I am using following code to download an slqite file and storing it
self.responseData = NSMutableData
I receive responseData = 2048bytes. working well.
However white writing it does create a file myFile.sqlite but it is of Zero bytes.
What is wrong?
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *dbPath = [self getDBPath];
BOOL success = [fileManager fileExistsAtPath:dbPath];
if(!success)
{
if(self.responseData)
{
dbPath = [dbPath stringByAppendingPathComponent:[self.selectedBtn.dbPath lastPathComponent]];
[self.responseData writeToFile:dbPath atomically:YES];
[self performSegueWithIdentifier:#"list" sender:self];
}
}
[self.alertView removeFromSuperview];
}
-(NSString *) getDBPath
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSURL *url = [[NSURL alloc] initWithString:[self.selectedBtn.dbPath lastPathComponent]];
return [documentsDir stringByAppendingPathComponent:[url lastPathComponent]];
}
I am getting error
`The operation couldn’t be completed. (Cocoa error 4.)`
dbPath : /Users/umar/Library/Application Support/iPhone Simulator/6.1/Applications/00027635-CE9C-48C3-8000-64CA1E6532F1/Documents/music.sqlite/music.sqlite
You are appending [self.selectedBtn.dbPath lastPathComponent] twice, once in getDBPath, and again ion connctionDidFinishLoading.
Pick one of those instances to remove.
Documents/music.sqlite/music.sqlite
Nah, this is not a valid path... You meant Documents/music.sqlite, didn't you? Also, I don't see why you're raping poor NSURL for an unrelated task.
return [documentsDir stringByAppendingPathComponent:[self.selectedBtn.dbPath lastPathComponent]];
Also, make sure self.selectedBtn.dbPath also is indeed a valid path and not junk (I could imagine it is).
Related
I am trying to save a plain text file to the Documents directory in iOS 7. Here is my code:
//Saving file
NSFileManager *fileManager = [[NSFileManager alloc] init];
NSArray *urls = [fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];
NSString *url = [NSString stringWithFormat:#"%#", urls[0]];
NSString *someText = #"Random Text To Be Saved";
NSString *destination = [url stringByAppendingPathComponent:#"File.txt"];
NSError *error = nil;
BOOL succeeded = [someText writeToFile:destination atomically:YES encoding:NSUTF8StringEncoding error:&error];
if (succeeded) {
NSLog(#"Success at: %#",destination);
} else {
NSLog(#"Failed to store. Error: %#",error);
}
Here is the error I am getting:
2013-10-13 16:09:13.848 SavingFileTest[13675:a0b] Failed to store. Error: Error Domain=NSCocoaErrorDomain Code=4 "The operation couldn’t be completed. (Cocoa error 4.)" UserInfo=0x1090895f0 {NSFilePath=file:/Users/Username/Library/Application%20Support/iPhone%20Simulator/7.0-64/Applications/F5DA3E33-80F7-439B-A9AF-E8C7FC4E1630/Documents/File.txt, NSUserStringVariant=Folder, NSUnderlyingError=0x10902aeb0 "The operation couldn’t be completed. No such file or directory"}
I can't figure out why I am getting this error running on the simulator. This works if I use the NSTemporaryDirectory().
From Apple's Xcode Template:
/**
Returns the URL to the application's Documents directory.
*/
- (NSURL *)applicationDocumentsDirectory {
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory
inDomains:NSUserDomainMask] lastObject];
}
You can save like this:
NSString *path = [[self applicationDocumentsDirectory].path
stringByAppendingPathComponent:#"fileName.txt"];
[sampleText writeToFile:path atomically:YES
encoding:NSUTF8StringEncoding error:nil];
Mundi's answer in Swift:
let fileName = "/File Name.txt"
let filePath = self.applicationDocumentsDirectory().path?.stringByAppendingString(fileName)
do {
try strFileContents.writeToFile(filePath!, atomically: true, encoding: NSUTF8StringEncoding)
print(filePath)
}
catch {
// error saving file
}
func applicationDocumentsDirectory() -> NSURL {
return NSFileManager.defaultManager().URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask).last!
}
-(void)writeATEndOfFile:(NSString *)content2
{
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/textfile.txt",
documentsDirectory];
if([[NSFileManager defaultManager] fileExistsAtPath:fileName])
{
NSFileHandle *fileHandle = [NSFileHandle fileHandleForWritingAtPath:fileName];
[fileHandle seekToEndOfFile];
NSString *writedStr = [[NSString alloc]initWithContentsOfFile:fileName encoding:NSUTF8StringEncoding error:nil];
content2 = [content2 stringByAppendingString:#"\n"];
writedStr = [writedStr stringByAppendingString:content2];
[writedStr writeToFile:fileName
atomically:NO
encoding:NSStringEncodingConversionAllowLossy
error:nil];
}
else {
int n = [content2 intValue];
[self writeToTextFile:n];
}
}
-(void) writeToTextFile:(int) value{
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/textfile.txt",
documentsDirectory];
//create content - four lines of text
// NSString *content = #"One\nTwo\nThree\nFour\nFive";
NSString *content2 = [NSString stringWithFormat:#"%d",value];
content = [content2 stringByAppendingString:#"\n"];
//save content to the documents directory
[content writeToFile:fileName
atomically:NO
encoding:NSStringEncodingConversionAllowLossy
error:nil];
}
How can i replace the database (with the one i am working on) in my app on each simulator run? (Still adding data and want to check that it looks good)
I tried this but it doesn't seem to be working, still using the old database:
- (void)viewDidLoad
{
dbname = #"animaldatabase.sql";
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
dbpath = [documentsDir stringByAppendingPathComponent:dbname];
[self checkAndCreateDatabase];
[self readAnimalsFromDatabase];
[super viewDidLoad];
// Do any additional setup after loading the view.
mylabel.text = [NSString stringWithFormat:#"%d", [animals count]];
}
- (void) checkAndCreateDatabase{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
success = [fileManager fileExistsAtPath:dbpath];
if (success) {
//return;
[fileManager removeItemAtPath:dbpath error:nil];
}
NSString *dbPathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:dbname];
[fileManager copyItemAtPath:dbPathFromApp toPath:dbpath error:nil];
}
Also where is the location for the iphone database? When my app copies the database into the iphone, where does it end up?
UPDATE
Added the loading code as well.
Senthilkumar:
I fail to see how this should solve the problem? Doesn't this just skip the copying or my database if it already exists?
What i want is to delete the database in my iphone app. Import the new database and then run it.
use the following code instead of that.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
databaseName=#"yourfileName.sqlite";
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
[self checkAndCreateDatabase];
}
-(void) checkAndCreateDatabase {
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
success = [fileManager fileExistsAtPath:databasePath];
if(success) return;
else
printf("NO File found");
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
}
To help debug file manager operations, it helps to try and use the error parameter, like so:
NSError* error;
[fileManager copyItemAtPath:dbPathFromApp toPath:dbpath error: &error];
if (error != nil) {
NSLog(#"copyItemAtPath generated error=%#", [error localizedDescription]);
}
If you do this, the error message will get written to your debugger console / standard output window.
I am using fmdb but i am not knowing where to add the db file.
I found this old answer that i think it doesn't fit for xcode 4.2 (since we dont have 'Resources' folder anymore).
I created a database in 'Lita', added the extension .sqlite and added the db file as follows :
then tried to use the following
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsPath = [paths objectAtIndex:0];
NSString *path = [docsPath stringByAppendingPathComponent:#"db.sqlite"];
FMDatabase *database = [FMDatabase databaseWithPath:path];
[database open];
FMResultSet *results = [database executeQuery:#"select * from tbl"];
printf("hi");
while([results next]) {
printf("hi2");
NSString *name = [results stringForColumn:#"clm1"];
NSString *text = [results stringForColumn:#"clm2"];
NSLog(#"test: %# - %#",name, text);
}
printf("done");
i am getting the 'hi' 'done' but never 'hi2'...
anyone can help?
You want to add the (compiled) database to the project as a resource, and then copy it into the documents folder of the app on first start-up.
Here is an example method that does the work, call it from the applicationDidFinishLaunching and use the resultant FMDatabase * for all you queries.
- (FMDatabase *)openDatabase
{
NSFileManager *fm = [NSFileManager defaultManager];
NSString *documents_dir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *db_path = [documents_dir stringByAppendingPathComponent:[NSString stringWithFormat:#"database.s3db"]];
NSString *template_path = [[NSBundle mainBundle] pathForResource:#"template_db" ofType:#"s3db"];
if (![fm fileExistsAtPath:db_path])
[fm copyItemAtPath:template_path toPath:db_path error:nil];
FMDatabase *db = [FMDatabase databaseWithPath:db_path];
if (![db open])
NSLog(#"Failed to open database!");
return db;
}
I am working with the same issues right now. But to answer your question: the documents folder is the folder that is to be used in the device.
Put the database in the the supporting files folder.
Here is what works for me:
//hide status bar for full screen view
[[UIApplication sharedApplication]setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
//set reference to database here
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [documentPaths objectAtIndex:0];
self.databasePath = [documentDir stringByAppendingPathComponent:#"RPRA.sqlite"];
[self createAndCheckDatabase];
// Override point for customization after application launch.
return YES;
}
//method used to create database and check if it exists
-(void) createAndCheckDatabase
{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
success = [fileManager fileExistsAtPath:self.databasePath];
if(success) return;
//else move database into documents folder
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath]
stringByAppendingPathComponent:#"RPRA.db"];
[fileManager copyItemAtPath:databasePathFromApp toPath:self.databasePath error:nil];
}
- (void)ensureDBFile
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dbFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"retails.sqlite"]];
NSLog(#"Database Filepath Delgate = %#", dbFilePath);
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL dbFileExists = [fileManager fileExistsAtPath:dbFilePath];
if(!dbFileExists){
//Copy the db file if it didn't exist
NSString *bundledDbPath = [[NSBundle mainBundle] pathForResource:#"retails" ofType:#"sqlite"];
if (bundledDbPath != nil) {
BOOL copiedDbFile = [fileManager copyItemAtPath:bundledDbPath toPath:dbFilePath error:nil];
if (!copiedDbFile) {
NSLog(#"Error: Couldn't copy the db file from the bundle");
}
}
else {
NSLog(#"Error: Couldn't find the db file in the bundle");
}
}
self.db = [FMDatabase databaseWithPath:dbFilePath];
[self.db setShouldCacheStatements:NO];
[self.db open];
if([self.db hadError]) {
NSLog(#"Database Error %d: %#", [self.db lastErrorCode], [self.db lastErrorMessage]);
}
}
I am trying to write a very basic text string to my documents directory and work from there to later save other files etc.
I am currently stuck with it not writing anything into my Documents directory
(In my viewDidLoad)
NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)
NSString *documentsDirectory = [pathArray objectAtIndex:0];
NSString *textPath = [documentsDirectory stringByAppendingPathComponent:#"file1.txt"];
NSString *text = #"My cool text message";
[[NSFileManager defaultManager] createFileAtPath:textPath contents:nil attributes:nil];
[text writeToFile:textPath atomically:NO encoding:NSUTF8StringEncoding error:NULL];
NSLog(#"Text file data: %#",[[NSFileManager defaultManager] contentsAtPath:textPath]);
This is what gets printed out:
2011-06-27 19:04:43.485 MyApp[5731:707] Text file data: (null)
If I try this, it also prints out null:
NSLog(#"My Documents: %#", [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:NULL]);
What have I missed or am I doing wrong while writing to this file?
Might it be something I need to change in my plist or some frameworks/imports needed?
Thanks
[EDIT]
I passed a NSError object through the writeToFile and got this error:
Error: Error Domain=NSCocoaErrorDomain Code=512 "The operation couldn’t be completed. (Cocoa error 512.)" UserInfo=0x12aa00 {NSFilePath=/var/mobile/Applications/887F4691-3B75-448F-9384-31EBF4E3B63E/Documents/file1.txt, NSUnderlyingError=0x14f6b0 "The operation couldn’t be completed. Not a directory"}
[EDIT 2]
This works fine on the simulator but not on my phone :/
Instead of using NSFileManager to get the contents of that file, try using NSString as such:
NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)
NSString *documentsDirectory = [pathArray objectAtIndex:0];
NSString *textPath = [documentsDirectory stringByAppendingPathComponent:#"file1.txt"];
NSError *error = nil;
NSString *str = [NSString stringWithContentsOfFile:textPath encoding:NSUTF8StringEncoding error:&error];
if (error != nil) {
NSLog(#"There was an error: %#", [error description]);
} else {
NSLog(#"Text file data: %#", str);
}
Edit: Added error checking code.
How are you getting documentsDirectory?
You should be using something like this:
NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)
NSString *documentsDirectory = [pathArray lastObject];
Put an NSLog statement after every line where you are setting a variable's value, so that you can inspect those values. This should help you quickly pinpoint where things start to go wrong.
The problem got solved by setting a non standard Bundle ID in die info.plist
I used the Bundle ID from iTunes Connect for this specific app. Now everything works perfectly.
You can also use NSFileHandle for writing data in file and save to document directory:
Create a variable of NSFileHandle
NSFileHandle *outputFileHandle;
use the prepareDataWrittenHandle function with passing file name in parameter with file extension
-(void)prepareDataWrittenHandle:(NSString *)filename
{
//Create Path of file in document directory.
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *outputFilePath = [documentsDirectory stringByAppendingPathComponent:filename];
//Check file with above name is already exits or not.
if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath] == NO) {
NSLog(#"Create the new file at outputFilePath: %#", outputFilePath);
//Create file at path.
BOOL suc = [[NSFileManager defaultManager] createFileAtPath:outputFilePath
contents:nil
attributes:nil];
NSLog(#"Create file successful?: %u", suc);
}
outputFileHandle = [NSFileHandle fileHandleForWritingAtPath:outputFilePath];
}
then write the string value to file as:
//Create a file
[self prepareDataWrittenHandle:#"file1.txt"];
//String to save in file
NSString *text = #"My cool text message";
//Convert NSString to NSData to save data in file.
NSData* data = [text dataUsingEncoding:NSUTF8StringEncoding]
//Write NSData to file
[_outputFileHandle writeData:data];
//close the file if written complete
[_outputFileHandle closeFile];
at the end of file written you should close the file.
You can also check the content written in file as NSString for debug point of view as mention above by #Glenn Smith:
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *outputFilePath = [documentsDirectory stringByAppendingPathComponent:#"file1.txt"];
NSError *error;
NSString *str = [NSString stringWithContentsOfFile:outputFilePath encoding:NSUTF8StringEncoding error:&error];
if (error != nil) {
NSLog(#"There was an error: %#", [error description]);
} else {
NSLog(#"Text file data: %#", str);
}
I am trying to check whether a plist exists in my doc folder: if yes, load it, if not load from resource folder.
- (void)viewWillAppear:(BOOL)animated
{
//to load downloaded file
NSArray *docpaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [docpaths objectAtIndex:0];
NSString *docpath = [documentsDirectory stringByAppendingPathComponent:#"downloadedfile.plist"];
//if document folder got file
if(docpath != nil)
{
NSDictionary *dict = [[NSDictionary alloc]
initWithContentsOfFile:docpath];
self.allNames = dict;
[dict release];
}
//on error it will try to read from disk
else {
NSString *path = [[NSBundle mainBundle] pathForResource:#"resourcefile"
ofType:#"plist"];
NSDictionary *dict = [[NSDictionary alloc]
initWithContentsOfFile:path];
self.allNames = dict;
[dict release];
}
[table reloadData];
Where did I go wrong? The plist is not loading from resource folder.
I think if you create an instance of NSFileManager you can then use the file exists method
BOOL exists;
NSFileManager *fileManager = [NSFileManager defaultManager];
exists = [fileManager fileExistsAtPath:docPath];
if(exists == NO)
{
// do your thing
}
You need to check wether the file exists in your Documents folder (with NSFileManager or something like this). stringByAppendingPathComponent: doesn’t care wether the path it returns exists or is valid.
I have used a similar approach in one of the applications and it was working fine for me. Where at the launch of the application, I check for the plist file inside the document directory and if it does not exists there, then it is copied from the resource folder.
NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString * plistName = #"FlowerList";
NSString * finalPath = [basePath stringByAppendingPathComponent:
[NSString stringWithFormat: #"%#.plist", plistName]];
NSFileManager * fileManager = [NSFileManager defaultManager];
if(![fileManager fileExistsAtPath:finalPath])
{
NSError *error;
NSString * sourcePath = [[NSBundle mainBundle] pathForResource:#"FlowerList" ofType:#"plist"];
[fileManager copyItemAtPath:sourcePath toPath:finalPath error:&error];
}
Here is the Swift version of Chris's Answer:
if (NSFileManager.defaultManager().fileExistsAtPath(path)) {
// ...
}