(转载)多线程下文件

NSString*FDownLoadDefaultFile;   //下载异常状态的默认文件
NSString*FDownLoadLocalFilePath; //下载到本地的保存路径
NSIntegerFDownLoadFileCount;     //当前下载的文件总数
NSInteger FDownLoadID;            //下载序列ID

NSMutableArray*FDownLoadFileArr;        //下载到本地的文件
NSMutableArray*FDownLoadNetworkFilePathArr;    //需要下载到本地的网络文件路径

NSCondition*FDownloadLockCondition;  //线程锁

//下载文件
//多线程下载文件
-(void)DownloadFileByThread : (NSArray *)AFileArr                 //需要下载的文件集合数组
ADownloadDirPath : (NSString *)ADownloadFilePath       //需要下载到本地的目录路径，结尾为“/”
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
//下载主线程
-(void)DownloadMainThread : (NSArray *)ADataArr;      //传递到线程中的数据集合，
//位置0＝本地下载目录
//位置1＝下载文件地址
//位置2＝默认下载文件
//位置3＝文件所属的位置索引号

.m

-(void)SetDownloadFileID : (NSInteger)AID {
FDownLoadID= AID;
}

-(void)DownloadFileByThread : (NSArray *)AFileArr
ADownloadDirPath : (NSString *)ADownloadFilePath
ADownloadDefaultFileURL : (NSString *)ADownloadDeaultFileURL {
NSInteger AFileCount = [AFileArr count];
NSString *ALocalFile = ADownloadFilePath;
NSString *AFileName;
NSString *AFileURL;
NSString *ADefaultFile;
NSMutableArray*ADataArr;

[[NSURLCachesharedURLCache] removeAllCachedResponses];
FDownLoadNetworkFilePathArr= [[NSMutableArrayalloc] initWithArray:AFileArr];
FDownLoadFileArr = [[NSMutableArray alloc] initWithCapacity:AFileCount];
FDownLoadFileCount= 0;
FDownloadLockCondition= [[NSConditionalloc] init];

for (int i = 0; i < AFileCount; i++) {
[FDownLoadFileArraddObject:@""];
}

for (int i = 0; i < AFileCount; i++) {
AFileURL = [[NSString alloc] initWithString: [AFileArr objectAtIndex : i]];
AFileName = [ALocalFile stringByAppendingString:[self GetFileName:AFileURL]];

ADataArr = [[NSMutableArray alloc] initWithCapacity:3];
[ADataArr addObject:ALocalFile];
if([[NSFileManagerdefaultManager] fileExistsAtPath:AFileName] == NO) {
//NSLog(@"%@",AFileURL);
[ADataArr addObject:AFileURL];
[ADataArr addObject:ADownloadDeaultFileURL];
[ADataArr addObject:[[NSStringalloc] initWithFormat:@"%d",i]];

[NSThreaddetachNewThreadSelector:@selector(DownloadMainThread:) toTarget:selfwithObject:ADataArr];
[ADataArr release];
}
else {
//NSLog(@"%@",AFileName);
if (AFileURL == @"") {
ADefaultFile = [ALocalFile stringByAppendingString:[self GetFileName:ADownloadDeaultFileURL]];
if ([[NSFileManager defaultManager] fileExistsAtPath:ADefaultFile] == NO) {
[ADataArr addObject:ADownloadDeaultFileURL];
[ADataArr addObject:ADownloadDeaultFileURL];
[ADataArr addObject:[[NSStringalloc] initWithFormat:@"%d",i]];
[NSThreaddetachNewThreadSelector:@selector(DownloadMainThread:) toTarget:selfwithObject:ADataArr];
[ADataArr release];
}
else {
FDownLoadFileCount++;
[FDownLoadFileArrreplaceObjectAtIndex:i withObject:ADefaultFile];
//[FDownLoadFileArr addObject:ADefaultFile];
}
}
else {
FDownLoadFileCount++;
[FDownLoadFileArrreplaceObjectAtIndex:i withObject:AFileName];
//[FDownLoadFileArr setValue:AFileName forKey:[[NSString alloc] initWithFormat:@"%d",i]];
//[FDownLoadFileArr addObject:AFileName];
}

}

}
if(FDownLoadFileCount== [FDownLoadNetworkFilePathArrcount]) {   //完成全部下载
[self.delegate DownLoadFileDidFinish:FDownLoadFileArr AID : FDownLoadID];
[FDownLoadNetworkFilePathArrrelease];
[FDownLoadFileArrrelease];
[FDownloadLockConditionrelease];

}
}

-(void)DownloadMainThread : (NSArray *)ADataArr {
NSString *ALocalFile = [ADataArr objectAtIndex:0];
//NSLog(@"%@",[ADataArr objectAtIndex:1]);
NSURL*AURL = [[NSURLalloc] initWithString:[ADataArr objectAtIndex:1]];
NSData *AFileData = [[NSData alloc] initWithContentsOfURL:AURL];
if (AFileData != nil) {
ALocalFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:1]]];
//NSLog(@"%@",ALocalFile);
[AFileData writeToFile:ALocalFile atomically:YES];
}
else{    //不存在指定路径的文件，使用默认文件
NSString *ADefaultFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:2]]];
if ([[NSFileManager defaultManager] fileExistsAtPath:ADefaultFile] == NO) {
[AURL release];
[AFileData release];
AURL = [[NSURLalloc] initWithString:[ADataArr objectAtIndex:2]];
AFileData = [[NSData alloc] initWithContentsOfURL:AURL];
if (AFileData != nil) {
ALocalFile = [ALocalFile stringByAppendingString:[self GetFileName:[ADataArr objectAtIndex:1]]];
[AFileData writeToFile:ALocalFile atomically:YES];
}
else {
ALocalFile = [DocumentPathstringByAppendingString:@"default.png"];
}

}

}
//NSLog(@"ADataArr = %@",[ADataArr objectAtIndex:3]);
[FDownloadLockConditionlock];    //上锁
FDownLoadFileCount++;
[FDownLoadFileArrreplaceObjectAtIndex:[[ADataArr objectAtIndex:3] intValue] withObject:ALocalFile];
[FDownloadLockConditionunlock];  //解锁

[AURL release];
[ALocalFile release];
[AFileData release];

if(FDownLoadFileCount== [FDownLoadNetworkFilePathArrcount]) {   //完成全部下载
[self.delegate DownLoadFileDidFinish:FDownLoadFileArr AID : FDownLoadID];
[FDownLoadNetworkFilePathArrrelease];
[FDownLoadFileArrrelease];
[FDownloadLockConditionrelease];

}
}