Cocoa Maker 5 - File Management

James (MrGeckosMedia.com), joined by, Noah (RockntheSweater.com), and Karl, explains how file managing works in c and cocoa.

7:49

Example code from episode.
Files C Example

#import <Foundation/Foundation.h>

BOOL file_exist(const char *fileName) {
    FILE *file = fopen(fileName, "r");
    if (file) {
        fclose(file);
        return YES;
    }
    return NO;
}

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    const char *ourFile = [[@"~/Desktop/file.txt" stringByExpandingTildeInPath] UTF8String];
    FILE *file;
    
    if (!file_exist(ourFile)) {
        file = fopen(ourFile, "w");
        time_t currTime = time(NULL);
        fprintf(file, "%s: We just made this file.\n", ctime(&currTime));
    } else {
        file = fopen(ourFile, "a");
    }
    time_t currTime = time(NULL);
    fprintf(file, "%s: Here is a new line in this file.\n", ctime(&currTime));
    fclose(file);

    
    [pool drain];
    return 0;
}

Files Cocoa Exmaple

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    NSFileManager *manager = [NSFileManager defaultManager];
    NSString *ourFile = [@"~/Desktop/file.txt" stringByExpandingTildeInPath];
    NSFileHandle *file;
    
    if (![manager fileExistsAtPath:ourFile]) {
        [manager createFileAtPath:ourFile contents:nil attributes:nil];
        file = [NSFileHandle fileHandleForWritingAtPath:ourFile];
        [file writeData:[[NSString stringWithFormat:@"%@: Here is a new file.\n", [NSDate date]] dataUsingEncoding:NSUTF8StringEncoding]];
    } else {
        file = [NSFileHandle fileHandleForWritingAtPath:ourFile];
        [file seekToEndOfFile];
    }
    [file writeData:[[NSString stringWithFormat:@"%@: Here is a new line.\n", [NSDate date]] dataUsingEncoding:NSUTF8StringEncoding]];
    [file closeFile];
    
    [pool drain];
    return 0;
}

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