My problem is the following...
I read about sending http requests and receiving their responses on iPhone SDK 3.2 using NSURLRequest and NSHTTPURLResponse (All my requests are "get" and there's no "post") but I don't know how to do that exactly cause some of my responses are just strings (plain text) and some others are binary files (gzip and mp3)
Thank you in advance for the help
To perform a Http request, I use ASIHttpRequest:
NSURL *url = [NSURL URLWithString:my_url];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setRequestMethod:#"GET"];
[request startSynchronous];
That works perfectly. Still need to figure out if it's fine with mp3 / zip files.
Luc
Related
Hello I am trying to parse Shoutcast radio's metadata in iOS.
After trying many submitted solutions, I end up with a piece of code that is still giving me error
Response String: ICY 404 Resource Not Found
icy-notice1:SHOUTcast Distributed Network Audio Server/Linux v1.9.8
icy-notice2:The resource requested was not found
the code im trying to parse metadata
NSURL *url = [NSURL URLWithString:#"http://relay.181.fm:8052/7.html"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0];
[request addValue:#"1" forHTTPHeaderField:#"icy-metadata"];
[request addValue:#"Winamp 5/3" forHTTPHeaderField:#"User-Agent"];
[request addValue:#"audio/mpeg" forHTTPHeaderField:#"Content-Type"];
[request setHTTPMethod:#"GET"];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString* responseString = [[NSString alloc] initWithData:data encoding: NSUTF8StringEncoding];
NSLog(#"Response String: %#", responseString);
any ideas about problem, thanks for helping
Not all SHOUTcast servers allow access to 7.html. There are two other ways to get that data.
The XML data for SHOUTcast is generally available, but requires the server's password. You can request it using /admin.cgi?mode=viewxml&page=4.
You can also read the metadata right out of the stream. This is more cumbersome, but entirely possible, and not too difficult. See this answer for details: https://stackoverflow.com/a/4914538/362536
I found a solution for those who can't/doesn't want to read metadata from stream.
Its the easiest solution I have seen.
http://www.fvalente.org/blog/2012/03/15/shoutcast-metadata-the-easy-way/
Brad says in the post above
Not all SHOUTcast servers allow access to 7.html.
so it is better to check if the server you want to get metadata has /7.html page
the current song is also displayed on the page /played.html but it works in a web browser along with /7.html. But when i tried in fiddler2 on a windows machine i got the ICY 404 resource not found error
When do I actually get my response code 200 for a valid request for an image? Is it after all of the data has been downloaded to my browser or which ever device is requesting the image?
I am using the library http://allseeing-i.com/ASIHTTPRequest/ to download images in my iPad app and using the download directly to a file option and then deleting the file if it was a 404 error or any other status code than 200.
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDownloadDestinationPath:#"/Users/ben/Desktop/my_file.jpg"];
Problem is partial responses seem to be getting saved during slow connections so I end up with blank or corrupt images.
I decided instead to save the data stream to disk only after I received a status code of 200:
NSURL *url = [NSURL URLWithString: [[NSString stringWithFormat:kProductImagesURL, fileName] stringByAppendingString:tStamp]];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setTimeOutSeconds:10];
[request startSynchronous];
int statusCode = [request responseStatusCode];
if (statusCode==200) {
NSData *responseData = [request responseData];
[responseData writeToFile:[savePath stringByReplacingOccurrencesOfString:#"%20" withString:#" "] atomically:YES];
}
I just want to make sure that the response code only comes back after the request has been completed and all of the data has been downloaded. I am 99% sure that is the case but can't afford another app release with an image bug like this in it.
There are two reasons you should probably consider switching to an asynchronous request. The first is, it frees up your main thread to interact with the user (even a modal spinner would be nice--otherwise it looks like your app has frozen).
Second, it gives you callbacks that only happen once the whole request is finished. I can't really explain only having gotten partial data with the code you showed, but I've never once had that problem using ASI's asynchronous methods.
How to use post manner to transmit username and password in order to log in a website on iphone or ipad platform?
Some one has suggest me that use ASIHTTPRequest,but I don't know how to use it．
Can somebody help me ?Thank you ........
ASIHTTPRequest has one of the best how to use pages of any library I have ever encountered. It is located here: http://allseeing-i.com/ASIHTTPRequest/How-to-use
If you need to post to a web form you could do something like this:
#define kURLString #"https://yourwebsite.com"
NSURL *url = [NSURL urlWithString:kURLString];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue:#"myname" forKey:#"username"];
[request setPostValue:#"l33td00d" forKey:#"password"];
[request setDelegate:self];
[request startSynchronous];
Although in real life you may wish to run the request asynchronous. The details on how to do that are on the page I linked. It is defiantly worth reading.
I am a backend Rails developer of an API that services several iPhone clients. I'm not an iPhone dev.
I have a need to accept binary data (several image files in this case) from the client via a POST request to the API.
To get the file content (file metadata other than image type is not relevant here), what tools might be used by the iPhone developer? I've found ObjectiveResource (used by iPhone on Rails) and ASIHTTPRequest. In the pages I found for those, there's no indication of what form the uploaded file will have when the controller action is executed. Will it be a Ruby File object or Tempfile object? I don't control the iPhone code development, there are some cross-cultural communication difficulties there, and they haven't used those suggestions so far. If I can submit better information to them, I might be getting better data back.
The backend app is currently running Rails 2.3.10, and will soon (in the next few weeks) likely be converted into Rails 3.
Thanks,
Craig
ObjectiveResource does not natively support file uploads. Try instead using ASIHTTPRequest with this snippet:
NSURL *url = [NSURL URLWithString:#"http://localhost:3000/file"];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue:#"Sample" forKey:#"name"];
[request setFile:... forKey:#"file"];
[request startSynchronous];
For more details, see the example page here (sending data).
The post will be encoded as a standard multipart form post (just like if it came from an HTML form). If you are using paperclip to store your uploads, the magic will just happen!
Use JSON over HTTP
NSMutableURLRequest *request =
[[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:urlStr]];
[request setHTTPMethod: #"POST"];
[request setValue:#"application/json; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
NSString* requestDataLengthString = [[NSString alloc] initWithFormat:#"%d", [jsonMessageStr length]];
[request setValue:requestDataLengthString forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setHTTPBody:jsonData];
NSURLConnection *theConnection =
[[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
I'm trying to make a log in or sign up feature for my web site in my iPhone app. My website is a content management system, and like any other CMS, it has log in and registration features. It also has permmissions, dependent on the user account. I think I would have to use UIWebView for this.
Are there any examples or tutorials I can examine?
Check out the documentation for NSURLRequest (and NSMutableURLRequest): you can use it to make a POST request to your login and registration pages, just like a web browser. You can write the form UI in Cocoa/Objective-C and then send the data to the server.
As far as displaying the result to the user, you'll have to figure out a way to either parse the returned HTML (bad idea) or modify your CMS to return JSON or XML to iPhone requests (better idea).
Edit: Here's some sample code, taken from an app I'm working on (it submits data to Last.fm using POST):
NSURL *url = [NSURL URLWithString:#"http://example.com/"];
NSString *str = #"This is my example data!";
// everything below here is directly from my app:
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:[str dataUsingEncoding:NSUTF8StringEncoding]];
[request setValue:kLastFMClientUserAgent forHTTPHeaderField:#"User-Agent"];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];
[request setHTTPShouldHandleCookies:NO];
*connection = [[NSURLConnection alloc] initWithRequest:request
delegate:self
startImmediately:YES];