流媒体在线播放和断点续传下载到本地demo

下面将演示流媒体在线播放和断点续传下载到本地的功能，由于代码比较多，所以会分成几期来写
方便总结和让大家看得清楚。

本文利用 table view 组合 cell 和实现 流媒体的显示和下载、暂停、继续等功能。

cell代码：

@interface MusicCell : UITableViewCell <UIAlertViewDelegate,UIAlertViewDelegate>{

    IBOutlet UILabel *musicName;

    IBOutlet UILabel *musicSize;

    IBOutlet UIButton *musicDown;

    FileModel *fileInfo;

}



@property(nonatomic,retain)IBOutlet UILabel *musicName;

@property(nonatomic,retain)IBOutlet UILabel *musicSize;

@property(nonatomic,retain)IBOutlet UIButton *musicDown;

@property(nonatomic,retain)FileModel *fileInfo;



-(IBAction)downMusic:(id)sender;//点击下载开始下载

@end

//

//  MusicCell.m

//  Hayate

//

//  Created by 韩 国翔 on 11-12-2.

//  Copyright 2011年 山东海天软件学院. All rights reserved.

//



#import "MusicCell.h"





@implementation MusicCell



@synthesize musicName;

@synthesize musicSize;

@synthesize musicDown;

@synthesize fileInfo;



- (void)dealloc

{

    [fileInfo release];

    [musicDown release];

    [musicSize release];

    [musicName release];

    [super dealloc];

}



-(void)downMusic:(id)sender

{    

    FileModel *selectFileInfo=self.fileInfo;

    

    //选择点击的行

//    UITableView *tableView=(UITableView *)[sender superview];

//    NSLog(@"%d",[fileInfo.fileID integerValue]);

//    NSIndexPath *indexPath=[NSIndexPath indexPathForRow:[fileInfo.fileID integerValue] inSection:0];

//    [tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionBottom];

    

    //因为是重新下载，则说明肯定该文件已经被下载完，或者有临时文件正在留着，所以检查一下这两个地方，存在则删除掉

    NSString *targetPath=[[CommonHelper getTargetFloderPath]stringByAppendingPathComponent:selectFileInfo.fileName];

    NSString *tempPath=[[[CommonHelper getTempFolderPath]stringByAppendingPathComponent:selectFileInfo.fileName]stringByAppendingString:@".temp"];

    if([CommonHelper isExistFile:targetPath])//已经下载过一次该音乐

    {

        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"该文件已经添加到您的下载列表中了！是否重新下载该文件？" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

        [alert show];

        [alert release];

        return;

    }

    //存在于临时文件夹里

    if([CommonHelper isExistFile:tempPath])

    {

        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"该文件已经添加到您的下载列表中了！是否重新下载该文件？" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

        [alert show];

        [alert release];

        return;

    }

    selectFileInfo.isDownloading=YES;

    //若不存在文件和临时文件，则是新的下载

    HayateAppDelegate *appDelegate=APPDELEGETE;

    [appDelegate beginRequest:selectFileInfo isBeginDown:YES];

}



-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

{

    if(buttonIndex==1)//确定按钮

    {

        NSFileManager *fileManager=[NSFileManager defaultManager];

        NSError *error;

        HayateAppDelegate *appDelegate=APPDELEGETE;

        NSString *targetPath=[[CommonHelper getTargetFloderPath]stringByAppendingPathComponent:self.fileInfo.fileName];

        NSString *tempPath=[[[CommonHelper getTempFolderPath]stringByAppendingPathComponent:self.fileInfo.fileName]stringByAppendingString:@".temp"];

        if([CommonHelper isExistFile:targetPath])//已经下载过一次该音乐

        {

            [fileManager removeItemAtPath:targetPath error:&error];

            if(!error)

            {

                NSLog(@"删除文件出错:%@",error);

            }

            for(FileModel *file in appDelegate.finishedlist)

            {

                if([file.fileName isEqualToString:self.fileInfo.fileName])

                {

                    [appDelegate.finishedlist removeObject:file];

                    break;

                }

            }

        }    

        //存在于临时文件夹里

        if([CommonHelper isExistFile:tempPath])

        {

            [fileManager removeItemAtPath:tempPath error:&error];

            if(!error)

            {

                NSLog(@"删除临时文件出错:%@",error);

            }

        }

        

        for(ASIHTTPRequest *request in appDelegate.downinglist)

        {

            FileModel *fileModel=[request.userInfo objectForKey:@"File"];

            if([fileModel.fileName isEqualToString:self.fileInfo.fileName])

            {

                [appDelegate.downinglist removeObject:request];

                break;

            }

        }

        self.fileInfo.isDownloading=YES;

        self.fileInfo.fileReceivedSize=[CommonHelper getFileSizeString:@"0"];

        [appDelegate beginRequest:self.fileInfo isBeginDown:YES];

    }

}



@end

MusicCell 这个类主要实现上面提到的功能，就是对单个流媒体的操作。

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