Re: error LNK2005: std::basic_string - C / C++ / MFC Discussion Boards

Nelek26-Jul-07 20:57

26-Jul-07 20:57

I will maybe say something without sense... but... Why don't you make a way of trick to the compiler? I mean...

I make some additions to the SmartList of Simon Hughes here in codeproject. You can look for my article. The fact is...

If a CList can return whatever you give in the TYPE, ARG_TYPE.... Why don't you use that possibility? You can have some intermediate class that use your "typename T" as entry parameter and then you shouldn't have any problem more to return one type or another type of element. The return will depend on what you give to the ARG_TYPE.

I.E:

CMyList < TYPE, ARG_TYPE >& Foo (T tTemp)
{
//do whatever you want with the T parameter tTemp
return tTemp;
}

With that you return T independantly of what type of variable T is, being possible for complex classes too.

In my project I have some main ObjClass that have member variables and methodes that use secondary SubObjClass that have parameters and methodes that use third type of SubSubObjClass, so on till 5 steps in the hierarchy. And The main objects are saved in one of this list. The list can save different type of things and returns what it has saved in. No matter of what.

Im not meaning you should a CList with your elements, but maybe you can rewrite your template to return whatever you need using something like that.

I hope not saying silly things and that it helps you Wink | ;)

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: Template specialization

Russell^'29-Jul-07 22:09

Russell^'

29-Jul-07 22:09

Nelek wrote:
I will maybe say something without sense

No!! Why?

Interesting idea, Smile | :)

Thank You.

Russell

Closing MainFrame window

Anu_Bala25-Jul-07 23:38

Anu_Bala

25-Jul-07 23:38

Hi,
My mainframe window has close,mini amd maxi buttons.
But it does not work.
I cannot close or minimize the window.
Whats the reason.
My Precreatewindow codes like

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
cs.style = WS_POPUP | WS_OVERLAPPED | WS_CAPTION | FWS_ADDTOTITLE
| WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_MAXIMIZE;

return CMDIFrameWnd::PreCreateWindow(cs);
}
Whats the reason?

Anu

Re: Closing MainFrame window

Roger Broomfield26-Jul-07 0:09

Roger Broomfield

26-Jul-07 0:09

I keep wonderring why you totally replace the cs.style value, convention is you should OR the desired extra styles with the passed in cs.style value. It is also unconventional to have a popup overlapped window, refer to MSDN CWnd::CreateEx Remarks section where it states "Creates an overlapped, pop-up, or child-window ...".

Re: Closing MainFrame window

Mark Salsbery26-Jul-07 5:40

Mark Salsbery

26-Jul-07 5:40

In addition to Roger's reply...

How do you know calling CMDIFrameWnd::PreCreateWindow() AFTER setting your values to cs won't completely overwrite yours?

You should call the base class first and THEN modify the appropriate values.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Closing MainFrame window

Nelek26-Jul-07 21:04

Nelek

26-Jul-07 21:04

I modify my MainView style as follows:

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{	if( !CMDIFrameWnd::PreCreateWindow(cs) )
		return FALSE;

	cs.style = cs.style | WS_MAXIMIZE;

	return TRUE;
}

and it works fine.

Hope it helps

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

error LNK2005: std::basic_string

Mohammed Asif Palimar25-Jul-07 23:23

Mohammed Asif Palimar

25-Jul-07 23:23

Hi,

I have MFC code written on VC6 platform.Now im trying to build the same code in VS2005 platform.Im getting following linking error.

Error 1 error LNK2005: "public: char const * __thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::c_str(void)const " (?c_str@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QBEPBDXZ) already defined in MyCtrl.obj MY_FileIO.lib

Where MyCtrl.cpp is in the application project and MY_FileIO is a project for DLL used by application.

Whats the cause and whats the solution for the same?

Re: error LNK2005: std::basic_string

mandanani25-Jul-07 23:30

mandanani

25-Jul-07 23:30

Probably you are trying to use both iostram library and std library.
Your dll and application should use same type of libraries.
If your dll uses MFC then modify the project setting accordingly.
I have not used VS 2005, but here is the way to set application use MFC in VS 6.0
Project > Settings > General tab. "Select Use MFC in Shared Dll"

Re: error LNK2005: std::basic_string

Cedric Moonen25-Jul-07 23:39

Cedric Moonen

25-Jul-07 23:39

Verify that both your dll and axecutable use the same run-time library. For that, open the project properties -> "C/C++" and verify that "Runtime Library" is the same for both projects.

Cédric Moonen
Software developer

Charting control [v1.2]

Re: error LNK2005: std::basic_string

Mohammed Asif Palimar25-Jul-07 23:48

Mohammed Asif Palimar

25-Jul-07 23:48

My Application and DLL has "Multi-threaded Debug (/MTd)" setting set in RunTime library.Still it has the linking error. Frown | :(

Re: error LNK2005: std::basic_string

Russell^'26-Jul-07 0:13

Russell^'

26-Jul-07 0:13

is
#include "stdafx.h"
writed on the top of that file ?

Russell

Re: error LNK2005: std::basic_string

Russell^'26-Jul-07 0:46

Russell^'

26-Jul-07 0:46

and / or
#pragma once
?

Russell

Re: error LNK2005: std::basic_string

Mohammed Asif Palimar26-Jul-07 0:54

Mohammed Asif Palimar

26-Jul-07 0:54

Even it had #pragma once statement in the corresponding .h file.

Re: error LNK2005: std::basic_string

Mohammed Asif Palimar26-Jul-07 0:50

Mohammed Asif Palimar

26-Jul-07 0:50

Yes.
#include "stdafx.h" statement is included in the .cpp file.
I tried setting "configuration Property->General->use of MFC" to "Use MFC in shared DLL ".It gave me many more linking errors (like RegSetValueEx is not defined.)

i red this link http://support.microsoft.com/kb/148652.Even this didnt helped me much.

HANDLE and FILE*

George_George25-Jul-07 23:20

George_George

25-Jul-07 23:20

Hello everyone,

I am using Windows API open (create) a new file by CreateFile,

http://msdn2.microsoft.com/en-us/library/aa363858.aspx

the return value is HANDLE, if I use fwrite to write content to the file, since fwrite requires FILE* as parameter. I think HANDLE is not the same as FILE*, right?

Are there any ways (or methods) to transform HANDLE to FILE*?

I have tried that passing HANDLE directly to fwrite (forcely convert from HANDLE from FILE*) will cause access violation exception. I think the reason is HANDLE is not the same as FILE*, is that correct?

thanks in advance,
George

Re: HANDLE and FILE*

Jonathan [Darka]25-Jul-07 23:30

Jonathan [Darka]

25-Jul-07 23:30

You should be using WriteFile() with CreateFile().

Jonathan Wilkes
Darka[Xanya.net]

or...

CPallini25-Jul-07 23:43

CPallini

25-Jul-07 23:43

As already suggested by Jonathan Wilkes: "you should be using WriteFile() with CreateFile()".
Alternatively you can use fopen to open the file and then fwrite to write into the file itsef. Bottom line: be consistent.
Smile | :)

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.

Re: HANDLE and FILE*

Viorel.26-Jul-07 2:07

Viorel.

26-Jul-07 2:07

It seems easier to convert from FILE * to HANDLE:

#include <io.h>
#include <fcntl.h>

FILE * f = . . .;
HANDLE h = (HANDLE)_get_osfhandle(fileno(f));

The other conversion looks longer:

HANDLE h = . . .
FILE * f = _fdopen(_open_osfhandle((intptr_t)h, _O_RDONLY), "rb");

I hope this works. I am not sure mixing of operations with FILE * and HANDLE cannot be avoided.

Re: HANDLE and FILE*

CPallini26-Jul-07 2:29

CPallini

26-Jul-07 2:29

Viorel. wrote:
I hope this works. I am not sure mixing of operations with FILE * and HANDLE cannot be avoided

In fact the mix can usually be avoided (and should be avoided, at least to maintain the code coherence). There are, of course, exceptions...

Smile | :)

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.

Pre-Requisite

Mahesh Kulkarni25-Jul-07 23:12

Mahesh Kulkarni

25-Jul-07 23:12

Hi Friends ...
I have to install the dll build in VS2005 ? It is giving error to install that dll? I installed Framework2.0 on the same machine still there is problem exists.
I have also copied mfc71.dll in sytem32 folder?
What should I do to register my dll?
Please help me ...
Thanking You...

The secret of life is not enjoyment
but education through experience.
- Swami Vivekananda.

Re: Pre-Requisite

Mark Salsbery26-Jul-07 5:57

Mark Salsbery

26-Jul-07 5:57

Just copying DLLs to arbitrary locations is going to cause problems, especially with VS 2005.

See Deployment (C++)[^] and/or Redistributing Visual C++ Files[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Pre-Requisite

Mahesh Kulkarni27-Jul-07 2:05

Mahesh Kulkarni

27-Jul-07 2:05

Thanks Mark.
But still the problem exists there.
I am still not able to register DLL.

Installed patch required for the same.
I also tried the INstallers way...but not getting the result.

I dont know wht i am missing please help me.

The secret of life is not enjoyment
but education through experience.
- Swami Vivekananda.

Re: Pre-Requisite

Mark Salsbery27-Jul-07 5:06

Mark Salsbery

27-Jul-07 5:06

When the error occurs:

1) What exactly are you doing (or trying to do)?
2) What is the exact error message?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

How to restore the bitmap used by CImageList::Add

Nishad S25-Jul-07 22:30

Nishad S

25-Jul-07 22:30

Hi,

I am using the CImageList::Add(CBitmap* pbmImage,COLORREF crMask) to add a bitmap to the ImageList. The problem is that, this API will change the background color in the supplied bitmap to black. But as per my requirenment it should not be happened since I have to use the bitmap again.

So how can I retain the bitmap?

Thanks in advance.

- NS -

Re: How to restore the bitmap used by CImageList::Add

#realJSOP26-Jul-07 2:15

#realJSOP

26-Jul-07 2:15

You didn't correctly initialize your image list.

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