C / C++ / MFC

Re: Ask about random number

26-Sep-02 1:03

Create vector of integers containing 400,000 elements and initialize it with ordered values from 1..400,000 range. Call std::random_shuffle. Make some coffee and wait.

Tomasz Sowinski -- http://www.shooltz.com

*** Vodka. Connecting people. ***

jmkhael26-Sep-02 1:37

jmkhael

26-Sep-02 1:37

i vote for a Vodka!

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

draw text with text size problem

chen26-Sep-02 0:46

chen

26-Sep-02 0:46

Hi,

I trying to draw a text on a button. I have code:

-------------------------------------------------------
CRect re = di->rcItem;
CBitmap cbm, *obm;
CDC cdc, mdc;
CFont *cf;

cdc.Attach(di->hDC);
mdc.CreateCompatibleDC(&cdc);
cbm.CreateCompatibleBitmap(&cdc, re.Width(), re.Height());
obm = mdc.SelectObject(&cbm);
mdc.FillSolidRect(re, GetSysColor(COLOR_BTNFACE));
mdc.SetBkMode(TRANSPARENT);
mdc.SetTextColor(m_textcol);
//mdc.SetBkColor(m_bkcol);
cf = mdc.SelectObject(&m_font8);
mdc.DrawText(m_strregion2, re, DT_CENTER | DT_SINGLELINE | DT_VCENTER);
cdc.BitBlt(re.left, re.top, re.Width(), re.Height(), &mdc, 0, 0, SRCCOPY);
mdc.SelectObject(obm);
cdc.Detach();
--------------------------------------------------

It works fine. But my problem is how to adjust the size of the text based on the above code?

Thanks in advance!

chen

Re: draw text with text size problem

Roman Fadeyev26-Sep-02 0:54

Roman Fadeyev

26-Sep-02 0:54

GetTextExtentPoint32 ???

AFAIK this function computes the width and height of the specified string of text.

Possibly weird question

Venet26-Sep-02 0:39

Venet

26-Sep-02 0:39

Ok Let's say i have two functions contained in a DLL and an .EXE that calls them.
Then I decide to update this DLL, and add another, third function to it.
Is there any way to make the .EXE aware of this new function without replacing the whole .EXE? Can I get a list of functions dynamically from the DLL and use them form the exe?

Any help or pointers would be really appreciated.

Regards,
Venet.

Donec eris felix, multos numerabis amicos.

Tomasz Sowinski26-Sep-02 0:51

26-Sep-02 0:51

While you can get the exported function table by examining .dll executable file (which uses PE format), you can't answer very important question: what are the parameters and what's the return type.

Even if you could, how could .exe get the advantage of new function - at the moment you write .exe you have no idea what new function will be doing and when should you call it.

Tomasz Sowinski -- http://www.shooltz.com

*** Vodka. Connecting people. ***

Venet26-Sep-02 1:01

Venet

26-Sep-02 1:01

Well I do know the function name and exact parameters. I'm actually writing the .DLL and .EXE.

My Idea was to have some kind of small database in the actual DLL that will keep list of the functions it provides along with the parameters, and maybe .exe will call say GetSupportedFunctions() and will know exactly what functions are there and waht parameters they take. Deciding when to call what function, shouldn't be a problem! However my problem is figuring out, how to call these functions.

Or is this possible at all?

Regards,
Venet.

Donec eris felix, multos numerabis amicos.

Tomasz Sowinski26-Sep-02 1:11

26-Sep-02 1:11

Venet wrote:
However my problem is figuring out, how to call these functions.

Getting the address of function is easy when you have function name (GetProcAddress). But you need to call the function with right parameters, and this would be quite difficult. I guess you'd have to code this part in assembly language.

I still can't see why would you like your .exe to invoke functions unknown when you develop the .exe itself. Enlighten me please Smile | :)

Tomasz Sowinski -- http://www.shooltz.com

*** Vodka. Connecting people. ***

Tomasz Sowinski26-Sep-02 1:25

26-Sep-02 1:25

Well, the .exe will be unable to do the right thing with new functions in .dlls anyway.

I'd split current exe into small .exe program listening for updates and main .dll which contains the core functionality. If new functions appear, .exe unloads the main .dll and replaces it with the updated one which knows what to do with updated plugins.

Tomasz Sowinski -- http://www.shooltz.com

*** Vodka. Connecting people. ***

Venet26-Sep-02 1:25

Venet

26-Sep-02 1:25

Thank you for the suggestion. Smile | :)

Regards,
Venet.

Donec eris felix, multos numerabis amicos.

Jon Hulatt26-Sep-02 2:33

Jon Hulatt

26-Sep-02 2:33

or use plugin style dlls. have the exe scan a particular dir, and attempt to load each dll present, in turn. each dll should have an identical entry point.

Signature space for rent. Apply by email to....

Tomasz Sowinski26-Sep-02 2:41

Funny behaviour by operator new

26-Sep-02 2:41

Yes, but I've got an impression that 'identical entry point' doesn't apply in his project.

Tomasz Sowinski -- http://www.shooltz.com

*** Vodka. Connecting people. ***

Graphs

Kash26-Sep-02 0:37

Kash

26-Sep-02 0:37

I want to display a graph on my property page.
There appears to be many methods for doing this in MFC. e.g. ActiveX, COM, OLE, using existing libraries C++. I'm looking for the least time consuming method.

The simple MS Excel graphing techniques are sufficient for my needs. The data will produce simple non-linear relationships from data stored in CMyProjDoc.

Any ideas?

Kash

Re: Graphs

Stephane Rodriguez.26-Sep-02 1:30

Stephane Rodriguez.

26-Sep-02 1:30

Least time consuming method is ripping method. Get it here[^].

if you start putting in too manay features, it no longer remains useful for beginners
quote in a CP article comment, shiraz baig

Re: Graphs

Kash26-Sep-02 2:15

Kash

26-Sep-02 2:15

I've been doing some research and found I can place an ActiveX control on my property page. This control takes the form of MsChart. How can I link the data to this chart?

Kash

Haakon S.26-Sep-02 0:28

Haakon S.

26-Sep-02 0:28

When I write the following, perfectly ordinary code:

pItem = new CItem;

I get this message:

error C2660: 'new' : function does not take 3 parameters

??? OMG | :OMG:

When I write the same code in another cpp file (for the same CItem) it work's fine. What's going on here?

Regards, Haakon.

Tomasz Sowinski26-Sep-02 0:43

26-Sep-02 0:43

Are you overriding operator new in the file which causes problem?

Tomasz Sowinski -- http://www.shooltz.com

*** Vodka. Connecting people. ***

Roman Fadeyev26-Sep-02 1:05

Roman Fadeyev

26-Sep-02 1:05

May be it is #include <crtdbg.h> or #define DEBUG_NEW or #define _CRTDBG_MAP_ALLOC or something else similar to it. Do you have anything like that? Compare #includes and macros in both files.

Haakon S.26-Sep-02 1:17

Haakon S.

26-Sep-02 1:17

Yes, that's it! Operator new is overridden, and that doesn't go well with DEBUG_NEW. In the file where new works I had the #define new DEBUG_NEW commented out. I remember now. Sorry Blush | :O

I don't understand why, though. But never mind. Problem solved.

Thanks for your help.

Roman Fadeyev26-Sep-02 1:47

Roman Fadeyev

26-Sep-02 1:47

Operator new with 3 params is used only in debug version. 2'nd param is module name, the third - line number. It gives possibility to you to find out memory leaks without any hardships

Compiler Directives

Ruca26-Sep-02 0:29

Ruca

26-Sep-02 0:29

Hi Quick question:
Can one OR (||) compiler directives, such as:
IFDEF ( xxxx || yyyy )
ENDIF

Thanks

Rui

Re: Compiler Directives

Tomasz Sowinski26-Sep-02 0:37