Thank bro to help,
I change to this code and get the same error:
var fs = require('fs');
var fName = 'text.txt';
fNameStat = fs.statSync(fName);
fs.watch(fName, function (evento, arquivo) {
fNameStatChanged = fs.statSync(arquivo);
console.log('file changed from ' + fNameStat.size + ' to ' +
fNameStatChanged.size);
fs.open(fName, 'r', function(err, fd) {
var newDataLength = fNameStatChanged.size - fNameStat.size;
console.log(newDataLength);
var buffer = new Buffer(newDataLength);
console.log(buffer);
console.log(fd);
if(newDataLength < 0 ){
newDataLength = 0;
}
fs.read(fd, buffer, 0, newDataLength, null, function (err,
bytesRead, newData) {
if (err) {
console.log(err);
};
console.log(newData.toString());
});
fNameStat = fs.statSync(fName);
});
});
On Monday, December 9, 2013 8:00:56 AM UTC-2, Fedor Indutny wrote:
>
> Hello!
>
> Perhaps, you are trying to create a Buffer of negative length?
>
> Also, I believe, that you do not need to pass encoding argument to the
> Buffer's constructor if you're creating just a fixed-size buffer.
>
> On Mon, Dec 9, 2013 at 1:58 PM, Felipe Silveira
> <[email protected]<javascript:>>
> wrote:
> > Hi There,
> >
> > I'm trying to tail a file in nodejs, the code is this:
> >
> > var fs = require('fs');
> > var fName = 'file.txt';
> > fNameStat = fs.statSync(fName);
> > fs.watch(fName, function (evento, arquivo) {
> > fNameStatChanged = fs.statSync(arquivo);
> > console.log('file changed from ' + fNameStat.size + ' to ' +
> > fNameStatChanged.size);
> > fs.open(fName, 'r', function(err, fd) {
> > var newDataLength = fNameStatChanged.size - fNameStat.size;
> > console.log(newDataLength);
> > var buffer = new Buffer(newDataLength, 'utf-8');
> > console.log(buffer);
> > console.log(fd);
> > fs.read(fd, buffer, 0, newDataLength, null, function (err,
> > bytesRead, newData) {
> > if (err) {
> > console.log(err);
> > };
> > console.log(newData.toString());
> >
> > });
> > fNameStat = fs.statSync(fName);
> > });
> >
> > });
> >
> >
> > I'm getting this error:
> >
> > fs.js:267
> > binding.read(fd, buffer, offset, length, position, wrapper);
> > ^
> > Error: Offset is out of bounds
> > at Object.read (fs.js:267:11)
> > at Object.oncomplete (/var/www/read/test.js:13:15)
> >
> > Anyone know whats happened?
> >
> > Regards,
> >
> > Felipe Silveira Mendes
> > Site - Twitter - Blog
> > Web Developer
> > (31) 8370-9090 (Claro)
> > (31) 9433-9310 (Tim)
> > [email protected] <javascript:>
> >
> >
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