fileHandleForUpdatingAtPath:
Returns a file handle initialized for reading and writing to the file, device, or named socket at the specified path.
+ (id)fileHandleForUpdatingAtPath:(NSString *)path
Parameters
- path
- The path to the file, device, or named socket to access.
Return Value of [NSFileHandle fileHandleForUpdatingAtPath]
The initialized file handle object or
nil if no file exists at path.Discussion of [NSFileHandle fileHandleForUpdatingAtPath]
The file pointer is set to the beginning of the file. The returned object responds to both
read... messages andwriteData:.
When using this method to create a file handle object, the file handle owns its associated file descriptor and is responsible for closing it.
Example of [NSFileHandle fileHandleForUpdatingAtPath]
- (void)saveText:(id)sender
{
[self.textview resignFirstResponder];
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [documentPaths objectAtIndex:0];
NSString *documentTXTPath = [documentsDirectory stringByAppendingPathComponent:@"Notes.txt"];
NSString *savedString = textview.text;
NSFileHandle *myHandle = [NSFileHandle fileHandleForUpdatingAtPath:documentTXTPath ];
[myHandle seekToEndOfFile];
[myHandle writeData: [savedString dataUsingEncoding:NSUTF8StringEncoding]];
[myHandle closeFile];
}