In my chatting application, I'm using Parse for a user table, getting ID's, images, etc. I recently added this functionality, and I have encountered a problem. When I send a message, I create an NSDictionary with information about the message such as time, message, sender, sender objectId, etc. But, when I try to add the PFFile (image file) associated with the user, I get an error saying that PFFile cannot be converted to JSON (PubNub message format). How can I add PFFile as part of the NSDictionary used in the message to be compatible with JSON, or there might be another way.
I'm not familiar with asynchronous tasks, but in my code, I have a method - (NSDictionary *)parseMessageToDisplay:(NSDictionary *)message {} where the input would be message received from PubNub, and it would return a format better united to be displayed in a UITableView. If I added the ID of the file or user to my dictionary, how could I get my image in UIImage or NSData, and return it from my method in an NSDictionary. Sorry if this post seems long, just trying to provide a lot of information.
In order to use parse.com, PFFile in particular, you'll probably want that NSDictionary to be a PFObject instead. A PFFile reference can be saved as an attribute of a PFObject -- in fact that's the only way it can be saved.
Thanks to #danh for this suggestion, but you really saved me. Apparently Parse creates a URL for all PFFiles and I can just send that URL (NSString *) with my NSDictionary to PubNub, and then in my - (NSDictionary *)parseMessageToDisplay:(NSDictionary *)message method just use [NSData dataWithContentsOfURL:[NSURL URLWithString:imageURLString]]; and get data from that. YAY! No long running confusing asynchronous tasks to made my day terrible!
Related
The following is a test method for communicating between the watchOS and iOS components of my app:
- (void)session:(WCSession *)session didReceiveMessage:(NSDictionary<NSString *,id> *)message replyHandler:(void (^)(NSDictionary<NSString *,id> * _Nonnull))replyHandler {
NSArray *responseArray = #[#"hello", "world"];
NSDictionary *responseDict = #{#"response": responseArray};
replyHandler(response);
}
This works perfectly - in the reply handler on the watch I can log the contents of responseDict and see the objects #"hello" and #"world". However, if I change responseArray to contain NSManagedObject instances (for sending actual data to the watch), the sendMessage error handler is triggered with an error saying Payload could not be delivered. Before I change my database structure to include a uuid for the entities I need to send (so I can send them represented by their UUID in NSString format), I just wanted to check: is it actually possible to send NSManagedObject instances to watchOS?
No, it's not possible to send NSManagedObject instances between contexts, threads, or devices.
A managed object only exists within its managed object context. Its data would be nil, if you tried to access or copy it outside its context.
If your Core Data persistent store is on the phone, but you want to display a managed object's data on the watch, you'd first to move the data from the managed object into another type (e.g., a dictionary), and then send that data to the watch.
See this answer for more details.
I want to send a PFObject directly over a push notification. I send the Parse object directly inside the push (e.g. with a custom key "arg") but I couldn't figure out how to construct a real PFObject from the received data. Received data is (obviously) an NSDictionary, with all the keys (object ID, created at, ACLs etc) available. How do I convert it to a PFObject instance?
I need a real way to construct a PFObject with the available data, so don't come with obvious solutions like "send the object ID and then fetch that object at client with Parse's methods." etc. I already know that obvious solution, but it's time/bandwidth/quota inefficient as it requires a new query, while I can have everything I need in that query anyway.
I'm looking for an automatic way, if any. I am targeting iOS 8 so maximum push payload size is also not an issue (2KB is more than enough for my case).
UPDATE: I've tried [PFObject objectWithClassName:#"MyClassName" dictionary:receivedDictionaryObject]; but no avail. It just does not work, the fields are nil even though the dictionary has all the data directly from Parse itself.
I think you can use something like this
+ (PFObject *)objectFromDictionary:(NSDictionary *)dictionaryFromPush{
PFObject *theObject = [[PFObject alloc] initWithClassName:#"MyClassName"];
for( NSString *keys in [dictionaryFromPush allKeys] )
{
[theObject setObject:[dictionaryFromPush objectForKey:keys] forKey:keys];
}
return theObject;
}
This is an untested code but im pretty sure will give you and idea of my point, to get the NSDcitionary from the Push and sent it to this method to be able to convert it to a PFObject
Hope this help
I have a program that retrieves data from a link and i write it out to the Log like this.
NSURL *getURL=[NSURL URLWithString:#"link.php"];
NSError *error=nil;
NSString *str=[NSString stringWithContentsofURL:getURL encoding:NSUTF8StringEncoding error:&error];
NSLog(#"%",str);
This prints to the log the three values from my php as expected.
However I am having a little difficulty saving this in an array which then displays it those values in a UISplitviewController (the leftcontroller side).
which is written like this
showArray=[[NSMutableArray alloc]initWithContentofURL:getURL];
then in cellForRowAtIndexPath: method is
cell.textLabel.text=[showArray object atIndex:indexPath.row];
A second thing i have tried is write myURL to an array and tried to initlize showArray with ContentsofArray like this
NSArray *retults=[NSArray arraywithContentsOFURL:getURL];
showArray=[[NSArray alloc]initWithArray:retults];
but THAT dont work
BUT if i say
showArray=[[NSMutableArray alloc]initWithObjects:#"One",#"Two",nil];
One and two shows in my leftview controller....
Would love is someone could help me with this...Thank you
Are you trying to add the contents of the URL or the URL itself ?
If you are trying to just add the URL, then use :
showArray = [#[getURL] mutableCopy];
However, if you are trying to add the contents of the URL, then the doc clearly states that the URL must represent a string representation of an array.
Furthermore :
Returns nil if the location can’t be opened or if the contents of the location can’t be parsed into an array.
EDIT :
I saw your comment on your post and your data looks like JSON data.
You should take a look at the NSJSONSerialisation class which is pretty straightforward to use (you'll find lots of example here on SO).
U have done web services perfectly, now wat u have to do is parse it to an array
First download the SBJSON files in this link
https://github.com/stig/json-framework/
Then, copy them to your workspace.
Then, in the viewController add this
#import "SBJson.h"
Your JSON data contains values in the form of dictionary
SO, to parse them
SBJsonParser * parser=[SBJsonParser new];
NSDictionary * jsonData=(NSDictionary *)[parser objectWithString:outputData];
NSArray * arr=(NSArray *)[NSDictionary objectForKey:#"animal"];
I think this will help
I want to implement a web service to recover an array of my entity PictureCaptures :
PictureCaptures
---------------
- description : string
- captureDate : DateTime
- photoBinary : byte[]
The web service will be mainly called by an iOS application.
What's the best way to implement it, because of the byte array attribute?
Am I suppose to return the byte array without any transformation, as a simple JSON attribute? If yes, how to interpet the JSON response ? -In this case JSONObjectWithData:options:error: doesn't work, too much data and memory issue)-
Thank you for your help.
I would suggest you add two resources: one for the meta data (description, captureDate and so on) and one for the binary data. Let the meta data resource contain a link to the binary photo data.
Like this:
GET /images/1234
Response:
{
description: "Nice photo",
captureDate: "2012-04-23T18:25:43.511Z",
photoData: "http://example.org/images/1234/photo"
}
and http://example.org/images/1234/photo returns the raw photo data
(see also See also The "right" JSON date format for a discussion on date formats).
when you get JSON responce you shoud convert the btye array to NSData.
first add Base64.h and m file to the project ( you can find it easily on internet)
then import Base64.h
from your JSON data
NSString *data= [yourJSONDict objectForKey:#"photoBinary"];
NSData* imageData = [data base64DecodedData];
UIImage *imag=[UIImage imageWithData:imageData];
[yourImageView setImage:imag];
this might help you.
On my server I have a table that I want to get over to IOS sqllite table.
My server table has a field called data which is of type Image. The way I populated the field is that I wrote a C# app that converts an image to byte array and then write this byte array to sql Image column.
In IOS, I make a soap request to my wcf service and get all data from my table. I made sure data is received. My problem is writing received image data to my entity's binary data field. I use the following code for that.
NSString *key = (NSString *) [keys objectAtIndex:i]; // I made sure key is valid
NSData *data = (NSData *) [rowData GetValue:key]; // I made sure data is retrieved
[tblRow setValue:data forKey:key]; // After calling this, data for the key is nil.
Portion of Image Data Content
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
I am not the one writing the WCF Service that sends me the image data and I learned that the service applies base 64 encoding to the data and setting base 64 string to NSData object and trying to save it was failing. Once I decoded the data, everything worked fine.