Generating a URL string for NSURLRequest fails to initiate - iphone

This one has me pretty confused. If I put in the following:
NSString *LoginURLString = [NSString stringWithFormat:#"http://dispatch.americantaxi.com:8080/AT/servlet/OnlineOrderServices?command=retrieveCustomerCommonPlaces&customerId=13242134"];
//NSLog output: http://dispatch.americantaxi.com:8080/AT/servlet/OnlineOrderServices?command=retrieveCustomerCommonPlaces&customerId=2314084
And use this in a URL request, it works fine, but I need to make this dynamic, so I have it concatenate the URL string with a new UserID by using the following:
NSString *user = [NSString stringWithFormat:#"%#", [[NSUserDefaults standardUserDefaults]stringForKey:#"CustomerID"]];
//user = [[NSUserDefaults standardUserDefaults] stringForKey:#"CustomerID"];
NSString *LoginURLString = [NSString stringWithFormat:#"http://dispatch.americantaxi.com:8080/AT/servlet/OnlineOrderServices?command=retrieveCustomerCommonPlaces&customerId=%#", user];
//NSLog output: http://dispatch.americantaxi.com:8080/AT/servlet/OnlineOrderServices?command=retrieveCustomerCommonPlaces&customerId=2314084
Here is the rest of my request initializer:
NSString *urlString = LoginURLString;
responseData = [NSMutableData data];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
And the other methods that handle the request:
-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
[responseData setLength:0];
}
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[responseData appendData:data];
}
-(void) connectionDidFinishLoading:(NSURLConnection *)connection{
// [connection release];
CommonPickUpArray = [[NSMutableArray alloc] init];
CommonLocationInfoArray = [[NSMutableArray alloc] init];
NSString *data = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding];
NSLog(#"%#", data);
}
This request never even starts. I really don't understand why. I have tried to output the two strings to the NSLog and either way they look exactly the same. Can anyone explain? Thanks for your help!
Edit: The Connection didFailWithError method is outputting this:
Error Domain=NSURLErrorDomain Code=-1000 "bad URL" UserInfo=0xf6a6f50 {NSUnderlyingError=0xf6a75d0 "bad URL", NSLocalizedDescription=bad URL}
Output from answer 1:
2012-05-08 13:45:24.959 AmericanTaxi[1295:707] Connection failed with error: bad URL
2012-05-08 13:45:24.960 AmericanTaxi[1295:707] for the URL: (null)
Output of urlString and LoginURLString:
2012-05-08 13:57:40.415 AmericanTaxi[1320:707] LoginURLString: http://dispatch.americantaxi.com:8080/AT/servlet/OnlineOrderServices?command=retrieveCustomerCommonPlaces&customerId=2314084
2012-05-08 13:57:40.417 AmericanTaxi[1320:707] urlstring: http://dispatch.americantaxi.com:8080/AT/servlet/OnlineOrderServices?command=retrieveCustomerCommonPlaces&customerId=2314084

In your didFailWithError, check the URL and see why it is bad by adding this to your didFailWithError delegate:
NSLog(#"Connection failed with error: %#", [error localizedDescription]);
NSLog(#"for the URL: %#", [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
Post the result.

Related

How to download CSV file from server in Objective-C

I'm developing a new iPhone application, Here i have parsed a 'csv' file from local, and its working with me. When i try to download the 'csv' file from the server programmatically, it didn't workout for me. Could you please help me?
Loading data from local file (Working fine)
- (void)viewDidLoad
{
[super viewDidLoad];
NSString * file = [[NSBundle bundleForClass:[self class]] pathForResource:#"sample" ofType:#"csv"];
NSStringEncoding encoding = 0;
NSString * csv = [NSString stringWithContentsOfFile:file usedEncoding:&encoding error:nil];
NSArray *fields = [csv CSVComponents];
NSLog(#"fields: %#", fields); //getting the result content
}
Download the file from Server (failed)
-(void) connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"connectionDidFinishLoading"); //nothing showing here
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *fullName = [NSString stringWithFormat:#"quotes.csv"];
NSString *fullFilePath = [NSString stringWithFormat:#"%#/%#",docDir,fullName];
[receivedData writeToFile:fullFilePath atomically:YES];
}
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSLog(#"data: %#", data); //nothing showing here
if (receivedData)
[receivedData appendData:data];
else
receivedData = [[NSMutableData alloc] initWithData:data];
}
- (void)loadDatafromURL
{
NSURL *url = [NSURL URLWithString:#"http://download.finance.yahoo.com/d/quotes.csv?s=^GSPC,^IXIC,^dji,^GSPC,^BVSP,^GSPTSE,^FTSE,^GDAXI,^FCHI,^STOXX50E,^AEX,^IBEX,^SSMI,^N225,^AXJO,^HSI,^NSEI&f=sl1d1t1c1ohgv&e=.csv"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection connectionWithRequest:request delegate:self];
}
Implement this method:
-(void)connection:(NSURLConnection *)conn didFailWithError:(NSError *)error
You'll find that you're getting an error of
Error Domain=NSURLErrorDomain Code=-1000 "bad URL" UserInfo=0xf663f40 {NSUnderlyingError=0xf663de0 "bad URL", NSLocalizedDescription=bad URL}
I've looked into downloading information this way before, and I think one problem you're having is that separate symbols have to be separated with a "+". Also, when pulling an index, you can't pass the "^" symbol as part of the URL. You have to replace it with "%5E".
So, add this:
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(#"%#", [error description]);
}
And change your URL to this:
NSString *urlString = #"http://download.finance.yahoo.com/d/quotes.csv?s=^GSPC+^IXIC+^dji+^GSPC+^BVSP+^GSPTSE+^FTSE+^GDAXI+^FCHI+^STOXX50E+^AEX+^IBEX+^SSMI+^N225+^AXJO+^HSI+^NSEI&f=sl1d1t1c1ohgv&e=.csv";
NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];
Now it works for me! I even checked the output .csv file, and it looks good to go! One full quote per line.
If you plan on fetching more data over the network than this single csv, you could have a look at AFNetworking, it's a great library for doing network operations.
A working solution would then look a bit like this:
- (void)getCSVAsynch {
NSString *unescaped = #"http://download.finance.yahoo.com/d/quotes.csv?s=^GSPC,^IXIC,^dji,^GSPC,^BVSP,^GSPTSE,^FTSE,^GDAXI,^FCHI,^STOXX50E,^AEX,^IBEX,^SSMI,^N225,^AXJO,^HSI,^NSEI&f=sl1d1t1c1ohgv&e=.csv";
NSURL *url = [NSURL URLWithString:[unescaped stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"CSV: %#", [[NSString alloc] initWithBytes:[responseObject bytes] length:[responseObject length] encoding:NSUTF8StringEncoding]);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Things go boom. %#", [error localizedDescription]);
}];
[operation start];
}

NSURLConnection returns data but I cannot read it

This is another simple question who'se answer escapes me after a hour on Google...
A user is typing something into a text field and upon this field loosing focus, I launch an NSURLConnection....
NSString *usernameTry = [sender text];
NSLog(#"username field = %#",usernameTry);
NSString *content = [#"http://www.siebenware.de/Rhythm/user/checkusername.php?username=" stringByAppendingString:usernameTry];
content = [content stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:content] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:5.0];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
NSLog(#"%#",content);
Then I wait for the response....
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSLog(#"Received Response");
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
int status = [httpResponse statusCode];
if (!((status >= 200) && (status < 300))) {
NSLog(#"Connection failed with status %#", status);
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[resultsData appendData:data];
NSString *resultsString = [[NSString alloc] initWithData:resultsData encoding:NSUTF8StringEncoding];
NSLog(#"received data %# %i",resultsString,[resultsString length]);
if ([resultsString isEqualToString: #"FAIL"]){
NSLog(#"failed to retrieve data");
}else{
resultsObjects = [[resultsString componentsSeparatedByString:#":"] mutableCopy];
if([resultsObjects objectAtIndex:0]==#"usernamecheck"){
if ([resultsObjects objectAtIndex:1]==username.text) {
if ([resultsObjects objectAtIndex:2]==#"NG"){
//set the check marker to bad
[usernameVer setImage:[UIImage imageNamed:#"redcross.png"]];
}else{
//set the check market to good
[usernameVer setImage:[UIImage imageNamed:#"greentick.png"]];
}
}
}
}
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog([NSString stringWithFormat:#"Connection failed: %#", [error description]]);
UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:#"Unable to retrieve data" message:[NSString stringWithFormat:#"Error code %i",[error code]] delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
}
I see the response arrive in didReceiveResponse and am getting 18 bytes of data (which is correct).
However didReceiveData says that the 'data' is null. I know I am missing something exceptionally simple, and I promise to kick myself once this is cleared up.
Regards
Chris H
if you want to change the data into an NSString you can do this:
NSString *responsestring = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"%#", responsestring);
You need work with your data in:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;
Because
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
can be called many times
You can do that:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[myData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// TODO: work with data
}
NSMutableData* myData must be instance var.
You need to convert the NSMutableData received by the NSURLConnection delegate method to readable NSString by using the below code
NSString *finalString = [[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
and that should do it.
Try with other encoding..May be ASCII encoding instead of UTF-8..It may work out

Returning a string from an NSURLRequest

Is anybody able to help me get a string returned from an NSURLRequest on an iPhone app? I have to send some user credentials to a URL and it will return a customer ID number. That is what I need to be pulled in as a string, I am not used to doing working with servers or HTTP requests, so any help will be great. I have already read the Apple Docs about it and am a bit lost on this part.
This is a standard pattern async downloader:
In .h file:
NSMutableData *responseData;
And .m file:
-(void) execute {
NSString *urlString = #"http://www.google.com";
responseData = [[NSMutableData data] retain];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
[responseData setLength:0];
}
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[responseData appendData:data];
}
-(void) connectionDidFinishLoading:(NSURLConnection *)connection{
[connection release];
NSString *data = [[[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding] autorelease];
NSLog(#"%#", data);
[responseData release];
}
This will download Google and outprint the content.

rest web services in iphone

I have a problem now. I need to pass an transactionID and an user password to a rest service and it is suppose to return me a true/false value (in XML format). However, it is consistently returning me (null).. I am totally lost some one please help.
NSString *urlString = [NSString stringWithFormat:#"https://10.124.128.93:8443/axis2/services/C3WebService/completeWithdrawal Transaction?transactionId=%#&password=%#", _transactionID.text, _userPassword.text];
NSURL *url = [[NSURL alloc] initWithString:urlString];
NSString *result = [[NSString alloc] initWithContentsOfURL:url];
NSLog(#"%#",result );
My result is constantly returning me null. How do i continue from here?
.h:
NSMutableData *responseData;
.m:
- (void)load {
NSURL *myURL = [NSURL URLWithString:#"https://10.124.128.93:8443/axis2/services/C3WebService/completeWithdrawal Transaction?transactionId=%#&password=%#", _transactionID.text, _userPassword.text];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:myURL
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:60];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
responseData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[responseData release];
[connection release];
[textView setString:#"Unable to fetch data"];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"Succeeded! Received %d bytes of data",[responseData
`enter code here` length]);
NSString *txt = [[[NSString alloc] initWithData:responseData encoding: NSASCIIStringEncoding] autorelease];
}
Consider using NSURLConnection which has a callback for the result and also a callback to get detailed error details. It als doesn't execute on the UI thread (doesn't hang UI during the request).
NSURL *url = [NSURL URLWithString:#"http://www.mysite.com"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
[request setHTTPMethod:#"GET"];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
Then you can implement the delegate methods to get the error, the data and other details:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
[connection release];
NSString* responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"result: %#", responseString);
[responseString release];
}
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(#"error - read error object for details");
}
You might try using "initWithContentsOfURL:encoding:error:" instead and check "error". Also, use Charles or other http sniffer and compare results to a straight browser request ( did you check results in a browser?)

Send HTTP request in objective c

I need to connect to a server without typing "http://". I have to get only the server name and port number from the user. With this, I should be able to connect to a particular server...
In its simplest form, it looks something like this:
- (void)loadHostName:(NSString *)hostName onPort:(NSInteger)portNumber {
responseData = [[NSMutableData alloc] init];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"http://%#:%i", hostName, portNumber]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection release];
}
- (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 {
NSLog(#"Oh noes! %#", [error localizedDescription]);
[responseData release];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// Do something with the data, like load it in a web view.
[webView loadData:responseData MIMEType:#"text/html" textEncodingName:#"utf-8" baseURL:nil];
[responseData release];
}
In production code, you should handle cache requests, authentication challenges etc. (see the messages on NSURLConnection), but the above example will send an HTTP request and load it into a web view.
Try this,
NSURL *aUrl = [NSURL URLWithString:[NSString stringWithFormat:#"http://%#:%i", hostName, portNumber]];
NSURLRequest *request = [NSURLRequest requestWithURL:aUrl
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
NSURLResponse *resp = nil;
NSError *err = nil;
NSData *response = [NSURLConnection sendSynchronousRequest: theRequest returningResponse: &resp error: &err];
NSString * theString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
[resp release];
[err release];
NSLog(#"response: %#", theString);
well you can hardcode HTTP:// with the server name
example
NSString *serverName = "stackoverflow.com";
NSNumber *portNumber = 10;
NSString *finalYrl = [NSString StringWithFormat:#"HTTP://%#:%#",serverName , portNumber];