NSString *urlAsString =@"http://files.cnblogs.com/zhuqil/UIWebViewDemo.zip";        NSURL    *url = [NSURL URLWithString:urlAsString];        NSURLRequest *request = [NSURLRequest requestWithURL:url];        NSError *error = nil;        NSData   *data = [NSURLConnection sendSynchronousRequest:request                                               returningResponse:nil                                                           error:&error];/* 下载的数据 */if (data != nil){            NSLog(@"下载成功");if ([data writeToFile:@"UIWebViewDemo.zip" atomically:YES]) {                NSLog(@"保存成功.");            }else            {                NSLog(@"保存失败.");            }        } else {            NSLog(@"%@", error);        } 

- (void)viewDidLoad{    [super viewDidLoad];//文件地址    NSString *urlAsString =@"http://files.cnblogs.com/zhuqil/UIWebViewDemo.zip";    NSURL    *url = [NSURL URLWithString:urlAsString];    NSURLRequest *request = [NSURLRequest requestWithURL:url];    NSMutableData *data = [[NSMutableData alloc] init];    self.connectionData = data;    [data release];    NSURLConnection *newConnection = [[NSURLConnection alloc]                                      initWithRequest:requestdelegate:self                                      startImmediately:YES];    self.connection = newConnection;    [newConnection release];if (self.connection != nil){       NSLog(@"Successfully created the connection");    } else {        NSLog(@"Could not create the connection");    }}

- (void) connection:(NSURLConnection *)connection            didFailWithError:(NSError *)error{    NSLog(@"An error happened");    NSLog(@"%@", error);}- (void) connection:(NSURLConnection *)connection              didReceiveData:(NSData *)data{    NSLog(@"Received data");    [self.connectionData appendData:data];}- (void) connectionDidFinishLoading:(NSURLConnection *)connection{/* 下载的数据 */

        NSLog(@"下载成功");if ([self.connectionData writeToFile:@"UIWebViewDemo.zip" atomically:YES]) {            NSLog(@"保存成功.");        }else        {            NSLog(@"保存失败.");        }

/* do something with the data here */}- (void) connection:(NSURLConnection *)connection          didReceiveResponse:(NSURLResponse *)response{    [self.connectionData setLength:0];}

- (void) viewDidUnload{    [super viewDidUnload];    [self.connection cancel];    self.connection = nil;    self.connectionData = nil;}

    <WebMethod(Description:="上传文件！")> _
Public Function UploadFile() As XmlDocumentDim doc As XmlDocument = New XmlDocument()TryDim postCollection As HttpFileCollection = Context.Request.FilesDim aFile As HttpPostedFile = postCollection("media")aFile.SaveAs(Server.MapPath(".") + "/" + Path.GetFileName(aFile.FileName))doc.LoadXml("<xml>ok</xml>")Return docCatch ex As Exceptiondoc.LoadXml("<xml>fail</xml>")Return docEnd TryEnd Function

@interface PicOperation : NSOperation
{UIImage *theImage;
}
@property (retain) UIImage *theImage;
@end

//
//  PicOperation.m
//  DownLoading
//
//  Created by skylin zhu on 11-7-30.
//  Copyright 2011年 mysoft. All rights reserved.
//#import "PicOperation.h"#define NOTIFY_AND_LEAVE(X) {[self cleanup:X]; return;}
#define DATA(X) [X dataUsingEncoding:NSUTF8StringEncoding]// Posting constants
#define IMAGE_CONTENT @"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n"
#define STRING_CONTENT @"Content-Disposition: form-data; name=\"%@\"\r\n\r\n"
#define MULTIPART @"multipart/form-data; boundary=------------0x0x0x0x0x0x0x0x"@implementation PicOperation
@synthesize theImage;//创建postdata
- (NSData*)generateFormDataFromPostDictionary:(NSDictionary*)dict
{id boundary = @"------------0x0x0x0x0x0x0x0x";NSArray* keys = [dict allKeys];NSMutableData* result = [NSMutableData data];for (int i = 0; i < [keys count]; i++) {id value = [dict valueForKey: [keys objectAtIndex:i]];[result appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];if ([value isKindOfClass:[NSData class]]) {// handle image dataNSString *formstring = [NSString stringWithFormat:IMAGE_CONTENT, [keys objectAtIndex:i]];[result appendData: DATA(formstring)];[result appendData:value];}else {// all non-image fields assumed to be stringsNSString *formstring = [NSString stringWithFormat:STRING_CONTENT, [keys objectAtIndex:i]];[result appendData: DATA(formstring)];[result appendData:DATA(value)];}NSString *formstring = @"\r\n";[result appendData:DATA(formstring)];}NSString *formstring =[NSString stringWithFormat:@"--%@--\r\n", boundary];[result appendData:DATA(formstring)];return result;
}
//上传图片
- (NSString *) UpLoading
{if (!self.theImage)NOTIFY_AND_LEAVE(@"Please set image before uploading.");NSMutableDictionary* post_dict = [[NSMutableDictionary alloc] init];[post_dict setObject:@"Posted from iPhone" forKey:@"message"];[post_dict setObject:UIImageJPEGRepresentation(self.theImage, 0.75f) forKey:@"media"];NSData *postData = [self generateFormDataFromPostDictionary:post_dict];[post_dict release];NSString *baseurl = @"http://10.5.23.121:7878/WorkflowService.asmx/UploadFile"; NSURL *url = [NSURL URLWithString:baseurl];NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];if (!urlRequest) NOTIFY_AND_LEAVE(@"Error creating the URL Request");[urlRequest setHTTPMethod: @"POST"];[urlRequest setValue:MULTIPART forHTTPHeaderField: @"Content-Type"];[urlRequest setHTTPBody:postData];// Submit & retrieve resultsNSError *error;NSURLResponse *response;NSLog(@"Contacting TwitPic....");NSData* result = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error];if (!result){[self cleanup:[NSString stringWithFormat:@"Submission error: %@", [error localizedDescription]]];return;}// Return resultsNSString *outstring = [[[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding] autorelease];return outstring;
}
@end

    PicOperation *pic = [[PicOperation alloc] init];pic.theImage=[UIImage imageNamed:@"meinv4.jpg"];;NSString *result = [pic UpLoading];NSLog(result);

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