Is it possible to create the temporary directories in cocoa application for saving the files temporarily.
As per the scenario I need to process some video files and those files firstly will be converted to thumbnails etc then whose files will be uploaded to server.
How this can be achieved?
The easiest way to get the temporary directory is to use NSTemporaryDirectory()
Edit
The above is no longer the approved method of locating the temporary directory. You should now use [NSFileManager URLForDirectory:inDomain:appropriateForURL:create:error:].
You can use NSTemporaryDirectory().
Returns the path of the temporary directory for the current user.
NSString* tempDir = NSTemporaryDirectory();
NSString* bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier];
tempDir = [tempDir stringByAppendingPathComponent:bundleIdentifier];
Related
I am trying to make a Mac app.
To create txt files
-(IBAction)create:(id)sender {
system("/Users/pedrocosta/Desktop/");
system ("touch Mytxtfile.txt");
but how can I link these two expressions?
system("/Users/pedrocosta/Desktop/");
system ("touch Mytxtfile.txt");
Because when I try the app the computer only do:
system("/Users/pedrocosta/Desktop/");
If you're trying to create a file, you should use the Cocoa API:
[[NSFileManager defaultManager] createFileAtPath:#"/Users/pedrocosta/Desktop/Mytxtfile.txt" contents:nil attributes:nil];
If for some reason you want to use the system function, then why don't you try:
system("/usr/bin/touch /Users/pedrocosta/Desktop/Mytxtfile.txt");
in my app, I want to load certain image user picks, make some modification, after that, save a copy in my own file format. Since I want to keep track of user modification, I decided to export my file as a package(bundle).
So, in my document class, there's a NSImage object that holds the image file. In the fileWrapperOfType:error: method, I've setup a NSFileWrapper object, and put the object in it. Here's the code:
NSDictionary *fileWrappers = [self.documentFileWrapper fileWrappers];
if (image != nil) {
NSBitmapImageRep *imageRep = [image bitmapImageRepresentation];
NSData *imageData = [imageRep representationUsingType:NSPNGFileType properties:nil];
NSFileWrapper *imageFileWrapper = [[NSFileWrapper alloc]
initRegularFileWithContents:imageData];
[imageFileWrapper setPreferredFilename:#"image"];
[[self documentFileWrapper] addFileWrapper:imageFileWrapper];
}
return self.documentFileWrapper;
In my project plist file, I have two document types, first is the type of public.image since I need to load images in my app:
The other one is my own document type. To make the file a package, I've checked the bundle checkbox in xcode:
If I simply run this now, the code compains that finding extension from type identifier is deprecated, so, I managed to add an entry in Exported UTIs:
At this moment, everything seems working, except that the outputed folder with mdc extension, is indeed a folder instead of a package, what am I missing here? Thanks in advance!
Finally I solved the problem, the key here is to change Conforms To field to com.apple.package.
In order for a package on OS X to be a pkg, it must have a .pkg extension. I hope it is as simple as having the wrong extension.
Note: Until recently, .pkg files were merely directories. Now, we often see package.pkg packages that are obscured cannot be browsed causually without some tricks like using Pacifist, pkgutil or xar:
pkgutil --extract file.pkg folder/
or
xar -xf file.pkg
I am attempting to upload a local folder full of documents to a remote iCloud folder. I wrote this method to loop through the array of files in the local folder, check if they already exist, and if they don't exist upload them to iCloud. Note- this code is being executed on the background thread not the main thread.
//Get the array of files in the local documents directory
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSArray *localDocuments = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:nil];
//Compare the arrays then upload documents not already existent in iCloud
for (int item = 0; item < [localDocuments count]; item++) {
//If the file does not exist in iCloud, upload it
if (![[iCloud previousQueryResults] containsObject:[localDocuments objectAtIndex:item]]) {
NSLog(#"Uploading %# to iCloud...", [localDocuments objectAtIndex:item]);
//Move the file to iCloud
NSURL *destinationURL = [[[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil] URLByAppendingPathComponent:[NSString stringWithFormat:#"Documents/%#",[localDocuments objectAtIndex:item]]];
NSError *error;
NSURL *directoryURL = [[NSURL alloc] initWithString:[documentsDirectory stringByAppendingPathComponent:[localDocuments objectAtIndex:item]]];
BOOL success = [[NSFileManager defaultManager] setUbiquitous:YES itemAtURL:directoryURL destinationURL:destinationURL error:&error];
if (success == NO) {
//Determine Error
NSLog(#"%#",error);
}
} else {
...
} }
When I run this code the For Loop works fine - I use NSLog statements to find out which file it is uploading - and every file stored locally that isn't already in iCloud is supposed to start uploading. After the For Loop is finished I check which documents are now in iCloud using developer.icloud.com. Only one file (an sqlite file that my app keeps making but never uses) out of the many stored locally uploads to iCloud. Why would only one file upload when using for loops?
When I use the same code to upload individual files (without a For Loop) they upload to iCloud perfectly. Why would a For Loop hinder the uploading of files? Does this have to do with the For Loop continuing to the next line of code without waiting for the last process / line to finish executing? What's going on here?
EDIT: Usually when I upload large files to iCloud (without using a For Loop) I can see on the iCloud dev site that the file is Pending Upload almost instantly. I'm testing everything over WiFi and I've been waiting a while but nothing appears (except for the sqlite file).
EDIT: I also check for iCloud availability in a different method which then allows calls to this method if iCloud is available. I've also made sure to read over the documentation and watched the WWDC videos on Apple's website, however they are complex and don't provide much explanation for what I'm trying to do.
EDIT: After revising the code above (adding the error functionality), I now get this error message in the log:
Error Domain=NSCocoaErrorDomain Code=512 "The operation couldn’t be completed. (Cocoa error 512.)" UserInfo=0x1f5dd070 {NSUnderlyingError=0x208ad9b0 "The operation couldn’t be completed. (LibrarianErrorDomain error 2 - No source URL specified.)"}
This makes things even more confusing because one of the files uploads successfully, whereas the others do not.
OK, that last edit is useful. The error complains that the source URL (directoryURL in your code) is missing-- probably because it's nil. Why would it be nil? Because you're creating it wrong. You're using -[NSURL initWithString:], and the docs say that:
This string must conform to URL format as described in RFC 2396. This method parses URLString according to RFCs 1738 and 1808.
You're passing in a file path, not a URL. If you pass NSURL something it doesn't recognize as a valid URL, it normally returns nil. It looks like NSURL will frequently produce a file URL anyway, but failure is the expected behavior here. From what I can tell it seems to work if the filename contains no spaces, but that's not documented and not something you could rely on.
What you should do is change the line where you initialize directoryURL to use something that accepts a file path. Something like:
NSURL *directoryURL = [NSURL fileURLWithPath:[documentsDirectory stringByAppendingPathComponent:[localDocuments objectAtIndex:item]]];
Also, make sure to verify that directoryURL is not nil, just in case.
Until now my database was saved in the documents directory of application. Now Apple refuse to do it anymore and I need to change the directory.
Does anyone know how to save a database in cached directory, or even direct me to a tutorial/example.
The caches directory will be the last entry returned from NSSearchPathForDirectoriesInDomains:
NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSString *dbPath = [cachesPath stringByAppendingPathComponent:#"mydatabase.db"];
I have a folder structure in my server and I need to navigate through that folder at device side.
I receive the folder structure in XML format.
My query is :-
1) Can I create the same folder structure in documents folder of my iPhone app.
2) What would be the best approach whether to create folders at device documents folder or just read the XML and show the folders as we parse it(I mean no folder creation).
Waiting for your reply
I'm not 100% sure of your question, but I think this is what you're after...
First, you have to parse the XML from your server. You can do this with the built in NSXMLParser or with one of the various XML-parsers and document handlers out there. A few alternatives:
http://code.google.com/p/touchcode/wiki/TouchXML
http://code.google.com/p/kissxml/
http://cocoawithlove.com/2008/10/using-libxml2-for-parsing-and-xpath.html
Then, you can create directories on your iPhone applications own document folder using the following code. I will assume you have a NSArray named directories containing some directory names as NSStrings.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [paths objectAtIndex:0];
for (NSString *directory in directories) {
NSString *directoryPath = [storagePath stringByAppendingPathComponent:directory];
[[NSFileManager defaultManager] createDirectoryAtPath: directoryPath attributes:nil];
}
This code is of course very simple and does not include support for adding a entire folder structure (just the first level). But you get the idea.