IOS文件下载
【摘要】
iOS开发中会经常用到文件上传下载的功能，这篇文件将介绍一下如何结合asp.net webservice实现文件上传下载。 首先，让我们看下文件下载。 这里我们下载cnblogs上的一个zip文件。使用NSURLRequest+NSURLConnection可以很方便的实现这个功能。在asp.net webserv...
| iOS开发中会经常用到文件上传下载的功能，这篇文件将介绍一下如何结合asp.net webservice实现文件上传下载。 |
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NSString *urlAsString = @"http://files.cnblogs.com/zhuqil/UIWebViewDemo.zip";
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NSURL *url = [NSURL URLWithString:urlAsString];
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NSURLRequest *request = [NSURLRequest requestWithURL:url];
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NSError *error = nil;
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NSData *data = http://www.cnblogs.com/zhwl/archive/2012/07/13/[NSURLConnection sendSynchronousRequest:request
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returningResponse:nil
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error:&error];
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/* 下载的数据 */
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if (data != nil){
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NSLog(@"下载成功");
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if ([data writeToFile:@"UIWebViewDemo.zip" atomically:YES]) {
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NSLog(@"保存成功.");
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}
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else
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{
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NSLog(@"保存失败.");
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}
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} else {
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NSLog(@"%@", error);
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}
2.异步下载
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DownLoadingViewController.h
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// DownLoadingViewController.h
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// DownLoading
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//
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// Created by skylin zhu on 11-7-30.
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// Copyright 2011年 mysoft. All rights reserved.
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//
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#import
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@interface DownLoadingViewController : UIViewController {
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NSURLConnection *connection;
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NSMutableData *connectionData;
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}
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@property (nonatomic,retain) NSURLConnection *connection;
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@property (nonatomic,retain) NSMutableData *connectionData;
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@end
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DownLoadingViewController.m
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// DownLoadingViewController.m
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// DownLoading
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//
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// Created by skylin zhu on 11-7-30.
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// Copyright 2011年 mysoft. All rights reserved.
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//
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#import "DownLoadingViewController.h"
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@implementation DownLoadingViewController
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@synthesize connection,connectionData;
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- (void)dealloc
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{
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[super dealloc];
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}
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- (void)didReceiveMemoryWarning
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{
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// Releases the view if it doesn't have a superview.
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[super didReceiveMemoryWarning];
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// Release any cached data, images, etc that aren't in use.
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}
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#pragma mark - View lifecycle
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// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
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- (void)viewDidLoad
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{
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[super viewDidLoad];
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//文件地址
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NSString *urlAsString = @"http://files.cnblogs.com/zhuqil/UIWebViewDemo.zip";
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NSURL *url = [NSURL URLWithString:urlAsString];
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NSURLRequest *request = [NSURLRequest requestWithURL:url];
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NSMutableData *data = http://www.cnblogs.com/zhwl/archive/2012/07/13/[[NSMutableData alloc] init];
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self.connectionData = http://www.cnblogs.com/zhwl/archive/2012/07/13/data;
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[data release];
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NSURLConnection *newConnection = [[NSURLConnection alloc]
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initWithRequest:request
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delegate:self
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startImmediately:YES];
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self.connection = newConnection;
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[newConnection release];
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if (self.connection != nil){
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NSLog(@"Successfully created the connection");
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} else {
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NSLog(@"Could not create the connection");
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}
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}
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- (void) connection:(NSURLConnection *)connection
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didFailWithError:(NSError *)error{
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NSLog(@"An error happened");
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NSLog(@"%@", error);
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}
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- (void) connection:(NSURLConnection *)connection
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didReceiveData:(NSData *)data{
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NSLog(@"Received data");
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[self.connectionData appendData:data];
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}
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- (void) connectionDidFinishLoading
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:(NSURLConnection *)connection{
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/* 下载的数据 */
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NSLog(@"下载成功");
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if ([self.connectionData writeToFile:@"UIWebViewDemo.zip" atomically:YES]) {
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NSLog(@"保存成功.");
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}
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else
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{
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NSLog(@"保存失败.");
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}
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/* do something with the data here */
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}
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- (void) connection:(NSURLConnection *)connection
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didReceiveResponse:(NSURLResponse *)response{
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[self.connectionData setLength:0];
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}
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- (void) viewDidUnload{
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[super viewDidUnload];
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[self.connection cancel];
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self.connection = nil;
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self.connectionData = http://www.cnblogs.com/zhwl/archive/2012/07/13/nil;
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}
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@end
文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。
原文链接：zzzili.blog.csdn.net/article/details/8424164
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