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If you link to a library and if you are using atleast one function that is exported from that library, then of course it goes for the final build. On the other hand, if you are building for "Release" and you have included a library which is absolutely not referred at all, linker warning 4089 will be displayed. And you can choose what to do.
http://vcfaq.mvps.org/ide/7.htm
If your ship doesn't come in, swim out to it. - Jonathan Winters
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I'm not talking about linking against a library in that manner, but rather about the functions included within the library.
Obviously in the case of a dll, the functions will always be there, but what about static libraries. Are all of the functions within the .lib also included within the .exe, I guess so.
What about a library in src form (.h and .cpp), are all those unused functions added to the exe or can they be optimized in some manner?
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waldermort wrote: Are all of the functions within the .lib also included within the .exe
No. All functions are compiled, but unreferenced ones are not linked.
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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unused functions are removed from the final link.
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Could you be a little more clear please 
function from a .lib, src or both?
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The linker includes everything in a section (called a COMDAT) where any member of that section is referenced, if the /OPT:REF switch is specified (which is the default if /DEBUG is not specified). By default the compiler simply generates one COMDAT per source file, but by specifying the /Gy switch, it will instead generate one COMDAT per function. The combination of /Gy and /OPT:REF can be used to eliminate some dead code.
A library is simply a collection of .obj files; the behaviour will depend on whether /Gy was used to build the .obj files in the library. Import libraries are always reduced to the minimum set referenced.
Note that there are techniques which will prevent /OPT:REF from being able to eliminate otherwise unreferenced functions. If you reference a function in a table of function pointers, for example, and the table itself is referenced, all the functions will be included even if those entries in the table are unused. This can apply to MFC message maps and C++ virtual function tables.
Link.exe can tell you what it did include. Generate a map file (with /MAP). This tells you the address at which every function was generated.
It can be confusing for a new developer to find bits of dead code - I've wasted plenty of time trying to work out how to fix code that wasn't actually being called. Since adopting source control, I now delete code that I discover to be dead and which couldn't fulfil any useful purpose if a class was reused. Sometimes you find routines implemented 'for completeness' that actually aren't used in the project which the class was created for. These should be a red flag because it usually means they weren't tested as thoroughly as the rest of the class.
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Thankyou for that excellent explanation.
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Hi all...
I'm trying to code a tool to navigate some web pages.
I start an instance of IE by this code:
CoInitialize(NULL);
HRESULT hr;
IWebBrowser2* pWebBrowser = NULL;
hr = CoCreateInstance (CLSID_InternetExplorer, NULL, CLSCTX_SERVER, IID_IWebBrowser2, (LPVOID*)&pWebBrowser);
And I destroy it with this:
pWebBrowser->Release();
pWebBrowser = NULL;
CoUninitialize ();
Well...this is Ok...but IE window is not closed after Release and CoUninitialize. And so even if I close my program, IE window is still there open! And its process is not killed. How can i close also IE window???
Thanx 
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Just a guess, but you could try the IWebBrowser2::Quit method.
Steve
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ayol12122 wrote:
And I destroy it with this:
pWebBrowser->Release();pWebBrowser = NULL;CoUninitialize ();
This is not destroying web browser. There are other methods.
you can use ,
long hWnd;
pWebBrowser->get_HWND(&hWnd);
SendMessage(hWnd,WM_CLOSE,0,0);
or
pWebBrowser->Quit();
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really really thanx!!
i used quit and everything is ok.
Thanx to both you answered to my question 
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Hi,
I've created an ActiveX control. The Control class (***Ctl) in it should be derived from a class in another dll (which is also created by me). I want to load the ActiveX control dynamically in a container exe and check if the Ctl class is derived from the base class in the dll (This container is also created by me).
The base class in the dll is called TusMacroOcxBase and it is derived from COleControl.
The Ctl class in the ActiveX control which is derived from TusMacroOcxBase is called CTusSampleOcxCtrl.
I decided to make use of CRuntime class's methods to check the class type information (Since COleControl is already derived from CObject). So I proceeded by using the DECLARE_DYNAMIC/DECLARE_DYNCREATE and IMPLEMENT_DYNAMIC/IMPLEMENT_DYNCREATE macros. I also enabled RTTI in the container exe.
My problem is that when I write IMPLEMENT_DYNCREATE(CTusSampleOcxCtrl, TusMacroOcxBase) in CTusSampleOcxCtrl class's .cpp file, it gives error LNK2001.
The error message is given below.
TusSampleOcxCtl.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const TusMacroOcxBase::classTusMacroOcxBase" (?classTusMacroOcxBase@TusMacroOcxBase@@2UCRuntimeClass@@B)
Here is the code snippet:
Base class - .h
class _declspec(dllexport) TusMacroOcxBase : public COleControl
{
public:
DECLARE_DYNAMIC(TusMacroOcxBase)
....
Base class - .cpp
IMPLEMENT_DYNAMIC( TusMacroOcxBase, COleControl )
Derived class - .h
class CTusSampleOcxCtrl : public TusMacroOcxBase
{
DECLARE_DYNCREATE(CTusSampleOcxCtrl)
....
Derived class - .cpp
IMPLEMENT_DYNCREATE(CTusSampleOcxCtrl, TusMacroOcxBase)
I can solve the error easily by replacing IMPLEMENT_DYNCREATE(CTusSampleOcxCtrl, TusMacroOcxBase) with IMPLEMENT_DYNCREATE(CTusSampleOcxCtrl, COleControl), but I cant do that since I need to get the exact base class of CTusSampleOcxCtrl in the container exe. If I give COleControl there, I will get the base class as COleControl only.
Is there any other way? I've tried different combinations of DECLARE_DYNAMIC/DECLARE_DYNCREATE and IMPLEMENT_DYNAMIC/IMPLEMENT_DYNCREATE also.
Any help will be greatly appreciated.
Thanks in advance,
Rems.
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Please check whether you hav added lib path Project|Properties|Linker|Input|Addition
al Dependencies.
Rinu Raj
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Thanks for your response.
I've already added the lib.
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is that lib available in path ? if not please add the path
what about the header file associated is that compatible with the lib ?
Rinu Raj
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Yes.lib is available..Header everything is ok..
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HI ALL,
I have an HTML File. I have to extract all text strings from that html file.
I am using MSHTML.But I dont know where can i find that exact function to get all text strings from a html file.
How can i do this ?
Kindly help me on this issue. Most Urgent !.
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Hope I understood your question
See here[^]
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Dear this is not sufficient.
Can you do more ?
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Give him a day or two and I'm sure he will code a library for you.
You can try parsing the document retrieving text from the HTML tags, for that you will find many examples on CP for parsing a document.
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No ...
I want to take all text strings (each and every line) (not tags) in a html file separatly.
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What exactly do you want?
1. All the text strings, excluding the HTML tags.
2. All the HTML tags, excluding any other string.
3. Everything in the file.
Nobody can give you wiser advice than yourself. - Cicero
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The first one ..
All the text Strings, excluding the HTML tags .
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There are many good articles on CP for that. This article may be of your interest.
http://www.codeproject.com/cpp/krhtmlviewer.asp
"Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
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No. that is not useful thing.
Do you konw any interface that have some function which can do this ? .
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