javascript - GraphicsMagick processes resulting in empty file -

i'm doing this

gm(jpgname).setformat('jpg')     .resize(160,158)     .compress('jpeg') .write(fs.createwritestream(jpgname),function(err){     if(err){         console.log(err,jpgname);     res.send(400);     }else{         console.log('file formated jpg' + jpgname); 

and get

{ [error: command failed: gm convert: empty input file (/home/ubuntu/node/uploads/icon.jpg). ] code: 1, signal: null } 

if stop code right before first line written here, , @ file, has file length. if let process happen (error out) @ file, has size of 0 bytes.

i tried this:

fs.stat(jpgname, function (err, stats) {     console.log('file size:',stats.size);     gm(jpgname).setformat('jpg')         .resize(160,158)         .compress('jpeg')         .write(fs.createwritestream(jpgname),function(err){             if(err){                 console.log('console.log error writing jpg file',err,jpgname);                     fs.unlink(jpgname);                         callback(400);                         return;                     }else{//... 

and i'm getting file size back, know it's not empty before start process.

edit: start process on form.on('end') sure entire upload process done.

the entire function:

function formatprofileimage(req,form,file,callback){     console.log('formatting profile image');     var ext = file.name.split('.')[1].tolowercase();     var name = encodeuricomponent(file.name.split('.')[0].tolowercase());     var smallname = form.uploaddir+"/"+"small_"+name+".jpg";     var jpgname = form.uploaddir + "/" + name+'.jpg';      console.log('extension:',ext);     console.log('name:',name);     console.log('smallname:',smallname);     console.log('jpgname:',jpgname);      if(!(ext == "png" || ext == "jpeg"|| ext == "jpg"|| ext == "gif")){         fs.unlink(file.path);         console.log("extension rejected");         callback(415);         return;      }      console.log('renaming file ' + file.path + ' ' + jpgname);      fs.rename(file.path,jpgname,function(err){         if(err){             console.log('error renaming file',err);             callback(400);             return;         }          console.log('file renamed');         fs.stat(jpgname, function (err, stats) {             console.log('file size:',stats.size);             if(!(typeof req.query.tenant === 'undefined')){                 //rename jpg                 gm(jpgname).setformat('jpg')                 .resize(160,158)                 .compress('jpeg')                 .write(fs.createwritestream(jpgname),function(err){                     if(err){                         console.log('console.log error writing jpg file',err,jpgname);                         fs.unlink(jpgname);                         callback(400);                         return;                     }else{                         console.log('file formated jpg' + jpgname);                         //make "thumbnail"                         gm(jpgname).setformat('jpg')                         .resize(50)                         .write(fs.createwritestream(smallname),function(err){                             if(err){                                 fs.unlink(smallname);                                 console.log('error writing thumbnail',err,smallname);                                 callback(400);                                 return;                             }else{                                 console.log('thumbnail created' + smallname);                                 //upload                                 uploads3(jpgname,req.query.tenant,function(back){                                     if(back.success){                                         console.log('success ' +back.url);                                         callback(back.url);                                         fs.unlink(jpgname);                                     }else{                                         console.log('error uploading' + jpgname, back);                                         callback(400);                                         fs.unlink(jpgname);                                         return;                                     }                                 });                                 uploads3(smallname,req.query.tenant,function(back){                                     if(back.success){                                         console.log('success ' +back.url);                                         fs.unlink(smallname);                                     }else{                                         console.log('error uploading ' + smallname, back);                                         callback(400);                                         fs.unlink(smallname);                                         return;                                     }                                 });                             }                         });                     }                 });             }         });     }); } 

.write() accept string path. need replace stream string (location, resulting image must me saved).

gm support 3 ways of saving files.

1) save file. simple, use .write() , send parameter string, file should saved. example:

gm('image.png')     .resize()     .write('resized.png', function (error) {         if (error) {             console.error(error);         }     }); 

2) use streams, example:

gm('image.png')     .resize()     .stream(function (error, stdout, stderr) {         var writestream = fs.createwritestream('resized.jpg');         stdout.pipe(writestream);     }); 

3) , last 1 - buffers:

gm('image.png')     .resize()     .tobuffer(function (error, buffer) {         if (error) {             console.error(error);         }     });