解決exe和DLL直接傳遞FILE 指針崩潰的問題

EXE程序和DLL之間可能傳遞FILE指針，但是可能會造成程序崩潰。這是由於_lock_file引起的

void __cdecl _lock_file (
        FILE *pf
        )
{
        /*
         * The way the FILE (pointed to by pf) is locked depends on whether
         * it is part of _iob[] or not
         */
        if ( (pf >= _iob) && (pf <= (&_iob[_IOB_ENTRIES-1])) )
        {
            /*
             * FILE lies in _iob[] so the lock lies in _locktable[].
             */
            _lock( _STREAM_LOCKS + (int)(pf - _iob) );
            /* We set _IOLOCKED to indicate we locked the stream */
            pf->_flag |= _IOLOCKED;
        }
        else
            /*
             * Not part of _iob[]. Therefore, *pf is a _FILEX and the
             * lock field of the struct is an initialized critical
             * section.
             */
            EnterCriticalSection( &(((_FILEX *)pf)->lock) );
}

if ( (pf >= _iob) && (pf <= (&_iob[_IOB_ENTRIES-1])) ) 把fp和一個全局變量_iob比較，exe和DLL可能會有不同的全局變量，這導致fp不在_iob數組的範圍內，導致出現錯誤。

解決的頒發是exe和DLL都動態連接到CRT，或者把DLL編譯成靜態庫。

 

轉自：http://blog.csdn.net/leechiyang/article/details/6873952