C / C++ / MFC

Re: Copy constructor problem

9-Mar-08 5:58

Exploit polymorphism: implement a virtual member, say clone(basically a copy-constructor), for both Base and Derived class and use it to copy list members.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Rajkumar R9-Mar-08 20:26

Rajkumar R

9-Mar-08 20:26

followait wrote:
Add a virtual function like clone()?

I guess you modified to add the above, and you want some other method to call the copy constructor.

I assume, if m_list contains Base and derived pointers means your list holds a single type may be "Base *. I assume your base class destructor is virtual destructor other wise you end up not calling derived class destructor if it is derived object and pointer is base.

If you have any virtual function, possibly atleast virtual destructor, then you can use the runtime type information to call the copy constructor,

Base *pObj = new Derived();
 Base *pObjClone = NULL;

 const type_info& typeInfo = typeid(*pObj);
 if (typeid(Derived) == typeInfo)
 {
     pObjClone  = new Derived(( Derived & )*pObj);
 }
 else if (typeid(Base) == typeInfo)
 {
     pObjClone  = new Base(( Base & )*pObj);
 }
 /*else if (typeid(...) == typeInfo)
 {
 }*/
 else
 {
     // invalid type
 }

Note: if you don't have virtual destructor, deleting the list item may have memory leak.

this method can be used if your class have any virtual function and you don't want to change the code to add clone() method.

if you don't have virtual functions and don't want to add clone method, may be storing type (enumerated values) along with the pointer in the list, or separte list for each type can be used.

if you are free to add virtual functions, Clone() method will be the right choice.

Standalone EXE

ddspliting9-Mar-08 4:21

ddspliting

9-Mar-08 4:21

How to make a standalone EXE(with all libraries included) file in Visual Studio 1998!
In Visual Studio 2005, there is an option but I can't find one in Visual Studio 1998!
Please help me out! Frown | :(

Oh, they made it again!

CPallini9-Mar-08 5:50

9-Mar-08 5:50

ddspliting wrote:
Visual Studio 1998

Another custom version of Visual Studio!
Big Grin | :-D

followait9-Mar-08 5:51

followait

9-Mar-08 5:51

Project/Setting/General/Microsoft Foundation Classes: Use MFC in a Static Library

ddspliting9-Mar-08 10:12

ddspliting

9-Mar-08 10:12

Its not working in Visual Studio 6(1998).It has only option of USE MFC in share DLL! and not static DLL unlike Visual Studio 2005!
Please if there is any other way???

CPallini9-Mar-08 11:18

9-Mar-08 11:18

You're wrong: Visual Studio 6 allows to link statically with MFC.
Smile | :)

followait9-Mar-08 15:49

followait

9-Mar-08 15:49

check option for the compiler? cl.exe

Re: Unexpected linker fault

ddspliting14-Mar-08 4:12

ddspliting

14-Mar-08 4:12

and where is tht compiler options?

Unexpected linker fault

Anthony Appleyard9-Mar-08 3:14

Anthony Appleyard

9-Mar-08 3:14

I have a program which I adapted from Borland C++ to Visual C++ and got compiling correctly in Debug mode.

On changing to Release mode its linker moaned thus. On going back to Debug mode it compiled and linked successfully. What happened?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1>IMAGES.CPP
1>Compiling resources...
1>Microsoft (R) Windows (R) Resource Compiler Version 6.0.5724.0
1>Copyright (C) Microsoft Corporation. All rights reserved.
1>Linking...
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipGetImageEncodersSize@8
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipGetImageEncoders@12
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdiplusStartup@12
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipCreateBitmapFromFile@8
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipCreateBitmapFromFileICM@8
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipFree@4
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipAlloc@4
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipCloneImage@8
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipDisposeImage@4
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipCreateHBITMAPFromBitmap@12
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipGetImageWidth@8
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipGetImageHeight@8
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdiplusShutdown@4
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipCreateBitmapFromGdiDib@12
1>IMAGES.obj : error LNK2001: unresolved external symbol _EncoderQuality
1>IMAGES.obj : error LNK2001: unresolved external symbol _GdipSaveImageToFile@16
1>C:\2d\ppp_vc\Release\ppp_vc.exe : fatal error LNK1120: 16 unresolved externals
1>Build log was saved at "file://c:\2d\ppp_vc\ppp_vc\Release\BuildLog.htm"
1>ppp_vc - 17 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

Rajkumar R9-Mar-08 3:38

Rajkumar R

9-Mar-08 3:38

I think Gdiplus.lib is included to the project settings for debug configuration and not for release configuration. add to release config also,

or add to the common header the following, stdafx.h if using precompiled header.
#pragma comment (lib, "Gdiplus.lib")

Re: Unexpected linker fault

CPallini9-Mar-08 3:41

unqualified name in template

9-Mar-08 3:41

Probably project properties for Debug build contain correctly gdiplus.lib as additional library to link, while for Release build it don't.
Smile | :)

George_George9-Mar-08 3:07

George_George

9-Mar-08 3:07

Hello everyone,

About Bjarne's statement in section C.13.8.3 Point of Instantiation Binding, I have made some further thinking and coding. Here are my two questions.

--------------------
Nor can an unqualified name used in a template ever be bound to a local name.
--------------------

1. Sometimes we use qualified name in template? I have never usage of qualified names in template. Does Bjarne means some code like this, Does such use rare?

(suppose Foo is a template class)

Foo<::myType> or Foo<Somenamespace::myType> or Foo<SomeClass::myType>

2,

Does Bjarne indicate qualified names used in a template coule be bound to a local name? For example, we define a local namespace, put a struct in the local namespace, then we could use localNameSpace::strctInLocalNameSpace to instantise the template?

Puesdu code like this.

void f()
{
// inside local function f
namespace localns {
    struct foo;
};
vector<localns::foo> vc;
}

thanks in advance,
George

Detailed .map file

ForNow9-Mar-08 2:54

ForNow

9-Mar-08 2:54

Is there a way to get a detailed .map file

I have a large structure which is exported in the structure

I have some arrays of structures of which I don't think is the length I am expecting due to a storage overlay durning exection

The number of elements in the structure array is defined with a #defined varaible

e.g.
#define num 30

typedef
struct
{

} A;

A b[num];

due to storage overlay durning exection I dont think b is the length I excpect it to be

Thankx

Record the number of command clicks on the main GUI

Golden Lee9-Mar-08 1:47

Golden Lee

9-Mar-08 1:47

Hi,
I'm trying to record user operations (i.e. mouse clicks and/or keystrokes) to certain commands such as Open, Save, Play, Render, and so on. For example, I can use std:map<std::string sCommandID, int iVisit> to count up mouse clicks and/or keystrokes because I want to maintain a commands visiting history list (ordered from the most cliked command to the least clicked one) for each current login user to my application. When the user login to the application, the a commands visiting history list will be presented as an easy reach position on the screen. Worthy of mention is that I want to record the user operations occurred only on main GUI, for example buttons on the toobar, status bar, task pane, main menu bar, and etc. Unlike the screen capture programs (for example, Northon Screen Cam), I don't want to capture the mouse movement, and save the on-screen pictures dynamically at a certain frame rate.

What Microsoft development library or API functions shall I use? Could you give me some programming tips concerned?
Thank you.

GoldenLee

Re: Record the number of command clicks on the main GUI

Rajkumar R9-Mar-08 3:08

Rajkumar R

9-Mar-08 3:08

Golden Lee wrote:
I want to maintain a commands visiting history list (ordered from the most cliked command to the least clicked one) for each current login user to my application

since it is your application, you can add the values to map at each message handler of the commands.

see here [^] if you want to get the user login info for the application.

DLL Plugins

Ivan-bg9-Mar-08 1:18

Ivan-bg

9-Mar-08 1:18

Hello everybody!

I've got a problem that's been bugging me for some time.

There are a certain number of functions that need to be transformed into dll-s. I've read pretty much all the articles about that on codeproject and that's fine, but I'm still not really confident with windows programming.

You see, every function has to be in its own dll and I have to make a dll-plugin manager. The main thing is that the functions can take a different number and type of arguments - (ex. f1(string s, string s2, string s3), f2(string s, double d)...)

The first argument (string s), and the return value are common for all functions. Is it possible, for example, to have only that one argument (thus achieving uniformity), and take the rest through some kind of message boxes in the function itself? Or is there a better way?

Thank you in advance!

CPallini9-Mar-08 3:48

9-Mar-08 3:48

Ivan-bg wrote:
ou see, every function has to be in its own dll

One DLL for one function? It seems against the very nature of the DLL, that is a dynamic library of functions.

Ivan-bg wrote:
The first argument (string s), and the return value are common for all functions. Is it possible, for example, to have only that one argument (thus achieving uniformity), and take the rest through some kind of message boxes in the function itself? Or is there a better way?

You can always pass just a pointer to a struct.

Ivan-bg9-Mar-08 4:50

Ivan-bg

9-Mar-08 4:50

I wasn't precise enough. I was talking about the main class of functions, that have to be separated. Each dll will contain 4 more functions that are of the same type.

I would pass a pointer to a struct, but the point is that the program is supposed to be extendable - anyone could add another algorithm (main function), which takes a string and a certain number of parameters of different types. That's why I can't make any assumptions about the number and type of parameters, or struct members.

Any ideas?

CPallini9-Mar-08 5:46

9-Mar-08 5:46

Ivan-bg wrote:
Any ideas?

Yes, pass an array of VARIANTs.
Smile | :)

image processing toolkits | batch image processing

C^hris L^osinger9-Mar-08 15:46

C^hris L^osinger

9-Mar-08 15:46

pass everything as XML

Open Excel file,Error

TaoteSea8-Mar-08 23:21

TaoteSea

8-Mar-08 23:21

Open Excel file,Error

_ConnectionPtr m_adoConn;
_RecordsetPtr m_adoRec;
::CoInitialize(NULL);
m_adoConn.CreateInstance(__uuidof(Connection));
m_adoConn->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\1.xls;Extended Properties=Excel 8.0;IMEX=1;","","",adModeUnknown);

stop this function:
inline HRESULT Connection15::Open ( _bstr_t ConnectionString, _bstr_t UserID, _bstr_t Password, long Options ) {
HRESULT _hr = raw_Open(ConnectionString, UserID, Password, Options);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
return _hr;
}

why error
thank Smile | :)

Blog:
http://taotesea.spaces.live.com

Re: Open Excel file,Error

CPallini8-Mar-08 23:34