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Re: Winsock problem

masnu7-Jul-10 4:56

masnu

7-Jul-10 4:56

Sorry Moak, I was cutting and pasting and forgot the most important part. Here's the actual code to open and connect:

int CHPCtrl::Connect()
{


	struct sockaddr_in	rmtAddr;
	
//	Create data socket
	m_Socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	if ( m_Socket == INVALID_SOCKET )
		return 1;

//	Set client properties
	rmtAddr.sin_family	= AF_INET;
	rmtAddr.sin_addr.s_addr = inet_addr( remoteIP );
	rmtAddr.sin_port	= htons( m_nDevicePort );

//	Connect to remote
	if ( connect( m_Socket, (struct sockaddr *)&rmtAddr, sizeof(rmtAddr) ) == SOCKET_ERROR )
		return 1;


//	Open rx monitor thread
	m_hRxMonitor = (HANDLE)_beginthreadex( 0, 0, RxMonitor, this, CREATE_SUSPENDED, 0 );

	if ( m_hRxMonitor )
	{
		
		m_bConnected = true;
		ResumeThread( m_hRxMonitor );

	} //__if ( m_pReadThread )__

	return 0;

}

And in a separate thread I wait for incoming data:

UINT CHPCtrl::RxMonitor(void *pThis)
{


	CHPCtrl		*pCtrl = (CHPCtrl*)pThis;
	int		bytes_recevied = 0;
	
	fd_set		sckt;
	timeval		timeout;

//	Set two second timeout
	timeout.tv_sec	= 2;
	timeout.tv_usec = 0;

//	Monitor all rx traffic
	while ( pCtrl->m_bConnected )
	{

		FD_ZERO( &sckt );
		FD_SET( pCtrl->m_Socket, &sckt );

		int ret = select( 0, &sckt, 0, 0, &timeout );

		switch ( ret )
		{

			case  SOCKET_ERROR:
				//Handle error 
				break;

			case 0:	//Timeout
				//Handle time out
				break;

			default:
				pCtrl->ReadFromSocket( pCtrl->m_Socket );

		} //__switch ( ret )__

	} //__while ( m_bRunRx )__

//	Shutdown rx comm
	shutdown( pCtrl->m_Socket, SD_RECEIVE );

	return 0;

}

m_Socket is a class variable. I did this so I can send and receive on the same socket without blocking. Please let me know if you see anything wrong with this.

Re: Winsock problem

Moak7-Jul-10 5:05

Moak

7-Jul-10 5:05

Looks good, but I have never used select() on Windows.
Perhaps have a look at the questions I had, they might give you some ideas.

Smile | :)

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Re: Winsock problem

Parthiban6-Jul-10 18:16

Parthiban

6-Jul-10 18:16

In ARM processor, which BSP r u using? how r u receiving Data? U TCP stack implemented? If u have stack implementation, there should not be problem in sending. If u dont have stack implementation, u have to assemble the packet in the TCP/IP struct and have to send it.

Re: Winsock problem

masnu7-Jul-10 3:30

masnu

7-Jul-10 3:30

I'm not using any BSP and I implemented the TCP stack myself. I am able to establish communication via the 3-way handshaking process and then I assemble the package and send it. I used Wireshark to trap the packets between the PC and the micro and it recognizes it as a valid TCP/IP packet so I'm assuming it's formated properly.

Re: Winsock problem

Emilio Garavaglia7-Jul-10 4:10

Emilio Garavaglia

7-Jul-10 4:10

Please, write international English, not stenography.
We are not chatting with a phone.

2 bugs found.
> recompile ...
65534 bugs found.
D'Oh! | :doh:

Re: Winsock problem

masnu7-Jul-10 4:24

masnu

7-Jul-10 4:24

Please elaborate as to which part of the post wasn't in "international" English and I will be happy to clarify.

Re: Winsock problem

Iain Clarke, Warrior Programmer7-Jul-10 5:33

Iain Clarke, Warrior Programmer

7-Jul-10 5:33

masnu wrote:
Please elaborate as to which part of the post wasn't in "international" English and I will be happy to clarify.

"r"
"u"

Mind you, once translated from text messaging, it was a helpful question / answer.

Iain,

I am one of "those foreigners coming over here and stealing our jobs". Yay me!

Re: Winsock problem solved

masnu7-Jul-10 8:20

masnu

7-Jul-10 8:20

For those of you who are interested I finally figured out what the problem was. When I implemented the TCP/IP stack on the micro I made a mistake in the routine that calculates the IP header checksum. With an invalid checksum Winsock just disregarded the message. Once the correct checksum was sent everything worked fine.

Thanks to all of you for your help. I appreciate it.

Paul

Re: Winsock problem solved

Moak7-Jul-10 8:22

Moak

7-Jul-10 8:22

So it was not a Winsock problem at all. Wink | ;)

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Re: Winsock problem solved

masnu7-Jul-10 8:25

masnu

7-Jul-10 8:25

Nope! It was a me problem!! Smile | :)

Thanks Moak!

Re: Winsock problem solved

jeron17-Jul-10 10:18

jeron1

7-Jul-10 10:18

If you don't mind me asking, which network analyser did you use that didn't display an incorrect checksum?

Re: Winsock problem solved

masnu7-Jul-10 10:22

masnu

7-Jul-10 10:22

I was using Wireshark, but it DID display an incorrect checksum. I just got busy doing other things and completely overlooked it. It wasn't until I focused on the problem that I paid attention to what the analyzer was telling me.

Re: Winsock problem solved

jeron17-Jul-10 10:41

jeron1

7-Jul-10 10:41

Cool, the reason I asked is we have a similar project coming up, and a long time ago I ran into a goofy problem with a fairly early version of Ethereal where it didn't flag some field as having an invalid value, I lost a lot of hair over that one! Smile | :)

Re: Winsock problem solved

masnu7-Jul-10 10:46

masnu

7-Jul-10 10:46

I can see how that would happen. Thankfully this one didn't take me that much time. Try WireShark http://www.wireshark.org/[^] it's a useful tool.

Re: Winsock problem solved

Moak7-Jul-10 11:15

Moak

7-Jul-10 11:15

What wonders me now... that you actually have seen the corrupt IP packages in Wireshark. I was assuming you ran Wireshark on Windows PC and your hosts are connected via a switch, shouldn't the switch throw away the IP packages from the embedded board with wrong header checksum instead of forwarding them?

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Re: Winsock problem solved

Moak7-Jul-10 11:56

Moak

7-Jul-10 11:56

Oops I was thinking wrong. IP packages are OSI Layer 3 and network switches operate on Layer 2... so they couldn't care less about IP header checksums. Sorry for the confusion.

Happy coding! Smile | :)

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Re: Winsock problem solved

masnu8-Jul-10 2:59

masnu

8-Jul-10 2:59

No.. I had my embedded board connected to the PC with a cross-over cable.. no switch.

Detect Windows Search feature

Ivo Beltchev6-Jul-10 6:44

Ivo Beltchev

6-Jul-10 6:44

Hi
In my application I run Windows Search (Find files and fodlers) using IShellDispatch::FindFiles. However when the Search feature is disabled I get a message "There is no program associated to perform the requested action...". This is not nice.

I'd like to disable my search functionality when Windows Search is uninstalled. Does anybody know how to detect if Windows Search is available?

Thanks
Ivo

Re: Detect Windows Search feature

«_Superman_»6-Jul-10 19:56

«_Superman_»

6-Jul-10 19:56

Try IShellDispatch2::IsServiceRunning with service name as WSearch.

«_Superman_»

I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Detect Windows Search feature

Ivo Beltchev6-Jul-10 20:19

Ivo Beltchev

6-Jul-10 20:19

Thanks, that did the trick.

CListBox

AbhiHcl6-Jul-10 3:04

AbhiHcl

6-Jul-10 3:04

Hi I have created a list box using CListBox class. I want to give the hover effect on the list box item. like combo box.

Please anyone can help me how to do that.

Thanks

Re: CListBox

Niklas L6-Jul-10 3:21

Niklas L

6-Jul-10 3:21

You will need to handle the WM_MOUSEMOVE message and do the handling yourself.

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Re: CListBox

AbhiHcl6-Jul-10 19:50

AbhiHcl

6-Jul-10 19:50

Can u post some sample code please ???

Re: CListBox

Niklas L6-Jul-10 21:52

Niklas L

6-Jul-10 21:52

No, but here is the rough idea.

1. Create a new class derived from CListBox -> CHoverListBox.
2. Make it owner drawn (a window style).
3. Override DrawItem() and possibly OnMeasureItem(). You will need DrawItem since you will be changing the visual appearance of the control while hovering.
4. Add a message handler for WM_MOUSEMOVE, and in this handler figure out which item the cursor is over. Cooridnates of the mouse is supplied in screen coords, so you should convert them to client coords using CListBox::ScreenToClient(). Then use CListBox::GetItemRect() to find the hovered item. Set a flag for this item, and then call Invalidate(FALSE) to force a repaint.
5. Implement DrawItem() to look at the flag set, and paint the items accordingly.
6. Now you have a reusable class.
7. Write an article about what you did and post it on this site.

Tip: Do not use CListBox::SetItemData() to set the flag, because the space is likely to be needed by the users of your control. Use a separate integer in your class instead.

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Passing a String as function Argument

T.RATHA KRISHNAN6-Jul-10 3:03

T.RATHA KRISHNAN

6-Jul-10 3:03

Hi!
I'm passing a string variable to a function. Only the first letter of the string value is assigned to the formal parameter. Here is my function:

void setTextToButtons(stringw country, int tabSelected); //proto type declaratio


irr::core::stringw country = irr::core::stringw(list->getItem(countryCode));
setTextToButtons(country, tabSelected);                        //calling the function



void CGameMenuPlayerProfileState::setTextToButtons(stringw country, int tabSelected)  //function definition
{
	stringw query;
	query = L"Select Name from ";
	if(tabSelected = 17) {query += L"Test";}
	else if(tabSelected == 18){query += L"ODI";}
	else if(tabSelected == 19){query += L"T20I";}
	else {query += L"Test";}
	query += L" WHERE Team = '";
	query += country;
	query += "' ORDER BY RANDOM() LIMIT 11";
	printf("%s\n",query.c_str());
		//"Select Name from T20I WHERE Team = country ORDER BY RANDOM() LIMIT 11"
  playerLst = SQLdb.Query(query);
  //printf("Player List Size:%d",playerLst.size());
  printf("Selected Country%s\n", country);
 for(int i = 0; i < 11; i++)
 {
  m_pPlayerBtn[i]->setText(irr::core::stringw(playerLst[i]).c_str());
  //printf("%s\n",irr::core::stringw(playerLst[i]).c_str());
  cout<<query.c_str()<<endl;
 }
}

How to pass the full string value in to the function?

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