Hi Ramanan,
Few months ago I had to view different pictures within a popup widget, wich
are taken from the server side.
Here is a resume about how I made it (but I am not sure the solution is
very secure) :
imagePopup = new Image();
popup = new PopupPanel();
popup.setWidget(imagePopup);
.....
I discard details about the functionnality with selecting a particular row
into a grid, going from the view side to the presenter side of the MVP
model used with events, etc), but regarding the following line, the picture
is automatically retrieved and vie<ed through the browser :
.....
imagePopup.setUrl(GWT.getHostPageBaseURL() + "photos/photo1.jpg"); //
server side, from root directory of the web site, pictures are putted into
a photos subdirectory
=> when you reset the url with another picture file, rerefresh of the
picture occurs.
=> some people could be right by saying that pictures are not secured but
perhaps it could help you
Regards,
Eddy
Le vendredi 17 juin 2016 12:08:38 UTC+2, Ramanan Nathamuni a écrit :
>
> Hello all,
>
> my requirement is an image getting from server to GWT client.
>
> from the client side, I send a message through AsyncCallBack method and
> the server response Serializable byte[] object. when getting this object,
> I am parsing as String object. but the image could get.
>
> the steps i followed
>
> 1.client side Asynccallback method is
>
> CommandMessage *msg* = new CommandMessage(itemId, *"get-image-data*");
>
> cmain.ivClient.execute(*msg*, new AsyncCallback<ResponseMessage>() {
>
> @Override
> public void onFailure(Throwable caught) {
> //add(new Label("Problem in Getting Map"));
>
> }
>
> @Override
> public void onSuccess(ResponseMessage result) {
>
> here I am getting *result.data* is
> "data:india/png;base64,parsedString"
>
> Image image = new Image(*result.data.toString()*);
>
> canvas.add(image); //
> *but I could not getting Image*
> }
> });
>
>
>
> 2. parsing the byte[] object from serverside
>
> @Override
> public cti.gwtdemo.client.rpc.ResponseMessage
> execute(cti.gwtdemo.client.rpc.CommandMessage commandMessage) throws
> Exception {
> cti.item_system.CommandMessage cmdMsg = CVT(commandMessage);
> cti.gwtdemo.client.rpc.ResponseMessage rsMsg =
> CVT(getItemService().execute(cmdMsg));
>
> * byte[] bytes = (byte[]) rsMsg.data; String base64 =
> com.google.gwt.user.server.Base64Utils.toBase64(bytes); **//here
> converting process*
> String[] s = rsMsg.args[0].split(" ");
> s[0] = s[0].replace(".", "/"); *// the string s[0]
> contains image name with type ie india.png and i replaced as india/png *
>
> rsMsg.data="data:"+s[0]+";base64,"+base64;
> *
> //"data:images/png;base64," + base64;* ---------------------> *Actually I
> stuck here.* ( As per mentioned in
> http://gurselkoca.blogspot.in/2010/12/construction-of-gwt-image-from-byte.html
>
> )
>
> (in rsMsg.data now contains ......... "data:india/png;base64,
> parsedString")
>
> return rsMsg;
> }
>
> protected cti.item_system.CommandMessage
> CVT(cti.gwtdemo.client.rpc.CommandMessage
> cm) {
>
> return new cti.item_system.CommandMessage(cm.itemId, cm.command,
> cm.args, cm.data); //Server Side data
> }
>
> protected cti.gwtdemo.client.rpc.ResponseMessage
> CVT(cti.item_system.ResponseMessage
> rm) {
>
> return new cti.gwtdemo.client.rpc.ResponseMessage(rm.command,
> rm.itemId, rm.result, rm.args, rm.data); //after getting data it set to
> client side
> }
>
> please Help me, and what stands for
>
> *"data:images/png;base64," + base64; *Thanks in Advance
> Ramanan
>
>
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