Well, this is my first post in here with an answer i guess :)
Actually i'm currently using cefsharp web browser component one of my project, cefsharp run on chrome based browser and i want to copy img element one of webpage
With cefsharp you can manipulate browser only javascript, so i think we can handle it with using canvas element.
/*
'cause of lorempixel timeout, i used img onload function.
*/
function copyImage() {
var imgCap = document.getElementById('imgCap');
var imgCanvas = document.createElement('canvas');
imgCanvas.id = 'imgCanvas';
imgCanvas.height = 40;
imgCanvas.width = 120;
document.body.appendChild(imgCanvas);
var originalContext = imgCanvas.getContext('2d');
originalContext.drawImage(imgCap, 0, 0);
//return imgCanvas.toDataURL();
}
//document.onload = copyImage();
<img id="imgCap" src="http://lorempixel.com/120/40" onload="copyImage();"/>
with return imgCanvas.toDataURL(); you can get base64 encoded value and use wherever you want.
this is my cefsharp code, it's working.
string copyImageOtClipboardScript = "(function(){ try{var imgCap = document.getElementById('imgCap'); var imgCanvas = document.createElement('canvas'); imgCanvas.id = 'imgCanvas'; imgCanvas.height = 40; imgCanvas.width = 120; document.body.appendChild(imgCanvas); var originalContext = imgCanvas.getContext('2d'); originalContext.drawImage(imgCap, 0, 0); return imgCanvas.toDataURL(); }catch(e){ alert(e); } })();";
var task = chromeBrowser.EvaluateScriptAsync(copyImageOtClipboardScript).ContinueWith(x =>
{
var resp = x.Result;
if (resp.Success)
{
this.Invoke((MethodInvoker)delegate
{
Bitmap bmp = null;
string captchaResult = "", captchaBase64;
var bytes = Convert.FromBase64String(resp.Result.ToString().Replace("data:image/png;base64,", ""));
using (var imageFile = new FileStream("temp_captcha.png", FileMode.Create))
{
imageFile.Write(bytes, 0, bytes.Length);
imageFile.Flush();
}
});
}
});
