Files
phantomjs/examples/echoToFile.js
T
Milian Wolff 61eb86782b Filesystem module should allow reading and writing binary files.
CommonJS proposal: http://wiki.commonjs.org/wiki/Filesystem/A.
It's called "raw".

http://code.google.com/p/phantomjs/issues/detail?id=400

Squashed commit of the following:

commit dd5fab4778bb7b67f1eca26a07d430aadd458c6e
Author: Milian Wolff <milian.wolff@kdab.com>
Date:   Thu Feb 23 16:19:21 2012 +0100

    the "mode" string is now properly parsed, and not only the first
    char evaluated. This allows us to do fancy things like

    fs.open(file, "rw+"); // read/write/append

    Furthermore .read() is adapted such that it will always return the
    full file contents, no matter where we have seeked to before (i.e.
    by passing + we seek to the end, hence read() would always return
    an empty string).

    To open a binary file, pass "b" in the mode string to fs.open, e.g.:

    fs.open(file, "rb"); // read binary
    fs.open(file, "wb"); // write binary
    fs.open(file, "rwb+"); // read/write binary, append

    alternatively, one can use these shortcuts:

    fs.write(file, contents, "b"); // write binary
    fs.read(file, "b"); // read binary

    Unit tests are extended and the echoToFile.js example fixed (it did not
    close the file, which lead to the contents never getting written
    on-disk since flush() is never called).

    Also note that the FileSystem::open method was cleaned up and at least
    one memory leak (if QFile* could not open) was fixed. The code should
    now also be more C++-like.

commit 41139951138491459accefab22d48eba7b0b9900
Author: Milian Wolff <milian.wolff@kdab.com>
Date:   Wed Feb 15 16:39:23 2012 +0100

    use QString instead of QByteArray for raw binary data

    QByteArray is simply unusable in JavaScript, since functions like
    e.g. window.btoa expect a string. Also there is no sane way to
    create a byte array in javascript, as ArrayBuffer e.g. is not
    supported by QScript (at least there is no conversion in place).

    If we use QString and some custom read/write code this all works
    as expected though, we can use window.btoa to base64 encode binary
    data and we can create random binary data using String.fromCharCode

    also adds a unit test

commit e45673486ef27daf916902153217f9e5001b68c9
Author: Milian Wolff <milian.wolff@kdab.com>
Date:   Wed Feb 15 14:39:15 2012 +0100

    make it possible to read/write raw/binary files

    this adds File::readRaw and File::writeRaw functions,
    as well as 'shimmed' versions FS::readRaw and FS::writeRaw

    these functions directly use QFile and QByteArray instead of
    QTextStream and QString, making it possible to read and write
    binary data, e.g. images and such.
2012-02-29 07:55:00 -08:00

24 lines
596 B
JavaScript

// echoToFile.js - Write in a given file all the parameters passed on the CLI
var fs = require('fs');
if (phantom.args.length < 2) {
console.log("Usage: echoToFile.js DESTINATION_FILE <arguments to echo...>");
phantom.exit();
} else {
var content = '',
f = null;
for ( i= 1; i < phantom.args.length; ++i ) {
content += phantom.args[i] + (i === phantom.args.length-1 ? '' : ' ');
}
try {
f = fs.open(phantom.args[0], "w");
f.writeLine(content);
f.close();
} catch (e) {
console.log(e);
}
phantom.exit();
}