Question

I am trying to run some sample code and am having trouble creating and saving to a file.

Here is my code:

-(IBAction) example
{
    NSFileManager *fm = [[NSFileManager alloc] init];
    NSURL *docsurl = [fm URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask  appropriateForURL:nil create:YES error:nil];
    myfolder = [docsurl URLByAppendingPathComponent:@"MyFolder"];
    NSError * err = nil;
    BOOL ok = [fm createDirectoryAtURL:myfolder withIntermediateDirectories:YES attributes:nil error:&err];
    ok = [label.text writeToURL:myfolder atomically:YES encoding:NSUTF8StringEncoding error:nil];       
}

-(IBAction) load
{
    label2.text = [[NSString alloc] initWithContentsOfURL:myfolder
    encoding:NSUTF8StringEncoding error:nil];
}

I want it to save the first label’s text to the file when I push the first button. When I push the second button, I want it to read what is in the file and make the second label text that. However when I push the second button, the second label just goes blank.
Any suggestions?

Answer 1

I suggest actually using those NSError objects. I also suggest using the default NSFileManager.

-(IBAction) example
{
    NSFileManager *fm = [NSFileManager defaultManager];
    NSError *error;
    NSURL *docsurl = [fm URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask  appropriateForURL:nil create:YES error:&error];
    myfolder = [docsurl URLByAppendingPathComponent:@"MyFolder"];
    NSError * err = nil;

    if ([fm createDirectoryAtURL:myfolder withIntermediateDirectories:YES attributes:nil error:&err]) {
        if ([label.text writeToURL:myfolder atomically:YES encoding:NSUTF8StringEncoding error:&err]) {

        }
        else {
            NSLog(@"%@", err);
        }
    }
    else {
        NSLog(@"%@", err);
    }


}

-(IBAction) load
{
    NSError *err;
    if ([[NSString alloc] initWithContentsOfURL:myfolder
    encoding:NSUTF8StringEncoding error:&err]) {
        label2.text = [[NSString alloc] initWithContentsOfURL:myfolder
    encoding:NSUTF8StringEncoding error:nil];
    }
    else {
        NSLog(@"%@", err);
    }
}

This code will not work as is, but it will print out whatever errors you are encountering which should help you solve the problem.