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tgunr on 03/14/07

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Last Edited at 03/14/07 01:38pm

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Create Zip file from data which user can unarchive

/ Published in: Other

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When you want to save your document as a Zip file.

using
cocoadev.com
http://www.cocoadev.com/index.pl?UsingZipFilesExamples

Please change the scratch folder etc to appropriate ones.

-(void)usageExample
{
// create sample data
NSString* text = @"test";
NSData* data = [text dataUsingEncoding:NSUTF8StringEncoding];

// Zip test 1

/*
NSData* convertedData = [self zip:data];

[convertedData writeToFile:[NSHomeDirectory() stringByAppendingPathComponent: @"Desktop/zip result"] atomically:YES];

// Zip test 2

NSFileWrapper* zipwrap = [[[NSFileWrapper alloc] initDirectoryWithFileWrappers:NULL ] autorelease];

[zipwrap addRegularFileWithContents:data preferredFilename:@"data1" ];
[zipwrap addRegularFileWithContents:data preferredFilename:@"data2" ];

NSData* convertedData = [self zip:zipwrap];

[convertedData writeToFile:[NSHomeDirectory() stringByAppendingPathComponent: @"Desktop/zip result"] atomically:YES];

// Unzip

NSFileWrapper* wrapper = [self unzip:convertedData];

if( [wrapper isRegularFile] )
{
NSLog(@"this is a regular file wrapper");

}
else
{
NSLog(@"this is a directory wrapper");

NSDictionary* regularFileWrappers = [wrapper fileWrappers];

NSLog(@"contains %@", [[regularFileWrappers allKeys] description] );

}

[wrapper writeToFile:[NSHomeDirectory() stringByAppendingPathComponent: @"Desktop/unzip result"] atomically:YES updateFilenames:YES];

}

-(NSData*)zip:(id)raw //raw must be NSData or NSFileWrapper
{
NSString* scratchFolder =[NSHomeDirectory() stringByAppendingPathComponent: @"Desktop/"];

NSString* sourceFilename = @"data";
NSString* targetFilename = @"zipped data";

NSString* sourcePath =[scratchFolder stringByAppendingPathComponent: sourceFilename];
NSString* targetPath =[scratchFolder stringByAppendingPathComponent: targetFilename];

BOOL flag = NO;

if( [raw isKindOfClass:[NSData class]] )
flag = [raw writeToFile:sourcePath atomically:YES];

else if( [raw isKindOfClass:[NSFileWrapper class]] )
flag = [raw writeToFile:sourcePath atomically:YES updateFilenames:YES];

if( flag == NO )
{
NSLog(@"Fail to write.");
return NULL;
}

/* Assumes sourcePath and targetPath are both
valid, standardized paths. */

//----------------
// Create the zip task
NSTask * backupTask = [[NSTask alloc] init];
[backupTask setLaunchPath:@"/usr/bin/ditto"];
[backupTask setArguments:
[NSArray arrayWithObjects:@"-c", @"-k", @"-X", @"--rsrc",
sourcePath, targetPath, nil]];

// Launch it and wait for execution
[backupTask launch];
[backupTask waitUntilExit];

// Handle the task's termination status
if ([backupTask terminationStatus] != 0)
{
NSLog(@"Sorry, didn't work.");
return NULL;
}

// You *did* remember to wash behind your ears ...
// ... right?
[backupTask release];

NSData* convertedData = [[[NSData alloc] initWithContentsOfFile:targetPath] autorelease];

//delete scratch

[[NSWorkspace sharedWorkspace] performFileOperation:NSWorkspaceDestroyOperation
source:scratchFolder
destination:@""
files:[NSArray arrayWithObjects:sourceFilename, targetFilename,NULL]
tag:NULL];

return convertedData;
}

-(NSFileWrapper*)unzip:(NSData*)zipData
{
NSString* scratchFolder =[NSHomeDirectory()
stringByAppendingPathComponent: @"Desktop/"];

NSString* sourceFilename = @"zipped data";
NSString* targetFilename = @"unzipped folder";

NSString* sourcePath =[scratchFolder stringByAppendingPathComponent: sourceFilename];
NSString* targetPath =[scratchFolder stringByAppendingPathComponent: targetFilename];

BOOL flag = [zipData writeToFile:sourcePath atomically:YES];

if( flag == NO )
{
NSLog(@"error");
return NULL;
}

//Unzip

//-------------------
NSTask *cmnd=[[NSTask alloc] init];
[cmnd setLaunchPath:@"/usr/bin/ditto"];
[cmnd setArguments:[NSArray arrayWithObjects:
@"-v",@"-x",@"-k",@"--rsrc",sourcePath,targetPath,nil]];
[cmnd launch];
[cmnd waitUntilExit];

// Handle the task's termination status
if ([cmnd terminationStatus] != 0)
{
NSLog(@"Sorry, didn't work.");
return NULL;
}

// You *did* remember to wash behind your ears ...
// ... right?
[cmnd release];

//unzip
//

NSArray* contents = [[NSFileManager defaultManager] directoryContentsAtPath:targetPath];

NSFileWrapper* wrapper;

if( [contents count] == 1 )
{
NSString* onepath;
onepath = [targetPath stringByAppendingPathComponent:[contents lastObject]];

NSData* data = [NSData dataWithContentsOfFile:onepath];

wrapper = [[[NSFileWrapper alloc] initRegularFileWithContents:data ] autorelease];

}
else if( [contents count] > 1 )
{

wrapper = [[[NSFileWrapper alloc] initDirectoryWithFileWrappers:NULL ] autorelease];

unsigned hoge;
for( hoge = 0; hoge < [contents count]; hoge++ )
{
NSString* onepath;
NSString* onefilename;

onefilename = [contents objectAtIndex:hoge];
onepath = [targetPath stringByAppendingPathComponent:onefilename];

NSData* data = [NSData dataWithContentsOfFile:onepath];

[wrapper addRegularFileWithContents:data preferredFilename:onefilename ];
}
}

//delete scratch

[[NSWorkspace sharedWorkspace] performFileOperation:NSWorkspaceDestroyOperation
source:scratchFolder
destination:@""
files:[NSArray arrayWithObjects:sourceFilename, targetFilename,NULL]
tag:NULL];

return wrapper;
}

URL: http://homepage.mac.com/mnishikata/page2/page2.html

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