cout << EOF

[tomas.srna]

Hello,

Is it possible to send EOF to cout?


I am doing a test program "tester" and I need to send EOF signal, because I am using a pipe: "tester | tested" and "tested" waits for EOF.

However, when I use "cout << EOF", only -1 is sent to cout.


Thanks.

[John E]

This is a total guess. No idea if it'll work but it's got to be worth a try:-

char eof = (char)0x1A;

      cout << eof;

[Twey]

Closing cout (fclose(cout)) will result in EOF being sent to the other end of the pipe.

[tomas.srna]

None helped..

0x1A is not EOF as I know, EOF is -1.

To the second reply: A nice idea, but at first try, compiler said that there are bad conversions, so I tried

fclose((FILE*)(void*)cout);

which sent EOF, but for the price of a segmentation fault afterwards..

Anyway, thanks for trying.

[John E]

Take a look at this Wikipedia article and you'll find that EOF is a system dependent character, commonly (but not always) -1. AFAIK, Windows and DOS use Ctrl-Z to indicate EOF. This is equivalent to the ASCII character SUB (0x1A). You'll find some information about Ctrl-Z here.

[tomas.srna]

I tried it, you are right But only in half.. SUB substitutes EOF in Windows, but not in Unix.. I have just tested it on both platforms.

Anyway, thanks! I didn't know about SUB character. At least it works on Windows.

Edit: Sorry.. You mentioned that it is only in Windows..

[Twey]

Oh, sorry! That was a stupid error. No, cout is of course a stream object, so you should be doing fclose(1) instead (1 being the usual identifier for stdout).