Re: Creating a thread - C / C++ / MFC Discussion Boards

laiju15-Dec-05 23:54

15-Dec-05 23:54

Following is a funciton where I am calling a thread
void CMyView::OnInitialUpdate()
{
...
AfxBeginThread(Thread_ScanConnectionState, m_sComPort, THREAD_PRIORITY_NORMAL, NULL, NULL, NULL);
...
}

//Foll is the thread definition
UINT CMyView::Thread_ScanConnectionState(LPVOID pParam)
{
CString sComPort;
sComPort = static_cast<lpcstr> (pParam);
return 1;
}
The declaration of the thread in the class header of CMyView is as below.
UINT Thread_ScanConnectionState( LPVOID pParam );

I get the compilation error as given below
error C2665: 'AfxBeginThread' : none of the 2 overloads can convert parameter 1 from type 'UINT (LPVOID)'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\afxwin.h(4105): could be 'CWinThread *AfxBeginThread(AFX_THREADPROC,LPVOID,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\afxwin.h(4108): or 'CWinThread *AfxBeginThread(CRuntimeClass *,int,UINT,DWORD,LPSECURITY_ATTRIBUTES)'
while trying to match the argument list '(overloaded-function, CString)'
Please let me know the error.

laiju

Re: Creating a thread

Arman S.16-Dec-05 0:11

Arman S.

16-Dec-05 0:11

Hi,

First: AfxBeginThread takes a static function pointer. Yours is not a static function. IOW, make Thread_ScanConnectionState static.

Second: In the func nody you typed 'static_cast(pParam)': incorrect.
The correct is:
sComPort = static_cast<cstring> (pParam);

Third: Do not do extra typing: AfxBeginThread's default parameters work fine.
You need not pass THREAD_PRIORITY_NORMAL or the NULLs. Smile | :)

--
======
Arman

Re: Creating a thread

Arman S.16-Dec-05 0:21

Arman S.

16-Dec-05 0:21

Second: In the func nody you typed 'static_cast(pParam)': incorrect.
The correct is:
sComPort = static_cast (pParam);

Sorry, it seems the editor doesn't love static_cast's signature Smile | :)

--
======
Arman

Re: Creating a thread

toxcct16-Dec-05 0:35

toxcct

16-Dec-05 0:35

Arman Z. Sahakyan wrote:
Sorry, it seems the editor doesn't love static_cast's signature

the editor is just html, so don't use html tags...
<> are interpreted.
if you don't want it to, check the Ignore HTML tags in this message (good for code snippets) checkbox or use < > codes instead...

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

Re: Creating a thread

Arman S.16-Dec-05 1:02

Arman S.

16-Dec-05 1:02

Thanks.

--
======
Arman

Re: Creating a thread

laiju16-Dec-05 1:02

laiju

16-Dec-05 1:02

Thanx for the info. But i didnt know that the THREAD func needs to be static.Thanx anyway

laiju

Re: Creating a thread

Arman S.16-Dec-05 1:08

Arman S.

16-Dec-05 1:08

Note that thread function must be either global or a static class-method.
I wanted to say it cannot be a non-static class-method as you were using.

--
======
Arman

Re: Creating a thread

toxcct16-Dec-05 1:49

toxcct

16-Dec-05 1:49

when a function is a class member (except static ones), it receives an implicit parameter which is the this pointer. this implicit parameter changes the signature of what you see of your function in design mode...

for instance :

class A {
  public:
    void foo(int);
};

just considering the case of this function, its signature is in fact :

void A::foo(A*, int);

so, as AfxBeginThread() receives a function pointer, this parameter must implement a particuliar function signature, it must be exactly as you defined it. this is why your function must be global, or at least static (because static members don't know specific instances of a class - they are also known as class function)...

hope that helps...

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

ActiveX programming

a_david12315-Dec-05 23:24

a_david123

15-Dec-05 23:24

Please suggest beginner level tutorial(s) for ActiveX programming in VC++
thanks

david

bmp's

V.15-Dec-05 22:28

15-Dec-05 22:28

Hi guys,

I've been out for a while and now I have to adapt a program for an interview to test my skills. It's all bmp's, so opening, rotating, changing colors etc...

I've been searching a bit, but of course MSDN isn't helping and I couldn't really find something on CP either.

Can anybody point out a good tutorial or something?
I do know how bmp's are built (a header and then the colors row by row)

I'm really confused with CBitmap and HBITMAP (and if I'm not mistaken you've got a Bitmap and BITMAP too?)

tnx!
(PS: my interview is on monday so I've got a lot of studying to do)

No hurries, no worries.

Re: bmp's

ThatsAlok15-Dec-05 23:54

ThatsAlok

15-Dec-05 23:54

V. wrote:
Can anybody point out a good tutorial or something?

You will find this page intresting :-
http://priyank.in/formats.php[^]

"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

Re: bmp's

V.16-Dec-05 0:01

16-Dec-05 0:01

tnx man,

It's a bit basic 'cause I did work on bmp's, but that was some time ago. (I forgot they saved it backwards D'Oh! | :doh:

)
So your info was idd useful...

tnx

No hurries, no worries.

how to use "resource only dll"

kotiramkoteswararao15-Dec-05 22:23

kotiramkoteswararao

15-Dec-05 22:23

hi,

i have created one "resource only dll" . in that dll,i have stored some GIF files. Here i need some information,

How can i use those reources in application and how can i use those GIF files in my application and display them.

regards,
RamakakoteswaraRao

Spend every minute for success

Re: how to use &amp;quot;resource only dll&amp;quot;

David Crow16-Dec-05 3:05

David Crow

16-Dec-05 3:05

If the images were BMP format instead, you could use:

HINSTANCE hLibrary = Loadlibrary("MyResources.dll");
HANDLE hImage      = LoadImage(hLibrary, "MyImage" ...);

GIF images can still be loaded from the DLL, but with a bit more code:

HRSRC hResource  = FindResource(hLibrary, "MyImage", RT_RCDATA);
HRSRC hLoaded    = LoadResource(hLibrary, hResource);
char *lpResource = LockResource(hLoaded);
// now you can do something with the GIF bytes pointed to by lpResource

"Take only what you need and leave the land as you found it." - Native American Proverb

Process-wide API spying - Source Code?

devvvy15-Dec-05 22:01

devvvy

15-Dec-05 22:01

Any one has source code for this article? Process-wide API spying - an ultimate hack by Anton Bassov
?

Thanks in advance.

Norman Fung

help me pls

Petiao15-Dec-05 21:56

Petiao

15-Dec-05 21:56

i willing to do a system that can using 1 mouse and 1 keyboard to control another pc's mouse and keyboard, now i dun have any idea, who can help me pls?

nick

Re: help me pls

toxcct15-Dec-05 22:45

toxcct

15-Dec-05 22:45

trojan like ?
Poke tongue | ;-P

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

Re: help me pls

Eytukan16-Dec-05 2:24

Eytukan

16-Dec-05 2:24

unplug the mouse from the first computer then plug them into the other computer. this way you can control the other system. Cool | :cool:

"But your mind is very complex, very tricky. It makes simple things complicated. -- that's its work. And for centuries it has been trained for only one thing: to make things so complicated that your life becomes impossible."- Osho

<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">
--[V]--

Re: help me pls

toxcct16-Dec-05 2:54

toxcct

16-Dec-05 2:54

it won't work it the keyboard is PS/2... he'll have to restart the computer... Poke tongue | ;-P

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

Re: help me pls

Eytukan16-Dec-05 3:25

Eytukan

16-Dec-05 3:25

i meant before switching on the systems Poke tongue | ;-P

<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">
--[V]--

Re: help me pls

Sheng Jiang 蒋晟16-Dec-05 5:07

Sheng Jiang 蒋晟

16-Dec-05 5:07

ATAN has some hardware to swith that..

My blogs:

http://blog.joycode.com/jiangsheng
http://blog.csdn.net/jiangsheng
http://bloglines.com/public/jiangsheng

Command what is yours
Conquer what is not
---Kane

Re: help me pls

Petiao18-Dec-05 19:46

Petiao

18-Dec-05 19:46

what i want to do is just go through the network to control another pc's mouse and keyboard. example like i have 2 pc here, then i use 1 of the pc can control another pc mouse and keyboard only. izzit is go through by ip or? who know abt this?

nick

How to generate clock with higher freq at LPT ?

quangpk15-Dec-05 21:21

quangpk

15-Dec-05 21:21

Now I can generate a clock at one pin of LPT port, by the way using Outport() and Sleep(t), but t min = 1ms, so that I only generate max freq = 500 Hz. I want to ganerate clock with higher freq (about 10 to 100 kHz). How to do that ?
Pls help me.

Re: How to generate clock with higher freq at LPT ?

Cedric Moonen15-Dec-05 21:40

Cedric Moonen

15-Dec-05 21:40

quangpk wrote:
Sleep(t), but t min = 1ms, so that I only generate max freq = 500 Hz

False, it's even worse than that: as windows is not a real time OS, your 1 ms are likely to vary up to 15 msec (depending on a lot of things). So, you can't rely on Sleep for precise timings like that.

For the solution to your problem, I don't even know if this is possible to do that in windows. Maybe consider to move to a real-time OS (like eCOs,...). I don't know if this is possible for you. Even going at the driver level, I don't konw if this will be possible...

Can anyone help me with jms call in c language!

white jungle15-Dec-05 21:03

white jungle

15-Dec-05 21:03

Hi,Every one:
I just use jms lib to send message to jboss server.
And I useing C to do this work.
But I doubt there is memory leak when call jms api.
I have a test with create one instance of Message and set the message with new text context when sending the message.
After send 20000 messages,the memory requirement increase 2000K +.
I don't know where I am wrong.
So,please anyone can send me a sample with call JMS lib in C language.
(include create context,connection ,send message and destroy all instance)
Thank you very much!

Don't look at me in that way!

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