判断文件是否存在以及创建文件

#import <Foundation/NSObject.h>
#import <Foundation/NSString.h>
#import <Foundation/NSFileManager.h>


int main (int argc, char *argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSString          *fName = @"testfile";
    NSFileManager     *fm;
   
    fm = [NSFileManager defaultManager];
     
    if ([fm fileExistsAtPath:fName] == NO){
        NSLog(@"File doesn't exist!");
        NSLog(@"Try to create file: testfile");
       
        if ([fm createFileAtPath:fName contents:nil attributes:nil] == YES){
            NSLog(@"Succeed create the file: testfile");
        };
    }
   
    [pool drain];
    return 0;
}