C / C++ / MFC

13-Jul-04 20:51

One way is to trap WM_SETTEXT for the main window and insert the new logic there.

Another way is to act in WM_NCPAINT, when the title area is painted. I wouldn't do that though.

Look in the MFC sources how/where the default title is composed.

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Re: Main Window Title

V.13-Jul-04 20:56

13-Jul-04 20:56

Maybe GetWindowText(astring) and SetWindowText(astring) is an option, but I'm not sure you can get the whole string. you could try it and see.

Good luck.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: Main Window Title

Jeffrey Walton14-Jul-04 12:44

Jeffrey Walton

14-Jul-04 12:44

Hi Santosh,

I hope I'm on target with this.

In order to set the title of a document, hence the title of the MDI child window/main app window if the application is maximized, use CDocument::SetTitle().

You can call this in the view or in the document itself; the former would require GetDocument()->SetTitle(_T("Title"));

Jeff

help reg voice chat

Member 101812813-Jul-04 20:47

Member 1018128

13-Jul-04 20:47

hai,
i am doing a project on voice chat.I have some problems when it is used in the net.problems like echo,data loss.
(I had already posted this question and got the answer to use compression techniques)

My question is , is it necessary to go for VOIP concepts or just we can use compression techniques to solve that problem.

plz give some suggestions..

Thanks for all,

M.Kailasam

Main Window Title

«_Superman_»13-Jul-04 20:26

«_Superman_»

13-Jul-04 20:26

By default, in an MFC MDI application, when a child window is maximized, the
title of the child window is appended to the main window's title. Here I
want to display it in a custom format. How do I go about doing this ?

The application is an MFC MDI application.

The title bar text of the main window contains some values taken from a database.

So let's say the main title bar text is [Field1] - <field2> MainWindow

I have a MDI child window whose title bar text is Child1.

When the MDI child is maximized, the main window title will by default
become [Field1] - <field2> MainWindow - [Child1].

I want to change this and it should become - [Field1] - <field2> [Child1] -
MainWindow

Santosh

« Superman »

_T, _TCHAR and TCHAR

normus13-Jul-04 20:24

normus

13-Jul-04 20:24

I have seen people use these macros on string literals, what are these for?

User 58385213-Jul-04 20:38

User 583852

13-Jul-04 20:38

typedef WORD WCHAR;

#ifdef UNICODE
typedef WCHAR TCHAR;
#else
typedef char TCHAR;
#endif

so if UNICODE is defined TCHAR is WORD, else its char

Johann Gerell13-Jul-04 20:57

13-Jul-04 20:57

Josh Gray wrote:
so if UNICODE is defined TCHAR is WORD

A typo. You mean TCHAR is WCHAR, of course.

And WCHAR is wchar_t.

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Johann Gerell13-Jul-04 21:10

13-Jul-04 21:10

_T is not the same as _TCHAR or TCHAR in respect to functionality.

_T, TEXT and also L are used to convert string literals to wide or multi-byte type. While _T and TEXT converts to wide if UNICODE is defined and to multi-byte if UNICODE is undefined, L will always force the string literal to wide independent of the UNICODE define.

So,

_T("This will be a string of WCHAR characters "
   "if UNICODE is defined and of ordinary char "
   "characters if UNICODE is undefined.");

_T("This will also be a string of WCHAR characters "
   "if UNICODE is defined and of ordinary char "
   "characters if UNICODE is undefined.");

L"This, however, will always be a string of WCHAR characters.";

And WCHAR is just a wchar_t.

I highly recommend the article The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)[^] by Joel Spolsky.

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normus13-Jul-04 22:46

normus

13-Jul-04 22:46

Thanks. and what is a wide character wchar_t? the question is, when should I care to use these macros? or is it okay to not use them.
also, why do you use "L" like that - what does it expand to?

Johann Gerell14-Jul-04 0:39

14-Jul-04 0:39

Normus wrote:
what is a wide character wchar_t

A UNICODE character. It uses (mostly) 2 bytes of storage instead of 1. Therefore "wide".

Normus wrote:
when should I care to use these macros

If you ask me - always (I come from Europe, where old ASCII is insufficient). If you ask an American - "What's Europe?" Smile | :)

Seriously, if you want anyone who needs a UNICODE alphabet to use your code, then it better be UNICODE enabled.

Normus wrote:
why do you use "L" like that - what does it expand to

L forces UNICODE type of the string literal. For example, code that targets no other OS than Windows CE, which is a UNICODE OS from bottom to top, can use L on all string literals and be sure to always work.

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normus14-Jul-04 3:16

normus

14-Jul-04 3:16

dont worry, I am not an american either Smile | :)

Regarding L, I am curious about the C syntax. Is it an operator or a macro or what is it?

Thanks.

Johann Gerell14-Jul-04 3:57

How to interface System to External Hardware

14-Jul-04 3:57

I guess L is an MS compiler extension, because it's not a macro.

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zahoor ahmed13-Jul-04 20:08

zahoor ahmed

13-Jul-04 20:08

I want to do one project in VC++, that is in our Laboratory we are using one equipment for Blood Test & Urine Test that Equipment itself generating one report for us. But I want to connect that equipment to my system through Printer port and want to have control over equipment.This is my project brief description.
For to start this project I want some functions which will help to send the Data to equipment and to get response & Data from the equipment.kindly help.

Re: How to interface System to External Hardware

jhorstkamp13-Jul-04 23:24

jhorstkamp

13-Jul-04 23:24

The first thing to do is to find out if the equipment actually ACCEPTS commands through the printer port (which would be a little unusual - that type of control is usually done through a serial port). Are there any manuals for the equipment that describe the remote control capabilities and message and command formats? If so, then that is the place to start. Once you find out FROM THE MACHINE HOW IT WANTS TO TALK, then you can start the process of how to implement a communication protocol in VC++.

Hope this helps,

John

When to use PostQuitMessage ?

Hesham Amin13-Jul-04 19:47

Hesham Amin

13-Jul-04 19:47

Hi I careate a secondary worker thread in my application.
I read a sample that uses PostQuitMessage(0); to exit the thread..
But I know that I can just use return 0; instead..
when should each method be used ?

ThatsAlok13-Jul-04 20:09

ThatsAlok

13-Jul-04 20:09

hspc wrote:
I read a sample that uses PostQuitMessage(0); to exit the thread..
But I know that I can just use return 0; instead..

yes there are three way to end worker thread.
1.return(0);
2.AfxEndThread(0);
3.PostQuitMessage(0);

hope u understand

-----------------------------
"I Think It will Work"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

User 58385213-Jul-04 20:26

User 583852

13-Jul-04 20:26

i would use PostQuitMessage() when you want to stop the thread from another thead
for example if you have a CWinThread pointer called pAnotherThread

pAnotherThread->PostQUotMessage(0);
WaitForSingleObject(*pAnotherThread, INFINITE);

this will post the stop message and wait untill the thread has exited

However, if the thread is stopping itself then return(0) is fine
for example

void myThread(LPVOID)
{
while(workToDo)
{
doSomeWork();
}
return 0;
}

Hesham Amin13-Jul-04 20:52

Hesham Amin

13-Jul-04 20:52

Thank you

this made it clear.. Rose | [Rose]

ThatsAlok13-Jul-04 22:13

ThatsAlok

13-Jul-04 22:13

But
PostQuitMessage() function is not a part of CWinThread

here My VC 6.0 Compiler Error Message

D:\Alok\Currently Working\PhaseTwo\SecureNM9x\NMPClass.cpp(284) : error C2039: 'PostQuitMessage' : is not a member of 'CWinThread'<br />
        C:\Program Files\Microsoft Visual Studio\VC98\MFC\INCLUDE\afxwin.h(3791) : see declaration of 'CWinThread'<br />
Error executing cl.exe.<br />
<br />
SecureNM9x.exe - 1 error(s), 0 warning(s)

-----------------------------
"I Think It will Work"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk