Smalltalk › Instantiations

Concatenating/appending files on Windows

_‹ Previous Topic Next Topic _›

Classic

List

Threaded

4 messages Options

Wayne Johnston

Concatenating/appending files on Windows

I don't see a VA method to append one file onto another. It's easy to open the "source" file and get its #contents, and write that to the "destination" file. But that means the entire contents of the source file is in memory, which can be a problem if it's huge.

Is there another way besides getting chunks of the source file and appending each chunk?

Guess I could create & invoke a command/batch script which runs the COPY command to do the append...

--
You received this message because you are subscribed to the Google Groups "VA Smalltalk" group.
To unsubscribe from this group and stop receiving emails from it, send an email to [hidden email].
To post to this group, send email to [hidden email].
Visit this group at https://groups.google.com/group/va-smalltalk.
For more options, visit https://groups.google.com/d/optout.

Seth Berman

Re: Concatenating/appending files on Windows

Hi Wayne,

So are you saying you do not wish to do something like:

| dest source bufferSize bytesLeft sourceSize |

source := CfsReadFileStream open: 'fileA.txt'.

source isBytes: true.

sourceSize := source size.

dest := CfsWriteFileStream open: 'fileB.txt'.

dest setToEnd.

dest isBytes: true.

bytesLeft := sourceSize.

bufferSize := 16 * 1024.

[

[source atEnd] whileFalse: [

dest nextPutAll: (source next: (bytesLeft min: bufferSize)).

bytesLeft := bytesLeft - (bytesLeft min: bufferSize).

] ensure: [source close. dest close]

On Thursday, March 29, 2018 at 1:02:11 PM UTC-4, Wayne Johnston wrote:

I don't see a VA method to append one file onto another. It's easy to open the "source" file and get its #contents, and write that to the "destination" file. But that means the entire contents of the source file is in memory, which can be a problem if it's huge.

Is there another way besides getting chunks of the source file and appending each chunk?

Guess I could create & invoke a command/batch script which runs the COPY command to do the append...

Wayne Johnston

Re: Concatenating/appending files on Windows

That is indeed what I'd like to do - avoiding #contents. Thanks for writing my code for me! ;-) Actually I was coming up with equivalent code but I like your isBytes:true, and I was going to use a 32k buffer for no good reason...

Seth Berman

Re: Concatenating/appending files on Windows

Hi Wayne,

My pleasure. Yeah that's ok...I wasn't in the mood to write my own code today:)

-- Seth

On Thursday, March 29, 2018 at 4:46:14 PM UTC-4, Wayne Johnston wrote:

That is indeed what I'd like to do - avoiding #contents. Thanks for writing my code for me! ;-) Actually I was coming up with equivalent code but I like your isBytes:true, and I was going to use a 32k buffer for no good reason...