动态调用win32 dll

最新推荐文章于 2024-03-03 13:37:09 发布

原创最新推荐文章于 2024-03-03 13:37:09 发布 · 662 阅读

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#dll #initialization #mfc #application #behavior #null

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本文介绍了一个C++程序如何加载动态链接库并从中获取函数指针的过程。该程序通过使用Windows API函数LoadLibrary和GetProcAddress来实现动态链接库(PictureFactoryPlugin.dll)的加载，并调用了其中的GetDataByHeight、GetDataByLevel及addtest三个函数。

typedef int (*getradardata)(const char *, float fHeight, char *, const char *);
typedef int (*getradardataLevel)(const char *, int iLevel, char *, const char *);
typedef int (*add)(int,int);

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
   int nRetCode = 0;

   // initialize MFC and print and error on failure
   if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
   {
       // TODO: change error code to suit your needs
       _tprintf(_T("Fatal Error: MFC initialization failed\n"));
       nRetCode = 1;
   }
   else
   {
       // TODO: code your application's behavior here.
       //Factory * pFactory = new ConcreteFactory();
       //pFactory->CreateProduct();

       //delete pFactory;

       {

           HMODULE hdll = LoadLibrary(_T("PictureFactoryPlugin.dll"));

           getradardata func = (getradardata)GetProcAddress(hdll, "GetDataByHeight");
           getradardataLevel funcLevel = (getradardataLevel)GetProcAddress(hdll, "GetDataByLevel");
           add funcAdd = (add)GetProcAddress(hdll, "addtest");

           char data[460*460*4];
            func("CAP.bin.bz2", 5.0, data, 0);
            int i = funcAdd(2, 4);
           return 0;
       }

   }

   system("PAUSE");
   return nRetCode;
}