My progress indicator is not working in cocoa webview I used this code -
-(void)download:(NSURLDownload *)download didReceiveResponse:(NSURLResponse *)response {
NSLog(#"downl didreceiveresponse here");
NSLog(#"Recieved reponse with expected length: %lli", [response expectedContentLength]);
payload=0;
[payload setLength:0];
[progrssbar setMaxValue:[response expectedContentLength]] ;
[self setProgrssbar:progrssbar];
}
- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)data
{
NSLog(#"Recieving data. Incoming Size: %li Total Size: %li", (unsigned long)[data length], (unsigned long)[payload length]);
[payload appendData:data];
[progrssbar setDoubleValue:[payload length]];
}
- (void)download:(NSURLDownload *)download didReceiveDataOfLength:(unsigned)length
{
NSLog(#"downl receivedata here%i",length);
[progrssbar setHidden:NO];
[progrssbar setIndeterminate:NO];
[progrssbar startAnimation:self];
[progrssbar setDoubleValue:(double)length]; [progrssbar displayIfNeeded];
}
What exactly is payload declared as? I used a similar code where I declared NSMutableData *payload and then in -(void)download:(NSURLDownload *)download didReceiveResponse:(NSURLResponse *)response I used payload=[NSMutableData data] instead of your payload=0, maybe that is the problem?
Related
I'm using
[NSURLConnection connectionWithRequest:req delegate:self];
and then I use
-(BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace;
-(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
-(void)connectionDidFinishLoading:(NSURLConnection *)connection;
to handle data loading. Everything is ok and working fine but I don't like the beauty of this code )
I wish to use blocks, to make my code looks like this:
[myConnection sendData:data
successBlock:^(void){NSLog(#"success");}
errorBlock:^(NSError * error){NSLog(#"error.description: %#", error.description);}];
is it possible to use NSURLConnection with blocks?
I use this class:
The MyConnection.h
#import <Foundation/Foundation.h>
#interface MyConnection : NSObject <NSURLConnectionDelegate, NSURLConnectionDataDelegate> {
NSURLConnection * internalConnection;
NSMutableData * container;
}
-(id)initWithRequest:(NSURLRequest *)req;
#property (nonatomic,copy)NSURLConnection * internalConnection;
#property (nonatomic,copy)NSURLRequest *request;
#property (nonatomic,copy)void (^completitionBlock) (id obj, NSError * err);
-(void)start;
#end
And the MyConnection.m
#import "MyConnection.h"
static NSMutableArray *sharedConnectionList = nil;
#implementation MyConnection
#synthesize request,completitionBlock,internalConnection;
-(id)initWithRequest:(NSURLRequest *)req {
self = [super init];
if (self) {
[self setRequest:req];
}
return self;
}
-(void)start {
container = [[NSMutableData alloc]init];
internalConnection = [[NSURLConnection alloc]initWithRequest:[self request] delegate:self startImmediately:YES];
if(!sharedConnectionList)
sharedConnectionList = [[NSMutableArray alloc] init];
[sharedConnectionList addObject:self];
}
#pragma mark NSURLConnectionDelegate methods
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[container appendData:data];
}
//If finish, return the data and the error nil
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
if([self completitionBlock])
[self completitionBlock](container,nil);
[sharedConnectionList removeObject:self];
}
//If fail, return nil and an error
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
if([self completitionBlock])
[self completitionBlock](nil,error);
[sharedConnectionList removeObject:self];
}
#end
to use it:
MyConnection * connection = [[MyConnection alloc]initWithRequest:req];
[connection setCompletitionBlock:^(id obj, NSError *err) {
if (!err) {
//It's ok, do domething with the response data (obj)
} else {
//There was an error
}
}];
[connection start];
It's based on the code, The Big Nerd Ranch uses on his book.
I hope it will be helpful.
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
NSLog(#"%#", response);
NSLog(#"%#", data);
}];
I have implemented the NSCoding protocol for my classes, and I am using the following code in my NSDocument subclass to save and load:
- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError {
[[record window] endEditingFor:nil];
return [NSKeyedArchiver archivedDataWithRootObject:self];
}
- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError{
#try {
NSLog(#"Loading...");
self = [NSKeyedUnarchiver unarchiveObjectWithData:data];
}
#catch (NSException *exception) {
if (outError) {
NSDictionary *d = [NSDictionary dictionaryWithObject:#"The data is corrupted" forKey:NSLocalizedFailureReasonErrorKey];
*outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:d];
}
}
NSLog(#"whiteMoves count: %ld",[whiteMoves count]);
}
It all seems to be working fine. I can save a file and when I open it and step through the code it all seems to unarchive and decode fine. However, on completion of the 'load event' my application always pops up an error window that says "The document "xxx.xxx" could not be loaded." I cannot find where this error is being triggered from nor any documentation on it.
Does any one know where it comes from or know where it might be documented?
Thanks
Lee
You don't appear to be returning YES or NO from readFromData:
- (BOOL)readFromData:(NSData *)data
ofType:(NSString *)typeName
error:(NSError **)outError
{
BOOL retval = YES;
#try
{
NSLog(#"Loading...");
self = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(#"whiteMoves count: %ld",[whiteMoves count]);
}
#catch (NSException *exception)
{
if (outError != nil)
{
NSDictionary *d = [NSDictionary dictionaryWithObject:#"The data is corrupted" forKey:NSLocalizedFailureReasonErrorKey];
*outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:d];
}
retval = NO;
}
return retval;
}
This looks chess-related; can I ask what you are writing?
When I use the following code I was told there is a leak:
- (void)dealloc
{
[connection release], connection = nil;
[responseData release],responseData = nil;
[cityCode release], cityCode = nil;
[requestUrlString release], requestUrlString = nil;
[returnDataDic release], returnDataDic = nil;
[super dealloc];
}
- (id)initWithCityCode:(NSString *)aCityCode
requestURL:(NSString*)urlString
responseType:(SWEngineRequestType)theResponsetype
target:(id)theTarget
action:(SEL)theAction
{
if ((self = [super init]))
{
_isExecuting = NO;
_isFinished = NO;
target = theTarget;
action = theAction;
cityCode = [aCityCode retain];
requestUrlString = [urlString copy];
responseType = theResponsetype;
returnDataDic = [[NSMutableDictionary alloc] initWithCapacity:1];
if (cityCode)
{
[returnDataDic setObject:cityCode forKey:SWEATHER_CITYCODE];
}
[returnDataDic setObject:[NSNumber numberWithInt:responseType] forKey:SWEATHER_DOWNTYPE];
}
return self;
}
- (BOOL)isConcurrent
{
return YES;
}
- (void)finish
{
[self willChangeValueForKey:#"isExecuting"];
[self willChangeValueForKey:#"isFinished"];
_isExecuting = NO;
_isFinished = YES;
[self didChangeValueForKey:#"isExecuting"];
[self didChangeValueForKey:#"isFinished"];
[connection release], connection = nil;
[responseData release],responseData = nil;
[cityCode release], cityCode = nil;
[requestUrlString release], requestUrlString = nil;
[returnDataDic release], returnDataDic = nil;
done = YES;
}
- (BOOL)isExecuting
{
return _isExecuting;
}
- (BOOL)isFinished
{
return _isFinished;
}
- (void)main
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
done = NO;
if ([self isCancelled])
{
[self willChangeValueForKey:#"isFinished"];
_isFinished = YES;
[self didChangeValueForKey:#"isFinished"];
[pool release];
return;
}
[self willChangeValueForKey:#"isExecuting"];
_isExecuting = YES;
[self didChangeValueForKey:#"isExecuting"];
NSURL * urlToDownLoad = [NSURL URLWithString:[requestUrlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:urlToDownLoad cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:20];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if (connection)
{
responseData = [[NSMutableData alloc] init];
[connection start];
}
else
{
[self finish];
}
if (connection != nil)
{
do
{
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}
while (!done);
}
[pool release], pool = nil;
}
#pragma mark -
#pragma mark - NSURLConnectionDataDelegate methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[responseData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[returnDataDic setObject:#"error" forKey:...];
[target performSelectorOnMainThread:action withObject:returnDataDic waitUntilDone:NO];
[self finish];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[returnDataDic setObject:responseData forKey:...];
[target performSelectorOnMainThread:action withObject:returnDataDic waitUntilDone:NO];
[self finish];
}
#end
the instrument gave me a leak at: [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]; Why? Thanks!
I just want to have a Asynchronous download at a operation but I use the NSAutoreleasePool then the instrument gave a leak at the:[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];.
Try putting your
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
in an autorelease pool.
What object did Instruments identify as having leaked? Where was it allocated? What was the stack trace?
When you run a run loop, all of the run loop sources and run loop observers may fire. So those few lines of code hide a near infinite set of possible things happening as the run loop runs. Any one of those may have a leak, or Instruments may be mistaken.
It is usually a bad idea to run the run loop in the default mode in an inner loop. It's not clear what you're trying to do with that loop, but generally you should schedule any of your own run loop sources in a private run loop mode and then run the run loop in that mode. That way, you're sure that only your own sources get run, which is usually what you want.
When trying to compile an infinite while loop in xcode iphone view based application, it gives me an error that reads expected identifier or '(' before 'while'. I made it as simple as possible. Sorry about the picture. Code block was not working. If you want to see an image of the code, here is the link. http://www.freeimagehosting.net/uploads/931d5d8788.gif
#import "Lockerz_NotifierViewController.h"
#implementation Lockerz_NotifierViewController
NSMutableData *responseData;
while (1) {
NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://amicionline.me"]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
// create a connection
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if(theConnection) {
// create the datum
responseData=[[NSMutableData data] retain];
} else {
// code this later
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[responseData setLength:0];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// make it work
NSLog(#"Succeeded! Received %d bytes of data:",[responseData length]);
// release it
[connection release];
[responseData release];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
What are you trying to do? You can't write code directly in an #implementation. You must put it inside a method, for example:
-(void)start {
while (1) {
...
}
}
I need to wait for a response from a SOAP webservice, I am calling via a NSURLConnection as I need to manipulate the data being returned and then return it from my class to the calling class..
Here is my code:
#import <Foundation/Foundation.h>
#interface UsersBLL : NSObject {
NSMutableData *webData;
NSMutableString *soapResults;
NSXMLParser *xmlParser;
BOOL *recordResults;
NSNumber *EmailCount;
}
#property(nonatomic, retain) NSMutableData *webData;
#property(nonatomic, retain) NSMutableString *soapResults;
#property(nonatomic, retain) NSXMLParser *xmlParser;
-(int)checkEmailAddress:(NSString*)emailAddress;
#end
#import "UsersBLL.h"
#implementation UsersBLL
#synthesize webData;
#synthesize soapResults;
#synthesize xmlParser;
-(id)init {
self = [super init];
return self;
}
-(int)checkEmailAddress:(NSString*)emailAddress {
// Build the SOAP envelope
NSString *soapMessage = [NSString stringWithFormat:
#"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
"<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
"<soap:Body>\n"
"<CheckEmailAddress xmlns=\"http://tempuri.org/\">\n"
"<EmailAddress>%#</EmailAddress>\n"
"</CheckEmailAddress>\n"
"</soap:Body>\n"
"</soap:Envelope>\n", emailAddress];
NSLog(soapMessage);
NSURL *url = [NSURL URLWithString:#"http://photoswapper.mick-walker.co.uk/UsersService.asmx?op=CheckEmailAddress"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:#"%d", [soapMessage length]];
[theRequest addValue: #"text/xml; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
[theRequest addValue: #"http://tempuri.org/CheckEmailAddress" forHTTPHeaderField:#"SOAPAction"];
[theRequest addValue: msgLength forHTTPHeaderField:#"Content-Length"];
[theRequest setHTTPMethod:#"POST"];
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if( theConnection )
{
webData = [[NSMutableData data] retain];
}
else
{
NSLog(#"theConnection is NULL");
}
NSLog(#"%#", EmailCount);
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[webData setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[webData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"ERROR with theConenction");
[connection release];
[webData release];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"DONE. Received Bytes: %d", [webData length]);
NSString *theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
NSLog(theXML);
[theXML release];
if( xmlParser )
{
[xmlParser release];
}
xmlParser = [[NSXMLParser alloc] initWithData: webData];
[xmlParser setDelegate: self];
[xmlParser setShouldResolveExternalEntities: YES];
[xmlParser parse];
[connection release];
[webData release];
}
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qName
attributes: (NSDictionary *)attributeDict
{
if( [elementName isEqualToString:#"CheckEmailAddressResult"])
{
if(!soapResults)
{
soapResults = [[NSMutableString alloc] init];
}
recordResults = TRUE;
}
}
-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if( recordResults )
{
[soapResults appendString: string];
}
}
-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if( [elementName isEqualToString:#"CheckEmailAddressResult"])
{
recordResults = FALSE;
NSNumberFormatter *formatter = [[NSNumberFormatter alloc]init];
EmailCount = [formatter numberFromString:soapResults];
[formatter release];
[soapResults release];
soapResults = nil;
}
}
#end
CheckEmailAddress is declared as returning an integer value (I know it returns nothing in the sample above).
What I ideally want, is through the CheckEmailAddress method, return the value retrieved from the web service. However as the call NSURLConnection does not wait until the request has completed, I cannot do it.
I would be grateful if anyone could give me any potential ideas for workarounds.
The simplest solution would be using [NSURLConnection sendSynchronousRequest:returningResponse:error:].
It does not allow as much control as the approach you've taken, but is usually enough for most applications.
I have just posted a solution which wraps an asynchronous NSURLConnection to be able to block the calling thread. In case you need more control than the standard [NSURLConnection sendSynchronousRequest:returningResponse:error:] you can check out this link on StackOverflow:
NSURLConnection blocking wrapper implemented with semaphores
You have two choices:
Use +[NSURLConnection sendSynchronousRequest:returningResponse:error:]
Schedule the connection in a custom runloop mode, and run the loop in that mode until the data arrives or you have need to cancel the connection
It all depends on the level of asynchronism you need:
If it's OK to stay blocked during the whole request you may want to use
+[NSURLConnection sendSynchronousRequest:returningResponse:error:]
But, as suggested by Wade, be careful to add a timeout to your NSURLRequest, otherwise the connection might blocks and your application will hang.
If not, you can simply use the NSNotificationCenter. But you must be careful with race conditions over your data, specially if you are handling multiple requests