C / C++ / MFC

Re: Resolving Hostname :: MFC

7-Apr-02 9:11

Hi.

I am working on a simple program that resolves hostname. Here is the concept:

Enter hostname: www.google.com
Resolve IP: 216.239.33.101

The program has a dialog box for the user to enter the hostname such as (www.google.com or www.yahoo.com).
Here is the function that does it:

-----
void CDomainDNS::resolveHost(const CString &rHName)
{
WSAData wData;

if (WSAStartup(MAKEWORD(2,2), &wData) == SOCKET_ERROR)
{
CString error;
error.Format("Error initialization Winsock");
AfxMessageBox(error);

return;
}

hostent *host = 0;

host = gethostbyname(rHName);

if (host == 0)
mVeri = false;

else
{
mIP = inet_ntoa(*(reinterpret_cast(host->h_addr)));

mVeri = true;
}
}
-----

The code above works perfect under Win32 *console*. However, it only outputs my *internal* ip in MFC application mode.

For example:

Enter hostname: www.google.com
Resolve IP: 192.168.0.1

Is there something I need to change or add when dealing with the code above in Win32 MFC environment? Maybe there is a better tool for resolve hostname via MFC?

Thanks,
Kuphryn

Phil Speller7-Apr-02 22:48

Phil Speller

7-Apr-02 22:48

I'm afraid that this isn't really an answer, but I use a very similar method to resolve a host name in an MFC app and it works just as expected. However, I do have 2 comments to make:

1. I guess it's just a typo, but your assignment of mIP should read:
mIP = inet_ntoa( *(reinterpret_cast<struct in_addr="" *="">( host->h_addr )) );

2. I use AfxSocketInit(), called from the apps InitInstance fn, rather than WSAStartup. I'm pretty
sure that AfxSocketInit is required for MFC apps (which will eventually call WSAStartup anyway).

I'm currently using Win98 SE, but a quick search through the MSDN library that came with my VC6 brought up a few issues of gethostbyname() returning a list of all local IP addresses under certain conditions if using WinNT - might be worth checking these out?

Hope this helps,

Free

Re: Resolving Hostname :: MFC

valikac8-Apr-02 4:36

Where to start (new question)

8-Apr-02 4:36

Okay.

The problem was that I did not call UpdateData(TRUE) before passing the hostname to function resolveHost(...).

Kuphryn

SilverShalkin7-Apr-02 7:40

7-Apr-02 7:40

I went down to www.gamedev.net as i was told to do "if i was interested in making games" and i found an article that can be found here if you would like to read it:

http://www.lupinegames.com/articles/path_to_dev.html

This article basically stated the best way to start learning how to program games "It did not say how, or how to start Frown | :(

The Article gave you a list of projects and why they would help you learn how to program. "After i read this article i thought to my self 'What the heck' And now i am on the first project... which is a tetris like game."

The tetris example was in windows and ill asume it was done with DirectX. Ive downloaded all the DirectX 8.1 SDK files... and now just wondering: Where can i find a good real beginner tutorial on beginning DirectX 8.1?

Also, just for fun kind of question: How do you bring an image to the screen?

Thanks all!

~SilverShalkin

ps... If your interested in game development: www.flipcode.com and www.gamedev.net are great places to get started Smile | :)

Paul M Watt7-Apr-02 8:29

Paul M Watt

7-Apr-02 8:29

Have you looked a the sample programs with the DirectX SDK. There is a game called donuts, and there are a few other examples that describe how to setup display surfaces and paint bitmaps.

Checkout my Guide to Win32 Paint for Intermediates

SilverShalkin7-Apr-02 8:26

7-Apr-02 8:26

I've played the game donuts, but when ever i click on the tutorial, it comes up and says that it cannot find the tutorial of hh.exe. How do ill look at the source of the donuts game?

Thanks

~SilverShalkin

Rose | [Rose]

Paul M Watt7-Apr-02 8:59

Paul M Watt

7-Apr-02 8:59

Did you choose to install the source files along with all of the sample applications?

If so, then you simply need to navigate to the directories where the samples are, and open them up in Dev Studio.

Checkout my Guide to Win32 Paint for Intermediates

Christian Graus7-Apr-02 10:09

Christian Graus

7-Apr-02 10:09

Have you tried msdn.microsoft.com ? It's got heaps of stuff on DirectX. I believe www.codeguru.com has a column on it as well, or on game programming at least.

You shouldn't need DirectX for a Tetris game though - I believe there's a couple here on CP if you want to see how other people have done it. It's probably worth it to do it with and without DX IMO.

SilverShalkin wrote:
Also, just for fun kind of question: How do you bring an image to the screen?

Do you mean with or without DX ?

I have an Asteroids game, which uses DX 6, that I'm going to write an article for and post tonight. It was my 'write a simple game to learn game programming' project, so it's probably a little rough, but it's just sitting there, so I thought someone might find it useful. Smile | :)

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

SilverShalkin7-Apr-02 15:25

7-Apr-02 15:25

That would be cool :

Christian Graus wrote:
I have an Asteroids game, which uses DX 6, that I'm going to write an article for and post tonight. It was my 'write a simple game to learn game programming' project, so it's probably a little rough, but it's just sitting there, so I thought someone might find it useful.

Im getting a book that teaches DirectX... I'll learn from that and any other question... i got four forums to ask it Smile | :)

Thanks for your help

~SilverShalkin

Rose | [Rose]

Christian Graus7-Apr-02 15:26

Christian Graus

7-Apr-02 15:26

The big problem ( and it will be a problem with my code as well ) is that DX changes so often, to write in DX 8, you need a book on DX 8. The book you buy will come with the SDK for the version it teaches, and for 2D stuff it probably won't matter so much, but still, be aware that the code changes between versions, therefore when you find code online you need to know what version it is for.

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

SilverShalkin7-Apr-02 15:49

Grrrrr (quick newbie query)

7-Apr-02 15:49

Thats got to be anoying Frown | :(

at times like this i usually think- "why learn it, you'll have to learn it again..." but if you learn it once, the next time you'll have to learn it, you'll only have to change a little here and learn a little more there. Smile | :)

~SilverShalkin

Rose | [Rose]

nice book for C++

7-Apr-02 7:38

hi friends
nice to introduce ..
i am suju,new to codeproject and c++
any one have an idea nice book for c++

my defination to nice book:

eg:
class A
{
virtual void function1()=0;
};

that explain to me what complier can do,linker can do and process can do for above class declaration.
that book teach me more about memory and os .

r u people think bore please execuse.
ok friends we will meet again with good discussion.

Rose | [Rose]

Re: nice book for C++

alex.barylski7-Apr-02 18:08

alex.barylski

7-Apr-02 18:08

"Thinking in C++" - Bruce Eckel

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

7-Apr-02 7:35

What on earth is causing this to copy nothing to the CPaintDC??
-----------

void CCustomStaticControl::OnPaint()
{
  // Do we have an update rect?
  if (this->GetUpdateRect(NULL))
  {
    CPaintDC dcPaint(this);
    CDC dcMem;
    CRect rcRect;

    this->GetClientRect(rcRect);
    dcMem.CreateCompatibleDC(&dcPaint);

    CBrush brushBack(this->m_rgbBack);
    dcMem.FillRect(rcRect, &brushBack);

    // Blit to the painting device context.
    dcPaint.BitBlt(rcRect.left, rcRect.top, rcRect.Width(), rcRect.Height(), &dcMem, rcRect.left, rcRect.top, SRCCOPY);
  }
}

It just refuses to draw anything. Works fine if I do it straight to the CPaintDC directly tho.

Re: Grrrrr (quick newbie query)

PJ Arends7-Apr-02 8:05

PJ Arends

7-Apr-02 8:05

You have to have a bitmap selected into your memory DC.
have a look in MSDN for the CreateCompatibleBitmap() function.

void CCustomStaticControl::OnPaint() 
{
  // Do we have an update rect? 
  if (this->GetUpdateRect(NULL))
  {
    CPaintDC dcPaint(this);
    CDC dcMem;
    CRect rcRect;
    CBitmap bmp;

    this->GetClientRect(rcRect);
    dcMem.CreateCompatibleDC(&dcPaint);

    bmp.CreateCompatibleBitmap(&dcPaint, rcRect.Width(), rcRect.Height());
    CBitmap *oldbmp = (CBitmap *)dcMem.SelectObject(&bmp);

    CBrush brushBack(this->m_rgbBack);
    dcMem.FillRect(rcRect, &brushBack);

    // Blit to the painting device context.
    dcPaint.BitBlt(rcRect.left, rcRect.top, rcRect.Width(), rcRect.Height(), &dcMem, rcRect.left, rcRect.top, SRCCOPY);

    dcMem.SelectObject(oldbmp);
  }
}

---
CPUA 0x5041

Sonork 100.11743 Chicken Little

It may be that your sole purpose in life is simply to serve as a warning to others.

Disable Resize Window :: MFC

valikac7-Apr-02 7:01

Re: Disable Resize Window :: MFC

7-Apr-02 7:01

Hi.

I have been wondering about the possibility of *disabling* resize feature in a window. For example, when a window is in restore setting, the user can change the size of the window via dragging one of its four size or four corners. I there a way to disable that feature completely? I am basically describing a dialog window without having to derive the class from CDialog.

In the program I am working on, I have disabled the maximize feature. The window stays restored throughout. However, the user can resize it. I would like to disable that feature too. The bottom line is the window looks better if it remains in its original settings (size).

Thanks,
Kuphryn

Paul M Watt7-Apr-02 7:05

Paul M Watt

7-Apr-02 7:05

The simplest way to completely disable sizing is to remove the WS_THICKFRAME style, and
replace it with the WS_BORDER style.

Checkout my Guide to Win32 Paint for Intermediates

Re: Disable Resize Window :: MFC

valikac7-Apr-02 7:10