C / C++ / MFC

yudhisthira wrote:

Hello,
I did clean and build so many times but same error is coming. Is there any other solution pls let me know.

<font size="3">// From DLL A - header:</font>

<font color="Red">#ifdef _BUILDINGDLL
   #define _MY_IMPORTEXPORT __declspec(dllexport);
#else
   #define _MY_IMPORTEXPORT __declspec(dllimport);
#endif</font>

class <font color="Red">_MY_IMPORTEXPORT</font> CLogEntry
{
public:
   ...

   static CLog* GetSingletonLoggingProvider() { return s_pSingletonLoggingProvider; }
   ...

protected:
   ...
   static CLog * s_pSingletonLoggingProvider;
};


<font size="3">// .cpp file:</font>

#include "stdafx.h"

#include "LogEntry.h"

CLog * CLogEntry::s_pSingletonLoggingProvider = NULL; 

CLogEntry::CLogEntry(int nId, nsCLog::eSeverity nSeverity, char* lpszCode, char* lpszMsg, DWORD dwWin32ErrorCode, CLogEntry * pParent)
{
   ...
}
... the rest of it...

Mark Salsbery
Microsoft MVP - Visual C++

<br />
...<br />
class __declspec(dllexport) CLogEntry<br />
{<br />
public:<br />
	...<br />
	static CLog* GetSingletonLoggingProvider() { return s_pSingletonLoggingProvider; }<br />
	<br />
	...<br />
	<br />
protected:<br />
	...<br />
protected:<br />
	...<br />
<br />
	static CLog * s_pSingletonLoggingProvider;<br />
};<br />
<br />
<br />
CLog * CLogEntry::s_pSingletonLoggingProvider = NULL;<br />
#endif<br />

<br />
#ifndef _LOGSINGLETON_<br />
#define _LOGSINGLETON_<br />
CLog * CLogEntry::s_pSingletonLoggingProvider = NULL;<br />

<br />
Linking...<br />
StartupManager.obj : error LNK2005: "protected: static class CLog * CLogEntry::s_pSingletonLoggingProvider" (?s_pSingletonLoggingProvider@CLogEntry@@1PAVCLog@@A) already defined in LogEntry.obj<br />
StartupManager.obj : error LNK2005: "protected: static class CLog * CLogEntry::s_pSingletonLoggingProvider" (?s_pSingletonLoggingProvider@CLogEntry@@1PAVCLog@@A) already defined in LogEntry.obj<br />
StartupManager.obj : warning LNK4006: "protected: static class CLog * CLogEntry::s_pSingletonLoggingProvider" (?s_pSingletonLoggingProvider@CLogEntry@@1PAVCLog@@A) already defined in LogEntry.obj; second definition ignored<br />
   Creating library ..\bin\Utilities.lib and object ..\bin\Utilities.exp<br />
..\bin\Utilities.dll : fatal error LNK1169: one or more multiply defined symbols found<br />
Error executing link.exe.<br />

<br />
#ifdef _BUILDINGDLL<br />
   ...<br />
#else<br />
  ...<br />
#endif<br />

#ifdef UTILITIES_EXPORTS<br />
#define UTILITIES_API __declspec(dllexport)<br />
#else<br />
#define UTILITIES_API __declspec(dllimport)<br />
#endif<br />

devvvy wrote:

Do I need to do this again for individual class?

Mark Salsbery
Microsoft MVP - Visual C++

void main()
{
	int (*p)[3] = new int[2][3];
	int i, j;
	for(i = 0; i < 2; i++) {
		for(j = 0; j < 3; j++) {
			p[i][j] = i +j;
		}
		printf("\n");
	}
	int (*pX)[3] = p;
	for(i = 0; i < 2; i++) {
		for(j = 0; j < 3; j++) {
			printf("%d ", pX[i][j]);
		}
		printf("\n");
	}
	printf("\n");
	for(i = 0; i < 2; i++, pX++) {
		for(j = 0; j < 3; j++) {
			printf("%d ", (*pX)[j]);
		}
		printf("\n");
	}
	delete [] p;
}

<br />
   ON_WM_CTLCOLOR_REFLECT()<br />

<br />
   HBRUSH CMyStatic::CtlColor(CDC *pDC, UINT uiCtlColor)<br />
   {<br />
       pDC->SetTextColor(/* Set color what you want */);<br />
       pDC->SetBkMode(TRANSPARENT);<br />
<br />
       return (HBRUSH) GetStockObject(NULL_BRUSH);<br />
   }<br />