I'm trying to show an image on a html page, I received the image from the android client (base64), now I want to make it appears on a html page.
This is the code of the reception, I don't know what is the next step.
socket.on("image", function (image) { //réception d'une image
console.log(" image réçu : " +image)
//use fs.writeFile
image = image.replace(/^data:image\/png;base64,/, "");
require("fs").writeFile("out.png", image, 'base64',function(err) {
console.log(err);
});
});
As you said this is server side, What you can do is, emit the base64 code as it is to the web client. And on the web client, use JavaScript to replace the src attribute of the image div where you are planning to display the image.
Client side sample code below:
Socket.on("image", function(){
document.getElementById('img').setAttribute( 'src', 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==' );
}
This shold work, in the place of the dummy base64 that I used, you can use yours.
Related
I have a rest server hosted in Amazon written in Delphi with a method returning a jpg Stream image.
I need download the image and show in webview.
The method Rest Server method is something as:
//delphi code
function TSrvServerMetodos.ImagePac(pront:integer): TStream;
var blob:TStream;
begin
...
Result := CreateBlobStream(fieldbyname('PHOTO'),bmRead);
end;
where the Result is a jpeg Stream with a image.
To access the remote rest method I am trying to use the next:
String url = Common.getServerUrl() +"/"+ "\"ImagePac\"";
String URL=url+"/"+"23";
webView.loadUrl(URL);
But no Image is showing in webview.
My image is comming from a rest server and no a website. I have no way to call something as webview.loadUrl("http://www.myserver.com/myimage.jpg");
Is possible load that image with webview?
Regards, Luiz
Yes, It is. To solve the problem I had to save the image to sdcard and create a html string to load the image with webview.
For the new offspring with the same trouble. Just encode image in base64 and place it in src attribute of img tag
My project is a web based app and loaded by android webview.
I want to call camera by clicking one button on my web page, then catch image back and set back into web page.
Currently I use MediaStore.ACTION_IMAGE_CAPTURE to catch a picture by camera. And then convert the image to base64 string (myImgStr). These steps are fine.
But when I use webview.LoadUrl("javascript:handleCameraResult('+ myImgStr +')") to send image string back into web page, there is null in web page.
Do you guys know what the issue is and how to fix it?
Thanks!
Finally I've got the answer. That is:
Base64 string received by MediaStore.ACTION_IMAGE_CAPTURE contains some "\n" which block the entire string inserted through javascript call.
My solution is to remove those "\n" then call wevview.LoadUrl. Everything works well now.
I am trying to upload a file from andriod application, using Jquery to node.js using express..
My client side code is:
function uploadData(win) {
var padI = imagedata.length-1
while( '=' == imagedata[padI] ) {
padI--
}
var padding = imagedata.length - padI - 1
var user = load('user')
$.ajax({
url:'http://'+server+'/lifestream/api/user/'+user.username+'/upload',
type:'POST',
contentType: false,
processdata:false,
data:imagedata,
success:win,
error:function(err){
showalert('Upload','Could not upload picture.')
},
})
}
I have used post form without any content type because if i use multipart/form-data it says error about boundary ..
my server side code using node.js is:
function upload(req,res) {
var picid=uuid()
console.log('Got here..' + __dirname)
//console.log('Image file is here ' + req.files.file.path)
// console.log('local name: ' + req.files.file.name)
var serverPath = __dirname+'/images/' + picid+'.jpg'
fs.rename(
req.files.file.path,
serverPath,
function(error) {
if (error) {
console.log('Error '+error)
res.contentType('text/plain')
res.send(JSON.stringify({error: 'Something went wrong saving to server'}))
return;
}
// delete the /tmp/xxxxxxxxx file created during download
fs.unlink(req.files.file.path, function() { })
res.send(picid)
}
)
}
when the file comes to server, it gives an error of res.files.file is undefined ..
I have searched alot of forums, they say that res.files.file is only access when contenttype is multipart/form-data but then the boundary problem occurs
Any help on that is highly appreciated
Boundary is a special sequence of characters that separates your binary data.
You should submit MIME type as multipart/form-data, as well as set your imagedata to FormData() type (from your snippet it's not clear if it is FormData type).
Here are similar issues and solutions:
How to set a boundary on a multipart/form-data request while using jquery ajax FormData() with multiple files
jQuery AJAX 'multipart/form-data' Not Sending Data?
A great alternative to writing this code is to use filepicker.io This allows you to connect to yoru own s3 bucket. When the file is saved, you get back a callback with the S3 url, you can then simply pass that url to your node api, and save it. I have used this to avoid having to write extra server code for handling file uploads. Extra bonus, if you need to do this with images, and want users to be able to edit the images, you can use Aviary which allows an image to be edited locally, and you then get back another s3 url, that you can then save to your server..
I used graph API Json Response of Facebook Wall Post Images and display in my APP i successfully got it. But the wall images look very Blur how to resolve? i used this code for get wall picture
URL url=new URL(hashMap.get("picture_url"));
bitmap=BitmapFactory.decodeStream(url.openConnection().getInputStream());
((ImageView)view.findViewById(R.id.imageView_FullImage)).setImageBitmap(bitmap)
The Facebook Graph API as well as the FQL data set always returns the Picture URL of a thumbnail. If you look at the URL it returns, it will have one of these ending (right before the image extension .jpg, .png, etc) _t., _a.. For example, if the URL is to a JPG file, it could have an ending _t.jpg
The idea is to swap the ending and choose a normal size for the image that is returned. To do this, use the code below that will replace the endings with the one for normal sized images (that should have the _n.)
By the way, I don't think the tag you are looking for is picture_url. It should be just picture. But regardless, get the source URL as shown below, replace the endings and then pass it to the this line in your code:
// THIS SHOULD BE AFTER THE if....else code block
bitmap=BitmapFactory.decodeStream(url.openConnection().getInputStream());
CODE TO REPLACE THE VARIOUS THUMBNAIL IMAGES: By the way, this is production code and works perfect.
String PICTURE_URL;
String getPicture = JOFeeds.getString("picture");
if (getPicture.contains("_t.")) {
PICTURE_URL = getPicture.replaceAll("_t.", "_n.");
} else if (getPicture.contains("_a.")) {
PICTURE_URL = getPicture.replaceAll("_a.", "_n.");
} else if (getPicture.contains("_s.")) {
PICTURE_URL = getPicture.replaceAll("_s.", "_n.");
} else if (getPicture.contains("_q.")) {
PICTURE_URL = getPicture.replaceAll("_q.", "_n.");
}
Note: However, in some cases, like a Video preview or a Link preview, it will not always have a bigger image available. Nothing much you can do about it nor can Facebook I suspect. These typically come from posts that are shared by users from other websites.
In a phonegap-android application i want to open an external link within the application.
For this i used a plugin childBrowser and it works fine.
But the external link is taking time to load for which i want to show a wait/loading message.
I also tried to open the external link through ajax-call, updating the div with the response page. and until reponse is not received i am showing a loading message but the problem with this approach is that page loses its styles and other structure.
I guess this is because i am putting entire external page inside the div tag which cannot render the entire page as the browser can do it.
Code snippet looks like-
<script type="text/javascript">
function loadPage(url) {
var xmlhttp = new XMLHttpRequest();
// Callback function when XMLHttpRequest is ready
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState === 4){
if (xmlhttp.status === 200) {
document.getElementById('container').innerHTML = xmlhttp.responseText;
}
}
};
xmlhttp.open("GET", url , true);
xmlhttp.send();
}
</script>
How can i achieve this, can I override childBrowser?
Also
if i want to open the page in applications' web view then how can i achieve the same for web-view.
EDIT: As per Same origin policy one cannot call to a outside domain using xhr request.
Okay understood. i checked in browser and got expected error: 'XMLHttpRequest cannot load'
But then how does it shows/opens the url in mobile?
Ofcourse the page is not fully functional and thats my original issue.
i would post this as a separate question, but its related to my original question
Thanx.
Any hints/suggestions would be great.