Chapter 16 Program 1

[clouded]

You must create our own testfile in Xcode using the author's note, then copy and paste it OR use it in it's current directory by putting the full path to the file

Code: (Objective-C)

//  Chapter 16 Program 1

// Basic File operations
// Assumes the existence of a file called "testfile" 
// in the current directory

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{
    
    @autoreleasepool {
        
        NSString *fName = @"testfile"; // or put full address path (e.g. @"/User/TestSubject/testfile")
        NSFileManager *fm;
        NSDictionary *attr;
        
        // Need to create an instance of the file manager 
        fm = [NSFileManager defaultManager];
        
        // Can place testfile in Debug directory instead of full address
        // To find the current directory uncomment the following lines
        //NSString *path;
        //path = [fm currentDirectoryPath];
        //NSLog (@"Current directory path is %@", path);
        
        // Let's make sure our test file exists first
        if ([fm fileExistsAtPath: fName] == NO) { 
            NSLog(@"File doesn't exist!");
            return 1;
        }
        
        //now lets make a copy
        if ([fm copyItemAtPath: fName toPath: @"newfile" error: NULL] == NO) {
            NSLog(@"File Copy failed!");
            return 2;
        }

        // Now let's test to see if the two files are equal
        if ([fm contentsEqualAtPath: fName andPath: @"newfile"] == NO) { 
            NSLog(@"Files are Not Equal!");
            return 3;
        }
        
        // Now lets rename the copy
        if ([fm moveItemAtPath: @"newfile" toPath: @"newfile2" error: NULL] == NO){
            NSLog(@"File rename Failed");
            return 4; }
        
        // get the size of the newfile2
        if ((attr = [fm attributesOfItemAtPath: @"newfile2" error: NULL]) == nil) {
            NSLog(@"Couldn't get file attributes!");
            return 5; 
        }
        NSLog(@"File size is %llu bytes", [[attr objectForKey: NSFileSize] unsignedLongLongValue]);
        
        // And finally, let's delete the original file
        if ([fm removeItemAtPath: fName error: NULL] == NO) {
            NSLog(@"file removal failed");
            return 6;
        }
        NSLog(@"All operations were successful");
        
        // Display the contents of the newly-created file
        NSLog(@"%@", [NSString stringWithContentsOfFile: @"newfile2" encoding:NSUTF8StringEncoding error:NULL]);
    }
    return 0;
}