javascript - grabar - ¿Cómo subir una captura de pantalla usando html2canvas?
print screen javascript (3)
Usando html2canvas ¿cómo puedo guardar una captura de pantalla a un objeto? He estado explorando las demostraciones y veo que la función para generar la captura de pantalla se genera de la siguiente manera:
$(window).ready(function() {
(''body'').html2canvas();
});
Lo que he intentado hacer es
$(window).ready(function() {
canvasRecord = $(''body'').html2canvas();
dataURL = canvasRecord.toDataURL("image/png");
dataURL = dataURL.replace(/^data:image//(png|jpg);base64,/, "");
upload(dataURL);
});
Y, luego lo paso a mi función de upload() . El problema que tengo es que no puedo determinar dónde se está haciendo la captura de pantalla en la biblioteca html2canvas() o qué función la devuelve. Intenté convertir el objeto canvas utilizando esta respuesta de SO (aunque no estoy seguro de que deba hacer esto).
Acabo de hacer una pregunta sobre cómo subir un archivo a imgur , y las respuestas allí (especialmente @ bebraw) me ayudan a comprender lo que debo hacer.
La función de upload() es de la ayuda api de ejemplo de Imgur:
function upload(file) {
// file is from a <input> tag or from Drag''n Drop
// Is the file an image?
if (!file || !file.type.match(/image.*/)) return;
// It is!
// Let''s build a FormData object
var fd = new FormData();
fd.append("image", file); // Append the file
fd.append("key", "mykey"); // Get your own key: http://api.imgur.com/
// Create the XHR (Cross-Domain XHR FTW!!!)
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://api.imgur.com/2/upload.json"); // Boooom!
xhr.onload = function() {
// Big win!
// The URL of the image is:
JSON.parse(xhr.responseText).upload.links.imgur_page;
}
// Ok, I don''t handle the errors. An exercice for the reader.
// And now, we send the formdata
xhr.send(fd);
}
Este código funciona para mí. Generará una captura de pantalla por html2canvas, cargará la captura de pantalla para imgur api y devolverá la url de imgur.
<button class="upload" >Upload to Imgur</button>
<script>
$(".upload").on("click", function(event) {
html2canvas($(''body''), {
onrendered: function(canvas) {
document.body.appendChild(canvas);
try {
var img = canvas.toDataURL(''image/jpeg'', 0.9).split('','')[1];
} catch(e) {
var img = canvas.toDataURL().split('','')[1];
}
// open the popup in the click handler so it will not be blocked
var w = window.open();
w.document.write(''Uploading...'');
// upload to imgur using jquery/CORS
// https://developer.mozilla.org/En/HTTP_access_control
$.ajax({
url: ''http://api.imgur.com/2/upload.json'',
type: ''POST'',
data: {
type: ''base64'',
// get your key here, quick and fast http://imgur.com/register/api_anon
key: ''your api key'',
name: ''neon.jpg'',
title: ''test title'',
caption: ''test caption'',
image: img
},
dataType: ''json''
}).success(function(data) {
w.location.href = data[''upload''][''links''][''imgur_page''];
}).error(function() {
alert(''Could not reach api.imgur.com. Sorry :('');
w.close();
});
},
});
});
</script>
//Here I am using html2Canvas to capture screen and Java websockets to transfer data to server
//Limitation:Supported on latest browsers and Tomcat
Step1)Client Side : webSock.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!-- Arun HTML File -->>
<html>
<head>
<meta charset="utf-8">
<title>Tomcat web socket</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.js"></script>
<script type="text/javascript" src="html2canvas.js?rev032"></script>
<script type="text/javascript">
var ws = new WebSocket("ws://localhost:8080/WebSocketSample/wsocket");
ws.onopen = function () {
console.log("Web Socket Open");
};
ws.onmessage = function(message) {
console.log("MSG from Server :"+message.data);
//document.getElementById("msgArea").textContent += message.data + "/n";
document.getElementById("msgArea").textContent +" Data Send/n";
};
function postToServerNew(data) {
ws.send(JSON.stringify(data));
document.getElementById("msg").value = "";
}
//Set Interval
setInterval(function(){
var target = $(''body'');
html2canvas(target, {
onrendered: function(canvas) {
var data = canvas.toDataURL();
var jsonData = {
type: ''video'',
data: data,
duration: 5 ,
timestamp: 0, // set in worker
currentFolder: 0,// set in worker
};
postToServerNew(jsonData);
}
});
},9000);
function closeConnect() {
ws.close();
console.log("Web Socket Closed: Bye TC");
}
</script>
</head>
<body>
<div>
<textarea rows="18" cols="150" id="msgArea" readonly></textarea>
</div>
<div>
<input id="msg" type="text"/>
<button type="submit" id="sendButton" onclick="postToServerNew(''Arun'')">Send MSG</button>
</div>
</body>
</html>
Step2)Server Side
File 1)
package Arun.Work;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import javax.servlet.http.HttpServletRequest;
import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.WsOutbound;
/**
* Need tomcat-koyote.jar on class path, otherwise has compile error
* "the hierarchy of the type ... is inconsistent"
*
* @author Arun
*
*/
public class MyInBound extends MessageInbound {
private String name;
private WsOutbound myoutbound;
private String targetLocation;
public MyInBound(HttpServletRequest httpSerbletRequest, String targetLocation) {
this.targetLocation = targetLocation;
}
@Override
public void onOpen(WsOutbound outbound) {
System.out.println("Web Socket Opened..");
/*this.myoutbound = outbound;
try {
this.myoutbound.writeTextMessage(CharBuffer.wrap("Web Socket Opened.."));
} catch (Exception e) {
throw new RuntimeException(e);
}*/
}
@Override
public void onClose(int status) {
System.out.println("Close client");
// remove from list
}
@Override
protected void onBinaryMessage(ByteBuffer arg0) throws IOException {
System.out.println("onBinaryMessage Data");
try {
writeToFileNIOWay(new File(targetLocation), arg0.toString() + "/n");
} catch (Exception e) {
e.printStackTrace();
} finally {
//this.myoutbound.flush();
}
}// end of onBinaryMessage
@Override
protected void onTextMessage(CharBuffer inChar) throws IOException {
System.out.println("onTextMessage Data");
try {
writeToFileNIOWay(new File(targetLocation), inChar.toString() + "/n");
} catch (Exception e) {
e.printStackTrace();
} finally {
//this.myoutbound.flush();
}
}// end of onTextMessage
public void writeToFileNIOWay(File file, String messageToWrite) throws IOException {
System.out.println("Data Location:"+file+" Size:"+messageToWrite.length());
//synchronized (this){
byte[] messageBytes = messageToWrite.getBytes();
RandomAccessFile raf = new RandomAccessFile(file, "rw");
raf.seek(raf.length());
FileChannel fc = raf.getChannel();
MappedByteBuffer mbf = fc.map(FileChannel.MapMode.READ_WRITE, fc.position(), messageBytes.length);
mbf.put(messageBytes);
fc.close();
//}
}//end of method
/*
* //Working Fine public void writeToFileNIOWay(File file, String
* messageToWrite) throws IOException { byte[] messageBytes =
* messageToWrite.getBytes(Charset.forName("ISO-8859-1")); RandomAccessFile
* raf = new RandomAccessFile(file, "rw"); raf.seek(raf.length());
* FileChannel fc = raf.getChannel(); MappedByteBuffer mbf =
* fc.map(FileChannel.MapMode.READ_WRITE, fc.position(),
* messageBytes.length);
*
* mbf.put(messageBytes); fc.close(); }
*/
}
File 2)
package Arun.Work;
import java.io.File;
import java.util.concurrent.ConcurrentHashMap;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
/**
* WebSocketServlet is contained in catalina.jar. It also needs servlet-api.jar
* on build path
*
* @author Arun
*
*/
@WebServlet("/wsocket")
public class MyWebSocketServlet extends WebSocketServlet {
private static final long serialVersionUID = 1L;
// for new clients, <sessionId, streamInBound>
private static ConcurrentHashMap<String, StreamInbound> clients = new ConcurrentHashMap<String, StreamInbound>();
@Override
protected StreamInbound createWebSocketInbound(String protocol, HttpServletRequest httpServletRequest) {
// Check if exists
HttpSession session = httpServletRequest.getSession();
// find client
StreamInbound client = clients.get(session.getId());
if (null != client) {
return client;
} else {
System.out.println(" session.getId() :"+session.getId());
String targetLocation = "C:/Users/arsingh/Desktop/AnupData/DATA/"+session.getId();
System.out.println(targetLocation);
File fs=new File(targetLocation);
boolean bool=fs.mkdirs();
System.out.println(" Folder created :"+bool);
client = new MyInBound(httpServletRequest,targetLocation+"/Output.txt");
clients.put(session.getId(), client);
}
return client;
}
/*public StreamInbound getClient(String sessionId) {
return clients.get(sessionId);
}
public void addClient(String sessionId, StreamInbound streamInBound) {
clients.put(sessionId, streamInBound);
}*/
}
He modificado y anotado el método de esta respuesta . Envía solo un archivo, con un nombre de pila, compuesto por un elemento <canvas> .
if (!(''sendAsBinary'' in XMLHttpRequest.prototype)) {
XMLHttpRequest.prototype.sendAsBinary = function(string) {
var bytes = Array.prototype.map.call(string, function(c) {
return c.charCodeAt(0) & 0xff;
});
this.send(new Uint8Array(bytes).buffer);
};
}
/*
* @description Uploads a file via multipart/form-data, via a Canvas elt
* @param url String: Url to post the data
* @param name String: name of form element
* @param fn String: Name of file
* @param canvas HTMLCanvasElement: The canvas element.
* @param type String: Content-Type, eg image/png
***/
function postCanvasToURL(url, name, fn, canvas, type) {
var data = canvas.toDataURL(type);
data = data.replace(''data:'' + type + '';base64,'', '''');
var xhr = new XMLHttpRequest();
xhr.open(''POST'', url, true);
var boundary = ''ohaiimaboundary'';
xhr.setRequestHeader(
''Content-Type'', ''multipart/form-data; boundary='' + boundary);
xhr.sendAsBinary([
''--'' + boundary,
''Content-Disposition: form-data; name="'' + name + ''"; filename="'' + fn + ''"'',
''Content-Type: '' + type,
'''',
atob(data),
''--'' + boundary + ''--''
].join(''/r/n''));
}