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Hi,
I have created a DLL which has certain shared variables/functions. I have accessed the same DLL in another workspace, when I run the application I am facing the following error. Can anone pls. help me out.
Linking...
AccessRegDLLDlg.obj : error LNK2005: _nVar_Subbu already defined in AccessRegDLL.obj
Debug/AccessRegDLL.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.
The code in the DLL is:
extern "C" {
__declspec(dllexport) int TestDLLFunction();
__declspec(dllexport) int GetValue();
#pragma data_seg("SHARED")
int nVar_Subbu = 1;
#pragma data_seg()
};
Rgds,
Arun.
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Is this code in the header file? Are you including it from more than one .cpp file?
In a header file, mark the variable as extern (without the initialisation), and declare the variable as normal in a .cpp file.
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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Yes, the code declaring variables and functions to be exported is in the header file of the dll.
I have included it using:
#include "..\RegDLLTest\RegDLLTest.h"
but for using a dll as shared i must initiaize the value in the dll to some value o/w the dll itlself will not compile.
Thanks for your response but i still need help.
It's not working.
---Arun.
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The multiply defined error is occurring because you're defining the variable in your header file and including it in two locations. You need to split the declaration as I said:
Header File:
extern int nVar_Subbu; .cpp File
int nVar_Subbu = 1; Only compile this .cpp file in your DLL.
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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try makeing the variable static
static int nVar_Subbu = 1;
nav
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Oh! Thanks Naveen it worked, but can you pls. explain if possible why is static needed.
Rgds,
Arun.
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Hi,
My intention of making the shared dll was that the data or a varibale that is incremented in one exe would reflect in the other. but, making it static the varables have become independent.
Scenario:
I have two exe's accessing the same variable:
i.e "nVar_Subbu" which was initially 1, I have incremented the value of this variable in one exe to 2, when accessed from the other exe it is till showing 1 instead of 2. How to go about this, can anyone help me out pls.
Rgds,
Subbu.
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Why don't u decleare the variable in the CPP file?
nav
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I have used
CProgressCtrl myCtrl;
myCtrl.SendMessage(PBM_SETBARCOLOR,0,RGB(255,0,0));
to change the color of the Progress bar.
But how to change back the color to original.
(If I don't know the color of original)
Please help!
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From the docs:Return Values
Returns the previous progress indicator bar color, or CLR_DEFAULT if the progress indicator bar color is the default color.
--Mike--
Visual C++ MVP 
LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ
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The previous colour is returned by the PBM_SETBARCOLOR message
COLORREF clrPrevious = (COLORREF)myCtrl.SendMessage(PBM_SETBARCOLOR, 0, RGB(255, 0, 0)); Lookup PBM_SETBARCOLOR in MSDN.
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
"Obviously ??? You're definitely a superstar!!!" - mYkel - 21 Jun '04
"There's not enough blatant self-congratulatory backslapping in the world today..." - HumblePie - 21 Jun '05
Within you lies the power for good - Use it!
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Thank you very much!
myCtrl.SendMessage(PBM_SETBARCOLOR, 0, CLR_DEFAULT);
It is alright now!
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Hai
i am trying to explore a project on creating and destroying threads.in that i am not understanding how to create classes which are MFC based i.e code is written by MFC.The following are classes exists in my application.
1)class CAboutDlg : public CDialog
2)class CChildView : public CWnd
3)class CMainFrame : public CFrameWnd
4)class CThreadsApp : public CWinApp
I am not able to understand how to create these classes.
i confused in which type of project to use to explore this application.
please help me .
Thanks in advance
ravishankar
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ravi1217 wrote: ...i am not understanding how to create classes which are MFC based...
Use ClassWizard.
ravi1217 wrote: I am not able to understand how to create these classes.
They already exist. Why would you want to re-create them?
"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli
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To use the class wizard first i need to create a project .
I m in confusion to use which type of project to use.
if i use MFC ApplicationWizard(exe) Single Document class
then i can get these classes as follows.
Document class,viewclass ,MainFrame class and Application class
but where as in my application All classes are MFC based.
and How can then create the following classes using class wizard in my application.
1)class CAboutDlg : public CDialog
2)class CChildView : public CWnd
3)class CMainFrame : public CFrameWnd
4)class CThreadsApp : public CWinApp
ravishankar
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ravi1217 wrote: and How can then create the following classes using class wizard in my application.
1)class CAboutDlg : public CDialog
2)class CChildView : public CWnd
3)class CMainFrame : public CFrameWnd
4)class CThreadsApp : public CWinApp
If you create an SDI application, these classes already exist. You can, however, create other classes derived from CDialog and CWnd using ClassWizard. I'm not sure creating another class from CWinApp would be a good idea since an application only needs/uses one.
"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli
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I have been working on a project (c++) and have noticed that one of the com ports drops out for no reason (as far as I can see). Does anyone have any ideas to why a com port would drop out without an explicit command telling it to?
thanks,
mcb36
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It could be faulty hardware. I've seen COM ports fail before.
Try running your app on a different PC and see if it does any better.
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Recently I use the MFC's Spliter class to split main frame as like such layout ( |- ), left pane and right pane containing top and bottom sub-pane, but I want to fix the left pane size even thought user drags the vertical border between left pane and right pane.Has any body some ideals to perform that? thanks in advance!
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Temp83 wrote: ...but I want to fix the left pane size even thought user drags the vertical border between left pane and right pane.Has any body some ideals to perform that?
See here.
"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli
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Please help me
I have problem communicating bluetooth in visual c++ MFC
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can u detail that!where is the problem which part of teh code?
cheerz!
dont want,dont want thinking,climbing on head and jumping grass!
(venda venda ennu vicharikumbol thellayill keyaree chadunnoda pulle!)
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mahesh_patil166 wrote: I have problem communicating bluetooth in visual c++ MFC
Hi Mahesh,
Please Elobrate your question.. How can we know which class are you using to communicate between bluetooth devices or you have proper hardware for same...
or you have get struck on a particular state!..
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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It appears that when you have a scrollbar in a dialog or property page, the scrollbar steals the WM_MOUSEWHEEL messages. If you have two scrollbars it's worse. One takes most of the messages when the mouse is over the dialog window unless the mouse is hovering over the other scrollbar. Is there any way to intercept or change this?
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hi all,
i m working on an application where i want to create two document and views and want to pass data from one documnt to another.do i need to add childframe,view,document class to the MDI .i m not getting exact idea
sourabh jain
patni computers system
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