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POcan't get address of the dll function with GetProcAddress
 

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  1. POcan't get address of the dll function with GetProcAddress
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    <p>I created a dll with VS C++ (of course as a dll project) with the following code of the header file:</p> <pre><code>#pragma once #include &lt;iostream&gt; #include "..\..\profiles/ProfileInterface.h" using namespace std; extern "C" __declspec(dllexport) class CExportCoordinator: public CProfileInterface { public: CExportCoordinator(void); virtual ~CExportCoordinator(void); CProfileInterface* Create(); void Initialize(); void Start(); }; </code></pre> <p>Here is .cpp file of the dll:</p> <pre><code>#include "StdAfx.h" #include "ExportCoordinator.h" CExportCoordinator::CExportCoordinator(void) { } CExportCoordinator::~CExportCoordinator(void) { } CProfileInterface* CExportCoordinator::Create(){ cout &lt;&lt; "ExportCoordinator3 created..." &lt;&lt; endl; return new CExportCoordinator(); } void CExportCoordinator::Initialize(){ cout &lt;&lt; "ExportCoordinator3 initialized..." &lt;&lt; endl; } void CExportCoordinator::Start(){ cout &lt;&lt; "ExportCoordinator3 started..." &lt;&lt; endl; } </code></pre> <p>I exported the whole class <code>CExportCoordinator</code> because I need to use all three methods it offers. Following is the code from the main application loading the, above given, dll on the fly.</p> <pre><code> typedef CProfileInterface* (WINAPI*Create)(); int _tmain(int argc, _TCHAR* argv[]) { HMODULE hLib = LoadLibrary(name); if(hLib==NULL) { cout &lt;&lt; "Unable to load library!" &lt;&lt; endl; return NULL; } char mod[MAXMODULE]; GetModuleFileName(hLib, (LPTSTR)mod, MAXMODULE); cout &lt;&lt; "Library loaded: " &lt;&lt; mod &lt;&lt; endl; Create procAdd = (Create) GetProcAddress(hLib,"Create"); if (!procAdd){ cout &lt;&lt; "function pointer not loaded"; } return; } </code></pre> <p>On the output I get that correct library is loaded, but that function pointer <code>procAdd</code> is NULL. I thought it had something to do with name mangling and added <code>extern "C"</code> when exporting the class in header of dll, but nothing changed. Btw, I used <a href="http://www.nirsoft.net/utils/dll_export_viewer.html" rel="nofollow noreferrer">dll export viewer</a> for viewing the exported functions of the class, and the whole class is exported correctly. Any help?</p> <p><strong>UPDATE</strong><br> there is an error in the header file of dll. I shouldn't be using <code>extern "C" __declspec(dllexport)</code> before class because then class won't be exported at all. If I use <code>class __declspec(dllexport) CExportCoordinator</code> then the class is exported correctly, but anyway I can't get the address of the function other than NULL.</p>
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    1. USdragan.stepanovic
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