动态加载dll的方法

定义函数指针

typedef int (WINAPI * GetDllFun)(WCHAR * wszPDFName, WCHAR * wszOutFileName, int * pPageCount);

extern HMODULE g_hMoudleViewer;

extern GetDllFun g_GetFirstPageViewer;

加载函数

AddDllFun(const CString & strFileName, const CString & strOutFileName
  , int & nPageCount)

{

 if(g_GetFirstPageViewer == NULL)

{

g_hMoudleViewer = ::LoadLibrary(_T("PDFViewer.dll"));
if(g_hMoudleViewer != NULL)

{

g_GetFirstPageViewer = (GetDllFun)GetProcAddress(g_hMoudleViewer, "GetFirstPage");

if(g_GetFirstPageViewer != NULL)

{

int nResult = g_GetFirstPageViewer((WCHAR*)(LPCTSTR)strFileName
     , (WCHAR*)(LPCTSTR)strOutFileName , &nPageCount);

}

}

}

}

 

用过之后要记得释放

g_GetFirstPageViewer = NULL;

if(g_hMoudleViewer != NULL)

{

::FreeLibrary(g_hMoudleViewer);

g_hMoudleViewer = NULL;

}