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)) {
// ...
}
Related
Its like this, in my app, I have a UIScrollView on it is a thumbnail view, they are images from my NSCachesDirectory.
I saved them from my picker then named them in my array like: images0.png,images.1.png... etc
So for example I have images in my directory this way : images0.png, images1.png, images2.png, images3.png.
Then I delete images1.png, the remaining images will be like this : images0.png,images2.png, images3.png right?
What I wanted to achieve is get the images in NSDocumentsDirectory then renamed them AGAIN or sort them again like images0.png, images1.png, images2.png...etc again?
is this possible? hope you could help me.
Use this NSFileManger moveItemAtPath: toPath: error: but you should supply the toPath:same_path_but_different_filename. This moves the file to a new path with new file name that you provide. see this
Since it seems you want the whole logic to rename your images file, here is the code you can try provided the files are in the Document directory
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString * oldPath =[[NSString alloc]init];
NSString * newPath =[[NSString alloc]init];
int count=0;
for (int i=0; i<=[[fileManager contentsOfDirectoryAtPath:documentsDirectory error:nil]count]; i++) {
oldPath=[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"images%d.png",i]];
if ([fileManager fileExistsAtPath:oldPath]) {
newPath=[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"images%d.png",count]];
[fileManager moveItemAtPath:oldPath toPath:newPath error:nil];
count+=1;
}
}
Apple doesnot allow renameing of file saved. So alternative is to get all contents at document directory like this:
NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:yourDocDirPath error:NULL];
Now sort like this:
NSSortDescriptor * descriptor = [NSSortDescriptor sortDescriptorWithKey:nil ascending: YES comparator:^NSComparisonResult(id obj1, id obj2){
return [obj1 compare: obj2 options: NSNumericSearch];
}];
NSArray * sortedDirectoryContent = [directoryContent sortedArrayUsingDescriptors:[NSArray arrayWithObject: descriptor]];
We have sorted array rewrite all files with new name:
for(NSString *fileName in sortedDirectoryContent)
{
NSString *filePath = [yourDocDirPath stringByAppendingPathComponent:fileName];
NSData *fileData = [[NSData alloc]initWithContentsOfFile:filePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
[[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
if(fileData)
{
NSString *newFilePath = [yourDocDirPath stringByAppendingPathComponent:#"New Name here"];
[fileData writeToFile:newFilePath atomically:YES];
}
}
else
{
if(fileData)
{
NSString *newFilePath = [yourDocDirPath stringByAppendingPathComponent:#"New Name here"];
[fileData writeToFile:newFilePath atomically:YES];
}
}
}
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'm making a application where I need to store some information the user have provided. I try to use a .plist file to store the information, I found this:
NSString *filePath = #"/Users/Denis/Documents/Xcode/iPhone/MLBB/data.plist";
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];
[plistDict setValue:#"Man" forKey:#"Gender"];
[plistDict writeToFile:filePath atomically: YES];
The problem is that the application will only work as long as I'm testing it in the iPhone simulator. I've tried this Changing Data in a Plist but without luck. I have also read something about that I need to add it to my bundle, but how?
New code:
- (IBAction)segmentControlChanged{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:#"data.plist"];
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistLocation];
if (Gender.selectedSegmentIndex == 0) {
[plistDict setObject:#"Man" forKey:#"Gender"];
[plistDict writeToFile:plistLocation atomically: YES];
}
else
{
[plistDict setObject:#"Women" forKey:#"Gender"];
[plistDict writeToFile:plistLocation atomically: YES];
}
}
I guess you have added your plist file to your resources folder in Xcode (where we place image, if not then you need to place that first). Resources data goes to [NSBundle mainBundle] by default and iOS does not allow us to change data inside bundle. So first you need to copy that file to Documents Directory.
Here is the code for copying file from NSBundle to the Documents directory.
- (NSString *)copyFileToDocumentDirectory:(NSString *)fileName {
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask,
YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *documentDirPath = [documentsDir
stringByAppendingPathComponent:fileName];
NSArray *file = [fileName componentsSeparatedByString:#"."];
NSString *filePath = [[NSBundle mainBundle]
pathForResource:[file objectAtIndex:0]
ofType:[file lastObject]];
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL success = [fileManager fileExistsAtPath:documentDirPath];
if (!success) {
success = [fileManager copyItemAtPath:filePath
toPath:documentDirPath
error:&error];
if (!success) {
NSAssert1(0, #"Failed to create writable txt file file with message \
'%#'.", [error localizedDescription]);
}
}
return documentDirPath;
}
Now you can use the returned documentDirPath to access that file and manipulate (Read/Write) over that.
The plist structure is:
<array>
<dict>key-value data</dict>
<dict>key-value data</dict>
</array>
Here is code to write data into plist file:
/* Code to write into file */
- (void)addToMyPlist {
// set file manager object
NSFileManager *manager = [NSFileManager defaultManager];
// check if file exists
NSString *plistPath = [self copyFileToDocumentDirectory:
#"MyPlistFile.plist"];
BOOL isExist = [manager fileExistsAtPath:plistPath];
// BOOL done = NO;
if (!isExist) {
// NSLog(#"MyPlistFile.plist does not exist");
// done = [manager copyItemAtPath:file toPath:fileName error:&error];
}
// NSLog(#"done: %d",done);
// get data from plist file
NSMutableArray * plistArray = [[NSMutableArray alloc]
initWithContentsOfFile:plistPath];
// create dictionary using array data and bookmarkKeysArray keys
NSArray *keysArray = [[NSArray alloc] initWithObjects:#"StudentNo", nil];
NSArray *valuesArray = [[NSArray alloc] initWithObjects:
[NSString stringWithFormat:#"1234"], nil];
NSDictionary plistDict = [[NSDictionary alloc]
initWithObjects:valuesArray
forKeys:keysArray];
[plistArray insertObject:poDict atIndex:0];
// write data to plist file
//BOOL isWritten = [plistArray writeToFile:plistPath atomically:YES];
[plistArray writeToFile:plistPath atomically:YES];
plistArray = nil;
// check for status
// NSLog(#" \n written == %d",isWritten);
}
Are you using that same path on your device? Apps on a device are sandboxed and can only read/write files in their documents directory. Grab that file path like this and append your plist name. This approach will also work on the simulator.
Try this:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:#"myplist.plist"];
I have a plist file in my main app bundle that I want to update via my app. Here is the code I'm using, the problem is that the plist doesn't seem to be getting updated. Is my code incorrect or is there another issue?
// Data
NSMutableDictionary *data = [[NSMutableDictionary alloc] init];
[data setObject:self.someValue forKey:#"Root"];
// Save the logs
NSString *filepath = [[NSBundle mainBundle] pathForResource:#"MyFile" ofType:#"plist"];
[data writeToFile:filepath atomically:YES];
Please can someone help me out?
IOS restricts writing to bundled files. If you want a writable plist, you need to copy it to your app's Documents folder and write to it there.
Here's how I'm doing it in one of my apps
//get file paths
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [documentPaths objectAtIndex:0];
NSString *documentPlistPath = [documentsDirectory stringByAppendingPathComponent:#"document.plist"];
NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
NSString *bundlePlistPath = [bundlePath stringByAppendingPathComponent:#"bundle.plist"];
//if file exists in the documents directory, get it
if([fileManager fileExistsAtPath:documentPlistPath]){
NSMutableDictionary *documentDict = [NSMutableDictionary dictionaryWithContentsOfFile:documentPlistPath];
return documentDict;
}
//if file does not exist, create it from existing plist
else {
NSError *error;
BOOL success = [fileManager copyItemAtPath:bundlePlistPath toPath:documentPlistPath error:&error];
if (success) {
NSMutableDictionary *documentDict = [NSMutableDictionary dictionaryWithContentsOfFile:documentPlistPath];
return documentDict;
}
return nil;
}
Hope this helps
I current have everything setup to read from the documents directory and write to it , but Cannot do it because the file doesnt exist yet.
How is a file created within the code?
If you already have a template version of the document in your application's bundle then you should be able to write it to the application's document directory using something similar to the following. I haven't tested this code so I've probably got a few things wrong but that's the general idea.
- (void) applicationDidFinishLaunching {
NSArray* directories = NSSearchPathsForDirectoriesInDomain(NSDocumentsDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [directories objectAtIndex: 0];
NSString* path = [documentsDirectory stringByAppendingPathComponent: #"Something.plist"];
if (![[NSFileManager sharedInstance] fileExistsAtPath: path]) {
NSString* infoTemplatePath = [[NSBundle mainBundle] pathForResource: #"Something" ofType: #"plist"];
NSDictionary* info = [NSDictionary dictionaryWithContentsOfFile: infoTemplatePath];
[info writeToFile: path];
}
}
Use NSFileManger's fileExistsAtPath: to see if the file exist. If not create it before going on to the code that requires the file.
This one works better for me:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent:#"*.db"];
if (![fileManager fileExistsAtPath:documentDBFolderPath])
{
NSString *resourceDBFolderPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"*.db"];
[fileManager copyItemAtPath:resourceDBFolderPath toPath:documentDBFolderPath error:&error];
}