node-gd does not work.

[Ziobudda]

Hi all, I’m creating a little node.js app (for test) that get image from a FORM, save it in a directory and create a thumbnail version. 

Form and upload works with no problem, but I can not create the thumbnail. 

This is my code: 

app.post('/upload', function (req, res) {

    var tempPath = req.files.file.path,

        name = '',

        targetPath = '';

    

    fileExist = true; 

    fileNumber = 0;

    

    var fileType = path.extname(req.files.file.name);

    var fileName = path.basename(req.files.file.name,fileType);

    while (fileExist) {

  

      fileNumber_str = fileNumber.toString(); 

  

      var current = fileName + "_" +fileNumber_str + fileType;

      console.log("Controllo per "+current);

  

      if (fs.existsSync(__dirname + "/images/orig/" + current)) {

          console.log("--> Esiste");

          fileNumber++;

      } else {

          var newPath = __dirname + "/images/orig/" + current;

          console.log("nuovo nome : "+newPath);

          fs.rename(tempPath, newPath, function(err) {

                if (err) throw err;

                //Ora creo il thumb

                var newPathT = __dirname + "/images/thumb/" + current;

                gd.openPng([newPath],function(png,path){

                     if(png) {

                        var w = Math.floor(png.width/2), h = Math.floor(png.height/2);

                        var target_png = gd.createTrueColor(w, h);

                  

                        png.copyResampled(target_png,0,0,0,0,w,h,png.width,png.height);

                        target_png.savePng(newPathT, 1, gd.noop);

                     }

                     else {

                       console.log("no png");

                       console.log(png);

                       console.log(path); 

                     }

                });

                console.log("Upload completed!");

            });

  

          break;

      }

    }

    

    res.redirect("/");

res.end();    

});

The function gd.open(…) set always “png” variables to “undefined”. I don’t understand where is my error. 

Thanks in advance and sorry for my bad english.

M.

-- 

Michel 'ZioBudda' Morelli                       mic...@ziobuddalabs.it

Sviluppo applicazioni CMS DRUPAL e web dinamiche (LAMP+Ajax)

Telefono: 0200619074

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[Luca Morettoni]

On 13 February 2014 09:59, Ziobudda <ziob...@gmail.com> wrote:
> The function gd.open(...) set always "png" variables to "undefined". I don't

> understand where is my error.
> Thanks in advance and sorry for my bad english.

hello Zio! I don't know the gd lib, but usually a callback function
uses the fingerprint "callback(err, data)", so the first param usually
need to be undef or null if the call is correct...
Can you drive me to the documentation of the "gd" lib?

--
Luca Morettoni <luca(AT)morettoni.net> | http://www.morettoni.net
http://it.linkedin.com/in/morettoni/ | http://twitter.com/morettoni
Google+ profile: https://www.google.com/+LucaMorettoni
Member of GDG Perugia: http://perugia.gtugs.org

[Ziobudda]

Can you drive me to the documentation of the "gd" lib? 

Hi Luca, I have get node-gd from github:

https://github.com/taggon/node-gd

M.

-- 

Michel 'ZioBudda' Morelli                       ziob...@gmail.com

[Alex Kocharin]

First argument of openPng is an error. If you don't have an error, it will be undefined.

PS: I think "node-gd" library is a great example of why npm should have namespaces :P

[Luca Morettoni]

On 13 February 2014 10:12, Alex Kocharin <al...@equenext.com> wrote:
> First argument of openPng is an error. If you don't have an error, it will
> be undefined.

https://github.com/taggon/node-gd#using-gd

I think the Michel code is ok... later I'll try to run the example locally...

[Alex Kocharin]

What node-gd are we talking about?

taggon/node-gd? mikesmullin/node-gd? andris9/node-gd? hanssonlarsson/node-gd?

Okay, I see it's the first one. I just mistook it for https://npmjs.org/package/node-gd .

npm registry needs namespaces :P

[Mr G]

Hi,

Did you get anywhere with this?  I have a similar problem.

png is set to null when trying to open the image file,

    var projectRootServer="../../../../../server/";
    var source=projectRootServer+"forrest.png";
    var target=projectRootServer+'privateimages/target_image.png';

    var gd = Meteor.npmRequire('node-gd');
    var path = Meteor.npmRequire('path');
    var fs = Meteor.npmRequire('fs');

if (fs.exists(target)) fs.unlink(target);

gd.openPng(source,
function(png, fs) {
   console.log(png)
    if(png) {
     // png is null
    }
}
);

Driving me crazy and now time for bed!

G :)