1. VS2003为啥能够attach一个进程就可以bebug,代码如何和dll联系起来的？
答：在编译代码之后，就会生成pdb文件，这个文件中记录了dll和代码之间的映射。
2. 在makefile.dcl中能够看到DllName = ${ClientAppOLAddInDLL}${DllExt}
其中${ClientAppOLAddInDLL}是定义在别处的，查找方法：
VS2003 ctrl+Shift+F
弹出对话框在Look in 中点击带三个小点的浏览文件的对话框。选中要查找的目录。能够找到
ClientAppOLAddInDLL = sieboladdin
好强大啊。
3．全局errno方式：就是在出现错误的时候，将错误代码记录到一个全局变量errno中。比如waitpid()函数在被信号中断的情况下，将errno设置为EINTR（一
宏定义常量）。这种方式解决了返回值方式遇到的返回值冲突问题，而且效率方面也是非常令人愉悦的。但是它要求用户在调用函数后检查errno的值，这种
保证是脆弱的，程序仍然有可能在不处理那些errno的情况下”安然”地运行，导致未定义的结果。另一个问题出在多线程方面，errno不是线程安全的，多个
线程操作同一个errno会造成混乱。
4. 先在硬盘上用写的方式打开一个.txt文件，关闭文件后将该文件从硬盘上删除，这个操作该怎样用程序来实现？
_unlink, _wunlink
Delete a file.
int _unlink( const char *filename );
int _wunlink( const wchar_t *filename );
Routine Required Header Compatibility
_unlink and Win 95, Win NT
_wunlink or Win NT
For additional compatibility information, see Compatibility in the Introduction.
Libraries
LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version
Return Value
Each of these functions returns 0 if successful. Otherwise, the function returns –1 and sets errno to EACCES, which means the path specifies a read-only file, or to ENOENT, which means the file or path is not found or the path specified a directory.
Parameter
filename
Name of file to remove
Remarks
The _unlink function deletes the file specified by filename. _wunlink is a wide-character version of _unlink; the filename argument to _wunlink is a wide-character string. These functions behave identically otherwise.
Generic-Text Routine Mappings
TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_tunlink _unlink _unlink _wunlink
Example
/* UNLINK.C: This program uses _unlink to delete UNLINK.OBJ. */
#include
void main( void )
{
if( _unlink( "unlink.obj" ) == -1 )
perror( "Could not delete 'UNLINK.OBJ'" );
else
printf( "Deleted 'UNLINK.OBJ'\n" );
}
Output
Deleted 'UNLINK.OBJ'
File Handling Routines
See Also _close, remove
remove, _wremove
Delete a file.
int remove( const char *path );
int _wremove( const wchar_t *path );
Routine Required Header Compatibility
remove or ANSI, Win 95, Win NT
_wremove or Win NT
For additional compatibility information, see Compatibility in the Introduction.
Libraries
LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version
Return Value
Each of these functions returns 0 if the file is successfully deleted. Otherwise, it returns –1 and sets errno either to EACCES to indicate that the path specifies a read-only file, or to ENOENT to indicate that the filename or path was not found or that the path specifies a directory. This function fails and returns -1 if the file is open.
Parameter
path
Path of file to be removed
Remarks
The remove function deletes the file specified by path. _wremove is a wide-character version of _remove; the path argument to _wremove is a wide-character string. _wremove and _remove behave identically otherwise. All handles to a file must be closed before it can be deleted.
Generic-Text Routine Mappings
TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_tremove remove remove _wremove
Example
/* REMOVE.C: This program uses remove to delete REMOVE.OBJ. */
#include
void main( void )
{
if( remove( "remove.obj" ) == -1 )
perror( "Could not delete 'REMOVE.OBJ'" );
else
printf( "Deleted 'REMOVE.OBJ'\n" );
}
Output
Deleted 'REMOVE.OBJ'
File Handling Routines
See Also _unlink
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