system command

[Eliseo]

in a system command when you want to do something with directories you
are forced to type \\ unstid of just one (ex. system("md
c:\\newdir");) is there any way I can avoid this, I am making a VB
program that interacts with this C++ program and needs to have those
off. Thank alot. Please email me an answer if possible
(eliseogonzalez @hotmail.com).

[Victor Bazarov]

Re: system command

"Eliseo" <eliseogonzalez @hotmail.com> wrote...[color=blue]
> in a system command when you want to do something with directories you
> are forced to type \\ unstid of just one (ex. system("md
> c:\\newdir");) is there any way I can avoid this, I am making a VB
> program that interacts with this C++ program and needs to have those
> off. Thank alot.[/color]

What's the problem you're experiencing? The doubling of the backslash
is only necessary in C++ _source_code_ so that the compiler converts
them into a _single_ backslash. You can confirm that by looking at
the resulting executable using any hex editor. The "md c: ..." string
will have only single backslashes in it.
[color=blue]
> Please email me an answer if possible
> (eliseogonzalez @hotmail.com).[/color]

Not possible.

Victor

[Mike Wahler]

Re: system command

Eliseo <eliseogonzalez @hotmail.com> wrote in message
news:ab04fba6.0 309150917.391e0 8dc@posting.goo gle.com...[color=blue]
> in a system command[/color]

Note that C++ has no 'commands'. 'system()' is a
standard library function.
[color=blue]
> when you want to do something with directories[/color]

The syntax you're asking about has nothing to do with
directories, but with 'escaped' characters, i.e. those
which cannot be directly expressed in a source code with
a single character. E.g. a newline character is expressed
as '\n', a tab character as '\t', etc. Since the backslash
('\') character is being used for this 'escape' character,
we need a way to express the backslash character itself.
This is done with the 'escape' character (the backslash),
followed by another backslash.

[color=blue]
> you
> are forced to type \\ unstid of just one[/color]

Only in your source code.
[color=blue]
> (ex. system("md
> c:\\newdir");) is there any way I can avoid this, I am making a VB
> program that interacts with this C++ program and needs to have those
> off.[/color]

They're already 'off'. Your string itself contains
no 'extra' backslashes.

When you write e.g. "C:\\newdir " in your C++ source
text, this expresses the string "C:\newdir" . There's
no 'extra' backslash except in your C++ source code.


Try this example:

#include <iostream>

int main()
{
std::cout << "c:\\newdir " << '\n';
return 0;
}

Note that the output is:

c:\newdir


[color=blue]
> Thank alot. Please email me an answer if possible[/color]

This is a public forum. Post here, read here.

-Mike