C / C++ / MFC

MrMcIntyre4-Oct-09 7:19

Re: C++ Helper Wanted [modified]

4-Oct-09 7:19

When I wrote the code I had 1 failed error. Here the code for the Client, and if someone could tell me what I have done wrong.

#include <windows.h><br />
<br />
const char g_szClassName[] = "MyProject";<br />
<br />
//Step 4: The Window Procedure<br />
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)<br />
{<br />
	switch(msg)<br />
	{<br />
	case WM_CLOSE:<br />
		DestroyWindow(hwnd);<br />
		break;<br />
	case WM_DESTROY:<br />
		PostQuitMessage(0);<br />
		default;<br />
			return DefWindowProc(hwnd, msg, wParam, lParam);<br />
	}<br />
	return 0;<br />
}<br />
<br />
	int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,<br />
		LPSTR lpCmdLine, int nCmdShow)<br />
	{<br />
		WNDCLASSEX wc;<br />
		HWND hwnd;<br />
		MSG Msg;<br />
<br />
		//Step 1: Registering the Window Class<br />
		wc.cbSize			= sizeof (WNDCLASSEX);<br />
		wb.style			= 0;<br />
		wc.lpfnWndProc		= WndProc;<br />
		wc.cbClsExtra		= 0;<br />
		wc.cbWndExtra		= 0;<br />
		wc.hInstance		= hInstance;<br />
		wc.hIcon			= LoadIcon(NULL, IDI_APPLICATION);<br />
		wc.hCursor			= LoadCursor(NULL, IDC_ARROW);<br />
		wc.hbrBackground	= (HBRUSH) (COLOR_WINDOW+1);<br />
		wc.lpszMenuName		= NULL;<br />
		wc.lpszClassName	= g_szClassName;<br />
		wc.hIconSm			= LoadIcon(NULL, IDI_APPLICATION);<br />
<br />
		if(!RegisterClassEx(&wc))<br />
		{<br />
			MessageBox(NULL, "Window Registration Failed!", "Error",<br />
				MB_ICONEXCLAMATION | MB_OK);<br />
			return 0;<br />
		}<br />
<br />
		//Step 2: Creating the Window<br />
		hwnd = CreateWindowEx(<br />
			WS_EX_CLIENTEDGE,<br />
			g_szClassName,<br />
			"The title of my window",<br />
			WS_OVERLAPPEDWINDOW,<br />
			CW_USERDEFAULT, CS_USERDEFAULT, 903, 729,<br />
			NULL, NULL, hInstance, NULL);<br />
<br />
		if(hwnd == NULL)<br />
		{<br />
			MessageBox(NULL, "Window Creation Failed", "Error!",<br />
				MB_ICONEXCLAMAION | MB_OK);<br />
			return 0;<br />
		}<br />
<br />
		ShowWindow(hwnd, nCmdShow);<br />
		UpdateWindow(hwnd);<br />
<br />
		//Step 3: The Messag Loop<br />
		while(GetMessage(&Msg, NULL, 0,0) > 0)<br />
		{<br />
			TranslateMessage(&Msg);<br />
			DispatchMessage(&Msg);<br />
		}<br />
		return Msg.wParam;<br />
	}<br />

Thanks.

Andrew McIntyre

Michael Schubert4-Oct-09 11:33

Michael Schubert

4-Oct-09 11:33

MrMcIntyre wrote:
When I wrote the code I had 1 failed error

I get 5 or 6 when I try to compile this (VC6, 2003 Platform SDK). The switch statement is screwed up, you're using non-existing window styles, typos, etc.

All I see is a pretty standard Win32 application skeleton that just creates a window and a message loop. Well, it would if you fixed all the obvious errors.

Don't get me wrong - I don't want to discourage you from writing this program but you're getting way ahead of yourself. Once you really understand what the above code does (and know how to fix the errors) you can start putting in your own code.

modified on Sunday, October 4, 2009 5:42 PM

MrMcIntyre4-Oct-09 11:51

4-Oct-09 11:51

It's alright. I got the application to work perfectly now.

Andrew McIntyre

MrMcIntyre5-Oct-09 9:57

5-Oct-09 9:57

Does anyone know a code to centre the Win32 client to the screen. Just brushing up on a few minor things. Please forgive if I ask too many questions.

Thanks

Andrew McIntyre

David Crow5-Oct-09 10:09

5-Oct-09 10:09

MrMcIntyre wrote:
Does anyone know a code to centre the Win32 client to the screen.

If you are using MFC, CenterWindow(). If not, you can still consult its source code to see how it is handled.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

MrMcIntyre5-Oct-09 10:16

5-Oct-09 10:16

Is that the full line of code? If so, where would I place it in the source code.

Andrew McIntyre

David Crow5-Oct-09 10:19

5-Oct-09 10:19

MrMcIntyre wrote:
Is that the full line of code?

Did you consult the documentation (or the source code)?

MrMcIntyre wrote:
If so, where would I place it in the source code.

At the point you want the window centered. After the window has been created but before it is rendered would be a good place to start (hint: WM_CREATE).

MrMcIntyre5-Oct-09 10:21

5-Oct-09 10:21

What documentation, I haven't read any documents

Andrew McIntyre

Richard MacCutchan5-Oct-09 10:44

5-Oct-09 10:44

MrMcIntyre wrote:
What documentation, I haven't read any documents

And how many times must I suggest that you do, before the message sinks in?

MrMcIntyre5-Oct-09 10:52

5-Oct-09 10:52

But I haven't saw any documentation what ones, it could be any on this website or others.

If there is documentation send me a link.

Andrew McIntyre

Richard MacCutchan5-Oct-09 11:32

5-Oct-09 11:32

MrMcIntyre wrote:
If there is documentation send me a link.

I suggest you start with MSDN[^], which has information on just about everything you need to write Windows applications. Read articles here on Code Project, as I said before there are some excellent beginner's guides. Use Google to search for specifics on the subjects you are interested in.

Above all understand that no project can be produced without a lot of hard work.

David Crow5-Oct-09 10:31

5-Oct-09 10:31

In response to the WM_CREATE message, consider calling MoveWindow() or SetWindowPos().

MrMcIntyre5-Oct-09 10:37

5-Oct-09 10:37

I really don't understand what you are saying. I could not find WM_CREATE message in my code anywhere.

Could you write the line of code just quickly so I see how it works and I will figure out where to put it.

Thanks

Andrew McIntyre

David Crow6-Oct-09 2:19

6-Oct-09 2:19

MrMcIntyre wrote:
I really don't understand what you are saying. I could not find WM_CREATE message in my code anywhere.

Could you write the line of code just quickly...

Does Google not work in your area? See here.

Richard MacCutchan6-Oct-09 3:08

6-Oct-09 3:08

MrMcIntyre wrote:
I really don't understand what you are saying. I could not find WM_CREATE message in my code anywhere.

Could you write the line of code just quickly so I see how it works and I will figure out where to put it.

Andrew, from the structure of your sentences I suspect that English is your first language. However from the content, including the second line above, I would suspect that you are very much a beginner to Windows programming, possibly C++, and possibly even programming itself. You seem to be approaching this problem in totally the wrong way, as you seem to believe that you are going to create this project by asking questions on this forum and building the program one line at a time, without really understanding the code you are putting together. I have recommended you a number of times to buy some books, use the tutorials on this site (and MSDN and Google) to learn the basics and write some simple programs so that you can at least understand the concepts of windows, dialogs, message passing, menus, controls etc.

You may be under the misapprehension that people here are being delibarately obstructive in their answers; nothing could be further from the truth. Everyone here wants to help each other, but they can only help you fix things after you have created your program(s). Nobody here has the time to write your code, or teach you how to do it.

MrMcIntyre6-Oct-09 5:25

6-Oct-09 5:25

Richard, leave me alone and stop writing a lot of garbage.

I don't want to buy books, I already have a assistant programmer so no need for that you are beginning to annoy me.

Andrew McIntyre

Richard MacCutchan6-Oct-09 5:49

6-Oct-09 5:49

MrMcIntyre wrote:
Richard, leave me alone and stop writing a lot of garbage.

I am not writing a lot of garbage. I am trying, without much success, to get you to stop asking extremely basic questions and learn something about programming.

MrMcIntyre wrote:
I already have a assistant programmer so no need for that you are beginning to annoy me.

Ignoring the fact that this comment is quite rude, if you have a programmer working for you then you don't need to keep asking these questions, you can just get him/her to do the work for you.

Big Daddy Farang6-Oct-09 8:22

Big Daddy Farang

6-Oct-09 8:22

Hi Richard,

Thanks for trying. This thread was amusing and educational. Smile | :)

BDF

People don't mind being mean; but they never want to be ridiculous.
-- Moliere

Richard MacCutchan6-Oct-09 10:25

Active scan on a WiFi NIC, including flush of old scan results - how ? Pin

6-Oct-09 10:25

Big Daddy Farang wrote:
Thanks for trying. This thread was amusing and educational.

A pity it did not succeed! But thanks for the comment; always appreciated, even on those many occasions when I get it all wrong.

amitalonm4-Oct-09 3:09

amitalonm

4-Oct-09 3:09

Hi,

I wrote a program using VC++ that should scan for available wireless networks in the area.

In my SW I use the commands OID_802_11_BSSID_LIST_SCAN and OID_802_11_BSSID_LIST.

My questions are:
1. How can I Force the Wireless NIC to do ACTIVE SCAN (as contrary to PASSIVE scan) ?

2. According to tests that I did, the card does not flush the list between scans, i.e. I get for several scan a result of an AP that was on air during an old scan, but is no longer there, and new scans return's it's data as if it is still there.

A code part that I used is attached - in order to illustrate which functions I am using.

NDIS_802_11_BSSID_LIST* m_pBSSIDList;
m_pBSSIDList = (NDIS_802_11_BSSID_LIST *) VirtualAlloc (NULL,
                                                        sizeof (NDIS_802_11_BSSID_LIST) * NUMBEROF_BSSIDS,
                                                        MEM_RESERVE | MEM_COMMIT,
                                                        PAGE_READWRITE) ;


memset (m_pBSSIDList, 0, sizeof (NDIS_802_11_BSSID_LIST) * NUMBEROF_BSSIDS);

// Do Scan
oidcode = OID_802_11_BSSID_LIST_SCAN;
DeviceIoControl (m_handle,
		IOCTL_NDIS_QUERY_GLOBAL_STATS,
		&oidcode,
		sizeof(oidcode),
		(ULONG *) NULL,
		0,
		&bytesreturned,
		NULL);

Sleep (6100); // According to the documentation the result of the scan should be valid after 6 seconds.
// The original line was delay of 2000 mSec. find out why...
//Sleep (2000);

// Read scan results
oidcode = OID_802_11_BSSID_LIST;
if (DeviceIoControl(    m_handle,
			IOCTL_NDIS_QUERY_GLOBAL_STATS,
			&oidcode,
			sizeof(oidcode),
			(ULONG *) m_pBSSIDList,
			sizeof(NDIS_802_11_BSSID_LIST) * NUMBEROF_BSSIDS,
			&bytesreturned,
			NULL) == 0)
{
	// List failed
	return NULL;
}
else
{
	return m_pBSSIDList;
}

If you have any idea of how can I solve my problems, or if you see that I forgot any important line- please let me know.
I am open to hear about completely new ways to do this. only requirement is that I will use VC++.

Thanks a lot,
--Amit.

Re: Active scan on a WiFi NIC, including flush of old scan results - how ? Pin

David Crow5-Oct-09 5:08

Re: Active scan on a WiFi NIC, including flush of old scan results - how ? Pin

5-Oct-09 5:08

See responses here.

amitalonm5-Oct-09 10:06

amitalonm

5-Oct-09 10:06

Hi David,

Thanks for your answer.

it answered my first question, but the second question, that bothers me much more is still left unanswered.
My problem is that the Wireless Card returns old scanned data, that is no longer relevant, of APs that are no longer on air.

According to the text in here:
http://msdn.microsoft.com/en-us/library/ms799400.aspx[^]

it says that

"...The miniport driver must manage its cached BSSID scan list in the following ways:<br />
<br />
    * The driver must clear its BSSID scan list when set by OID_802_11_BSSID_LIST_SCAN before it starts the explicit network scan.<br />
...<br />

"

I tried my code, which uses the OID_802_11_BSSID_LIST_SCAN command, on 2 different Wireless NICs (DELL, and Intel) and both Wireless NICs did not clear the history and kept returning the result of old scanned APs that are no longer on air.

Can you maybe help me here as well ?

Thanks,
-- Amit.

Re: Active scan on a WiFi NIC, including flush of old scan results - how ? Pin

David Crow5-Oct-09 10:14