C / C++ / MFC

Re: Help With Control Focus

17-Mar-04 4:53

Does the button follow the edit control in the z-order?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Jack Reed19-Mar-04 9:38

Jack Reed

19-Mar-04 9:38

Yes, it does.

Thank you for your response. I did a little more research and found the answer to my riddle. I used PreTranslateMessage() to capture the tab button being pressed and then I set focus to the child controls of my control accordingly.

what does "rhs" mean?

Bash17-Mar-04 4:23

Bash

17-Mar-04 4:23

Hi,

I recently started learning pure C++ and want to know what does "rhs" mean?

For example:

class MyClass
{
public:
MyClass& operator=(const MyClass& rhs);
};

I've investigated that "rhs" is frequently-used in operator overloaders in C++ classes. What is "rhs"? May I use another word (for example, "dog") instead "rhs"?

Sorry for stupid question.

Yours sincerely,
Alex Bash

Re: what does "rhs" mean?

TFrancis17-Mar-04 4:27

TFrancis

17-Mar-04 4:27

rhs = Right Hand Side. And yes, you can use anything you want, but rhs is normally used because it does a good job of describing the fact that the parameter will be on the right hand side of the = sign.

Tim

Re: what does "rhs" mean?

hph17-Mar-04 4:28

hph

17-Mar-04 4:28

hi,

"rhs" is just the name of the input parameter, you can also use "cat" if you want, but only if you like cats Wink | ;-)

Have a nice day!
hph

Including project files from library

Cedric Moonen17-Mar-04 4:19

Cedric Moonen

17-Mar-04 4:19

Hi !

I need to design a class that will encapsulate an ActiveX object (a chart control). I want to put these files (the .h and the .cpp files) in a library common to all of my projects so I can reuse this class.
The problem is that the files for the ActiveX object need to be in the project directory (I use Add To Project->Components and Control to add the ActiveX to my project).
Is there a macro that I can use like the following way:

#include "CURRENT_PROJECT_DIRECTORY\CChart.h"

in order to access the current project directory from a file within my library ??

The files for the ActiveX cannot be copied in the library. Any idea ??

OpenProcess

hph17-Mar-04 4:03

hph

17-Mar-04 4:03

Hello,

can someone tell me the meaning of the SYNCHRONIZE flag which can be used in OpenProcess ?

Thanks in advance!

Re: OpenProcess

gUrM33T17-Mar-04 14:57

gUrM33T

17-Mar-04 14:57

This flag allows you to use the process handle in any of the wait functions to wait for the process to terminate. BTW, it is available in Windows NT/2000 or later only.

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

Windows NT Device Driver and PCI Bus access on Windows NT

BhaskarBora17-Mar-04 3:57

BhaskarBora

17-Mar-04 3:57

Hi there

I am in need for the following information.

1. Any specific link where i can find info for writing Device-Drivers on Win NT.
2. Link where PCI bus access on Win NT is explained.

thanks in advance...
Bhaskar...

___________________________
When a thing is new, people say, "It's not true." Later, when its truth becomes obvious, people say, "It's not important." Finally, when its importance cannot be denied, people say, "Well, it's not new."

How to creat a graphical back ground and button on a dialog class in MFC?

flow555517-Mar-04 2:58

flow5555

17-Mar-04 2:58

Hey there everyone,

I am a new member of the forum and relatively new to MFC. What I like to know how to create a graphical background and button.

If anyone can gave a specific example or link that will help, it will be very apperciated.

Thanks, Smile | :)

Re: How to creat a graphical back ground and button on a dialog class in MFC?

David Crow17-Mar-04 4:33

Sharing data among Threads

17-Mar-04 4:33

See if either of these help:

http://www.voidnish.com/articles/ShowArticle.aspx?code=bmpdlg01
http://www.flounder.com/bitmapbutton.htm

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Cedric Moonen17-Mar-04 2:44

Cedric Moonen

17-Mar-04 2:44

Hello all!

I have a project designed with the MFC document/view architecture. In the App idle time I read some data from a data source (I call a function of my doc class). This data will be displayed in a chart.
But I need also to make some computation on this data but I want to make this in a separate thread (the computation take some times and it cannot stop the reading of the data).
When I start the new Thread, I pass a pointer to my document so it can access data and the data will be stored in a buffer (FIFO buffer).
I was wondering if this is safe to do such a thing ?

Something like that:

BOOL CMyAppDoc::idle()
{
   // read data here
   pFIFOBuffer->AddData(Data);
}

And in the thread function:

//....
pMyDoc->ComputeData();
//...

void CMyAppDoc::ComputeData()
{
    while (TRUE)
        if (pFIFOBuffer->GetData(Data))
            ProcessData(Data);
}

Thanks

Re: Sharing data among Threads

GuimaSun17-Mar-04 3:13

GuimaSun

17-Mar-04 3:13

Some tips:

You must use code to protect multiple multithreading access to any shared data, like critical sections:
CRITICAL_SECTION cs;
InitializeCriticalSection( &cs );
...
EnterCriticalSection( & cs );
shared data access
LeaveCriticalSection( & cs );

You can also use Event primitives to signal end processing, like: CreateEvent, SetEvent, ResetEvent and WaitForSingleObject.

Good luck Smile | :)

GuimaSun
www.nexsun.com.br

Re: Sharing data among Threads

Cedric Moonen17-Mar-04 3:31

Cedric Moonen

17-Mar-04 3:31

Thanks !
Yes I think I will use the critical section, that's easy to use and fit perfectly with my needs.

Thanks Smile | :)

URL opens application

Florin Ochiana17-Mar-04 1:49

Florin Ochiana

17-Mar-04 1:49

Hi,

I want to put in a site links that would start my application. Something like yahoo has in the profile pages:

ymsgr:sendIM?yahoouser

I know how to make a handle that will send the call to my app using something like myapp:command?parameter but what do I have to do in my app to catch that command and get the parameter?

Thanks

-----
We are what we repeatedly do. Excellence, then, is not an act, but a habit.

How to use CheckMenuItem()????????

Anonymous17-Mar-04 1:46

17-Mar-04 1:46

Hi I would like to palce a check mark for menu item, if user clicks a menu item. I would like to do this from CMainFrm class.Can u please give me an idea?

Thanks
JP Poke tongue | ;-P

Florin Ochiana17-Mar-04 2:00

Florin Ochiana

17-Mar-04 2:00

You have to have a function that would execute the code when the users selects the menu item.

Let's say it's

ON_COMMAND(ID_YOURMENUITEM, TestFn)

Maybe you want to use a global variable that will tell you the state of that item.

bool testVar;

void TestFn() {
CMenu *m_MainMenu;
// let's say you have your menu in m_MainMenu

if (testVar) {
testVar = false;
m_MainMenu->GetSubMenu(1)->GetSubMenu(x)->CheckMenuItem(n, MF_BYPOSITION | MF_UNCHECKED);
} else {
testVar = true;
m_MainMenu->GetSubMenu(1)->GetSubMenu(x)->CheckMenuItem(n, MF_BYPOSITION | MF_CHECKED);
}
}

where n is the position of your item in the menu

-----
We are what we repeatedly do. Excellence, then, is not an act, but a habit.

Anonymous17-Mar-04 2:10

17-Mar-04 2:10

Hey
In above example, m_MainMenu is unreferenced..so that code is not working. How to attach my Mainmeu to this?

Thanks
JP

Florin Ochiana17-Mar-04 2:19

Florin Ochiana

17-Mar-04 2:19

I told you that m_MainMenu is your menu. You will have to replace it with your variable.

If it's the apps menu then you have to do something like this
m_MainMenu = GetMenu();

-----
We are what we repeatedly do. Excellence, then, is not an act, but a habit.

Thank u very much!!

Anonymous17-Mar-04 2:39

17-Mar-04 2:39

Thank u very much!!

Maximilien17-Mar-04 2:33

Maximilien

17-Mar-04 2:33

Use the ON_UPDATE_COMMAND_UI message if possible.

...
ON_UPDATE_COMMAND_UI(IDM_YOUR_MENU_ITEM, OnUpdateYourMenuItem)
...

void CMainFrm::OnUpdateYourMenuItem(CCmdUI* pCmdUI) 
{
  pCmdUI->SetCheck( IsMenuItemCheck() );
}

Maximilien Lincourt
Your Head A Splode - Strong Bad

cin >> question

ns17-Mar-04 1:16

17-Mar-04 1:16

I am reading from 2 datafiles with three entries:

File 1:
--------
abc
def
ghi
--------

file 2: has an extra blank line after ghi
---------
abc
def
ghi

--------

If I have an ifstream object 'fin' and I do

char val;
while (!fin.eof())
{
fin >> val;

cout << val;
}

For file 1 I get the output as
abc
def
ghi

as expected.

But for file 2 I get

abc
def
ghi
ghi

1.Why is this?

2.How can I prevent it from processing any extra blank lines?

thanks,
ns

Re: cin >> question

David Crow17-Mar-04 2:27

17-Mar-04 2:27

Using getline() might help.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: cin >> question

Anonymous17-Mar-04 22:11

17-Mar-04 22:11

use cin.get()....or create cstyle file operations...
create FILE*....
use fgetc(fp)....

Re: cin >> question

David Crow19-Mar-04 3:25