I have a UITextView which I have created programmatically in the following code:
NSLog(#"creating the first blurb");
blurb = [[UITextView alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
[blurb setText:total];
blurb.backgroundColor = [UIColor redColor];
where blurb is defined as a UITextView in the #interface.
Here's where I'm having the problem:
total is an NSString that is defined to get the text from a .txt file from a specified domain.
It is mutated as:
NSString *url = #"https://sites.google.com/site/paloaltoapps/tbnappsource-password-blackr3d/Updates.txt";
NSURL *urlRequest = [NSURL URLWithString:url];
total = [NSString stringWithContentsOfURL:urlRequest encoding:NSUTF8StringEncoding error:nil];
However, when I run the code, I get an instance of EXC_BAD_ACCESS thrown at the setText: line of the top code block.
I have tried printing total out using an NSLog statement, and that seems to work just fine.
Can anyone see what I'm doing wrong? Thanks.
try this... May be it lose reference......
total = [[NSString stringWithContentsOfURL:urlRequest encoding:NSUTF8StringEncoding error:nil]copy];
Why not trying to create an NSString and assign the text to that. And then you can try to print the NSString and see if that works. Just a suggestion.
Related
Im trying to read some values from a local url when i press a button and i send the value to a label. as soon as i launch the app and i press the button for the first time i get the value. but the second time i press the button the label get no text even though the NSLog message continues to display the value. any idea?
here is the code:
- (IBAction)refresh:(id)sender {
NSArray *listItems;
NSString *msg;
NSStringEncoding encoding;
NSURL *url = [NSURL URLWithString:#"http://192.168.1.177"];
NSData *data = [NSData dataWithContentsOfURL:url];
msg = [[NSString alloc] initWithData:data encoding:encoding];
listItems = [msg componentsSeparatedByString:#" "];
label.text = listItems[0];
NSLog(listItems[0]);
}
Your encoding variable is never initialized with a value, so it has the default value of 0, which is not a valid value of NSStringEncoding according to NSString.h. If you run the static analyzer (Command-Shift-B in Xcode), you will get a message that has an uninitialized value when it is used.
Change this line:
msg = [[NSString alloc] initWithData:data encoding:encoding];
to this:
msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
(Substitute the appropriate encoding, but NSUTF8StringEncoding is a good first guess.)
You should also use a format string to log:
NSLog(#"%#", listItems[0]);
I have implemented the PinInterest through web view using this code:
NSString *description = #"Post your description here";
NSURL* sUrl = [NSString stringWithFormat:#"http://4.bp.blogspot.com/-w4oTZjlpgwo/T5_pi-KJPuI/AAAAAAAAAoM/rKm3E0XCbgY/s1600/red_rose_flower3.jpg"];// pass your link here with your image name
// NSLog(#"URL:%#", sUrl);
NSString *protectedUrl = ( NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL,( CFStringRef)sUrl, NULL, (CFStringRef)#"!*'\"();:#&=+$,/?%#[]% ",CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding)));
NSLog(#"Protected URL:%#", protectedUrl);
NSString *imageUrl = [NSString stringWithFormat:#"\"%#\"", sUrl];
imageUrl=[[NSBundle mainBundle]pathForResource:mAppDelegate.imagename ofType:nil];
NSString *buttonUrl = [NSString stringWithFormat:#"\"http://pinterest.com/pin/create/button/?url=www.flor.com&media=%#&description=%#\"", protectedUrl, description];
NSMutableString *htmlString = [[NSMutableString alloc] initWithCapacity:1000];
[htmlString appendFormat:#"<html> <body>"];
[htmlString appendFormat:#"<p align=\"center\"><img border=\"0\" src=\"http://assets.pinterest.com/images/PinExt.png\" title=\"Pin It\" /></p>", buttonUrl];
[htmlString appendFormat:#"<p align=\"center\"><img width=\"300px\" height = \"400px\" src=%#></img></p>", imageUrl];
[htmlString appendFormat:#"<script type=\"text/javascript\" src=\"//assets.pinterest.com/js/pinit.js\"></script>"];
[htmlString appendFormat:#"</body> </html>"];
return htmlString;
And I have also tried using PinInterest iOS SDK, but all I found is that can only pin the image from url.
And I need to pin image from local bundle image. Any help will be greatly appreciated.
Read the document once, they said Right now, "we only support pinning an image from a url. In the future, we’ll add support for pinning local images." i think this answers your question. for more clarification reed this. hope this helps :)
I have a Text file and it has lot of lines How can i get last 'n' number of lines from the text file? and Can we give Numbers in the text file for each file How can we get it.
You could use NSFileHandle, seekToEndOfFile and then work backwards from the offsetInFile using seekToFileOffset: and readDataOfLength: scanning the data read each time for carriage returns and counting them until you get to the required number. As you go you can build up the text after each scan.
One way is putting \n to separate your different lines in the text file. Then
NSString* path = [[NSBundle mainBundle] pathForResource:#"filename"
ofType:#"txt"];
NSString* content = [NSString stringWithContentsOfFile:path
encoding:NSUTF8StringEncoding
error:NULL];
NSArray* lines = [content componentsSeparatedByString: #"\n"];
Then you can take the last few elements in the array.
Hope this helps..
Try to use this one:
NSString* textFile = [[NSBundle mainBundle]
pathForResource:#"fileName" ofType:#"txt"];
NSString* fileContents = [NSString stringWithContentsOfFile: textFile
encoding: NSUTF8StringEncoding error: nil];
Separate by new line
NSArray* allLinedStrings =
[fileContents componentsSeparatedByCharactersInSet:
[NSCharacterSet newlineCharacterSet]];
Here you can get your last 100 objects
NSString* oneLineStr;
for (int i = allLinedStrings.count - 100; i < allLinedStrings.count; i++)
{
oneLineStr = [allLinedStrings objectAtIndex: i];
NSLog#("New Line %#", oneLineStr);
}
In my app, I have a view where user have to fill a form. But, sometime the app crash here, in this function, that simple cacth the value field and built a url to give
-(NSString*)urlToUpload{
NSString *string1 =[[NSString alloc]init];
string1= [NSString stringWithFormat:#"?nombre="];
NSString *string2 = [string1 stringByAppendingString:nameAdded];
//crash here
NSString *string3 = [string2 stringByAppendingString:#"&horario="];
NSString *string4 = [string3 stringByAppendingString:horarioAdded];
NSString *string5 = [string4 stringByAppendingString:#"&info="];
NSString *string6 = [string5 stringByAppendingString:infoAdded];
NSString *string7 = [string6 stringByAppendingString:#"&offerta="];
NSString *string8 = [string7 stringByAppendingString:offertaAdded];
NSString *lat_string = [[[NSString alloc] initWithFormat:#"%f",locationToUpload2.latitude] autorelease];
NSString *lon_string = [[[NSString alloc] initWithFormat:#"%f",locationToUpload2.longitude] autorelease];
NSString *string9 = [string8 stringByAppendingString:#"&latitude="];
NSString *string10 = [string9 stringByAppendingString:lat_string];
NSString *string11 = [string10 stringByAppendingString:#"&longitude="];
NSString *string12 = [string11 stringByAppendingString:lon_string];
NSString *url1 = [NSString stringWithFormat:#"http://myserverside/mysql_up.php"];
NSString *url = [url1 stringByAppendingString:string12];
return url;
}
EDIT:
It seems problem appers on nameAdded when there is a white space into textField(i.e. MisterB not crash, Mister B yes ).
But I am using:
nameAdded =[[nameField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
and NSLOg give of nameAdded is Mister%20B.
The crash still appearing...
Just use a single stringWithFormat::
- (NSString *)urlToUpload {
NSString *url = [NSString stringWithFormat:#"http://myserverside/mysql_up.php?nombre=%#&horario=%#&info=%#&offerta=%#&latitude=%f&longitude=%f",
[nameAdded stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
[horarioAdded stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
[infoAdded stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
[offertaAdded stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
locationToUpload2.latitude, locationToUpload2.longitude];
return url;
}
Make sure the referenced variables are valid.
In your original code there is no need to alloc/init an NSString then assign another string to the same variable. That's a memory leak (string1).
If you really want to structure your code the way you have it, at least use an NSMutableString and append to that one mutable string. Creating over a dozen NSString variables is the wrong way to do it.
Updated: Ensure each of the strings added to the URL are properly escaped.
It looks like nameAdded may be the cause of your problems. Is it nil at that point?
Also
You are allocating a string, setting it to string1 and then immediately setting string1 to the class function stringWithFormat which allocates another string. Also you are using stringWithFormat but you aren't using any format so you could simply use NSString *string1 = #"?nombre=";
Rather than declaring all of those variables you should just use NSMutableString and build it all in one variabl
I have NSMutableArray* cityData that I fill with custom LocationDetail objects. cityData is created in viewDidLoad and released in dealloc.
Somewhere in the code, based on user actions, I populate LocationDetail and add it to cityData array:
LocationDetail* d = [[LocationDetail alloc] init];
d.city = [NSString stringWithFormat:#"%S", (char*)sqlite3_column_text16(statement, 1)];
d.tz = [NSString stringWithFormat:#"%S", (char*)sqlite3_column_text16(statement, 3)];
d.country = [NSString stringWithFormat:#"%S", (char*)sqlite3_column_text16(statement, 2)];
d._id = [NSString stringWithFormat:#"%S", (char*)sqlite3_column_text16(statement, 0)];
[cityData addObject:d];
[d release];
When I am finished with the view controller and remove it, Leaks utility says I have a leak in the code above in NSCFString in all 4 lines with [NSString stringWithFormat] above.
I tried removing the sqlite3 stuff and simplified the call to something like
d._id = [NSString stringWithFormat:#"%s", "a string"]
with the same result. However, if I replace the NSString stringWithFormat like this:
d._id = #"a string";
the leak goes away. I wonder why there is a leak if I use the stringWithFormat, but not if I use #"something". Is there anything obvious that I'm doing wrong?
Thanks!
Properties are not automatically released for you, you need to do that yourself in
- (void)dealloc
See The Objective-C Programming Language: Declared Properties for an example.
Edit:
It seems that the example was moved into the Advanced Memory Management Programming Guide.