send image from javascript to C#

Question

I have a web application C#/HTML and I must pass an image from js --> C#. The command I use is canvas.toDataURL('image/png') but the system got in crash. I use IE10.

Is there any suggest?? Thanks...

[UPDATE] Scuse me..I have a setTimeout to delay the call.When timer elapsed, the error is

Uncaught TypeError: undefined is not a function

It seams like a variable visibility. Is it possible?

Pass an image from file or from canvas? Because the code you posted just works in IE/Chrome/FF. — A1rPun
– A1rPun, Commented Mar 2, 2015 at 15:51
I have a canvas and send the content of the canvas --> C#. I have a webBrowser in C# but the call, crash. — salvo italy
– salvo italy, Commented Mar 2, 2015 at 15:53
You give us very little information to work with.. Where did it crash? In the browser? In the back-end? Did it work on other browsers? — A1rPun
– A1rPun, Commented Mar 2, 2015 at 15:57
It is a little more clear.. Thanks. It look like your canvas variable is not defined properly. — A1rPun
– A1rPun, Commented Mar 2, 2015 at 16:19

gon250 · Accepted Answer · 2015-03-02 15:53:46Z

1

First you need add an input file:

<form id="submitfile" action="youraction" method="post" enctype="multipart/form-data">
  <input type="file" id="filetoup" name="file" accept="image/*" >

then you should use ajax:

$('#submitfile').ajaxForm({
complete: function(xhr) {
    alert("Upload complete");   
} 
});

Also you can use the way you are using

var canvasData = canvas.toDataURL("image/png");
var ajax = new XMLHttpRequest();
ajax.open("POST",'controller/action',false);
ajax.setRequestHeader('Content-Type', 'application/upload');
ajax.send(canvasData);

answered Mar 2, 2015 at 15:53

gon250

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2 Comments

salvo italy Over a year ago

Scuseme I quite confuse... I have a webcam and take a screen: then I would pass the image to C#. Can you explain how?

gon250 Over a year ago

Well, take a look this stackoverflow.com/questions/4912092/… let me know if you cant get it.

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