i want to download file from web server and for that I need
1. send request for file path to web service method
2. receive this path on iphone side
3. now convert this path into NSURL
4. and finally send the request to web server for file download
right now i am doing all above but user have to
1. GetURL button and then
2. Download button
I want all this in one button click.
I tried for this too but problem is:
DownlloadButtonClick
{
[self getURL];
[self DownloadFile];
}
getURL{
soapmsg
NSURL
NSURLReuest
...
..
..
}
//after this i was expecting that connection should be done and data(filepath) will be received,
but this not happen
after getURL() method its back to above and call DownloadFile() and then app will crash...
app is crash this is accepted as i know its depend on getURL() method..
now my problem is where should i place getURL() method and DownloadFile() method so i can execute both on one click
thank you in advance
If I've understood your hard to decipher question correctly...
Your problem seems to be that you want to do an asynchronous action - getURL - and then when that has completed, another action. In your DownlloadButtonClick method, you want to think about only calling getURL (and not DownloadFile yet). In whatever code you have for handling the result of getURL (i.e. the URL has been fetched), you can then kick off your DownloadFile action.
Related
I am developing my app with PayPal Marketplace API for the first time.
Among other steps, I need to customize a "PayPal checkout" button. I did this by following instructions on this page.
In function "payment" (see the original code segment below), I supposed to provide a call-back url for CREATE_URL:
// payment() is called when the button is clicked
payment: function() {
// Set up a url on your server to create the payment
var CREATE_URL = '/demo/checkout/api/paypal/order/create/';
// Make a call to your server to set up the payment
return paypal.request.post(CREATE_URL)
.then(function(res) {
return res.id;
});
}
By reading this, I am puzzled why the CREATE_URL value is not a fullpath url starting with "http" or "https"? I have the similar question for EXECUTE_URL in an ensuing segment of the html file.
What type of RequestBody should my REST controller expect?
What action should my app take at the url for "CREATE_URL"? My intuition is to call the Order API to create an order (among other things in my database). Is this correct?
I can address your questions one at a time:
By reading this, I am puzzled why the CREATE_URL value is not a fullpath url starting with "http" or "https"? I have the similar question for EXECUTE_URL in an ensuing segment of the html file.
You don't have to have a full path URL (known as absolute path) because the path that you provide for CREATE_URL is on your own server. So the code where you have your button is on a page like exampleButton.html and when you click the button, it takes you to a script, such as
var CREATE_URL = '/demo/checkout/api/paypal/order/create/';
which is an index page which will run the Create Order API method with the data that you pass. Here is another example implementing a payment button with checkout.js using a server side language.
What type of RequestBody should my REST controller expect?
Your request body will receive the payment data from the JavaScript data parameter, which should be JSON format. You then pass this to the server side when you receive the POST data.
An even simpler implementation is to use the client-side integration to create the order.
What action should my app take at the url for "CREATE_URL"? My intuition is to call the Order API to create an order (among other things in my database). Is this correct?
Your app should automatically run the create order method. This script works with JavaScript promises, so will wait for a response, like getting a successful authorization (or failure) from the customer before attempting to execute the payment.
I'm trying to send some code to a remote server everytime I change a slide on Keynote. Is this possible? Can I add code to be executed on keynote?
Basically, everytime a user changes a slide, it sends a POST request to a server with a string as a parameter.
Thank you!
im currently working on facebook integration into my mobile AS3 game. I'am downloading friends pictures, which works just fine and is not currently an issue. Problem is, i am trying to detect, if user has silhouette (default) picture or his own (is_silhouette property);
Here goes code:
(response[i].id) is valid user id which i have got from previous api comunication
...
HasDefault(response[i].id);
...
private function HasDefault(uid:int):void{
FacebookMobile.api("/"+uid+"/picture", callbackX);
}
private function callbackX(response:Object,fail:Object):void{
if (response != null){
trace(response.url);
trace(response.is_silhouette);
}else{
trace("here goes nothing...");
}
first things first...this code above has 2 issues. First problem is, unless i use absolute URL, facebook does not respond, so API method has actually look like this:
FacebookMobile.api("https://graph.facebook.com/"+uid+"/picture", callbackX);
i dont know why i have to use absolute url here, because anywhere else id/function is good enough...but that is not still main problem.
If i use absolute URL i do get valid response from facebook but according to this https://developers.facebook.com/docs/reference/api/using-pictures/ i should get response.url and response.is_silhouette in my response object. i however recieve only empty response object...I'am starting to be realy desperate.
In addition, i have tried to paste THE SAME request into the https://developers.facebook.com/tools/explorer explorer and surprise surprise...it returns
{
"data": {
"url": "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-frc1/somenumbers.jpg",
"is_silhouette": false
}
}
...which is exactly what i need...but within the application i get only empty response object...
I do not know what you line "FacebookMobile.api("https://graph.facebook.com/"+uid+"/picture", callbackX);" does.
But whatever library that is, stop using it, because its not letting you specify the call you want to make. You can just call the graph api calls yourself using a URLLoader.
So here is the magical thing that is going wrong: You need to be able to append an extra variable when you request the picture: "?redirect=false"
This tells facebook to give you a json response. If you do not have that variable, you will get a redirect to the actual image, which is usually what a person wants anyway.
To see how that works, test out the two links below, one with redirect=false - which you want. and One with it set to true - which you do not.
https://graph.facebook.com/shaverm/picture?redirect=false
https://graph.facebook.com/shaverm/picture?redirect=true
I am pretty sure what is happening is that you are getting the image back instead of the json response describing the image.
My code is for sending Emails to multiple users.User will click on send button,and rpc will be called. Now if user clicks on Cancel button .Ongoing rpc should be cancelled. . Can anyone help ?
I googled a lot, they have introduced the concept of Request Builder. But I am not getting any perfect idea.
Make your async method return a Request instead of void so you can call cancel() on it.
For the same reason, asynchronous methods do not have return types; they generally return void. Should you wish to have more control over the state of a pending request, return Request instead.
— Source: https://developers.google.com/web-toolkit/doc/latest/DevGuideServerCommunication#DevGuideCreatingServices
FYI, you can also use RequestBuilder as the return type, you'll then have to call the send() method by yourself (after possibly customizing the request, e.g. adding headers) to actually make the request to the server.
And of course, if you need to tell the server to abort the processing, you'll have to make another RPC call.
The request is asynch, so the client side can do anything it wants.
All you need to do is add a flag to indicate that the request should be cancelled, and then change the onSuccess method to check the flag and do nothing if it is set.
You should clear the requestCancelled flag each time you make a request - or else after the first request is cancelled, you won't be able to make another one...
e.g.
boolean requestCancelled = false;
void onSuccess(...)
{
if (!requestCancelled) {
// actual response handing code
}
}
If you really want to cancel the request on the server side, it is a lot more complicated. You could do this by sending a second request - one where the fuinctionality is to cancel a request.
To make this work, the "cancel request" has to set a field somewhere the "email request" can read. The "email request" needs to check if the "cancel field" has been set.
// server side Impl
void cancelRequest()
{
// You need to implement this class and ensure it really is a singleton
// and thread safe.
RequestStatusSingleton.setCancelled(true);
}
void serverSideEmailFunc()
{
while(modeEmailAddrs && ! RequestStatusSingleton.getCancelled()) {
// get next address and send email
}
}
Obviously this is a lot of work. Have you considered:
Not having a cancel button on your GUI?
Getting the server to process emails a few at a time (i.e. client sends multiple requests until server tells the client all emails are done).
I totally understand your user. No one wants to wait for 15 seconds.
There is no standard way to "kill" the request, because there is no way to know where your server/datastore is in implementing it. Unless you deal with a process that can be put in a single transaction that can be rolled back, you will have to implement your own logic. For example, if you asked the server to save an entity, you will have to tell the server to save this entity again, but this time without the changes.
Also, think again about your use case. Why a user wants to kill the request? May be he simply wants to go to another place in the app. Then there is no need to kill the request: when the response arrives, check if the user is still in the same place patiently waiting. If not, do not execute onSuccess().
I have a problem getting facebook to call my credits callback script. I've setup a company and the callback url. I used the example script for it. But nonetheless I always get this error when I try to access the payment window using the JS sdk.
var obj = {
method: 'pay',
order_info: order_info,
purchase_type: 'item'
// dev_purchase_params: {'oscif': true}
};
FB.ui(obj, getCashCB);
Error:
There Was a Problem Processing Your Payment
Sorry, but we're having trouble processing your payment. You have not been charged for this transaction. Please try again.
error code from console: 1383046
meaning:
1383046 AppInvalidDecodedResponse The application return value was invalid after json_decoding the return value.
No matter if I'm in sandbox mode, set the callback url to something completely different.
The callback script is never called.
I've searched far and long for anybody else with this problem, but found nothing meaningful. There was something about the server accepting curl requests from facebook but I don't know what that means or how to test for it.
Solved! Whilst looking for the cause I noticed that this error can pop up from a lot of things. But this case is rather specific:
Because the facebook app is still in development, we hid it behind a .htaccess file. So when you visit the site, you login, and the app loads etc. BUT this doesn't work for the credits callback file. Since the request then comes from facebook, it would have to login with user:pass. I tried putting that in the callback URL, but that doesn't seem to work.
So I only need to put the callback file somewhere where you can reach it without .htaccess and Tadaaa it works!
Basically this happens when Facebook doesn't understand the response it gets from calling your payment callback URL. Thew most likely reasons are:
The callback URL is wrong
Facebook gets an error response because the server or some app-level firewall won't let it access the URL (Jon's problem)
Facebook gets an error response because the callback script runs into an exception.
The callback script's response is malformed.