一个关于文件句柄的问题

DQP

说错了　改一下　．．
PACKAGE:ATA 句柄指向的是在PACKAGE中　__DATA__ 之后的内容.　默认PACKAGE 是ｍａｉｎ
例如:

1. 
   
2. while(<DATA>){
   
3.   print;
   
4. }
   
5. __DATA__
   
6. a b c
   
7. 1 2 3
   

复制代码

输出
a b c
1 2 3

<>和<ARGV>是一样的

ARGVOUT没用过 我去查查

[ 本帖最后由 DQP 于 2009-5-21 17:39 编辑 ]

DQP

具体内用可以在 perldoc perlvar中查到 我把原文贴上来

ARGVOUT
The special filehandle that points to the currently open output file when doing edit-in-place processing with -i. Useful when you have to do a lot of inserting and don't want to keep modifying $_. See perlrun for the -i switch.

DQP

额。。。 刚才说错了。  
我就不胡说了 我把原文贴上来。 END 和 DATA的区别在这段中有解释

Text after __DATA__ but may be read via the filehandle PACKNAME:ATA , where PACKNAME is the package that was current when the __DATA__ token was encountered. The filehandle is left open pointing to the contents after __DATA__. It is the program's responsibility to close DATA when it is done reading from it. For compatibility with older scripts written before __DATA__ was introduced, __END__ behaves like __DATA__ in the top level script (but not in files loaded with require or do) and leaves the remaining contents of the file accessible via main:ATA .

MMMIX

原帖由 ILoveMK 于 2009-5-21 17:44 发表
不好意思，偶的e文很烂，完全看不懂，

知道自己英文烂就要利用一切机会练习

DQP

<END>  在最上层的程序中相当于　<main::DATA>
在下面２个例子中的DATA都是不能被END替换的

1. 
   
2. file1 : Foo.pm
   
3. 
   
4. __DATA__
   
5. 1 2 3
   
6. 
   
7. t.pl
   
8. use Foo;
   
9. while(<DATA>){print}
   

复制代码

1. 
   
2. package foo;
   
3. while(<DATA>){
   
4. .......
   
5. }
   
6. __DATA__
   
7. 1 2 3
   

复制代码

[ 本帖最后由 DQP 于 2009-5-21 17:59 编辑 ]

yashiro_lj

__END__ behaves like __DATA__ in the top level script (but not in files loaded with require or do) and leaves the remaining contents of the file accessible via main:ATA .

这里top level script的意思就是main吗？


看了楼上的示例，确认了，呵呵~~

[ 本帖最后由 yashiro_lj 于 2009-5-21 17:58 编辑 ]

MMMIX

原帖由 yashiro_lj 于 2009-5-21 17:57 发表


这里top level script的意思就是main吗？

Perl 根本没有 main 的概念。