OK, I have a login screen that sends username and password to a PHP page. The PHP page echo's Yes or No based on the login status, but I would like it to echo the user id from the database for further use. Do I have to use JSON for this? I dont know how to retrieve more than one echo's. Currently the code is:
- (IBAction) login: (id) sender
{
NSString *post =[NSString stringWithFormat:#"username=%#&password=%#",usernameField.text, passwordField.text];
NSString *hostStr = #"https://www.mysite.com/login.php?";
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL = [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
if([serverOutput isEqualToString:#"Yes"]){
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"Business Manager" message:#"Login Successful"
delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alertsuccess show];
[alertsuccess release];
RootViewController *viewMenu = [[RootViewController alloc]
initWithNibName:#"RootViewController" bundle:[NSBundle mainBundle]];
self.rootViewController = viewMenu;
[viewMenu release];
[self.navigationController pushViewController:self.rootViewController animated:YES];
} else {
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Username or Password Incorrect"
delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alertsuccess show];
[alertsuccess release];
}
}
Now I just want to pull one more echo called "ID". Forming JSON for this seems arbitrary.
Technically you can use whatever response format you want -- though it's best to stick with something standard as you'll be able to find libraries made for you already. A REST service with a JSON response is a pretty easy way to facilitate communication between a server and client, so it would probably be a good idea to start there.
Related
Migration works fine on Simulator. However on a device, I see no error messages but migrated store is empty.
NSDictionary *iCloudOptions = #{
NSPersistentStoreUbiquitousContentNameKey : #"iCloudNimbleStore",
NSPersistentStoreUbiquitousContentURLKey : #"transactions_logs",
NSMigratePersistentStoresAutomaticallyOption : #YES,
NSInferMappingModelAutomaticallyOption : #YES
};
NSDictionary *localOptions = #{NSMigratePersistentStoresAutomaticallyOption : #YES,
NSInferMappingModelAutomaticallyOption : #YES
};
if (![[NSFileManager defaultManager]fileExistsAtPath:self.storeURL.path]) {
#synchronized(#"Migration")
{
// thread-safe code
if ([[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil]) {
NSLog(#"iCloud");
[self migrateStoreFromURL:[self nb_URLToStoreWithFilename:[self nb_appName]]options:iCloudOptions];
}else{
[self migrateStoreFromURL:[self nb_URLToStoreWithFilename:[NSString stringWithFormat:#"%#.sqlite", [self nb_appName]]] options:localOptions];
//
[self migrateStoreFromURL:[self nb_URLToOldStoreWithFilename] options:localOptions];
}
}
}
NSDictionary *options = #{
NSMigratePersistentStoresAutomaticallyOption:#YES
,NSInferMappingModelAutomaticallyOption:#YES
};
NSError *error = nil;
[_coordinator lock];
_store = [_coordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:[self storeURL] options:options error:&error];
[_coordinator unlock];
if (!_store) {
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Loading Fail" message:[NSString stringWithFormat:#"Failed to add store. Error: %#", error] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
NSLog(#"Failed to add store. Error: %#", error);abort();
} else {
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Loading Success" message:[NSString stringWithFormat:#"Successfully added store: %#", _store] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
NSLog(#"Successfully added store: %#", _store);
if (_store && !error) {
// Encrypt the password database
NSError *encrError;
NSDictionary *fileAttributes = [NSDictionary dictionaryWithObject:NSFileProtectionComplete forKey:NSFileProtectionKey];
if (![[NSFileManager defaultManager] setAttributes:fileAttributes ofItemAtPath:self.storeURL.path error:&encrError]){
NSLog(#"Unresolved error with password store encryption %#, %#", encrError, [encrError userInfo]);
abort();
}else {NSLog(#"Encrypted");}
}
}
Here is migration procedure:
- (void)migrateStoreFromURL:(NSURL *)oldStoreURL options:(NSDictionary *)oldOptions{
if (debug==1) {
TFLog(#"Running %# '%#'", self.class, NSStringFromSelector(_cmd));
}
if (_store)
{
NSLog(#"NOT NEEDED");
return;
}
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Migration" message:[NSString stringWithFormat:#"Found old store at %#",oldStoreURL.path] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:self.storeURL.path]) {
NSDictionary *options =
#{
NSMigratePersistentStoresAutomaticallyOption:#YES
,NSInferMappingModelAutomaticallyOption:#YES
};
NSError *error = nil;
[_coordinator lock];
NSPersistentStore *srcPS = [_coordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:oldStoreURL
options:oldOptions
error:&error];
_store = [_coordinator migratePersistentStore:srcPS
toURL:self.storeURL
options:options
withType:NSSQLiteStoreType
error:&error];
[_coordinator unlock];
if (_store && !error) {
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Migration Success" message:[NSString stringWithFormat:#"Old store successfully migrated from %#",oldStoreURL.path] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
// Encrypt the password database
NSError *encrError;
NSDictionary *fileAttributes = [NSDictionary dictionaryWithObject:NSFileProtectionComplete forKey:NSFileProtectionKey];
if (![[NSFileManager defaultManager] setAttributes:fileAttributes ofItemAtPath:self.storeURL.path error:&encrError]){
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Encryption Error" message:[NSString stringWithFormat:#"Unresolved error with password store encryption %#, %#", encrError, [encrError userInfo]] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
}
}else{
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:#"Migration Error" message:error.localizedDescription delegate:nil cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
}
}
Upd.: I checked size of the newly migrated store and it's 0. Most strange is that _store && !error is true. I also tried to add NSPersistentStoreRemoveUbiquitousMetadataOption: #YES to migration options but it doesn't change anything.
Upd. 2 I think that on a device iCloud store url is nil before its loaded. I need some workaround to wait until its finished.
I'm not 100% sure I understand what you are trying to do with the migrations. It is common to seed data in an empty store with a migration, but it looks like you are trying to migrate data out of iCloud into your local store. Is that right? You should not need to do that. iCloud should automatically add the data from other devices to your store.
This line also doesn't look right:
NSPersistentStoreUbiquitousContentURLKey : #"transactions_logs",
I think you want to use a URL there that points to the transaction log directory inside the iCloud container. Eg.
NSURL *containerURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
NSURL *url = [containerURL URLByAppendingPathComponent:#"transactions_logs"];
When working with iCloud, it is important to realize that data does not transfer instantaneously. It can take a while to arrive, and your app doesn't really have any way to know for sure if there is data coming. You can monitor metadata with metadata queries, but even that often arrives some time after data on other devices has already been generated.
So simply looking in the ubiquity container for data will not help much, because there may or may not be data available. You just do not know, and you have to develop your approach with that assumption in mind, so that it can handle any delays.
The migrations required to get iCloud sync working with Core Data are messy and unnecessary. You are probably much more likely to get things working well with a framework that does that stuff automatically, such as Core Data Ensembles. (Disclosure: I am the developer of Ensembles.)
I am trying to code the login process for an iPhone app in XCode. The problem is with the NSString serverOutput below. When I print it using printf(serverOutput.UTF8String); it prints 'Yes' to the console. However when I compare serverOutput to "Yes" it doesn't work. Any help would be appreciated. Here's my code:
- (IBAction) loginButton: (id) sender
{
// TODO: spawn a login thread
indicator.hidden = FALSE;
[indicator startAnimating];
NSString *post =[NSString stringWithFormat:#"username=%#&password=%#",userName.text, password.text];
NSString *hostStr = #"http://10.243.1.184/connectDB.php?";
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL = [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
printf(serverOutput.UTF8String);
if([serverOutput isEqualToString:#"Yes"]){
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"Congrats" message:#"You are authorized"
delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alertsuccess show];
[alertsuccess release];
}
else {
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Username or Password Incorrect"
delegate:self cancelButtonTitle:#"OK"otherButtonTitles:nil, nil];
[alertsuccess show];
[alertsuccess release];
//[self.navigationController pushViewController:DashboardViewController animated:YES];
loginbutton.enabled = TRUE;
}
loginbutton.enabled = FALSE;
}
Based on helping others with similar situations I would say the problem is that the response from the server isn't just the string "Yes". Most likely there is some whitespace before and/or after the text. Perhaps a stray newline or two.
Try this:
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
NSLog(#"Result = '%#'", serverOutput); // look for space between quotes
serverOutput = [serverOutput stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
I am developing an app for my website that has an RSS Feed with a parser. I made a refresh button to look for new posts and it works. But now, I want it to display a UIAlertView that says "No posts found" if there were no new posts found.
This is my refresh button
- (IBAction)refreshButton:(UIBarButtonItem *)sender
{
// Create a new data container for the stuff that comes back from the service
xmlData = [[NSMutableData alloc] init];
// Construct a URL that will ask the service for what you want -
// Note we can concatenate literal strings together on multiple lines in this way it
// results in a single NSString instance
NSURL *url = [NSURL URLWithString:
#"http://sephardijews.com/feed/"];
// Putting the URL we made into an NSURLRequest, so we can connect to the url data that we specifed
NSURLRequest *req = [NSURLRequest requestWithURL:url];
// Creating a connecting that will exchange this request for the data from the URL we specifed
connection = [[NSURLConnection alloc] initWithRequest:req
delegate:self
startImmediately:YES];
[[self tableView] reloadData];
NSLog(#"%#\n %#\n %#\n", channel, [channel title], [channel infoString]);
}
How could I do this? Something with an if statement right?
The refresh button:
- (IBAction)refreshButton:(UIBarButtonItem *)sender
{
// Create a new data container for the stuff that comes back from the service
xmlData = [[NSMutableData alloc] init];
// Construct a URL that will ask the service for what you want -
// Note we can concatenate literal strings together on multiple lines in this way it
// results in a single NSString instance
NSURL *url = [NSURL URLWithString:
#"http://sephardijews.com/feed/"];
// Putting the URL we made into an NSURLRequest, so we can connect to the url data that we specifed
NSURLRequest *req = [NSURLRequest requestWithURL:url];
// Creating a connecting that will exchange this request for the data from the URL we specifed
connection = [[NSURLConnection alloc] initWithRequest:req
delegate:self
startImmediately:YES];
[[self tableView] reloadData];
NSLog(#"%#\n %#\n %#\n", channel, [channel title], [channel infoString]);
if ([[self tableView] numberOfRowsInSection:0] > someNumberVariableForLastCount) {
someNumberVariableForLastCount = [[self tableView] numberOfRowsInSection:0];
[[self tableView] reloadData];
}else{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"No New Posts" message:#"There were no new posts found" delegate:self cancelButtonTitle:#"Dismiss" otherButtonTitles:nil, nil];
[alert show];
}
}
Your reloadData call should occur in connectionDidFinishLoading, not right after you start the connection (it is an asynchronous network call, the table will be reloaded before anything is even fetched). The alert should be kicked off there too. You need to implement all the connection delegate stuff, hopefully you've done that. If not, basic example here.
This will compare the current row count in a section you specify to a variable for the last count:
if ([[self tableView] numberOfRowsInSection:0] > someNumberVariableForLastCount) {
someNumberVariableForLastCount = [[self tableView] numberOfRowsInSection:0];
[[self tableView] reloadData];
}else{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"no new items" message:#"OH NO!!" delegate:self cancelButtonTitle:#"Dismiss" otherButtonTitles:nil, nil];
[alert show];
}
I am doing a NSURLConnection that downloads a file only if there is a new one (checked with the last-modified date). But to accomplish this I am using two methods with two different NSURLRequests and NSURLConnection. Well, they do the same.
- (IBAction)uppdatera:(id)sender
{
checkHeaders = YES;
NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.forellgatan.se/site/ftp_files/Kapareskolan.zip"] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10.0];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection)
{
self.receivedData = [[NSMutableData data] retain];
}
else
{
UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:#"Ingen internetanslutning! 1" message:#"Anslut dig till internet för att ladda ner!" delegate: self cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[connectFailMessage show];
[connectFailMessage release];
}
}
- (void)downloadNewFile
{
NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.forellgatan.se/site/ftp_files/Kapareskolan.zip"] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10.0];
NSURLConnection *theConnection2 = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection2)
{
self.receivedData = [[NSMutableData data] retain];
}
else
{
UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:#"Ingen internetanslutning! 2" message:#"Anslut dig till internet för att ladda ner!" delegate: self cancelButtonTitle:#"Ok" otherButtonTitles: nil];
[connectFailMessage show];
[connectFailMessage release];
}
checkHeaders = NO;
self.progressView.hidden = NO;
}
It goes through the didReceiveResponse method:
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
if (checkHeaders == YES)
{
NSHTTPURLResponse *test = (NSHTTPURLResponse *)response;
if ([test respondsToSelector:#selector(allHeaderFields)])
{
NSDictionary *metaData = [test allHeaderFields];
NSString *lastModifiedString = [metaData objectForKey:#"Last-Modified"];
NSString *savedString = [[NSUserDefaults standardUserDefaults] stringForKey:#"LastModified"];
if (![lastModifiedString isEqualToString:savedString])
{
[self downloadNewFile];
}
else if ([lastModifiedString isEqualToString:savedString])
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Ingen uppdatering tillgänglig" message:#"Det finns ingen uppdatering att hämta just nu." delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[alert show];
[alert release];
}
NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];
[standardUserDefaults setObject:lastModifiedString forKey:#"LastModified"];
[standardUserDefaults synchronize];
}
}
[self.receivedData setLength:0];
self.fileSize = [[NSNumber numberWithLong: [response expectedContentLength]] retain];
}
Last the connectionDidFinishLaunching method:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if (checkHeaders == NO)
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
[self.receivedData writeToFile:[basePath stringByAppendingPathComponent:#"Kapareskolan.zip"] atomically:YES];
[self unzipDownloadedFile];
self.progressView.hidden = YES;
NSLog(#"Finished...");
}
[connection cancel];
}
I know the didFinishLaunching method gets called twice, but I want to know how I could get so the method doesn't get called twice if there is an update?
I know it's a lot asked and much code here but just give me a hint and I'll be very thankful.
If you're done with the first connection object in the didReceiveResponse method you should cancel it then. Otherwise it's going to make it to the connectionDidFinishLoading method.
I think this is what you want:
if (![lastModifiedString isEqualToString:savedString])
{
[connection cancel];
[self downloadNewFile];
}
Also It looks like you're setting checkHeaders to NO after you start the second request which could cause a race condition.
According to the programming guide, a connection "can be canceled any time before the delegate receives a connectionDidFinishLoading: or connection:didFailWithError: message by sending the connection a cancel message".
so why not try moving
[connection cancel];
from the connectionDidFinishLoading method to just after your if-else block in the didReceiveResponse delegate method? You want to cancel the "checkHeaders==YES" connection in either case; either you're about to kick off a new connection, or you already know all you need to know about the current connection.
UPDATED as requested:
if (![lastModifiedString isEqualToString:savedString]) {
[self downloadNewFile];
} else { // you've already implicitly checked for equality above
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Ingen uppdatering tillgänglig" message:#"Det finns ingen uppdatering att hämta just nu." delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[alert show];
[alert release];
}
// you've used the connection for everything that you need, so cancel it in either case
[connection cancel];
as downloadNewFile kicks off its NSURLConnection asynchronously, this should be okay in the event that the two strings are equal. Slightly safer would be to move the cancel method call to just prior to the if-else check.
Im trying to create a iPhone Objective C login page using PHP/MySQL to authenticate. Im trying to use HTTP responses as a way of authenticating. Right now it always fails to login , regardless of what you enter.
`- (IBAction) login: (id) sender
{
// this part isnt really implemented yet!
NSString *post =[NSString stringWithFormat:#"username=%#&password=%#",usernameField.text, passwordField.text];
NSURL *url = [NSURL URLWithString:#"MY URL HERE.php"];
NSURLRequest *request = [NSURLRequest requestWithURL: url];
NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)request;
responseStatusCode = [httpResponse statusCode];
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:response error:nil];
if ([responseStatusCode statusCode] == 200) {
//do something
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"success" message:#"Your have logged in" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes", nil];
[alertsuccess show];
[alertsuccess release];
}
else {
NSLog(#"Login failed.");
//do something else
UIAlertView *alertfail = [[UIAlertView alloc] initWithTitle:#"fail" message:#"login fail" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes", nil];
[alertfail show];
[alertfail release];
}
`
and the PHP looks like
<?
session_start();
require("iphoneconnection.php");
$u = $_POST['username'];
$pw = $_POST['password'];
$check = "SELECT username, password FROM iphoneusers WHERE username='$u' AND password= '$pw'";
$login = mysql_query($check, $connect) or die(mysql_error());
// check user level and store in $row
if (mysql_num_rows($login) == 1) {
$row = mysql_fetch_assoc($login);
//$_SESSION['level'] = $row['level'];
$_SESSION['username'] = $u;
echo 'login success';
header("HTTP/1.1 200 OK");
//header("Location: index.php");
} else {
//header("Location: login.php");
//echo '403 Forbidden';
header("403 Forbidden");
}
mysql_close($connect);
?>
Anyone got any pointers? Even if its just to tell me if Im formatting my repsonses correctly in the PHP.
Thanks in advance.
Thanks for the response. I got it to work using:
- (IBAction) login: (id) sender
{
NSString *post =[NSString stringWithFormat:#"username=%#&password=%#",usernameField.text, passwordField.text];
NSString *hostStr = #"MY URL.php?";
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL = [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
if([serverOutput isEqualToString:#"Yes"]){
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"success" message:#"You are authorized"
delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes", nil];
[alertsuccess show];
[alertsuccess release];
} else {
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"Fail" message:#"Invalid Access"
delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes", nil];
[alertsuccess show];
[alertsuccess release];
}
loginIndicator.hidden = FALSE;
[loginIndicator startAnimating];
loginButton.enabled = FALSE;
}
According to the sample you've given, I don't see that you're actually sending the username & password with the request. You're creating a string "post", but never including it in the request.
Also, this cast:
NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)request;
doesn't look right. Why are you typecasting the request object to a response?