I need to post two pieces of data at the same time to a WEB server
One piece is image data contined in a UIImage and the other is audio data contained in a caf file.
I am asking for an example showing how to post this data.
You need to use NSURLConnection. That takes an NSURLRequest as a parameter. There’s also a descending class called NSMutableURLRequest where you can set the request body and method.
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:…];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:/* NSData */];
NSURLConnection *connection = [NSURLConnection
connectionWithRequest:request delegate:…];
[connection doSomething];
There are already questions on Stack Overflow on getting NSData representation of an UIImage, see the UIImageJPEGRepresentation function for example.
Related
I want to send a new object created on iOS to a receiving server with a POST method using JSON data type. From what I know about receiving data from the server in iOS, is that all JSON handling was simplified by Apple with the introduction of iOS 8. But in contradistinction to GETting JSON objects, POSTing those isn't really described anywhere I could find ...
The first steps I took to try and solve the problem looked as follows:
How can I send the below format to server???
{"createFrom":"","createType":"","filename":"AC","filter":"","lstData":[{"FieldName":"LNK_RELATED_CN","FieldValue":""},{"FieldName":"LNK_RELATED_CO","FieldValue":""},{"FieldName":"MLS_PURPOSE","FieldValue":"Inquiry"},{"FieldName":"MLS_STATUS","FieldValue":"Open"},{"FieldName":"MMO_NOTES","FieldValue":""},{"FieldName":"DTE_NEXTACTIONDATE","FieldValue":""},{"FieldName":"MMO_NEXTACTION","FieldValue":""}],"password":"Infodat2","username":"manmeets","IsNew":true}
I have seen code like this:
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
NSURL * url = [NSURL URLWithString:[NSString stringWithFormat:#"%#AssetSave",[defaults objectForKey:#"siteAddress"]]];
[request setURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setHTTPBody:jsonData];
_responseData = [NSMutableData data];
NSLog(#"request : %#", request);
_nsurlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
But I really don't know how to send a JSON object to a server using a POST method at all. Could anybody please help me out?
The code you have is fine, you just need to create jsonData:
jsonData = [NSJSONSerialization dataWithJSONObject:dict options:0 error:nil];
(thought you should really also include an &error so you can see what's happening if something goes wrong)
I am building a JSON post in objective-c and sending it to an ASP.NET MVC controller.
I am building the NSMutableURLRequest as follows:
request = [[NSMutableURLRequest alloc] initWithURL:url];
NSString* jsonRequest = [NSString stringWithFormat: #"{\"collection\":\"images\",\"id\":\"%#\",\"objectjson\":%#}",response.id,response.json];
NSData *requestData = [NSData dataWithBytes:[jsonRequest UTF8String] length:[jsonRequest length]];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:[NSString stringWithFormat:#"%d", [requestData length]] forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody: requestData];
I then send the request as follows:
NSOperationQueue *backgroundQueue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:request queue:backgroundQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
{ ... completion code goes here
This works well most of the time. However, for very large JSON strings I occasionally get a web service error where the web service reports that it is encountering an End of File marker within the JSON. It appears that the JSON is being truncated.
I am sending the JSON to an ASP.NET MVC controller.
Does anyone have any words of wisdom on what might be happening? Are there any ASP.NET web configuration settings that perhaps I need to adjust to prevent this issue occurring.
One thing I don't understand is why it is such an intermittent problem.
This seems to be a result of bytes being lost over 3G or EDGE connection. The best idea I can come up with is to detect on the server that the content length header is larger than the request POST body and to return a status code that tells the client to try again. The client could pass a retry count on the url and the server could read it and if it's a certain value, the server would return an error code indicating that a retry should not be attempted. Ugly I know but I can't think of a better way. This is what I am going to do for my photo uploading app.
Good luck!
the problem is in the conversion to NSData
try this
NSData *requestData = [jsonRequest dataUsingEncoding:NSUTF8StringEncoding];
We are trying to add in functionality into our app to allow it to POST a large file approx 50kb to our web service the file itself is a HTML template, however with the code below what we are finding is that the data seems to get cut off when the web service saves it.
The web service is currently designed to check the $_POST['html'] variable and write it to a file.
Is there a better way to do this and does anyone have any idea why the upload is not complete?
Thanks Aaron
NSString *myText;
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"template" ofType:#"htm"];
if (filePath) {
myText = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
}
NSURL *URL = [NSURL URLWithString:#"http://mywebsiteurl.com/receiveData.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
request.HTTPMethod = #"POST";
NSString *params = [NSString stringWithFormat:#"html=%#", myText];
NSData *data = [params dataUsingEncoding:NSASCIIStringEncoding];
[request addValue:#"8bit" forHTTPHeaderField:#"Content-Transfer-Encoding"];
[request addValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request addValue:[NSString stringWithFormat:#"%i", [data length]] forHTTPHeaderField:#"Content-Length"];
[NSURLConnection connectionWithRequest:[request autorelease] delegate:self];
I think it is because your Server set the post limit.Check the settings at your server side about the post data limit.
When I rechecked this question, I think maybe I found what was the problem. When I do HTTP post, I usually don't set the content-length by myself. I just encode my post data as key=value&.. form and use the [NSMutableURLRequest setHTTPBody:data] method to add the data to the NSMutableURLRequest. I think it will do the rest for you include set the content-length for you. Even though I am not very familiar with HTTP protocol, but I think maybe the content-length represent the whole post data length, but here you set the content-length value with the length of key value data length.
I've got a problem with my objective c code. I have a API-key protected WCF API that I built that takes POST requests and writes them to a Java servlet with C#. Anyway, this works great when testing with Fiddler, not so good from objective C. When I try to run the POST from my objective C, it "acts" like the NSURLMutableRequest is looking for a GET, in that the response only returns some default code I have written in for the GET method. Does anybody know why this is, and, moreover, what I can do to fix it? Here is the code that I use (quite successfully) to make other POST requests in with objective C.
is the problem the fact that I specify the API key in the URL for the NSMutableRequest? That's the only thing I can figure.
Here is the code:
NSString* theMessage = [NSString stringWithFormat:#"<MyRequestObject xmlns='http://schemas.datacontract.org/2004/07/MyService'></MyRequestObject>"];
NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:POST_API_URL]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:240.0];
[theRequest setHTTPMethod:#"POST"];
[theRequest setValue:#"text/xml" forHTTPHeaderField:#"Content-Type"];
[theRequest setHTTPBody:[theMessage dataUsingEncoding:NSUTF8StringEncoding]];
NSString *msgLength = [NSString stringWithFormat:#"%d", [theMessage length]];
[theRequest addValue: msgLength forHTTPHeaderField:#"Content-Length"];
NSURLResponse* response;
NSError *error;
NSData* result = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&response error:&error];
I ended up using ASIHTTPRequest to run the POST request to the WCF REST service, and now everything seems to be running smoothly. This means that there's probably some sort of URL Encoding mechanism for the API key that's going on behind the scenes that was poorly documented for NSMutableURLRequest, who knows. The good thing is, I've got the issue fixed. Here is the code I used:
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:POST_API_URL]];
[request appendPostData:[[NSString stringWithFormat:#"<MyRequest xmlns='http://schemas.datacontract.org/2004/07/MyService'>all of my request params in here</MyRequest>"] dataUsingEncoding:NSUTF8StringEncoding]];
[request setRequestMethod:#"POST"];
[request addRequestHeader:#"Content-Type" value:#"text/xml"];
[request startSynchronous];
Did you try setting the Content-Length header? WCF/IIS might be ignoring the body if it doesn't have its length defined in as a header.
I am successfully using the json-framework to do GET HttpRequests. Does anyone have code to prepare a json object and do a POST HTTP Request? If so, can you please share some sample objective-c code. Thanks
Take a look at this open source project hosted at google code.
Description:
This framework implements a strict JSON parser and generator in Objective-C.
Download the framework, embed it in your application, and import the JSON.h header. You're now ready to make your application speak JSON. The framework adds categories to existing Objective-C objects for a super-simple interface, and provides classes with more flexible APIs for added control.
Try TwitterHelper.m in Stanford's CS 193P "Presence3Files.zip" package.
I would post the code directly but am unsure if that is cool, license-wise.
USe following code for making a Post Request using JSON Data Object.
self.responseData=[NSMutableData data];
NSURL *url = [NSURL URLWithString:#"http://dev.iworklab.com/myProject/index.php"];
NSString *jsonRequest = [NSString stringWithFormat:#"{\"method\":\"changePassword\",\"customer_id\":\"%#\",\"old_password\":\"%#\",\"new_password\":\"%#\",\"con_password\":\"%#\"}",customerID,oldPasswordText.text,newPasswordText.text,confirmPasswordText.text];
jsonRequest = [NSString stringWithFormat:#"&json_data=%#",jsonRequest];
NSData *json_data = [NSData dataWithBytes:[jsonRequest UTF8String] length:[jsonRequest length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
[request setHTTPMethod:#"POST"];
[request setHTTPBody: json_data];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setValue:[NSString stringWithFormat:#"%d", [json_data length]] forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody:[[jsonRequest stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]
dataUsingEncoding:NSUTF8StringEncoding
allowLossyConversion:YES]];
passwordConnection = [NSURLConnection connectionWithRequest:request delegate:self];