I am trying to use an NSOperation started from another NSOperation
This is the inner most NSOperation:
#pragma mark - OVERRIDE
- (void)main
{
#autoreleasepool {
if (self.isCancelled) {
return;
}
NSURL *url = [NSURL URLWithString:self.urlStr];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
self.urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}
}
#pragma mark - NSURLConnectionDataDelegate
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// NEVER CALLED
if (self.isCancelled) {
[connection cancel];
self.receivedData = nil;
return;
}
[self.receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{// NEVER CALLED
if (self.isCancelled) {
self.receivedData = nil;
return;
}
// return data to the delegate
}
The problem is that although the main method gets called the didReceiveData neverGetsCalled.
I start this operation here:
- (void)main
{
#autoreleasepool {
if (self.isCancelled) {
return;
}
NSOperationGetJSONFromWeb *webGetOp = [[NSOperationGetJSONFromWeb alloc] initWithURLString:self.urlStr andDelegate:self];
[self.opQueue addOperation:webGetOp];
}
}
This is from another NSOperation obviously.
What is the problem here?
If I call this operation directly (not from another operation) everything works fine.
Use KVO flag like
#pragma mark - OVERRIDE
- (void)main
{
#autoreleasepool {
if (self.isCancelled) {
return;
}
NSURL *url = [NSURL URLWithString:self.urlStr];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self willChangeValueForKey:#"isExecuting"];
self.urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
executing = YES;
[self didChangeValueForKey:#"isExecuting"];
}
}
#pragma mark - NSURLConnectionDataDelegate
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// NEVER CALLED
if (self.isCancelled) {
[connection cancel];
self.receivedData = nil;
return;
}
[self.receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{// NEVER CALLED
[self willChangeValueForKey:#"isFinished"];
[self willChangeValueForKey:#"isExecuting"];
executing = NO;
finished = YES;
[self didChangeValueForKey:#"isExecuting"];
[self didChangeValueForKey:#"isFinished"];
if (self.isCancelled) {
self.receivedData = nil;
return;
}
// return data to the delegate
}
Related
I have a custom NSURLProtocol ("UrlProtocol") written to intercept requests from a UIWebView when navigating to specific websites, and apply an extra HTTP header before being sent. I followed https://www.raywenderlich.com/59982/nsurlprotocol-tutorial for a working class. My problem comes with switching from the deprecated NSURLConnection to NSURLSession: I tested an extremely simple one-file html page, which loaded successfully. However, slightly more complex sites with resources like js files, images, etc. will timeout, whereas using NSURLConnection the entire site will load within a few seconds.
I'll paste the original UrlProtocol using NSURLConnection, then the new class using NSURLSession. The original:
#import "UrlProtocol.h"
#import "Globals.h"
#implementation UrlProtocol
+ (BOOL)canInitWithRequest:(NSURLRequest *)request {
if (![request.URL.absoluteString hasPrefix:#"http"]) return NO; //No need to intercept non-http requests
if ([NSURLProtocol propertyForKey:#"handled" inRequest:request]) {
return NO;
}
return YES;
}
+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
NSString* key = #"custom-auth-header";
Globals* globals = [Globals getInstance];
NSString* token = [globals token];
NSMutableURLRequest *newRequest = [request mutableCopy]; //Create a mutable copy that can be modified
[newRequest setValue:token forHTTPHeaderField:key];
return [newRequest copy]; //return a non-mutable copy
}
+ (BOOL)requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b {
return [super requestIsCacheEquivalent:a toRequest:b];
}
- (void)startLoading {
NSMutableURLRequest *newRequest = [self.request mutableCopy];
[NSURLProtocol setProperty:#YES forKey:#"handled" inRequest:newRequest];
self.connection = [NSURLConnection connectionWithRequest:newRequest delegate:self];
}
- (void)stopLoading {
NSLog(#"stopLoading");
[self.connection cancel];
self.connection = nil;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[self.client URLProtocol:self didLoadData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[self.client URLProtocolDidFinishLoading:self];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[self.client URLProtocol:self didFailWithError:error];
}
#end
The new UrlProtocol using NSURLSessionDataTasks for every request:
#import "UrlProtocol.h"
#import "Globals.h"
#implementation UrlProtocol
+ (BOOL)canInitWithRequest:(NSURLRequest * _Nonnull) request {
if (![request.URL.absoluteString hasPrefix:#"http"]) return NO; //No need to intercept non-http requests
if ([NSURLProtocol propertyForKey:#"handled" inRequest:request]) {
return NO;
}
return YES;
}
+ (NSURLRequest * _Nonnull)canonicalRequestForRequest:(NSURLRequest * _Nonnull)request {
NSString* key = #"custom-auth-header";
Globals* globals = [Globals getInstance];
NSString* token = [globals token];
NSMutableURLRequest *newRequest = [request mutableCopy]; //Create a mutable copy that can be modified
[newRequest setValue:token forHTTPHeaderField:key];
return [newRequest copy]; //return a non-mutable copy
}
+ (BOOL)requestIsCacheEquivalent:(NSURLRequest * _Nonnull)a toRequest:(NSURLRequest * _Nonnull)b {
return [super requestIsCacheEquivalent:a toRequest:b];
}
- (void)startLoading {
NSMutableURLRequest *newRequest = [self.request mutableCopy];
[NSURLProtocol setProperty:#YES forKey:#"handled" inRequest:newRequest];
[Globals setUrlSessionDelegate:self];
Globals* globals = [Globals getInstance];
self.dataTask = [globals.session dataTaskWithRequest:newRequest];
[self.dataTask resume];
}
- (void)URLSession:(NSURLSession * _Nonnull)session dataTask:(NSURLSessionDataTask * _Nullable)dataTask didReceiveData:(NSData * _Nullable)data{
[self.client URLProtocol:self didLoadData:data];
}
- (void)URLSession:(NSURLSession * _Nonnull)session dataTask:(NSURLSessionDataTask * _Nullable)dataTask didReceiveResponse:(NSURLResponse * _Nullable)response
completionHandler:(void (^ _Nullable)(NSURLSessionResponseDisposition))completionHandler{
[self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed];
completionHandler(NSURLSessionResponseAllow);
}
- (void)URLSession:(NSURLSession * _Nonnull)session task:(NSURLSessionTask * _Nonnull)task didCompleteWithError:(NSError * _Nullable)error{
if (error){
[self.client URLProtocol:self didFailWithError:error];
} else {
[self.client URLProtocolDidFinishLoading:self];
}
}
- (void)URLSession:(NSURLSession * _Nonnull)session task:(NSURLSessionTask * _Nonnull)task willPerformHTTPRedirection:(NSHTTPURLResponse * _Nonnull)response
newRequest:(NSURLRequest * _Nonnull)request completionHandler:(void (^ _Nonnull)(NSURLRequest * _Nullable))completionHandler {
completionHandler(request);
}
- (void)stopLoading {
[self.dataTask cancel];
self.dataTask = nil;
}
#end
"Globals" is a singleton where I have initialized one NSURLSession meant to be used throughout the runtime of the app. It also contains the token I set as a custom HTTP header for all requests:
#import "Globals.h"
#import "UrlProtocol.h"
#implementation Globals
#synthesize token;
#synthesize session;
static Globals *instance = nil;
+(Globals*) getInstance
{
#synchronized(self)
{
if (instance == nil)
{
instance = [Globals new];
}
}
return instance;
}
//UrlProtocol class has no init method, so the NSURLSession delegate is being set on url load. We will ensure only one NSURLSession is created.
+(void) setUrlSessionDelegate:(UrlProtocol*) urlProtocol{
Globals* globals = [Globals getInstance];
if (!globals.session){
globals.session = [NSURLSession sessionWithConfiguration:NSURLSessionConfiguration.defaultSessionConfiguration delegate:urlProtocol delegateQueue:nil];
}
}
#end
Solved my problem by creating a new default NSURLSession for each NSURLSessionDataTask. Something was wrong with the way I was trying to share one NSURLSession for all my tasks. URLProtocol's startLoading method is now as follows:
- (void)startLoading {
NSMutableURLRequest *newRequest = [self.request mutableCopy];
[NSURLProtocol setProperty:#YES forKey:#"handled" inRequest:newRequest];
NSURLSessionConfiguration* config = NSURLSessionConfiguration.defaultSessionConfiguration;
NSURLSession* session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];
self.dataTask = [session dataTaskWithRequest:newRequest];
[self.dataTask resume];
}
The simple HTML page test before must have worked because only one task was needed to load the page
I am new to iOS development,
I want to stream video from webapi, The files are streamed from our backend server which requires authentication. It is key-based authenticated set in the Authorization HTTP Header.
I tried with AVPlayer didn't got my output. After doing some more research, i found customProtocol will be more useful do it so i have used customProtocol and tried with this code but the customProtocol is not getting called customProtocol.h, customProtocol.m
[NSURLProtocol registerClass:[MyCustomProtocol class]];
NSString *theURLString = #"customProtocol://abcd.com/download";
player = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:theURLString]];
[self.view addSubview:player.view];
player.view.frame = self.view.frame;
[player play];
Can any one help me here? where i a making mistake?
Thank you in advance!
This is my customProtocol code :
#implementation MyCustomProtocol
+ (BOOL) canInitWithRequest:(NSURLRequest *)request {
NSURL* theURL = request.URL;
NSString* scheme = theURL.scheme;
if([scheme isEqualToString:#"customProtocol"]) {
return YES;
}
return NO;
}
// You could modify the request here, but I'm doing my legwork in startLoading
+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
return request;
}
// I'm not doing any custom cache work
+ (BOOL) requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b {
return [super requestIsCacheEquivalent:a toRequest:b];
}
// This is where I inject my header
// I take the handled request, add a header, and turn it back into http
// Then I fire it off
- (void) startLoading {
NSMutableURLRequest* mutableRequest = [self.request mutableCopy];
Constants *constants = [Constants sharedInstance];
[mutableRequest setValue:[NSString stringWithFormat:#"Bearer %#",constants.access_token] forHTTPHeaderField:#"Authorization"];
NSURL* newUrl = [[NSURL alloc] initWithScheme:#"http" host:[mutableRequest.URL host] path:[mutableRequest.URL path]];
[mutableRequest setURL:newUrl];
self.connection = [NSURLConnection connectionWithRequest:mutableRequest delegate:self];
}
- (void) stopLoading {
[self.connection cancel];
}
// Below are boilerplate delegate implementations
// They are responsible for letting our client (the MPMovePlayerController) what happened
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[self.client URLProtocol:self didFailWithError:error];
self.connection = nil;
}
- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[self.client URLProtocol:self didLoadData:data];
}
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
[self.client URLProtocolDidFinishLoading:self];
self.connection = nil;
}
if you have passed authentication header with url then you can use below code
NSMutableDictionary * headers = [NSMutableDictionary dictionary];
[headers setObject:#"Your UA" forKey:#"User-Agent"];
AVURLAsset * asset = [AVURLAsset URLAssetWithURL:URL options:#{#"AVURLAssetHTTPHeaderFieldsKey" : headers}];
AVPlayerItem * item = [AVPlayerItem playerItemWithAsset:asset];
self.player = [[AVPlayer alloc] initWithPlayerItem:item];
it may work...try it
MPMoviePlayerViewController * movieController = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
movieController.moviePlayer.movieSourceType = MPMovieSourceTypeStreaming;
[self presentMoviePlayerViewControllerAnimated:movieController];
[movieController.moviePlayer play];
I'm trying to implement synchronous downloading with progress callback with NSURLConnection.
When [connection start] is invoked, nothing happens - delegate callback methods are not just invoked (i'm testing on OSX in XCTestCase). What's wrong?
// header
#interface ASDownloadHelper : NSObject <NSURLConnectionDelegate, NSURLConnectionDataDelegate>
{
NSMutableData *_receivedData;
NSUInteger _expectedBytes;
id<ASDownloadHelperListener> _listener;
NSError *_error;
BOOL _finished;
id _finishedSyncObject;
}
- (void) download: (NSString*)url file:(NSString*)file listener:(id<ASDownloadHelperListener>)listener;
#end
// impl
#implementation ASDownloadHelper
// delegate
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[_receivedData setLength:0];
_expectedBytes = [response expectedContentLength];
}
- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[_receivedData appendData:data];
int percent = round( _receivedData.length * 100.0 / _expectedBytes );
[_listener onDownloadProgress:_receivedData.length total:_expectedBytes percent:percent];
}
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
_error = error;
[self setFinished:YES];
}
- (NSCachedURLResponse *) connection:(NSURLConnection*)connection
willCacheResponse:(NSCachedURLResponse*)cachedResponse {
return nil;
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
[self setFinished: YES];
}
- (BOOL) isFinished {
#synchronized(_finishedSyncObject) {
return _finished;
}
}
- (void) setFinished: (BOOL)finished {
#synchronized(_finishedSyncObject) {
_finished = finished;
}
}
// ---
- (void) download: (NSString*)downloadUrl file:(NSString*)file listener:(id<ASDownloadHelperListener>)listener {
_listener = listener;
_finished = NO;
_finishedSyncObject = [[NSObject alloc] init];
_error = nil;
NSURL *url = [NSURL URLWithString:downloadUrl];
NSURLRequest *request = [NSURLRequest requestWithURL:url
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:30];
_receivedData = [[NSMutableData alloc] initWithLength:0];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request
delegate:self];
[connection start];
// block the thread until downloading finished
while (![self isFinished]) { };
// error?
if (_error != nil) {
#throw _error;
return;
}
// success
[_receivedData writeToFile:file atomically:YES];
_receivedData = nil;
}
#end
Your wait loop lock the CPU main thread to 100%, patch your wait loop with :
...
// block the thread until downloading finished
while (![self isFinished])
{
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1]];
};
...
Thanks to quellish i've found out that invocation queue should not be blocked as callback invocations (delegate methods) are done in invoker thread context. In my case i was running it in main test thread so i had to do workaround (and sleep in main thread for few seconds to let downloading finish):
- (void)testDownload
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {
// ...
[_downloadHelper download:repositoryUrl file:downloadedFile listener:downloadlistener];
// progress callbacks are invoked in this thread context, so it can't be blocked
// ...
XCTAssertNotNil( ... );
});
// block main test queue until downloading is finished
[[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:10]];
}
I created a class customDownload with the following methods:
-(NSString *) getTextFromLink: (PreliteRequest *) requestDetails
asyncConnection: (BOOL) isAsync
callbackMethod: (SEL) methodToExecute {
mainRequest = requestDetails;
NSMutableURLRequest *postRequest = [[NSMutableURLRequest alloc] init];
NSURLRequest *getRequest = [[NSURLRequest alloc] init];
NSURLConnection *connection;
NSURLResponse * response = nil;
NSError * error = nil;
if ([[requestDetails getType] isEqualToString:#"POST"]) {
[postRequest setURL:[NSURL URLWithString:[requestDetails getUrl]]];
[postRequest setHTTPMethod:[requestDetails getType]];
[postRequest setValue:[requestDetails getPostLenght] forHTTPHeaderField:#"Content-Length"];
[postRequest setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[postRequest setHTTPBody:[requestDetails getPostParameters]];
if (isAsync) {
tmpMethod = methodToExecute;
connection = [[NSURLConnection alloc] initWithRequest:postRequest delegate:self];
} else
downloadedData = (NSMutableData *)[NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error];
} else {
getRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:#"%#%#",[requestDetails getUrl],[requestDetails getGetParameters]]]];
if (isAsync) {
tmpMethod = methodToExecute;
connection = [[NSURLConnection alloc] initWithRequest:getRequest delegate:self];
} else
downloadedData = (NSMutableData *)[NSURLConnection sendSynchronousRequest:getRequest returningResponse:&response error:&error];
}
NSString *result=[[NSString alloc]initWithData:downloadedData encoding:NSUTF8StringEncoding];
return result;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
downloadedData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
// Append the new data to the instance variable you declared
[downloadedData appendData:data];
}
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
willCacheResponse:(NSCachedURLResponse*)cachedResponse {
return nil;
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSString *tmpResult = [[NSString alloc]initWithData:downloadedData encoding:NSUTF8StringEncoding];
[self performSelector:tmpMethod withObject:tmpResult];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSLog(#"Connection error: %#",error);
}
In my view controller I declare the previous class and call the only method of that class getTextFromLink.
download = [[customDownload alloc] init];
[download getTextFromLink:request asyncConnection:YES callbackMethod:tmpSelector];
SEL tmpSelector = #selector(printResult:);
-(void) printResult:(NSString *) resultToPrint {
NSLog(#"Risultato: %#",resultToPrint);
}
I pass to getTextFromLink the tmpSelector as parameter because that is the method I would like to call as soon the getTextFromDownloadLink has finished its job.
Actually getTextFromLink execute an asynchronous connection.
What I'm trying to do is to execute something when the asyncronous connection finished to download datas.
I would like to create a callback custom class to do this.
Can anyone help me?
Rather than this selector model, generally people would use blocks for this. For example, define a typedef for your block:
typedef void(^PreliteRequestCompletionHandler)(NSString *string);
Since you're dealing with an asynchronous pattern, you might want to define a property which you can use to save this completion handler to call later:
#property (nonatomic, copy) PreliteRequestCompletionHandler completionHandler;
You can then change that selector parameter to be a block parameter:
-(NSString *) getTextFromLink: (PreliteRequest *) requestDetails
asyncConnection: (BOOL) isAsync
completionHandler: (PreliteRequestCompletionHandler)completionHandler {
self.completionHandler = completionHandler;
// do stuff
}
And then, when you want to call that completion block, you do something like:
NSString *result = ...;
if (self.completionHandler) {
self.completionHandler(result);
}
And then you can now use this new block parameter to your method:
download = [[customDownload alloc] init];
[download getTextFromLink:request asyncConnection:YES completionHandler:^(NSString *result) {
NSLog(#"Risultato: %#", result);
}];
I am trying to execute a async http request. but the call back log is not working. please analyze the code and suggest me the cause of this issue. I have seen the class examples in many places. But here i am calling it from a main function.
#interface HTTP : NSObject
#property (nonatomic,retain) NSMutableData *receivedData;
- (void) get : (NSString *) urlString;
#end
#implementation HTTP
#synthesize receivedData;
- (void)get: (NSString *)urlString {
NSLog ( #"GET: %#", urlString );
self.receivedData = [[NSMutableData alloc] init];
NSURLRequest *request = [[NSURLRequest alloc]
initWithURL: [NSURL URLWithString:urlString]
cachePolicy: NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval: 10
];
NSURLConnection *connection = [[NSURLConnection alloc]
initWithRequest:request
delegate:self
startImmediately:YES];
[connection start];
}
- (void)connection:(NSURLConnection*) connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(#"Response recieved");
}
- (void)connection:(NSURLConnection*) connection didReceiveData:(NSData *)data
{
NSLog(#"Data recieved");
NSString* responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
[receivedData appendData:responseString];
}
#end
int main(const int c , char *arg[]){
HTTP *http = [[HTTP alloc] init];
[http get:#"http://www.apple.com"];
return 0;
}
Your program does not have a "run loop", therefore it terminates immediately after
[http get:#"http://www.apple.com"];
has returned, before any delegate functions are called. (Note that NSURLConnection works asynchronously.)
If this is for a stand-alone OS X application, you could to the following:
int main(const int c , char *arg[]){
HTTP *http = [[HTTP alloc] init];
[http get:#"http://www.apple.com"];
NSRunLoop *theRL = [NSRunLoop currentRunLoop];
while (shouldKeepRunning && [theRL runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]);
return 0;
}
where shouldKeepRunning is a (global) Boolean variable that is initially YES, and set to NO in
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
shouldKeepRunning = NO;
}
and also in connection:didFailWithError:. Or you add a Boolean property loading to your HTTP class.
If this is for an iOS application or a OS X Cocoa application, then you already have a run loop and don't have to add your own.
/*
Till the application finishes loading, the main thread is kept alive so that the delegate methods are called.
Hence the while loop below.
*/
while(!finished) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}
Here is my working code.
#implementation HTTP
#synthesize receivedData,retStr,delegate;
- init {
if ((self = [super init])) {
receivedData = [[NSMutableData alloc] init];
}
return self;
}
- (void)get: (NSString *)urlString {
NSLog ( #"GET: %#", urlString );
self.receivedData = [[NSMutableData alloc] init];
NSURLRequest *request = [[NSURLRequest alloc]
initWithURL: [NSURL URLWithString:urlString]
cachePolicy: NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval: 10
];
NSURLConnection *connection = [[NSURLConnection alloc]
initWithRequest:request
delegate:self
startImmediately:YES];
while(!finished) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}
if(!connection) {
NSLog(#"connection failed :(");
} else {
NSLog(#"connection succeeded :)");
}
}
- (void)post:(NSString*)urlString: (NSString*)body: (NSObject*) sender {
// POST
NSMutableString* requestURL = [[NSMutableString alloc] init];
[requestURL appendString:urlString];
NSMutableString* requestBody = [[NSMutableString alloc] initWithString:body];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: [NSString stringWithString:requestURL]]];
NSString* requestBodyString = [NSString stringWithString:requestBody];
NSData *requestData = [NSData dataWithBytes: [requestBodyString UTF8String] length: [requestBodyString length]];
[request setHTTPMethod: #"POST"];
[request setValue:#"text/html; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody: requestData];
NSURLConnection *postConn= [[NSURLConnection alloc] initWithRequest:request delegate:sender];
/*
Till the application finishes loading, the main thread is kept alive so that the delegate methods are called.
Hence the while loop below.
*/
while(!finished) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}
if(!postConn) {
NSLog(#"POST connection failed :(");
} else {
NSLog(#"POST connection succeeded :)");
}
}
// ====================
// Callbacks
// ====================
#pragma mark NSURLConnection delegate methods
- (NSURLRequest *)connection:(NSURLConnection *)connection
willSendRequest:(NSURLRequest *)request
redirectResponse:(NSURLResponse *)redirectResponse {
NSLog(#"Connection received data, retain count");
return request;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSLog(#"Received response: %#", response);
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSLog(#"Received %lu bytes of data", [data length]);
[receivedData appendData:data];
NSLog(#"Received data is now %lu bytes", [receivedData length]);
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSRunAlertPanel(#"Error",[NSString stringWithFormat:#"Could not connect to server.Following error occured:\n\n%#", error], nil, nil, nil);
NSLog(#"Error receiving response: %#", error);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// Once this method is invoked, "responseData" contains the complete result
NSLog(#"Succeeded! Received %lu bytes of data", [receivedData length]);
NSString *dataStr=[[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding] ;
retStr = [NSString stringWithString:dataStr];
finished =TRUE;
// [self returnDcString:dataStr];
// NSLog(#"%#",dataStr);
if ([delegate respondsToSelector:#selector(didFinishDownload:)]) {
NSLog(#"Calling the delegate");
//NSString* dataAsString = [[[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding] autorelease];
// [delegate performSelector:#selector(didFinishDownload:) withObject: dataStr];
}
}
- (void)setDelegate:(id)val
{
delegate = val;
}
- (id)delegate
{
return delegate;
}
#end