Coding was found here!
Hi all.
In objective C, I am trying to download a file from the net and save it, however I also a require a time stamp! dd'mm'yy format!
Can anyone help?
N*SString*stringURL =#"http://www.somewhere.com/thefile.png";
NSURL *url =[NSURL URLWithString:stringURL];
NSData*urlData =[NSData dataWithContentsOfURL:url];
if( urlData )
{
NSArray *paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory =[paths objectAtIndex:0];
NSString *filePath =[NSString stringWithFormat:#"%#/%#", documentsDirectory,#"filename.png"];
[urlData writeToFile:filePath atomically:YES];
}*
You can use this to get a timestamp as a string
NSDateFormatter *inFormat = [[NSDateFormatter alloc] init];
[inFormat setDateFormat:#"dd\\'MM\\'yy"];
NSString *parsed = [inFormat stringFromDate:[NSDate date]];
[inFormat release];
Not sure about the apostrophes, though. There may be cleaner ways instead of using the alloc calls but this should work and won't leak.
Related
I'm trying to make an xcode plugin that needs to write something to the .h file from the .m file. I haven't been able to find a stackoverflow post with an answer on how to do this. I've tried this code
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSString *contents = [[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding];
I've also tried using the StringWithContentsOfFile method, however they both return nil. Is it because you can't read an .h file with this code or is it something else I'm missing.
filePath is this and it's a correct filepath, my ftp client can read it atleast file:///Users/myUserName/Documents/code/macOsDev/XcodePlugIns/XcoderPlugin/XcoderPlugin/XcoderPlugin.h
So my question is, how do I read and write to a .h file? Thanks in advance.
EDIT as requested, some more code however this is as far as I've gotten to the read/write part of my plugin.
NSString *filePath = path;
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSString *contents = [[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding];
NSError *error;
NSString *contents1 = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
contents is #"" because data is nil
and contents1 is just nil;
error is error
NSError * domain: #"NSCocoaErrorDomain" - code: 260
in the debugger, but I'm not sure I'm using this error thing correctly.
Use "/Users/myUserName/Documents/code/macOsDev/XcodePlugIns/XcoderPlugin/XcoderPlugin/XcoderPlugin.h".
Dont use 'file://' prefix
Following is the code for reading and writing
NSString *path = #"your/path/tp/.h/file";
NSData *data = [NSData dataWithContentsOfFile:path];
//Get the contents of the file into the mutable string
NSMutableString *contents = [[NSMutableString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding];
//Make changes to your mutable string
[contents appendString:#"abc"];
//Write it back to the file
[contents writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];
This question already has answers here:
Working with data in iOS Apps (What to choose? NSData, CoreData, sqlite, PList, NSUserDefaults)
(2 answers)
Closed 9 years ago.
I've been struggling with this for ages now and I really need some good help here. :)
I have an app where I'm parsing a quite big JSON into appdelegate's didFinishLaunchingWithOptions.
My Model Objects are:
Tab:
NSString *title
NSMutableArray *categories
Category:
NSString *title
NSMutableArray *items
Item
NSString *title
NSString *description
UIImage *image
I need to save the data locally, cause the parsing takes about 15 seconds every time my app starts. I'm using the SBJSON framework.
Here's my code for parsing:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"json_template" ofType:#"json"];
NSString *contents = [NSString stringWithContentsOfFile: filePath encoding: NSUTF8StringEncoding error: nil];
SBJsonParser *jsonParser = [[SBJsonParser alloc] init];
NSMutableDictionary *json = [jsonParser objectWithString: contents];
tabs = [[NSMutableArray alloc] init];
jsonParser = nil;
for (NSString *tab in json)
{
Tab *tabObj = [[Tab alloc] init];
tabObj.title = tab;
NSDictionary *categoryDict = [[json valueForKey: tabObj.title] objectAtIndex: 0];
for (NSString *key in categoryDict)
{
Category *catObj = [[Category alloc] init];
catObj.name = key;
NSArray *items = [categoryDict objectForKey:key];
for (NSDictionary *dict in items)
{
Item *item = [[Item alloc] init];
item.title = [dict objectForKey: #"title"];
item.desc = [dict objectForKey: #"description"];
item.url = [dict objectForKey: #"url"];
if([dict objectForKey: #"image"] != [NSNull null])
{
NSURL *imgUrl = [NSURL URLWithString: [dict objectForKey: #"image"]];
NSData *imageData = [NSData dataWithContentsOfURL: imgUrl];
item.image = [UIImage imageWithData: imageData];
}
else
{
UIImage *image = [UIImage imageNamed: #"standard.png"];
item.image = image;
}
[catObj.items addObject: item];
}
[tabObj.categories addObject: catObj];
}
[tabs addObject: tabObj];
}
What is the best way of doing this? Using Core Data or NSFileManager?
If you have som code example too it will make me very happy.
This is the last thing i need to fix before the app is ready for app store and it just kills me! I can't solve this problem.
If you are working on iOS then you save a file to the Documents folder. On Mac OS X it would be in the Application Support folder. Since you are on iOS, read this answer for how to access the Documents folder.
All of the objects that you want to store should implement NSCoding. The above variables already do. Should you want to store the tabs, categories and items directly they would need to implement NSCoding. Then all you need is to serialize them to a file. When opening you app you can look for this file and get your objects back without parsing.
The code should look something like this (untested and error checking is ommited for brevity):
- (void) saveStateToDocumentNamed:(NSString*)docName
{
NSError *error;
NSFileManager *fileMan = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [paths[0] stringByAppendingPathComponent:docName];
if ([fileMan fileExistsAtPath:docPath])
[fileMan removeItemAtPath:docPath error:&error];
// Create the dictionary with all the stuff you want to store locally
NSDictionary *state = #{ ... };
// There are many ways to write the state to a file. This is the simplest
// but lacks error checking and recovery options.
[NSKeyedArchiver archiveRootObject:state toFile:docPath];
}
- (NSDictionary*) stateFromDocumentNamed:(NSString*)docName
{
NSError *error;
NSFileManager *fileMan = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [paths[0] stringByAppendingPathComponent:docName];
if ([fileMan fileExistsAtPath:docPath])
return [NSKeyedUnarchiver unarchiveObjectWithFile:docPath];
return nil;
}
hello I am trying to create a text file that will then store some data
- (IBAction)saveUser:(id)sender{
NSString *name = [nameField stringValue];
NSString *weight = [weightField stringValue];
NSDate *date = [datePick dateValue];
}
I want to be able to create a file that stores the following information and uses the name field as the name of the file. I also want to be able to load the file and read that data from it
Any help is appreciated
Thanking You
This is quite simple. But you might want to look into NSMutableDictionary instead. Both NSString and Dictionary have methods writeToFile:#"filename.txt".
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setValue:[nameField stringValue] forKey:#"name"];
[dict setValue:[weightField stringValue] forKey:#"weight"];
[dict setValue:date forKey:#"date"];
[dict writeToFile:name atomically:YES];
you read from the file the same way,
NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithContentsOfFile:name];
As simple as it gets
I think you may get some informations from class NSFileManager, such as like this,
[fileManager createFileAtPath:filePath contents:contentData attributes:NULL];
the contentData is NSData, and it includes the content of what you want to save, the filename is in filePath that you need to set.
Thanks!
I'm trying to write a string to a file and store that in the applicationSupport folder within my app. But my NSLog() statement doesn't log anything in the debugger. I have tried to go through it with the debugger, and i can see that the content is nil, so i'm guessing that's why it's not outputting anything, but i don't know why it's set to nil. Can anybody see my mistake?
NSString *document = [[[[[[[[description stringByAppendingString:#" "]stringByAppendingString:focus]stringByAppendingString:#" "]stringByAppendingString:level]stringByAppendingString:#" "]stringByAppendingString:equipment]stringByAppendingString:#" "]stringByAppendingString:waterDepth];
//NSLog(#"%#", document);
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *supportDirectory = [paths objectAtIndex:0];
//filename
NSString *filename = [NSString stringWithFormat:[_nameTextField.text stringByAppendingString:#".txt"], supportDirectory];
[document writeToFile:filename atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];
NSString *content = [[NSString alloc]initWithContentsOfFile:filename usedEncoding:nil error:nil];
NSLog(#"%#", content);
filename is wrong. It should have the following format: "directory/file.extension". You can use the methods stringByAppendingPathComponent and stringByAppendingPathExtension to construct such a string.
NSString *filename = [supportDirectory stringByAppendingPathComponent:[_nameTextField.text stringByAppendingPathExtension:#"txt"]];
Also, as a side note, the first line should be rewritten using stringWithFormat like this:
NSString *document = [NSString stringWithFormat:#"%# %# %# %# %#", description, focus, level, equipment, waterDepth];
You have wrong initialize filename. It should be:
NSString *filename = [NSString stringWithFormat:#"%#/%#", supportDirectory,[_nameTextField.text stringByAppendingString:#".txt"]];
it will works! Good luck:)
The
NSString *filename = [NSString stringWithFormat:[_nameTextField.text stringByAppendingString:#".txt"], supportDirectory];
is wrong. It should be:
NSString *filename = [NSString stringWithFormat:"%#%#",[_nameTextField.text stringByAppendingString:#".txt"], supportDirectory];
i have a local html file that i can display on UIWebview now is there a way like i can pass my string value to that html page and display the content???
this is how i am loading html
NSString *urlAddress = [[NSBundle mainBundle] pathForResource:#"index4" ofType:#"html"];
NSURL *instructionsURLd = [[NSURL alloc] initFileURLWithPath:urlAddress];
[webView loadRequest:[NSURLRequest requestWithURL:instructionsURLd]];
now index4.html content is
<html>
<body>
testing hhhhhhhhhhhhhhhhhhhhhhhhhhhhh
index1
<TD><INPUT TYPE=BUTTON OnClick="Circle_calc(this.form);" VALUE="calculate"></TD>
</body>
</html>
//
now lets say i have NSString s=#"hello"
now can i add this value to the < body > tag of html and show in UIwebview??
You cannot store mutable (changing) objects in your application bundle. However, you can put them there before building you app, open them when the app is executing, and write them to disk, and modify them whenever you want, after that.
Your code
NSString *s;
s = #"hello";
NSString *urlAddress = [[NSBundle mainBundle] pathForResource:#"index4" ofType:#"html"];
NSURL *instructionsURLd = [[NSURL alloc] initFileURLWithPath:urlAddress];
NSError *error;
When your starts for the first time only Grab the resource and store it into a string
NSString *myHTML = [NSString stringWithContentsOfURL:instructionsURLd encoding:NSASCIIEncoding error:&error];
Immediately write the data to disk
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSData *myData = [NSData dataWithBytes:[myHTML UTF8String] length:[myHTML lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:#"index4.html"];
[myData writeToFile:appFile atomically:YES];
Then, load it when you need it
NSArray *paths2 = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory2 = [paths2 objectAtIndex:0];
NSString *appFile2 = [documentsDirectory2 stringByAppendingPathComponent:#"index4.html"];
NSData *mySavedData = [[[NSData alloc] initWithContentsOfFile:appFile2] autorelease];
NSString *myNewHTML = [[NSString alloc] initWithData:mySavedData encoding:NSUTF8StringEncoding];
Insert s into the HTML document
myNewHTML = [myHTML stringByReplacingOccurrencesOfString:#"<body>" withString:[NSString stringWithFormat:#"<body> %#",s]];
Write everything back to the file
NSArray *paths3 = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory3 = [paths objectAtIndex:0];
NSMutableData *myData3 = [NSData dataWithBytes:[myNewHTML UTF8String] length:[myNewHTML lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
NSString *appFile3 = [documentsDirectory3 stringByAppendingPathComponent:#"index4.html"];
NSData *myNewData = [NSData dataWithBytes:[myNewHTML UTF8String] length:[myNewHTML lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
[myNewData writeToFile:appFile3 atomically:YES];
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You can simply do this by creating javascript method in HTML and then call it via IOS if you want to pass that string to html from IOS