Hello,
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir"); But I have not been able to get this data into a file.
I understand that stdout is a pointer to a file, and so I should be
able to open and read this file without physically viewing the screen.
Anyway, any ideas? Thanks in advance.
andrew
13  3498 
Andrew wrote:
Anyway, any ideas? Thanks in advance.
What OS are you using?
"Andrew" <an************ @gmail.comwrite s:
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir"); But I have not been able to get this data into a file.
I understand that stdout is a pointer to a file, and so I should be
able to open and read this file without physically viewing the screen.
Ask in a newsgroup that deals with your operating system. Standard C
doesn't even have a concept of directories.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
Andrew wrote:
Hello,
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir"); But I have not been able to get this data into a file.
I understand that stdout is a pointer to a file, and so I should be
able to open and read this file without physically viewing the screen.
Anyway, any ideas? Thanks in advance.
andrew
If you can use system("dir"); , why don't you use the command "dir * >
filenames.txt" to get what you want?
"Andrew" <an************ @gmail.comwrote in message
news:11******** ************@h4 8g2000cwc.googl egroups.com...
Hello,
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir"); But I have not been able to get this data into a file.
I understand that stdout is a pointer to a file, and so I should be
able to open and read this file without physically viewing the screen.
Anyway, any ideas? Thanks in advance.
andrew
Probably your operating system has a specific system call for
enumarating the contents of directories. If it is windows, as it
seems from the dir command you are using then check the
FindFirstFile and FindNextFile system calls.
For more info, you should ask again in a related group.
Serafeim
"Papastefan os Serafeim" <se******@otene t.grwrote in message
news:ef******** ***@ulysses.noc .ntua.gr...
>
"Andrew" <an************ @gmail.comwrote in message
[system specific question}
Probably your operating system has a specific system call for
enumarating the contents of directories. If it is windows, as it
seems from the dir command you are using then check the
FindFirstFile and FindNextFile system calls.
For more info, you should ask again in a related group.
Serafeim
I was going to accuse you of misspelling seraphim in your moniker, but since
you're greek, I'm going to let that one go. OP needs to rephrase the
question to make it topical. Since he has the odor of windows, he can
expect the customary tomato in the face in clc.
Set the "sort by" on your newsreader to "subject" and look for "Parsing a
path name" to see how it is that one can talk about path in a manner
relevant to the C programming language. The other half of the question is
how to redirect stdout to a file, which I don't pretend to know. EC
p.s. Don't get stung by '/' vs '\'; I can only ever remember it's one or the
other.
"Andrew" <an************ @gmail.comwrote in message
news:11******** ************@h4 8g2000cwc.googl egroups.com...
Hello,
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir");
I guess at this point I should include the usual disclaimer. Standard "C"
know nothing about the "system" call, its a (fairly common) extension. But
it is an extension.
But I have not been able to get this data into a file.
I understand that stdout is a pointer to a file, and so I should be
able to open and read this file without physically viewing the screen.
Thats because system creates a seperate process. As others have pointed out
you can do something like:-
system("dir /b >files.txt")l
but of course if there is already a "files.txt" you are in trouble....
Possiblly something like:-
system("dir /b >%tmp%\files.tx t");
is safer, but then you need to find out whats in %tmp% in order to open it
and read it....
Anyway, any ideas? Thanks in advance.
andrew
Dave.
In article <Uc************ ********@eclips e.net.uk>,
David Wade <g8***@yahoo.co mwrote:
>
"Andrew" <an************ @gmail.comwrote in message
news:11******* *************@h 48g2000cwc.goog legroups.com...
>Hello,
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir" );
I guess at this point I should include the usual disclaimer. Standard "C"
know nothing about the "system" call, its a (fairly common) extension. But
it is an extension.
Actually, standard "C" has a system() function. It just doesn't say
anything (*) about what it does.
(*) There's an exception to this - others will no doubt chime in with it
by and by.
"Kenny McCormack" <ga*****@xmissi on.xmission.com wrote in message
news:eg******** **@news.xmissio n.com...
In article <Uc************ ********@eclips e.net.uk>,
David Wade <g8***@yahoo.co mwrote:
"Andrew" <an************ @gmail.comwrote in message
news:11******** ************@h4 8g2000cwc.googl egroups.com...
Hello,
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir");
I guess at this point I should include the usual disclaimer. Standard "C"
know nothing about the "system" call, its a (fairly common) extension.
But
it is an extension.
Actually, standard "C" has a system() function. It just doesn't say
anything (*) about what it does.
(*) There's an exception to this - others will no doubt chime in with it
by and by.
Kenny,
I must be getting old. I have read "The Standard C Library" many times and
always missed the stuff on SYSTEM. I guess as it inlcudes "getenv()" you can
"sort of" do this....
Dave.
David Wade wrote:
"Kenny McCormack" <ga*****@xmissi on.xmission.com wrote in message
news:eg******** **@news.xmissio n.com...
>In article <Uc************ ********@eclips e.net.uk>,
David Wade <g8***@yahoo.co mwrote:
>>"Andrew" <an************ @gmail.comwrote in message
news:11****** **************@ h48g2000cwc.goo glegroups.com.. .
Hello,
I am trying to find a way to take the contents of a directory and
write it into a file. I have a directory that has several hundred text
files, and I want to create a file containing all of the names of those
files. I can get the contents of the directory onto the screen using
system("dir" );
I guess at this point I should include the usual disclaimer. Standard "C"
know nothing about the "system" call, its a (fairly common) extension.
But
>>it is an extension.
Actually, standard "C" has a system() function. It just doesn't say
anything (*) about what it does.
(*) There's an exception to this - others will no doubt chime in with it
by and by.
Kenny,
I must be getting old. I have read "The Standard C Library" many times and
always missed the stuff on SYSTEM. I guess as it inlcudes "getenv()" you can
"sort of" do this....
Dave.
system(const char *s) is in stlib.h
"If s is not a null pointer, the function passes the string s to be
executed by a command processor, supplied by the target environment, and
returns the status reported by the command processor. If s is a null
pointer, the function returns nonzero only if the target environment
supplies a command processor. Each implementation defines what strings
its command processor accepts." This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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