFormView is useful when you have controls you need to layout on the window like a dialog window.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: drawing a cercle by code

Mark Salsbery6-Apr-08 11:20

Mark Salsbery

6-Apr-08 11:20

You don't necessarily have to write the code three times.
However you write the code, it must call Ellipse() three times.

These are two equivalent examples:

void CMyWnd::OnPaint() 
{
    CPaintDC dc(this); // device context for painting

    dc.Ellipse(10, 10, 50, 50);
    dc.Ellipse(30, 30, 70, 70);
    dc.Ellipse(50, 50, 90, 90);
}

void CMyWnd::OnPaint() 
{
    CPaintDC dc(this); // device context for painting

    CRect CircleRect(10, 10, 50, 50); //"CircleRect" - is that an oxymoron? :)

    for (int i = 0; i < 3; i++)
    {
        dc.Ellipse(&CircleRect);
        CircleRect.OffsetRect(20, 20);
    }
}

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 11:36

Schehaider_Aymen

6-Apr-08 11:36

when i click on the butoon nothing is drawin !!!
is it a prob of reference to the dc .?

<br />
void CSecondForm::OnButton1() <br />
{<br />
	// TODO: Add your control notification handler code here<br />
	<br />
	CPaintDC dc(this);<br />
	dc.Ellipse(20, 20, 100, 100);<br />
}<br />

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Mark Salsbery6-Apr-08 11:40

Mark Salsbery

6-Apr-08 11:40

You can only use a CPaintDC when responding to a WM_PAINT message (in OnPaint()).

Use a CClientDC in your button click handler instead...

void CSecondForm::OnButton1() <br />
{<br />
    // TODO: Add your control notification handler code here<br />
	<br />
    CClientDC dc(this);<br />
    dc.Ellipse(20, 20, 100, 100);<br />
}

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 11:43

Schehaider_Aymen

6-Apr-08 11:43

Thank you It works now. Roll eyes | :rolleyes:

but a last question ? how could i write a text into the cercle like "Cercle1" etc..
ANd thank you for your help.

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Mark Salsbery6-Apr-08 11:47

Mark Salsbery

6-Apr-08 11:47

You'll need to select a font into the DC (unless you want to use the default font), then you can use any of the
GDI text rendering functions (CDC::DrawText[Ex](), CDC::TextOut(), CDC::ExtTextOut(), etc.) to draw the text.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 11:53

Schehaider_Aymen

6-Apr-08 11:53

<br />
void CSecondForm::OnButton1() <br />
{<br />
	// TODO: Add your control notification handler code here<br />
	<br />
	CClientDC dc(this); <br />
	dc.Ellipse(10, 10, 70, 70);<br />
	dc.Ellipse(20, 20, 70, 70);<br />
	dc.Ellipse(30, 30, 70, 70);<br />
	dc.Ellipse(40, 40, 70, 70);<br />
	CString str;<br />
	str="Cercle";<br />
	CDC::TextOut(100,100,str);<br />
}<br />

CDC::TextOutA' : illegal call of non-static member function

i atried even with CDC::TextOut(100,100,"Cercle");

Same prob

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 11:57

Schehaider_Aymen

6-Apr-08 11:57

I found it, srry for the multipost. D'Oh! | :doh:

void CSecondForm::OnButton1()
{
// TODO: Add your control notification handler code here

CClientDC dc(this);
dc.Ellipse(10, 10, 70, 70);
dc.Ellipse(20, 20, 70, 70);
dc.Ellipse(30, 30, 70, 70);
dc.Ellipse(40, 40, 70, 70);
CString str;
str="Cercle";
dc.TextOut(100,100,str);
}

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Mark Salsbery6-Apr-08 12:00

Mark Salsbery

6-Apr-08 12:00

You got it Smile | :)

I notated it that way ("CDC::") to show what class the methods were in - the CDC class.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: drawing a cercle by code

Schehaider_Aymen6-Apr-08 12:01

Schehaider_Aymen

6-Apr-08 12:01

yup ou are all reason Wink | ;)

Thank you ppl.

"The Ultimate Limit Is Only Your Imagination."

Re: drawing a cercle by code

Hamid_RT8-Apr-08 7:08

Hamid_RT

8-Apr-08 7:08

See 3D Pie Chart[^].

Help with my c programming language

mvayder6-Apr-08 7:47

mvayder

6-Apr-08 7:47

Here is what I am supposed to do:

Write a program that inputs and holds up to 100 novels. Be sure that the program holds at least the title, author (last name first), category, whether its an enjoyable book (rate 1-10), and the number of pages. Experiment and find a way to sort the completed list by one of the following choices (at the users’ discretion): by title (be CAREFUL – think about library listings), by author, by category, or by number of pages. Have the program display the sorted list in a table. The user should be able to save their list to a file with their choice of name. The program should be able to read back from said file. Be sure the user can save the list after it has been sorted, and they can add books when the list has been read in from the file.

Here is my PROBLEM: http://mycodewarriorcode.weebly.com/[^]

Re: Help with my c programming language

bob169726-Apr-08 8:27

bob16972

6-Apr-08 8:27

So what part of your assignment do you need help with?
Which part don't you understand and maybe we can assist?

Re: Help with my c programming language

CPallini6-Apr-08 21:42

CPallini

6-Apr-08 21:42

The debugger is of big help in such circumstances.
Smile | :)

win32 dialogs...

Member 38254936-Apr-08 2:48

Member 3825493

6-Apr-08 2:48

I create Dialog Box with

case WM_CTLCOLORSTATIC:
{
HDC hdcStatic = (HDC)wParam;
SetTextColor(hdcStatic, RGB(255, 255, 255));
SetBkMode(hdcStatic, TRANSPARENT);
return (long)(g_hbrBackground);
}

but after chusing another program and return to dialog activation -
it don't show dialog box at all!!!

(when I do UpdateWindow in case ON_PAINT, it show dialog, but without color!!)

Re: win32 dialogs...

Mark Salsbery6-Apr-08 7:47

Mark Salsbery

6-Apr-08 7:47

The code you posted wouldn't have anything to do with that problem
(I'm assuming that code is in the dialog proc).

Using UpdateWindow in response to WM_PAINT is BAD. It's redundant, and also probably won't do anything.
UpdateWindow causes a WM_PAINT message to be sent by the system if any area of the window
being updated is marked invalid.

You're doing something wrong somewhere in your dialog proc if the window is not redrawing properly.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Any way to refresh a CHtmlView without it scrolling back to the top?

Taka Muraoka6-Apr-08 0:43

Taka Muraoka

6-Apr-08 0:43

The only thing that's changed is a few small icons scattered throughout the page so it's kinda annoying that calling Refresh() loses the current scroll position.

Tried saving and restoring the scroll position used the techniques described here[^] (and in the comments) but despite no failure codes returned, the page doesn't want to scroll Frown | :-(

I enjoy occasionally wandering around randomly, and often find that when I do so, I get to where I wanted to be [^].

Awasu 2.3.3 [^]: A free RSS/Atom feed reader with support for Code Project.

WSAENOBUFS error

itai shmida5-Apr-08 23:01

itai shmida

5-Apr-08 23:01

Hello.

I have an application that uses TCP Sockects to see if a port is alive
or dead.
For this I use a thread for every TCP-Ping that I do.
In each thread I open a socket and try to execute a blocking Connect
command.
I test this application on a list of 2000 IP:Port devices
The application tries this TCP-Ping for all these devices in every 10
minutes.
After about 6 hours, on every Connect attempt I get the WSAENOBUFS
error.
Also my computer seems to stuck.
Only if I kill the aplications process - the computer recovers and I
can run this aplication again for another 6 hours.

I tried almost everything to change the TCP parameters through the
registry, and also to kill and free the socket.
Here is the sample code of the thread:

WSAStartup( MAKEWORD(2,2), &wsaData );
m_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if ( m_socket == INVALID_SOCKET )
{
       LogMsg.Format("ERROR socket INVALID_SOCKET: %d", WSAGetLastError());
       WSACleanup();
       hr = E_FAIL;
       return hr;
}
clientService.sin_family        = AF_INET;
clientService.sin_addr.s_addr   = inet_addr(IpAddress);
clientService.sin_port          = htons(Port);

// connect the socket to the IP:Port - a blocking connect
rc = connect(m_socket, (SOCKADDR*) &clientService, sizeof(SOCKADDR));
if (rc == SOCKET_ERROR)
{
       LogMsg.Format("ERROR connect SOCKET_ERROR: %d", WSAGetLastError());
       LOG_OUTPUT(LogMsg.GetBuffer());
       hr = E_FAIL;
}
else
{
       hr = S_OK;
       shutdown(m_socket, SD_BOTH);
}
CancelIo((HANDLE)m_socket);
closesocket(m_socket);
WSACleanup();
return hr;

I don't understand why I have this error - it seems like after a
period of time the TCP buffer is filled although I don't use any TCP
command that takes TCP buffer (only createSocket and Connect), does
these commands take TCP buffer? how do I free the buffer?
After finishing this code, the thread exits.
I also tried to use the Select, WSAEventSelect, CreateIoCompletionPort
commands with a non-blocking socket and had the same results.

Can anyone help me?

Re: WSAENOBUFS error [modified]

Eytukan6-Apr-08 0:50

Eytukan

6-Apr-08 0:50

itai shmida wrote:
For this I use a thread for every TCP-Ping that I do.

In the task manager, Can you check how many threads your application has at
that specific instance?and see if that's the expected count . Also are you sure you are cleaning up all the stuff neatly?

The port no is > 5000 and you are getting this error?
http://support.microsoft.com/kb/196271[^]

OK,. what country just started work for the day ? The ASP.NET forum is flooded with retarded questions. -Christian Graus

Best wishes to Rexx[^]

modified on Sunday, April 6, 2008 6:56 AM

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