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ifstream/ofstream are both creating a file...

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Started by Sand_Hawk October 03, 2002 11:57 AM

5 comments, last by Sand_Hawk 21 years, 6 months ago

Sand_Hawk

108

Author

October 03, 2002 11:57 AM

I am using ofstream/ifstream objects for file access. But when I use this code:


ifstream FromFile("From.cpp");
ofstream ToFile("To.cpp", ios::noreplace);

If From.cpp doesn''t exist it gets created. But I don''t want the file to be created. What am I doing wrong? Sand Hawk ---------------- -Earth is 98% full. Please delete anybody you can.
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----------------(Inspired by Pouya)

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October 03, 2002 12:07 PM

ios::noreplace fails if the file exists..

use ios::nocreate, which will fail if the file doesn''t exist.

:D ~z~ :D

Ronin_54

122

October 03, 2002 12:19 PM

Hehe, he allready heard the anwer in TA... yay to my books

1,658

October 03, 2002 12:31 PM

quote:Original post by Anonymous Poster
ios::noreplace fails if the file exists..
use ios::nocreate, which will fail if the file doesn''t exist.

These flags do not exist in standard C++.

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October 03, 2002 12:35 PM

I thought that, but wasn''t sure. Thanx for the info.

Ronin_54

122

October 03, 2002 12:36 PM

But they work, don''t they? :D

1,658

October 03, 2002 12:51 PM

Not with std::fstream, std::ifstream, nor with std::ofstream, which are the only standard file stream classes, they don't.

std::ifstream ifs( "foo.txt" ) would simply not create the file, but just fail (i.e. ifs.bad() would be true).

Documents [ GDNet | MSDN | STL | OpenGL | Formats | RTFM | Asking Smart Questions ]
C++ Stuff [ MinGW | Loki | SDL | Boost. | STLport | FLTK | ACCU Recommended Books ]

[edited by - Fruny on October 3, 2002 2:01:37 PM]

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

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