Mixing
post/parse canvas image data from nodejs
I have been trying to submit an image being rendered on a html canvas to a nodejs http server however im having an issue parsing the submitted form on the recieving end:
ipcMain.on('resizeOK', (event, arg) => {
if(currentImage){
var formData = {
my_field: 'my_value',
// my_file: fs.createReadStream(imagepath), - old way using a local path
my_file: currentImage, //new way using the data from an image canvas
my_width : arg.widthData,
my_height : arg.heightData,
my_quality : arg.quality
};
request.post({url:'http://localhost:8080/resize', formData: formData}, function optionalCallback(err, httpResponse, body) {
if (err) {
return console.error('upload failed:', err);
}
console.log('Upload successful! Server responded with:', body);
});
}
});
// how the image is retrieved from the current canvas
var currentImage = canvas.toDataURL("image/png");
//HTTP server being posted to
if (req.url == '/resize') {
var form = new formidable.IncomingForm();
form.parse(req, function (err, fields, files) {
var output = util.inspect({fields: fields, files: files});
var newWidth = fields['my_width'];
var newHeight = fields['my_height'];
var quality = fields['my_quality'];
res.write('File uploaded to '+output + "");
res.end();
});
}
After reading a number of articles it seems many have attempted the same thing however in pure javascript not in nodejs : http://www.nixtu.info/2013/06/how-to-upload-canvas-data-to-server.html
however the example here makes use of BLOB which is unavailable directly in nodejs.
The current error i recieved now is a "write after end" server response, which has only occured after swapping out submission of a standard image via a local image path with the uri-data from the canvas element.
Is there a simple way to post my data-uri and parse it back into a usable js object on the http nodejs server?
javascript node.js post http-post
asked Jan 2 at 20:12
D3181D3181
1,29641030
add a comment |
I have been trying to submit an image being rendered on a html canvas to a nodejs http server however im having an issue parsing the submitted form on the recieving end:
ipcMain.on('resizeOK', (event, arg) => {
if(currentImage){
var formData = {
my_field: 'my_value',
// my_file: fs.createReadStream(imagepath), - old way using a local path
my_file: currentImage, //new way using the data from an image canvas
my_width : arg.widthData,
my_height : arg.heightData,
my_quality : arg.quality
};
request.post({url:'http://localhost:8080/resize', formData: formData}, function optionalCallback(err, httpResponse, body) {
if (err) {
return console.error('upload failed:', err);
}
console.log('Upload successful! Server responded with:', body);
});
}
});
// how the image is retrieved from the current canvas
var currentImage = canvas.toDataURL("image/png");
//HTTP server being posted to
if (req.url == '/resize') {
var form = new formidable.IncomingForm();
form.parse(req, function (err, fields, files) {
var output = util.inspect({fields: fields, files: files});
var newWidth = fields['my_width'];
var newHeight = fields['my_height'];
var quality = fields['my_quality'];
res.write('File uploaded to '+output + "");
res.end();
});
}
After reading a number of articles it seems many have attempted the same thing however in pure javascript not in nodejs : http://www.nixtu.info/2013/06/how-to-upload-canvas-data-to-server.html
however the example here makes use of BLOB which is unavailable directly in nodejs.
The current error i recieved now is a "write after end" server response, which has only occured after swapping out submission of a standard image via a local image path with the uri-data from the canvas element.
Is there a simple way to post my data-uri and parse it back into a usable js object on the http nodejs server?
javascript node.js post http-post
asked Jan 2 at 20:12
D3181D3181
1,29641030
add a comment |
I have been trying to submit an image being rendered on a html canvas to a nodejs http server however im having an issue parsing the submitted form on the recieving end:
ipcMain.on('resizeOK', (event, arg) => {
if(currentImage){
var formData = {
my_field: 'my_value',
// my_file: fs.createReadStream(imagepath), - old way using a local path
my_file: currentImage, //new way using the data from an image canvas
my_width : arg.widthData,
my_height : arg.heightData,
my_quality : arg.quality
};
request.post({url:'http://localhost:8080/resize', formData: formData}, function optionalCallback(err, httpResponse, body) {
if (err) {
return console.error('upload failed:', err);
}
console.log('Upload successful! Server responded with:', body);
});
}
});
// how the image is retrieved from the current canvas
var currentImage = canvas.toDataURL("image/png");
//HTTP server being posted to
if (req.url == '/resize') {
var form = new formidable.IncomingForm();
form.parse(req, function (err, fields, files) {
var output = util.inspect({fields: fields, files: files});
var newWidth = fields['my_width'];
var newHeight = fields['my_height'];
var quality = fields['my_quality'];
res.write('File uploaded to '+output + "");
res.end();
});
}
After reading a number of articles it seems many have attempted the same thing however in pure javascript not in nodejs : http://www.nixtu.info/2013/06/how-to-upload-canvas-data-to-server.html
however the example here makes use of BLOB which is unavailable directly in nodejs.
The current error i recieved now is a "write after end" server response, which has only occured after swapping out submission of a standard image via a local image path with the uri-data from the canvas element.
Is there a simple way to post my data-uri and parse it back into a usable js object on the http nodejs server?
javascript node.js post http-post
asked Jan 2 at 20:12
D3181D3181
1,29641030
I have been trying to submit an image being rendered on a html canvas to a nodejs http server however im having an issue parsing the submitted form on the recieving end:
ipcMain.on('resizeOK', (event, arg) => {
if(currentImage){
var formData = {
my_field: 'my_value',
// my_file: fs.createReadStream(imagepath), - old way using a local path
my_file: currentImage, //new way using the data from an image canvas
my_width : arg.widthData,
my_height : arg.heightData,
my_quality : arg.quality
};
request.post({url:'http://localhost:8080/resize', formData: formData}, function optionalCallback(err, httpResponse, body) {
if (err) {
return console.error('upload failed:', err);
}
console.log('Upload successful! Server responded with:', body);
});
}
});
// how the image is retrieved from the current canvas
var currentImage = canvas.toDataURL("image/png");
//HTTP server being posted to
if (req.url == '/resize') {
var form = new formidable.IncomingForm();
form.parse(req, function (err, fields, files) {
var output = util.inspect({fields: fields, files: files});
var newWidth = fields['my_width'];
var newHeight = fields['my_height'];
var quality = fields['my_quality'];
res.write('File uploaded to '+output + "");
res.end();
});
}
After reading a number of articles it seems many have attempted the same thing however in pure javascript not in nodejs : http://www.nixtu.info/2013/06/how-to-upload-canvas-data-to-server.html
however the example here makes use of BLOB which is unavailable directly in nodejs.
The current error i recieved now is a "write after end" server response, which has only occured after swapping out submission of a standard image via a local image path with the uri-data from the canvas element.
Is there a simple way to post my data-uri and parse it back into a usable js object on the http nodejs server?
javascript node.js post http-post
javascript node.js post http-post
asked Jan 2 at 20:12
D3181D3181
1,29641030
asked Jan 2 at 20:12
D3181D3181
1,29641030
edited Jan 3 at 7:28
D3181
asked Jan 2 at 20:12
D3181D3181
1,29641030
asked Jan 2 at 20:12
D3181D3181
1,29641030
asked Jan 2 at 20:12
D3181D3181
1,29641030
1,29641030
add a comment |
add a comment |
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