C / C++ / MFC Discussion Boards

satsumatable30-May-06 18:01

30-May-06 18:01

I'm using following statement to create a new thread,

AfxBeginThread(SocketConnection,this);

Method to be invoked

UINT SocketConnection(LPVOID pParam)
{
return 0;
}

But i'm getting the following error message; whats wrong with my code how to resolve it

'AfxBeginThread' : none of the 2 overloads can convert parameter 1 from type 'UINT (LPVOID)'

Re: AfxBeginThread- Error

_AnsHUMAN_ 30-May-06 18:13

_AnsHUMAN_

30-May-06 18:13

Have you defined the Thread function SocketConnection in the header file of the class.
If yes remove the function declaration in the header file and then try and compile your code.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: AfxBeginThread- Error

satsumatable30-May-06 18:16

satsumatable

30-May-06 18:16

No it says UnDeclare Identifier

AfxBeginThread(SocketConnection,this);

UINT static SocketConnection(LPVOID pParam)
{
return 0;
}

Error Message

error C2065: 'SocketConnection' : undeclared identifier

Re: AfxBeginThread- Error

_AnsHUMAN_ 30-May-06 18:22

_AnsHUMAN_

30-May-06 18:22

Your need to define the function before you call this . SO check it.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: AfxBeginThread- Error

satsumatable30-May-06 18:38

satsumatable

30-May-06 18:38

Thanks alot this simple issue put down everything more than a hour for me.

Re: AfxBeginThread- Error

Hamid_RT30-May-06 18:36

Hamid_RT

30-May-06 18:36

maybe it is some helpful to you
it work.

<br />
UINT MyThread( LPVOID pv );<br />
...<br />
...<br />
<br />
void CMyAnswer::RunThread()<br />
{<br />
CWinThread* m_Thread;<br />
<br />
m_Thread=AfxBeginThread ( MyThread, this,THREAD_PRIORITY_NORMAL,0,CREATE_SUSPENDED);<br />
if (m_Thread != NULL)<br />
m_Thread->ResumeThread();<br />
}<br />
<br />
<br />
UINT MyThread( LPVOID pv )<br />
{<br />
CMyAnswer* m_Answer = (CMyAnswer*) pv;<br />
<br />
m_Answer->Modify();<br />
<br />
return 0;<br />
}<br />
<br />
void CMyAnswer::Modify()<br />
{<br />
}<br />

whitesky

Re: AfxBeginThread- Error

_anil_30-May-06 19:16

_anil_

30-May-06 19:16

you forgot static Big Grin | :-D

Regards
Anil

Re: AfxBeginThread- Error

Hamid_RT30-May-06 19:23

Hamid_RT

30-May-06 19:23

static why?

whitesky

Re: AfxBeginThread- Error

ThatsAlok30-May-06 20:30

ThatsAlok

30-May-06 20:30

WhiteSky wrote:
static why?

Actually Class Function which is going to used as Thread, is decalred as STATIC to save it from Object Boundation!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: AfxBeginThread- Error

Hamid_RT30-May-06 20:50

Hamid_RT

30-May-06 20:50

Thanks Mr Alok Gupta Smile | :)

whitesky

Re: AfxBeginThread- Error

ThatsAlok30-May-06 20:28

ThatsAlok

30-May-06 20:28

_anil_ wrote:
you forgot static

If Function Declared In Class is going to used at Thread, then it declared Static otherwise not

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

Re: AfxBeginThread- Error

_anil_30-May-06 20:53

_anil_

30-May-06 20:53

Thanks

Regards
Anil

Re: AfxBeginThread- Error

Nibu babu thomas30-May-06 19:22

Nibu babu thomas

30-May-06 19:22

The definition function for the function SocketConnection should be at the top of the file if it's not declared before the AfxBeginThread statement.

//write this function first
UINT SocketConnection(LPVOID pParam)
{
return 0;
}
 

void CSomeClass::SomeMethod()
{ 
  //and then this
  AfxBeginThread(SocketConnection,this);
}

Nibu thomas
A Developer

Programming tips[^] My site[^]

Re: AfxBeginThread- Error

NiceNaidu30-May-06 19:46

NiceNaidu

30-May-06 19:46

You are right Nibu. This is allowed in C++, but not in C.

Appu..
"If you judge people, you have no time to love them."

Re: AfxBeginThread- Error

Nibu babu thomas30-May-06 19:49

Nibu babu thomas

30-May-06 19:49

NiceNaidu wrote:
This is allowed in C++, but not in C.

It's allowed only if you have a declaration before the function is referenced.

Nibu thomas
A Developer

Programming tips[^] My site[^]

Re: AfxBeginThread- Error

satsumatable30-May-06 20:13

satsumatable

30-May-06 20:13

Here is my small issue

SocketThread = AfxBeginThread(ReceiveMessage,this);

UINT static ReceiveMessage(LPVOID pParam)
{
return 0;
}

Since i'm not defining this class inside the Header file i'm not able to access any controls and its values. Previously i had as like below

strSocketData.SetWindowText (strResult);
//strSocketData is a control variable.

How can i access it in my "ReceiveMessage" method.

Re: AfxBeginThread- Error

Nibu babu thomas30-May-06 20:22

Nibu babu thomas

30-May-06 20:22

sivaprakashshanmugam wrote:
Since i'm not defining this class inside the Header file i'm not able to access any controls and its values.

sivaprakashshanmugam wrote:
Previously i had as like below

strSocketData.SetWindowText (strResult);
//strSocketData is a control variable.

How can i access it in my "ReceiveMessage" method.

UINT RecieveMessage( LPVOID pParam )
{
   //Disclaimer: It's not at all safe to pass around MFC objects. Instead you can pass around HWND's which is safe.
 
   CYourDlg* pYourDlg = reinterpret_cast< CYourDlg* >( pParam );
   pYourDlg->strSocketData.SetWindowText( pYourDlg->strResult );
}
 
SocketThread = AfxBeginThread(ReceiveMessage,this);

Hope this helps? Unsure | :~

Nibu thomas
A Developer

Programming tips[^] My site[^]

Re: AfxBeginThread- Error

satsumatable30-May-06 20:33

satsumatable

30-May-06 20:33

Yes it sounds Good... i can able to read and write data.

Shall use this?. Is it it advisable?. Make sure i'm using it in MFC Activex control. You mentioned that it is not safe is there anyother alternate.

CYourDlg* pYourDlg = reinterpret_cast< CYourDlg* >( pParam ); pYourDlg->strSocketData.SetWindowText( pYourDlg->strResult );

Re: AfxBeginThread- Error

Nibu babu thomas30-May-06 20:46

Nibu babu thomas

30-May-06 20:46

sivaprakashshanmugam wrote:
Yes it sounds Good...

Well did it work? Sniff | :^)

sivaprakashshanmugam wrote:
You mentioned that it is not safe is there anyother alternate.

No it's not at all thread safe to pass around MFC objects. Instead pass the HWND of your dialog. Then use SetDlgItemText to set the text for the item.

SetDlgItemText( hDialog, IDD_DIALOGCONTROL_ID, _T( "This is thread safe" ));

Well you cannot retrieve the strResult parameter too. To get around this store the buffer of strResult inside another pointer. Put both the handle to the dialog and the pointer to the buffer inside the struct and then pass this struct object to the thread.

Nibu thomas
A Developer

Programming tips[^] My site[^]

Progress bar

KongHL30-May-06 15:20

KongHL

30-May-06 15:20

How do i know the progress of a DLL and display it? do i have to implement a progress bar? if so, how?

THks

Re: Progress bar

led mike30-May-06 17:15

led mike

30-May-06 17:15

KongHL wrote:
How do i know the progress of a DLL and display it?

DLL's can evolve (progress) into EXE's over the course of a project or the lifetime of the product. Generally the rate of change would be too slow to display in a progress bar.

"What classes are you using ? You shouldn't call stuff if you have no idea what it does"
Christian Graus in the C# forum

led mike

Re: Progress bar

KongHL30-May-06 19:12

KongHL

30-May-06 19:12

Is it possible to mark certain percentage of completion?

Re: Progress bar

led mike31-May-06 4:36

led mike

31-May-06 4:36

That's what a progress bar is for. I must not understand your question.

Re: Progress bar

Anilkumar K V30-May-06 19:40

Anilkumar K V

30-May-06 19:40

Can we have any access to DLL loading process and display/update it in progress bar?

Re: Progress bar

led mike31-May-06 4:43

led mike

31-May-06 4:43

Depends on what you mean by "loading". The OS loader is going to load a DLL so fast you don't need to show progress. Now if you initialization stuff in the DLL (like running database queries) that you want to show progress for you have to supply an interface for obtaining that progress information.

There is no magical way to show progress because, progress of "what". You have to account for the knowledge of the "what". That is your job as a programmer. It is sometimes referred to as "the domain". Check it out[^]

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.