[fdo-users] Using FDO in a Windows DLL causes unresolved symbol errors

[Greg Boone]

What are your linker settings? Do you link to fdo.lib and fdocommon.lib?

If that is not the issue, try and remove all use of DECLDIR and see if that resolves the linker issue.

-----Original Message-----
From: fdo-users-bounces at lists.osgeo.org [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of nav
Sent: Friday, April 12, 2013 2:45 AM
To: fdo-users at lists.osgeo.org
Subject: [fdo-users] Using FDO in a Windows DLL causes unresolved symbol errors

*I was trying to get the sample FDO code into a DLL, but ran into some unresolved symbol errors and had no way to resolve it. Could you help? Code
below.*

*The error is: *
Error	1	error LNK2019: unresolved external symbol "__declspec(dllimport)
public: static class IProviderRegistry * __cdecl FdoFeatureAccessManager::GetProviderRegistry(void)"
(__imp_?GetProviderRegistry at FdoFeatureAccessManager@@SAPAVIProviderRegistry@@XZ)
referenced in function "public: int __thiscall FDODataConnection::RegisterProvider(void)"
(?RegisterProvider at FDODataConnection@@QAEHXZ)
F:\Projects\DatabasePlugin\DatabasePlugin.obj	DatabasePlugin


*The header:*
#ifndef _DATABASEPLUGIN_H_
#define _DATABASEPLUGIN_H_
#if defined DLL_EXPORT
#define DECLDIR __declspec(dllexport)
#else
#define DECLDIR __declspec(dllimport)
#endif

#include "Fdo\ClientServices\ProviderRegistry.h"
#include "Fdo\ClientServices\ConnectionManager.h"
#include "Fdo\Connections\IConnection.h"			
#include "Fdo\Connections\IConnectionPropertyDictionary.h"
#include "Fdo\Connections\IConnectionInfo.h"
#include "Fdo\ClientServices\FeatureAccessManager.h"
#include <exception>
#include <iostream>
#include <Windows.h>

// Specify "C" linkage to get rid of C++ name mangling extern "C"
{
class FDODataConnection
{
	FdoPtr<FdoProviderRegistry> m_pRegistry;
public:
    FDODataConnection() {}
    ~FDODataConnection() {}
	int RegisterProvider();strPassword,std::string strService,std::string strDataStore); };

FDODataConnection* objConnection;
	
DECLDIR int Connect();
}//extern "C"

#endif // End the inclusion guard

*The cpp:*
#define DLL_EXPORT// DECLDIR will perform an export for us #include "DatabasePlugin.hpp"// Include our header, must come after #define DLL_EXPORT

extern "C" // Get rid of name mangling
{

//==============================================================================
//============================ FDO functions below ============================= //==============================================================================
int FDODataConnection::RegisterProvider()
{
	FdoPtr<FdoProviderRegistry> m_pRegistry = (FdoProviderRegistry*)FdoFeatureAccessManager::GetProviderRegistry();

    return 1;
}//RegisterProvider

    DECLDIR int Connect()
    {
        objConnection = new FDODataConnection();
        int nProviders = objConnection->RegisterProvider();
        return 0;
    }//Connect

}//extern

*I can't keep the FDO include's within extern "C" because the templates in the headers can't be C based.*




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