以下代码转自CocoaChina会员的博客（FLYBLOG），能实现从iPhone压缩图片并上传至服务器的功能。
头文件
@interface EPUploader : NSObject {
NSURL *serverURL;
NSString *filePath;
id delegate;
SEL doneSelector;
SEL errorSelector;
BOOL uploadDidSucceed;
}
- (id)initWithURL: (NSURL *)serverURL
filePath: (NSString *)filePath
delegate: (id)delegate
doneSelector: (SEL)doneSelector
errorSelector: (SEL)errorSelector;
- (NSString *)filePath;
@end
实现文件
#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 *)boundry
data: (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 // IN
errorSelector: (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:serverURL
boundry: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 // IN
data: (NSData *)data // IN
{
// from http://www.cocoadev.com/index.pl?HTTPFileUpload
NSMutableURLRequest *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 // IN
didReceiveData:(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
使用方法
[[EPUploader alloc] initWithURL:[NSURL URLWithString:@"http://yourserver.com/uploadDB.php"]
filePath:@"path/to/some/file"
delegate:self
doneSelector:@selector(onUploadDone:)
errorSelector:@selector(onUploadError:)];