C / C++ / MFC

HANDLE hCreateFile = CreateFile(  _T("E:\\size0.txt"), // file name with path <br />
                                       GENERIC_READ | GENERIC_WRITE, // Access mode<br />
                                       FILE_SHARE_READ, // Sharing mode<br />
                                       NULL,            // Security Attributes     <br />
                                       OPEN_ALWAYS ,  //   How to create<br />
                                       FILE_ATTRIBUTE_NORMAL, // File attributes<br />
                                       NULL                 // Handle to template file<br />
                                       );<br />
               <br />
        if( INVALID_HANDLE_VALUE == hCreateFile )<br />
        { err handling       }<br />
        // 2. Create a FILE mapping object<br />
        HANDLE hFileMap = CreateFileMapping( hCreateFile, // handle to the opened file <br />
                                             NULL,        // security attributes <br />
                                             PAGE_READWRITE, // protection<br />
                                             0,              // high-order DWORD of size<br />
                                             0,             // low-order DWORD of size<br />
                                             NULL           // mapping object name<br />
                                             );<br />
        <br />
        if( NULL == hFileMap ) // this return NULL when file size is 0.<br />
        { errHandling() }