(转载)多线程下文件

（转载自COCOACHINA）

  1 NSString*FDownLoadDefaultFile;   //下载异常状态的默认文件
  2 NSString*FDownLoadLocalFilePath; //下载到本地的保存路径
  3 NSIntegerFDownLoadFileCount;     //当前下载的文件总数
  4 NSInteger FDownLoadID;            //下载序列ID
  5 
  6 
  7 NSMutableArray*FDownLoadFileArr;        //下载到本地的文件
  8 NSMutableArray*FDownLoadNetworkFilePathArr;    //需要下载到本地的网络文件路径
  9 
 10 NSCondition*FDownloadLockCondition;  //线程锁
 11 
 12 
 13 
 14 //下载文件
 15 //多线程下载文件
 16 -(void)DownloadFileByThread : (NSArray *)AFileArr                 //需要下载的文件集合数组
 17     ADownloadDirPath : (NSString *)ADownloadFilePath       //需要下载到本地的目录路径，结尾为“/”
 18 ADownloadDefaultFileURL : (NSString *)ADownloadDeaultFileURL; //如果需要下载的文件不存在，则需要下载的默认文件
 19 //下载主线程
 20 -(void)DownloadMainThread : (NSArray *)ADataArr;      //传递到线程中的数据集合，
 21       //位置0＝本地下载目录
 22 //位置1＝下载文件地址
 23       //位置2＝默认下载文件
 24 //位置3＝文件所属的位置索引号
 25 
 26 
 27 
 28 
 29 .m
 30 
 31 
 32 -(void)SetDownloadFileID : (NSInteger)AID {
 33 FDownLoadID= AID;
 34 }
 35 
 36 
 37 -(void)DownloadFileByThread : (NSArray *)AFileArr
 38     ADownloadDirPath : (NSString *)ADownloadFilePath 
 39 ADownloadDefaultFileURL : (NSString *)ADownloadDeaultFileURL {
 40 NSInteger AFileCount = [AFileArr count];
 41 NSString *ALocalFile = ADownloadFilePath;
 42 NSString *AFileName;
 43 NSString *AFileURL;
 44 NSString *ADefaultFile;
 45 NSMutableArray*ADataArr;
 46 
 47 [[NSURLCachesharedURLCache] removeAllCachedResponses];
 48 FDownLoadNetworkFilePathArr= [[NSMutableArrayalloc] initWithArray:AFileArr];
 49 FDownLoadFileArr = [[NSMutableArray alloc] initWithCapacity:AFileCount];
 50 FDownLoadFileCount= 0;
 51 FDownloadLockCondition= [[NSConditionalloc] init];
 52 
 53 for (int i = 0; i < AFileCount; i++) {
 54 [FDownLoadFileArraddObject:@""];
 55 }
 56 
 57 
 58 for (int i = 0; i < AFileCount; i++) {
 59 AFileURL = [[NSString alloc] initWithString: [AFileArr objectAtIndex : i]];
 60 AFileName = [ALocalFile stringByAppendingString:[self GetFileName:AFileURL]];
 61 
 62 ADataArr = [[NSMutableArray alloc] initWithCapacity:3];
 63 [ADataArr addObject:ALocalFile];
 64 if([[NSFileManagerdefaultManager] fileExistsAtPath:AFileName] == NO) {
 65 //NSLog(@"%@",AFileURL);
 66 [ADataArr addObject:AFileURL];
 67 [ADataArr addObject:ADownloadDeaultFileURL];
 68 [ADataArr addObject:[[NSStringalloc] initWithFormat:@"%d",i]];
 69 
 70 [NSThreaddetachNewThreadSelector:@selector(DownloadMainThread:) toTarget:selfwithObject:ADataArr];
 71 [ADataArr release];
 72 }
 73 else {
 74 //NSLog(@"%@",AFileName);
 75 if (AFileURL == @"") {
 76 ADefaultFile = [ALocalFile stringByAppendingString:[self GetFileName:ADownloadDeaultFileURL]];
 77 if ([[NSFileManager defaultManager] fileExistsAtPath:ADefaultFile] == NO) {
 78 [ADataArr addObject:ADownloadDeaultFileURL];
 79 [ADataArr addObject:ADownloadDeaultFileURL];
 80 [ADataArr addObject:[[NSStringalloc] initWithFormat:@"%d",i]];
 81 [NSThreaddetachNewThreadSelector:@selector(DownloadMainThread:) toTarget:selfwithObject:ADataArr];
 82 [ADataArr release];
 83 }
 84 else {
 85 FDownLoadFileCount++;
 86 [FDownLoadFileArrreplaceObjectAtIndex:i withObject:ADefaultFile];
 87 //[FDownLoadFileArr addObject:ADefaultFile];
 88 }
 89 }
 90 else {
 91 FDownLoadFileCount++;
 92 [FDownLoadFileArrreplaceObjectAtIndex:i withObject:AFileName];
 93 //[FDownLoadFileArr setValue:AFileName forKey:[[NSString alloc] initWithFormat:@"%d",i]];
 94 //[FDownLoadFileArr addObject:AFileName];
 95 }
 96 
 97 
 98 }
 99 
100 
101 
102 }
103 if(FDownLoadFileCount== [FDownLoadNetworkFilePathArrcount]) {   //完成全部下载
104 [self.delegate DownLoadFileDidFinish:FDownLoadFileArr AID : FDownLoadID];
105 [FDownLoadNetworkFilePathArrrelease];
106 [FDownLoadFileArrrelease];
107 [FDownloadLockConditionrelease];
108 
109 }
110 }
111 
112 
113 -(void)DownloadMainThread : (NSArray *)ADataArr {
114 NSString *ALocalFile = [ADataArr objectAtIndex:0];
115 //NSLog(@"%@",[ADataArr objectAtIndex:1]);
116 NSURL*AURL = [[NSURLalloc] initWithString:[ADataArr objectAtIndex:1]];
117 NSData *AFileData = [[NSData alloc] initWithContentsOfURL:AURL];
118 if (AFileData != nil) {
119 ALocalFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:1]]]; 
120 //NSLog(@"%@",ALocalFile);
121 [AFileData writeToFile:ALocalFile atomically:YES];
122 }
123 else{    //不存在指定路径的文件，使用默认文件
124 NSString *ADefaultFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:2]]];
125 if ([[NSFileManager defaultManager] fileExistsAtPath:ADefaultFile] == NO) {
126 [AURL release];
127 [AFileData release];
128 AURL = [[NSURLalloc] initWithString:[ADataArr objectAtIndex:2]];
129 AFileData = [[NSData alloc] initWithContentsOfURL:AURL];
130 if (AFileData != nil) {
131 ALocalFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:1]]]; 
132 [AFileData writeToFile:ALocalFile atomically:YES];
133 }
134 else {
135 ALocalFile = [DocumentPathstringByAppendingString:@"default.png"];
136 }
137 
138 
139 }
140 
141 }
142 //NSLog(@"ADataArr = %@",[ADataArr objectAtIndex:3]);
143 [FDownloadLockConditionlock];    //上锁
144 FDownLoadFileCount++;
145 [FDownLoadFileArrreplaceObjectAtIndex:[[ADataArr objectAtIndex:3] intValue] withObject:ALocalFile];
146 [FDownloadLockConditionunlock];  //解锁
147 
148 [AURL release];
149 [ALocalFile release];
150 [AFileData release];
151 
152 
153 if(FDownLoadFileCount== [FDownLoadNetworkFilePathArrcount]) {   //完成全部下载
154 [self.delegate DownLoadFileDidFinish:FDownLoadFileArr AID : FDownLoadID];
155 [FDownLoadNetworkFilePathArrrelease];
156 [FDownLoadFileArrrelease];
157 [FDownloadLockConditionrelease];
158 
159 }
160 }

posted on 2011-07-25 17:01  east520  阅读(218)  评论(0)    收藏  举报

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