EXE程序和DLL之间可能传递FILE指针,但是可能会造成程序崩溃。这是由于_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和一个全局变量_iob比较,exe和DLL可能会有不同的全局变量,这导致fp不在_iob数组的范围内,导致出现错误。
解决的颁发是exe和DLL都动态连接到CRT,或者把DLL编译成静态库。