C / C++ / MFC Discussion Boards

Ignacio Varas2-Apr-02 0:03

2-Apr-02 0:03

hi,
the subject says all, i have a TCHAR, and i need convert it to managed string, i am using string.Copy(), but it does not works.
Any body knows any way?
Thanks in Advance

Salamanca 2002 Capital Cultural Europea, Visitala

Re: Converts TCHAR to Managed String

2-Apr-02 2:31

I didn't understand your question completely.

why don't you use CString in MFC.

Thanks
--Maya

Re: Converts TCHAR to Managed String

Le centriste2-Apr-02 6:44

Le centriste

2-Apr-02 6:44

He probably wants to use the string in a managed environment, like .NET.

Michel

If I am wrong or said something stupid, I apologize in advance Wink | ;)

Re: Converts TCHAR to Managed String

Tim Smith2-Apr-02 7:28

Tim Smith

2-Apr-02 7:28

I thought the "to Managed String" part was a dead giveaway.

Smile | :)

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

how to Maximize control ?

2-Apr-02 0:01

Hi,

I have an SDI project, My View is derived from CFormView which contain a list box and some other controls.
I would like to maximize (and not only to center) the list box and the other controls when the user maximize the application windows .

How can i do it ?

Thanks.

Re: how to Maximize control ?

2-Apr-02 1:06

Add a handler for WM_SIZE in your CFormView derived class. Then use SetWindowPos(...) on your different controls. (You'll have to assure the controls have been created, cause this function will be called once before the controls have been attached to any window handles.)

How can I retrieve the documents icon?

AmarB2-Apr-02 0:02

AmarB

2-Apr-02 0:02

Hi everybody,

I want to get the documents´ icon in a MDI application. When I try to use GetIcon() from CMDIChildWnd HICON is a null pointer. Also when I try to use GetIcon() from CMDIFrameWnd it returns NULL.
By the way I use this in my windows-recorder...

Any ideas?
Amar

Re: How can I retrieve the documents icon?

Mukkie2-Apr-02 5:25

Mukkie

2-Apr-02 5:25

Hi!

Maybe try to get CDocTemplate from CDocument, then access m_nIDResource attribute: LoadIcon(nIDResource). This attribute is not accessible, so You may need to derrive class from CDocTemplate (CMultiDocTemplate to be exact) in order to access this attribute.

Hope this helps

Mukkie

Toolbar in ActiveX control

Tzoockee1-Apr-02 23:44

Tzoockee

1-Apr-02 23:44

I want to make an ActiveX control with VC++ (MFC). This control should have a toolbar.
How can I do that ? I tried to create the toolbar like this:

if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
{
TRACE0("Failed to create toolbar\n");
return -1; // fail to create
}

This is how it is createed in an standard MFC (.exe) SDI project. This doesn't work. (no error, but the toolbar doesn't appear).

Tzoockee

Re: Toolbar in ActiveX control

KaЯl2-Apr-02 4:44

KaЯl

2-Apr-02 4:44

You may find this article from MSDN useful:

"HOWTO: Add Toolbars and Tooltips to ActiveX Controls (Q194294)

HTH,

K.

It's funny how we get started.
They get their money from the things on you.
They get your money and the girls and the fame.
I only do it for the fun.
That's my game.

KoRn, "Counting"

Message Removed

1-Apr-02 22:42

Message Removed

Re: Strings and strange characters

Joaquín M López Muñoz1-Apr-02 22:44

Joaquín M López Muñoz

1-Apr-02 22:44

strncpy does not append the terminating null character when the copy runs up to the maximum number of characters specified in the third parameter. Replace your last two lines with:

int nLen=strlen(strExePath) - strlen(pdest);
strncpy(strIniPath, strExePath, nLen);
strIniPath[nLen]='\0';
strcat(strIniPath, ".ini");

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Strings and strange characters

1-Apr-02 23:51

Thank you for your clear answer !

Re: Strings and strange characters

Michael Dunn2-Apr-02 4:46

Michael Dunn

2-Apr-02 4:46

One other note - your arrays should be MAX_PATH in size, not 256.

--Mike--
"Jobs that don't allow you to visit the Lounge 25 times a day at the minimum are not worth having anyway."
-- Nish, 3/28/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan and Jamie Salé.

Strings and strange characters

1-Apr-02 22:37

Hi,

Oups sorry, bad post !!

1-Apr-02 22:47

;o)
Sorry

Hey-now to all registry Gurus!

BlackSmith1-Apr-02 22:29

BlackSmith

1-Apr-02 22:29

HOWTO: Iterate values/data inside a registry section?

--BlackSmith--

"With the help of all mighty", 2001, Me.

Re: Hey-now to all registry Gurus!

Jon Hulatt1-Apr-02 23:35

Jon Hulatt

1-Apr-02 23:35

DWORD status;
HKEY hKey;
DWORD dwIndex=0;

status=RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SOFTWARE\\Whatever\\Key",0,
                KEY_ALL_ACCESS, &hKey);

if (status != ERROR_SUCCESS)
   //handle the error;


do {
  status=RegEnumValue(hKey, dwValue, 
  // etc, you can read MSDN as well as I can

  dwIndex++;
} while (dwIndex != ERROR_NO_MORE_ITEMS);


RegCloseKey(hKey);

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Memory management

Dominik Reichl1-Apr-02 22:21

Dominik Reichl

1-Apr-02 22:21

Hi
if i allocate 2 new char arrays like:

char *pChars1 = new char[8];
char *pChars2 = new char[10];

can i be SURE (i.e. nothing other may happen) that when i use pChars1[8] get the first char of the second array (= pChars2[0])?
For example think of a string which is 7 chars long. Then i set pChars1[7] non-NULL. Then a string-read at the start of pChars1 would give the string consisting of the first and the second array?
If this is not possible, is there a compiler-switch to make this work?

Thanks
Dominik

Re: Memory management

Christian Graus1-Apr-02 22:26

Christian Graus

1-Apr-02 22:26

No way, no how. Instead you'd need to do this:

char * pChars1 = new char[18];
memset(pChars, 0, 18);
char * pChars2 = pChars1+8;

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

Re: Memory management

Jon Hulatt1-Apr-02 23:40

Jon Hulatt

1-Apr-02 23:40

To expand a little on Chris' answer:

When you ask for 8 char's of memory, thats all you get. You have no control over how the Runtime environment allocated that, and you don't need it. If you need two logical blocks of memory to be next to each other, then allocate one (bigger) block.

if you allocate a char[8], then referring to element 8 of that array (which you don't own, you own 0-7), is technically a protection fault. Whether or not it crashes your program is a matter of the alignment of the planets.

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Multithreading Synchronization

1-Apr-02 21:19

Hi,

I use VC++ 6.0 (SP5) (i use MFC), and wish to design a multithreaded application.
I have the following problem :

for (int i = 0; i < N; i++)
{

// Launch may be 4 or 5 threads
AfxBeginThread(thread1);
AfxBeginThread(thread2);
AfxBeginThread(thread3);
AfxBeginThread(thread4);

}

but i would like to execute ONLY ONE thread at time. (if i do not synchronize them, i will have 4*N threads at the same time !!!).
I am confused : what should i use : CSemaphore, CEvent, WaitForSingleObject(), WaitForMultipleObjects()....

Can you help me !

Thanks.

Re: Multithreading Synchronization

Joaquín M López Muñoz1-Apr-02 21:28

Joaquín M López Muñoz

1-Apr-02 21:28

Have the ThreadFuncs of the threads synchronized with a CRITICAL_SECTION (the same for all of them). This post of mine shows a convenient way to do synchronization with these objects.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Multithreading Synchronization

Jon Hulatt1-Apr-02 23:41

Jon Hulatt

1-Apr-02 23:41

Bit confused. If you want only one thread running at a time, you could always not bother with threads and be single-threaded. That way you only get one thread running at once. Surely you're missing the point of multi-threading if you block them all to single thread execution?

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: Multithreading Synchronization

Tim Smith2-Apr-02 2:11

Tim Smith

2-Apr-02 2:11

You can create each thread in suspended state and then resume them one by one waiting for each to finishing.

But like someone else siad, why create threads if you are just going to serialize execution.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

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