Re: Reading/Writing from files

On 02/22/2012 04:17 PM, Shibu Narayanan wrote:
> Hi,
> I see the below sample code given
>
> Read into a stream or a string
>
> This will allow you to read a file without locking up the UI thread.  This sample code uses NetUtil.jsm. You can pass an nsIFile object directly into NetUtil.asyncFetch:
>
> <---- code starts here ----->
>      Components.utils.import("resource://gre/modules/NetUtil.jsm");
>
>      NetUtil.asyncFetch(file, function(inputStream, status) {
>        if (!Components.isSuccessCode(status)) {
>          // Handle error!
>          return;
>        }
>
>        // The file data is contained within inputStream.
>        // You can read it into a string with
>        var data = NetUtil.readInputStreamToString(inputStream, inputStream.available());
>        alert(data);
>      });
>
> <---- code ends here ----->
>
> I do not understand the code.
> Where do I put the NetUtil.jsm file?  Do I create a folder by name<base_dir>/gre/modules/ ? Where do I specify the data file name in the code?
> Putting this code in some event handler will show the contents of a file?
>
> Can someone post a full method/function code which accepts a file URL and prints out the contents?  I have already downloaded NetUtil.jsm and FileUtil.jsm and added to my project.
>
> -Shibu

you have to create a 'modules' directory in you're project, and define a 
resource entry in the chrome.manifest, which points to that new 
directory, eg example of my chrome manifest

resource surveys file:////home/jpe/proj/surveys/cksdos/modules/
or
resource  surveys     		../modules/

jef