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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