IPhone SDK development: how to upload image files to the server

Link: http://www.flyblog.info/catprogramming/392.html

Header file:

@interface EPUploader : NSObject {NSURL *serverURL;NSString *filePath;id delegate;SEL doneSelector;SEL errorSelector; BOOL uploadDidSucceed;} -   (id)initWithURL: (NSURL *)serverURLfilePath: (NSString *)filePathdelegate: (id)delegatedoneSelector: (SEL)doneSelectorerrorSelector: (SEL)errorSelector; -   (NSString *)filePath; @end

Implementation file:

#import "EPUploader.h"#import static NSString * const BOUNDRY = @"0xKhTmLbOuNdArY";static NSString * const FORM_FLE_INPUT = @"uploaded"; #define ASSERT(x) NSAssert(x, @"") @interface EPUploader (Private) - (void)upload;- (NSURLRequest *)postRequestWithURL: (NSURL *)url boundry: (NSString *)boundrydata: (NSData *)data;- (NSData *)compress: (NSData *)data;- (void)uploadSucceeded: (BOOL)success;- (void)connectionDidFinishLoading:(NSURLConnection *)connection; @end @implementation EPUploader /* *----------------------------------------------------------------------------- * * -[Uploader initWithURL:filePath:delegate:doneSelector:errorSelector:] -- * *  Initializer. Kicks off the upload. Note that upload will happen on a *  separate thread. * * Results: *  An instance of Uploader. * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (id)initWithURL: (NSURL *)aServerURL   // IN filePath: (NSString *)aFilePath // IN delegate: (id)aDelegate // IN doneSelector: (SEL)aDoneSelector// INerrorSelector: (SEL)anErrorSelector  // IN{if ((self = [super init])) {ASSERT(aServerURL);ASSERT(aFilePath);ASSERT(aDelegate);ASSERT(aDoneSelector);ASSERT(anErrorSelector); serverURL = [aServerURL retain];filePath = [aFilePath retain];delegate = [aDelegate retain];doneSelector = aDoneSelector;errorSelector = anErrorSelector; [self upload];}return self;} /* *----------------------------------------------------------------------------- * * -[Uploader dealloc] -- * *  Destructor. * * Results: *  None * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (void)dealloc{[serverURL release];serverURL = nil;[filePath release];filePath = nil;[delegate release];delegate = nil;doneSelector = NULL;errorSelector = NULL; [super dealloc];} /* *----------------------------------------------------------------------------- * * -[Uploader filePath] -- * *  Gets the path of the file this object is uploading. * * Results: *  Path to the upload file. * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (NSString *)filePath{return filePath;} @end // Uploader @implementation EPUploader (Private) /* *----------------------------------------------------------------------------- * * -[Uploader(Private) upload] -- * *  Uploads the given file. The file is compressed before beign uploaded. *  The data is uploaded using an HTTP POST command. * * Results: *  None * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (void)upload{NSData *data = [NSData dataWithContentsOfFile:filePath];ASSERT(data);if (!data) {[self uploadSucceeded:NO];return;}if ([data length] == 0) {// There's no data, treat this the same as no file.[self uploadSucceeded:YES];return;} //  NSData *compressedData = [self compress:data];//  ASSERT(compressedData && [compressedData length] != 0);//  if (!compressedData || [compressedData length] == 0) {//  [self uploadSucceeded:NO];//  return;//  } NSURLRequest *urlRequest = [self postRequestWithURL:serverURLboundry:BOUNDRY   data:data];if (!urlRequest) {[self uploadSucceeded:NO];return;} NSURLConnection * connection =[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];if (!connection) {[self uploadSucceeded:NO];} // Now wait for the URL connection to call us back.} /* *----------------------------------------------------------------------------- * * -[Uploader(Private) postRequestWithURL:boundry:data:] -- * *  Creates a HTML POST request. * * Results: *  The HTML POST request. * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (NSURLRequest *)postRequestWithURL: (NSURL *)url// IN boundry: (NSString *)boundry // INdata: (NSData *)data  // IN{// from http://www.cocoadev.com/index.pl?HTTPFileUploadNSMutableURLRequest *urlRequest =[NSMutableURLRequest requestWithURL:url];[urlRequest setHTTPMethod:@"POST"];[urlRequest setValue: [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundry]  forHTTPHeaderField:@"Content-Type"]; NSMutableData *postData =[NSMutableData dataWithCapacity:[data length] + 512];[postData appendData: [[NSString stringWithFormat:@"--%@\r\n", boundry] dataUsingEncoding:NSUTF8StringEncoding]];[postData appendData: [[NSString stringWithFormat:   @"Content-Disposition: form-data; name=\"%@\"; filename=\"file.bin\"\r\n\r\n", FORM_FLE_INPUT]  dataUsingEncoding:NSUTF8StringEncoding]];[postData appendData:data];[postData appendData: [[NSString stringWithFormat:@"\r\n--%@--\r\n", boundry] dataUsingEncoding:NSUTF8StringEncoding]]; [urlRequest setHTTPBody:postData];return urlRequest;} /* *----------------------------------------------------------------------------- * * -[Uploader(Private) compress:] -- * *  Uses zlib to compress the given data. * * Results: *  The compressed data as a NSData object. * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (NSData *)compress: (NSData *)data // IN{if (!data || [data length] == 0)return nil; // zlib compress doc says destSize must be 1% + 12 bytes greater than source.uLong destSize = [data length] * 1.001 + 12;NSMutableData *destData = [NSMutableData dataWithLength:destSize]; int error = compress([destData mutableBytes], &destSize, [data bytes], [data length]);if (error != Z_OK) {NSLog(@"%s: self:0x%p, zlib error on compress:%d\n",__func__, self, error);return nil;} [destData setLength:destSize];return destData;} /* *----------------------------------------------------------------------------- * * -[Uploader(Private) uploadSucceeded:] -- * *  Used to notify the delegate that the upload did or did not succeed. * * Results: *  None * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (void)uploadSucceeded: (BOOL)success // IN{[delegate performSelector:success ? doneSelector : errorSelector   withObject:self];} /* *----------------------------------------------------------------------------- * * -[Uploader(Private) connectionDidFinishLoading:] -- * *  Called when the upload is complete. We judge the success of the upload *  based on the reply we get from the server. * * Results: *  None * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (void)connectionDidFinishLoading:(NSURLConnection *)connection // IN{NSLog(@"%s: self:0x%p\n", __func__, self);[connection release];[self uploadSucceeded:uploadDidSucceed];} /* *----------------------------------------------------------------------------- * * -[Uploader(Private) connection:didFailWithError:] -- * *  Called when the upload failed (probably due to a lack of network *  connection). * * Results: *  None * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (void)connection:(NSURLConnection *)connection // IN  didFailWithError:(NSError *)error  // IN{NSLog(@"%s: self:0x%p, connection error:%s\n",__func__, self, [[error description] UTF8String]);[connection release];[self uploadSucceeded:NO];} /* *----------------------------------------------------------------------------- * * -[Uploader(Private) connection:didReceiveResponse:] -- * *  Called as we get responses from the server. * * Results: *  None * * Side effects: *  None * *----------------------------------------------------------------------------- */ -(void)   connection:(NSURLConnection *)connection // IN  didReceiveResponse:(NSURLResponse *)response // IN{NSLog(@"%s: self:0x%p\n", __func__, self);} /* *----------------------------------------------------------------------------- * * -[Uploader(Private) connection:didReceiveData:] -- * *  Called when we have data from the server. We expect the server to reply *  with a "YES" if the upload succeeded or "NO" if it did not. * * Results: *  None * * Side effects: *  None * *----------------------------------------------------------------------------- */ - (void)connection:(NSURLConnection *)connection // INdidReceiveData:(NSData *)data// IN{NSLog(@"%s: self:0x%p\n", __func__, self); NSString *reply = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]   autorelease];NSLog(@"%s: data: %s\n", __func__, [reply UTF8String]); if ([reply hasPrefix:@"YES"]) {uploadDidSucceed = YES;}} @end

Usage:

[[EPUploader alloc] initWithURL:[NSURL URLWithString:@"http://yourserver.com/uploadDB.php"]filePath:@"path/to/some/file"delegate:selfdoneSelector:@selector(onUploadDone:) errorSelector:@selector(onUploadError:)];