Question

I am new to Xcode and was wondering if anyone could help me with this.

I need to make an application that is able to open a file and replace its contents.

E.g. (in psuedo code)

Replace(“String1”, “String2”, “~/Desktop/Sample.txt”)

Please let me know if I’m not clear enough.

Thanks in advance.

Answer 1

You probably want this

And regarding your question about how to read the text from a file to a NSString:

NSError * error;
NSString * stringFromFile;
NSString * stringFilepath = @"loadfile.txt";
stringFromFile = [[NSString alloc] initWithContentsOfFile:stringFilepath
                                          encoding:NSWindowsCP1250StringEncoding
                                              error:&error];

And for writing to a file:
(using the same NSString from loading: stringFromFile)

NSError * error;
NSString * stringFilepath = @"savefile.txt";
[stringFromFile writeToFile:stringFilepath atomically:YES encoding:NSWindowsCP1250StringEncoding error:error];

Note that in this example i use an encoding for windows (this means it uses charcters \n\r at the end of each line). Check the documentation for other types of encoding.

(See NSString documentation)