nsfilemanager

问题 I have used this code to write a string to the same file 10 times . But it is overwriting the previous data for every new launch. I want to append the new data to the old data . [@"one" writeToFile:[self returnDocumentsDirectory] atomically:NO encoding:NSASCIIStringEncoding error:nil]; -(NSString *)returnDocumentsDirectory { NSArray *DocumentsDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *path = [DocumentsDirectoryPath objectAtIndex

问题 I'm trying to find a file size. NSFileHandle *output = [NSFileHandle fileHandleForWritingAtPath:self.finalPath]; //seek to begin of the file [output seekToFileOffset:0]; NSData *mydata = [output availableData]; NSLog(@"length: %d", [mydata length]); But my length is equl to zero. Why? 回答1: availableData is for reading files. If you just want to find out the size of a file, you don't actually have to open it. Just use NSFileManager like this: NSDictionary *attributes = [[NSFileManager

问题 I am working with NSFileManager and I am able to get the file's last update, creation date, ... but I am not able to get when was the last time the file was opened. Is there any way to get this information? And other question, I get the MIME by the pathExtension property, but this way I get for example .pdf, .doc, ... instead of application/pdf, application/doc, text/txt, audio/vmw, ...is any way to get this information automatically? Thanks a lot! 回答1: Use Spotlight's MDItem API to get all

问题 I looked here and there but to no avail. Consider: - (void) write: (NSString *) xId data:(NSData *) data forClass: (Class) c { NSFileManager * fm = [NSFileManager defaultManager] ; NSString * instancePath = [self instancePath:xId forClass: c] ; errno = 0 ; BOOL success = [fm createFileAtPath: instancePath contents: data attributes: nil] ; if (!success) { ::NSLog(@"Couldn't write to path: %@", instancePath) ; ::NSLog(@"Error was code: %d - message: %s", errno, strerror(errno)); } else { :

问题 How can I check if a file is an Alias on Mac? Here is my code so far: public func getFiles(){ let folderPath = "/Users/timeBro/Desktop/testfolder" let fileManager = NSFileManager.defaultManager() let enumerator:NSDirectoryEnumerator = fileManager.enumeratorAtPath(folderPath)! for url in enumerator.allObjects { let newurl = NSURL(string: url as! String) print("\(url as! String)") print(url); print(newurl?.isFileReferenceURL()) } } How can I check if the file is and alias? 回答1: Update : I

问题 This question already has answers here : How to overwrite a file with NSFileManager when copying? (9 answers) Closed 3 years ago . I'm trying to move a file even if a file with the same name already exists. NSFileManager().moveItemAtURL(location1, toURL: location2) Does NSFileManager 's method moveItemAtURL have an override option? How can I replace the existing file? 回答1: You can always check if the file exists in the target location. if it does, delete it and move your item. Swift 2.3 let

问题 The documentation for documentBrowser(_:didRequestDocumentCreationWithHandler:) says, "Create a new document and save it to a temporary location. If you use a UIDocument subclass to create the document, you must close it before calling the importHandler block." So I created a file URL by taking the URL for the user's temporary directory ( FileManager.default.temporaryDirectory ) and appending a name and extension (getting a path like "file:///private/var/mobile/Containers/Data/Application

问题 I am attempting to save thumbnails of user generated photos in a subdirectory in the documents directory, but I am unable to create the subdirectory in the first place. When I attempt to create the subdirectory in the documents directory I get this error (No such file or directory): Error Domain=NSCocoaErrorDomain Code=4 "The operation couldn’t be completed. (Cocoa error 4.)" UserInfo=0x17ef9c90 {NSFilePath=/var/mobile/Applications/FD0CC480-97FE-4E50-931F-5341DB6AD92B/Documents/com.Jonathan

问题 I was trying to create a directory NSError*error=nil; NSString* BIDirectory=[[NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0] stringByAppendingPathComponent:@"BI"]; BOOL isDir,flag=YES; //if the directory doesn't exist create it. if(!([[NSFileManager defaultManager] fileExistsAtPath:BIDirectory isDirectory:&isDir]&& isDir)) flag=[[NSFileManager defaultManager] createDirectoryAtURL:[NSURL URLWithString:BIDirectory] withIntermediateDirectories:YES

问题 I am new to iPhone, I made app in which, when user downloads anything it gets downloaded into DocumentDirectory I wants downloading inside my folder which i have created in DocumentDirectory How to achieve this ? I thought I will download file to my DocumentDirectory and i will move that file to my folder inside DocumentDirectory . Is it good practice ? Here is my code snippet, But still i am unable to move my file. - (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*