C / C++ / MFC

16-Oct-06 10:21

im trying to create a thread to listen on a port for incomming data but i keep getting errors

HANDLE Handle_Of_listener = 0;
Handle_Of_listener = CreateThread( NULL, 0, listener, &s, 0, NULL);
when i try to compile that it returns:
.\main.cpp(34) : error C3867: 'Messenger::listener': function call missing argument list; use '&Messenger::listener' to create a pointer to member

soo i do what it says and create a pointer to my listener() function

Handle_Of_listener = CreateThread( NULL, 0, &listener, &s, 0, NULL);

errors:
.\main.cpp(34) : error C2276: '&' : illegal operation on bound member function expression

i mean come on i do what it tells me to the says it's illegal!!

Mark Salsbery16-Oct-06 10:36

16-Oct-06 10:36

The problem is not in the CreateThread() call.
It's in the declaration of Messenger::listener

How are you declaring that function in your Messenger class?

EDIT: It should be

static DWORD WINAPI listener(LPVOID lpParam);

Mark

xJorDyx18-Oct-06 11:51

18-Oct-06 11:51

i am now getting this error when i declared it as
static DWORD WINAPI listener(SOCKET s)
.\main.cpp(34) : error C2664: 'CreateThread' : cannot convert parameter 3 from 'DWORD (__clrcall *)(SOCKET)' to 'LPTHREAD_START_ROUTINE'

Mark Salsbery18-Oct-06 12:03

Re: creating a thread [modified]

18-Oct-06 12:03

You want to pass the SOCKET to the thread procedure correct?

Declare your class-member thread procedure as

static DWORD WINAPI listener(LPVOID lpParam);

Write the function something like this:

DWORD WINAPI myclass::listener(LPVOID lpParam)
{
	SOCKET s = (SOCKET)lpParam;

	... do stuff with the socket...

	return 0;//
}

Create the thread something like:

HANDLE Handle_Of_listener_thread = 0;
Handle_Of_listener_thread = CreateThread( NULL, 0, listener, (LPVOID)s, 0, NULL);

Better?

Mark

xJorDyx19-Oct-06 9:08

19-Oct-06 9:08

thank you!
i shall try this as soon as i get home!

-- modified at 16:06 Thursday 19th October, 2006
still getting stupid errors
main code: (some part removed)

// Messenger class!
ref class Messenger : public Form
{
public:
static DWORD WINAPI listener(LPVOID lpParam);//line 26
SOCKET s;
bool conected;
HANDLE Handle_Of_listener;
Messenger()
{
InitForm();
if(ConnectToHost(1234,"127.0.0.1") == true)
{
printf("conected!");
conected = true;
HANDLE Handle_Of_Thread_1 = 0;
Handle_Of_listener = CreateThread( NULL, 0, listener, &s, 0, NULL);//line 38

}

}
static String ^myUsrName;

private:
// Win controls, Icon & Menu
RichTextBox ^ MessengerTxtR;
RichTextBox ^ MessengerTxtS;
array<Button^>^ MessengerButtons;
static String^ s_strZero = String::Format("0{0}0", System::Globalization::NumberFormatInfo::CurrentInfo->NumberDecimalSeparator);

System::Drawing::Icon^ m_pCalcIco;

MainMenu^ m_pMessengerMenu;
MenuItem^ m_pFileMenu;
MenuItem^ m_pAboutMenu;
MenuItem^ m_pExitMenu;
public:

DWORD WINAPI listener(LPVOID lpParam)//line 62
{//line 63
SOCKET s = (SOCKET)lpParam;
return 0;
}

error:
.\main.cpp(26) : warning C4441: calling convention of '__stdcall ' ignored; '__clrcall ' used instead
.\main.cpp(63) : warning C4441: calling convention of '__stdcall ' ignored; '__clrcall ' used instead
.\main.cpp(63) : error C2686: cannot overload static and non-static member functions with the same parameter types
.\main.cpp(26): could be 'DWORD Messenger::listener(LPVOID)'
.\main.cpp(62): or 'DWORD Messenger::listener(LPVOID)'
.\main.cpp(38) : error C2664: 'CreateThread' : cannot convert parameter 3 from 'DWORD (__clrcall *)(LPVOID)' to 'LPTHREAD_START_ROUTINE'
None of the functions with this name in scope match the target type

xJorDyx24-Oct-06 7:13

24-Oct-06 7:13

see post above

Image

messages16-Oct-06 8:52

messages

16-Oct-06 8:52

I have a Image on my dialog this picture is on the WM_ERASEBKGND and its work fine but I have a problem
when I move my program or if I move a program on my program then Mem Usage of my program increase How can I solve this problem. And I have another question
if I use of a code like this on WM_PAINT It increase PF Usage and Mem Usage of my program or no

<br />
void CMyPicture::OnPaint()<br />
{<br />
CPaintDC dc(this); <br />
	CRect rect(0,650,830,520);<br />
	CBrush m_Brush2;<br />
m_Brush2.CreateSolidBrush(RGB(255,255,255));<br />
	dc.FillRect(&rect,&m_Brush2);<br />
	m_Brush2.DeleteObject();<br />
}<br />

Thanks

Mark Salsbery16-Oct-06 9:01

16-Oct-06 9:01

messages wrote:
if I use of a code like this on WM_PAINT It increase PF Usage and Mem Usage of my program or no

Are you leaking resources in your WM_ERASEBKGND handler??

messages16-Oct-06 9:25

messages

16-Oct-06 9:25

Thanks for your help I used of this code but when I move a program Mem Usage of my program on TaskManager increase
Is it problem does my code has problem

I read Image on with

m_Image.Load<code> OnInitDialog() method<br />
<code><br />
<br />
BOOL CMyPicture::OnEraseBkgnd(CDC* pDC)<br />
{<br />
Image.BitBlt(pDC->m_hDC,0,0,593,420,0,0,SRCCOPY);<br />
return TRUE;<br />
}<br />

my code is this only but I have this problem
Thanks

Mark Salsbery16-Oct-06 9:38

16-Oct-06 9:38

Hmmm are you sure that's all you do in OnPaint() and OnEraseBkgnd()?

Your OnEraseBkgnd() wouldn't compile as you've shown it here.

Mark

viliam16-Oct-06 9:03

viliam

16-Oct-06 9:03

It's ok
probably you don't neet to call DeleteObject
(destructor will do it for you)
Anyway, for your example is better use FillSolidRect()
and you dont have to worry about memory at all

viliam

messages16-Oct-06 9:26

messages

16-Oct-06 9:26

Thanks for your help But why Mem Usage of my program increase can you help me
Thanks

C++ Winsock/Network Programming Help Please

Christian Graus16-Oct-06 10:10

Christian Graus

16-Oct-06 10:10

If you want this question answered, you need to post some code. The IDE will actually try to show you where the leaking memory was assigned, is it in your paint code at all ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

redirect input

viliam16-Oct-06 8:38

viliam

16-Oct-06 8:38

I am using STARTUPINFO structure to redirect stdin of console application
I am starting.
STARTUPINFO si;
si.dwFlag = START_USESTDHANDLES;
si.hStdInput = myHandle;

but i need to redirect just STDIN and I dont know how?
What parameter should I use for si.hStdOutput , ... ?
Thank you

viliam

Re: redirect input

rupert_durans16-Oct-06 22:56

rupert_durans

16-Oct-06 22:56

hello,
i'm still a newbie but
try this one: http://www.codeproject.com/threads/redir.asp

i need to learn more... i want to be like you guys... i'm just a begginer

Re: redirect input

David Crow17-Oct-06 5:17

David Crow

17-Oct-06 5:17

See here and here.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Phoenix10116-Oct-06 8:24

Phoenix101

16-Oct-06 8:24

Hey good people,
I'm a 2nd year IT student and i desperately need some help on how to implement network capability into my programs Sigh | :sigh:

.
I got some tutorials on winsock2 but i dont know where to start. The tutorials i got all assume you already a genius programmer. If anyone know where i can get some winsock2 tutorials for beginners please forward me a mail if it's not to much to ask 205017517@cput.ac.za or if you can offer any help in this regard i would greately appreciate it.

Thank you everyone:

Phoenix

Mark Salsbery16-Oct-06 8:39

16-Oct-06 8:39

The MSDN library has much info...Here's a good place to start

Windows Sockets 2[^]

You don't need to necessarily be a "genius programmer" but it's so much easir if you have at least
basic knowledge of Windows programming for messaging and user interface plus knowledge of the
network protocol(s) you'll be using. Sockets is the easy part Smile | :)

Mark

Zac Howland16-Oct-06 8:40

Zac Howland

16-Oct-06 8:40

Do you have any C/C++ programming experience? You said you are a beginner, so you will probably want to work on basic C/C++ programming before you jump into network programming, otherwise you are likely to be writing code and have absolutely no idea what it does ... which will make it impossible to debug.

If you insist on jumping into network programming anyway, try this link to get you started.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

normanS16-Oct-06 9:49

normanS

16-Oct-06 9:49

Try searching on . . . CodeProject . . .

I had a look at http://www.codeproject.com/internet/WinSockIntro01.asp[^] and http://www.codeproject.com/internet/winsockintro02.asp[^] recently (but I didn't get around to doing anything with them.)

Look at those articles or search for "socket", and pick one that looks interesting, and has a rating of 4 or higher.