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PODynamic Linking C++ DLL ... What am I doing wrong?
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  1. PODynamic Linking C++ DLL ... What am I doing wrong?
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    copied!<p>I've been trying to create a DLL and link the DLL to my program but every time I try my program can't find the function. The DLL loads fine but the function cant be found.</p> <p>Program:</p> <pre><code>#include &lt;iostream&gt; #include &lt;windows.h&gt; using namespace std; typedef void (*HelloPtr)(); int main() { HelloPtr hello; HINSTANCE hDll = LoadLibrary("dll.dll"); if(hDll) { hello = (HelloPtr)GetProcAddress(hDll, "hello"); if(hello) { hello(); } else { // Error code here } } return 0; } </code></pre> <p>dllmain.cpp</p> <pre><code>#include "dll.h" #include &lt;windows.h&gt; DLLIMPORT void hello() { MessageBox(NULL, "Hey", "", MB_OK); } DllClass::DllClass() { } DllClass::~DllClass () { } BOOL APIENTRY DllMain (HINSTANCE hInst /* Library instance handle. */ , DWORD reason /* Reason this function is being called. */ , LPVOID reserved /* Not used. */ ) { switch (reason) { case DLL_PROCESS_ATTACH: break; case DLL_PROCESS_DETACH: break; case DLL_THREAD_ATTACH: break; case DLL_THREAD_DETACH: break; } /* Returns TRUE on success, FALSE on failure */ return TRUE; } </code></pre> <p>dll.h</p> <pre><code>#ifndef _DLL_H_ #define _DLL_H_ #if BUILDING_DLL # define DLLIMPORT __declspec (dllexport) void hello(void) #else /* Not BUILDING_DLL */ # define DLLIMPORT __declspec (dllexport) void hello(void) #endif /* Not BUILDING_DLL */ class DLLIMPORT DllClass { public: DllClass(); virtual ~DllClass(void); // Says hello world DLLImport void hello(void); private: }; #endif /* _DLL_H_ */ </code></pre> <p>I'd like to know what I'm doing wrong so I can document it and learn.</p> <p>Thanks</p>
 

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