读写文件

#import <Foundation/Foundation.h>
#import <Foundation/NSString.h>
#import <Foundation/NSFileManager.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSArray.h>
#import <Foundation/NSPathUtilities.h>
#import <Foundation/NSData.h>

int main (int argc, char *argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; NSFileHandle    *inFile, *outFile; NSData    *buffer;
    // Open the file testfile for reading
     
    inFile = [NSFileHandle fileHandleForReadingAtPath: @"testfile"];
    if (inFile == nil) {
        NSLog (@"Open of testfile for reading failed");
        return 1;
    }
    // Create the output file first if necessary
    [[NSFileManager defaultManager] createFileAtPath: @"testout" contents: nil attributes: nil];
    // Now open outfile for writing
    outFile = [NSFileHandle fileHandleForWritingAtPath: @"testout"];
    if (outFile == nil) {
        NSLog (@"Open of testout for writing failed");
        return 2;
    }
    // Truncate the output file since it may contain data
    [outFile truncateFileAtOffset: 0];
    // Read the data from inFile and write it to outFile
    buffer = [inFile readDataToEndOfFile];
    [outFile writeData: buffer];
    // Close the two files
    [inFile closeFile];
    [outFile closeFile];
    // Verify the file’s contents NSLog(@”%@”, [NSString StringWithContentOfFile: @”testout”]);
    [pool drain]; return 0;
}