exercise 16-6

[mdziedzic]

Code: (Objective-C)

#import <Foundation/Foundation.h>

#define kBufSize 128

int main (int argc, const 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 the file 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 in kBufSize chunks
	
	while ([buffer = [inFile readDataOfLength: kBufSize] bytes] != nil)
		[outFile writeData: buffer];
	
	// close the two files
	
	[inFile closeFile];
	[outFile closeFile];
	
	// verify the file's contents
	
	NSLog(@"%@", [NSString stringWithContentsOfFile: @"../../testout" encoding: NSUTF8StringEncoding
											  error: nil]);
    
	[pool drain];
    return 0;
}