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Working with files

 
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dhasenan



Joined: 03 Feb 2005
Posts: 73
Location: New York
PostPosted: Fri Feb 04, 2005 12:35 pm    Post subject: Working with files Reply with quote
Two questions--

First, how do I go about creating a file through D? And how do I write to that file? Streams don't cut it, apparently; I keep getting errors when I try that. (And it was a five-line program, so yes, that was the error. The specific text was "Error: unable to write to stream".)

Here's the little test program I created:

Code:
import std.stream;
void main() {
   File f = new File("PATH/blargh");
   f.writeLine("Bleagh!");
   f.close();
}


Any suggestions?
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SpottedTiger



Joined: 29 Nov 2004
Posts: 7
Location: Pennsylvania, USA
PostPosted: Fri Feb 04, 2005 10:06 pm    Post subject: Reply with quote
dhasenan, by default the following "File f = new File( r"C:\blargh.txt" )" line does an open and not a create as you wanted. Please look at the D code below that I've tested, which seems to do what you want.

Code:

private import std.stream;
private import std.stdio;

void main()
{
   // FileMode.In     - Read In
   // FileMode.Out    - Write To
   // FileMode.OutNew - Create \ Empty Existing
   // FileMode.Append - Write Appending Data
   File f = new File( r"C:\blargh.txt", FileMode.OutNew );
   char[] sLine1;
   char[] sLine2;
   
   // Creates a file or
   // Empty the exists file
   //f.create( r"C:\blargh.txt" ); // same as the .OutNew above
   f.writeLine( "Bleagh!" );
   f.close();
   
   // Opens and read from the file
   f.open( r"C:\blargh.txt", FileMode.In );
   sLine1 = f.readLine();
   f.close();
   
   writefln( "1st.sLine1=\"?s\"", sLine1 );
   
   // Append new data to the end of the file
   f.open( r"C:\blargh.txt", FileMode.Append );
   f.writeLine( "Bleagh2!" );
   f.close();
 
   f.open( r"C:\blargh.txt", FileMode.In );
   sLine1 = f.readLine();
   sLine2 = f.readLine();
   f.close();
   
   writefln( "2nd.sLine1=\"?s\"", sLine1 );
   writefln( "2nd.sLine2=\"?s\"", sLine2 );
 
   // Deletes the file
   f.remove( r"C:\blargh.txt" );
}


Quote:
Output:
C:\dmd>bin\dmd streamtest.d
C:\dmd\bin\..\..\dm\bin\link.exe streamtest,,,user32+kernel32/noi;

C:\dmd>streamtest
1st.sLine1="Bleagh!"
2nd.sLine1="Bleagh!"
2nd.sLine2="Bleagh2!"

C:\dmd>


David L.
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dhasenan



Joined: 03 Feb 2005
Posts: 73
Location: New York
PostPosted: Sat Feb 05, 2005 1:41 am    Post subject: Reply with quote
Thanks. Dare I ask, though, where this is documented?
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SpottedTiger



Joined: 29 Nov 2004
Posts: 7
Location: Pennsylvania, USA
PostPosted: Sat Feb 05, 2005 5:28 pm    Post subject: Reply with quote
dhasenan: You're welcome! Very Happy

Well, for a high level view that gives all the functions and their parameters, you'll have to go to the DigitalMars D website (http://www.digitalmars.com/d/) then click on the "Phobos (Runtime Library)" link, and from there click on the "std.stream" link or scroll down to it. But to really find out more details as I had to do in answering your question, you'll have to look into the stream.d file itself...which I found at "C:\dmd\src\phobos\std\stream.d" on my WinXP machine.

Also looking at the "Tutorials" section here at dSource.org (http://www.dsource.org/tutorials/) will many times have the an example, or even my site's small "D Programming 101" section (http://spottedtiger.tripod.com/D_Language/D_Hub_D_Basics_XP.html), but neither one currently has a good example that fits your question. So, I guess I should go ahead and add this example I wrote for you and put it in the tutorials section to help others.

Anyway, I hope you'll continue to explore programming in D, and if you have a question just feel free to ask. There are many very friendly and helpful people here. Wink
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jcc7



Joined: 22 Feb 2004
Posts: 657
Location: Muskogee, OK, USA
PostPosted: Sat Feb 05, 2005 9:47 pm    Post subject: Reply with quote
SpottedTiger wrote:
So, I guess I should go ahead and add this example I wrote for you and put it in the tutorials section to help others.
Thanks for adding the example.

I would've sworn there was already a simple example for output to a file using std.stream, but I can't find it now so I must've imagined it. Wink
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SpottedTiger



Joined: 29 Nov 2004
Posts: 7
Location: Pennsylvania, USA
PostPosted: Sun Feb 06, 2005 11:57 pm    Post subject: Reply with quote
jcc7: You're welcome...yeah I thought there was one too. But all I found was your example reading in a input file.
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