Can I write/read local file on hard drive in FireFox (Netscape) ?

Alex · Mar 1, 2006

Yes you can:

<html><head><script language="javascript">

SaveToFile('This is a text to save in a file', 'C:\\temp\\test.txt');
alert(read('C:\\temp\\test.txt'));

function SaveToFile (text, fileName) {
try
{netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');}
catch (e) {alert("Permission to write file denied."); return 0;}
var file =
Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
file.initWithPath(fileName);
if (!file.exists()) file.create(0x00, 0644);
var outputStream =
Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream);
outputStream.init(file,0x20 | 0x02,00004,null);
outputStream.write(text, text.length);
outputStream.flush();
outputStream.close();
}

function read(myfile) {
try
{netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");}
catch (e) {alert("Permission to read file denied."); return '';}
var file =
Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
file.initWithPath(myfile);
if (!file.exists()) {alert("File not found."); return '';}
var is =
Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(
Components.interfaces.nsIFileInputStream );
is.init(file,0x01, 00004, null);
var sis =
Components.classes["@mozilla.org/scriptableinputstream;1"].createInstance(
Components.interfaces.nsIScriptableInputStream );
sis.init(is);
var output = sis.read(sis.available());
return output;
}

</script></head><body></body></html>

Randy Webb · Mar 1, 2006

Alex said the following on 2/28/2006 11:03 PM:

Yes you can:

Yes I can what?

No DTD.

<html><head><script language="javascript">

Type attribute is mandatory, language attribute is deprecated.

SaveToFile('This is a text to save in a file', 'C:\\temp\\test.txt');
alert(read('C:\\temp\\test.txt'));

function SaveToFile (text, fileName) {
try
{netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');}
catch (e) {alert("Permission to write file denied."); return 0;}

And now, you have not written to my hard drive. Try again

Thomas 'PointedEars' Lahn · Mar 1, 2006

Alex said:
Yes you can:

Nobody ever doubted this. In fact, this has been mentioned at least by me
several times before. However, the script needs the privileges, and it
can only get the privileges if it is signed, or, if it is not signed, the
security settings of the client are reduced, which opens a security leak
for all other Web sites.

PointedEars

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Can I write/read local file on hard drive in FireFox (Netscape) ?

Alex

Randy Webb

Thomas 'PointedEars' Lahn

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