用ftp协议完成多线程断点续传的源码

所属分类:Windows编程
开发工具:Visual C++
文件大小:94KB
下载次数:85
上传日期:2005-11-16 09:29:07
上 传 者bluesnowst
说明:   各个线程任务分配是这样实现的。在开始下载时,文件平均分成若干块进行下载。如第一个线程一开始的任务是从文件的0位置开始下载一直到72908位置处。线程1每次下载一块数据后就要调整任务,如第一次下载了20800字节的数据,那么线程1的任务将改为:20800-72908。如此下去,直到任务为72908-72908时表示线程1完成了当前的下载任务。此时,线程1就分析各个线程的任务,找出任务最为繁忙的一个线程:如线程3:14816-218724。那么线程1就自动去调整任务,拿50%的任务来再次下载。周而复始直到各个线程都完成任务。不过这里有一点需要注意:为了避免重复下载部分数据,在调整任务的时候,起始的文件便移量必须加上接受缓冲器的字节数,因为如前面所举的列子来看。线程1和线程3在平衡负载的时候,线程正在下载数据,如果所剩的数据比接受缓冲器的大小还小,线程1和线程3的部分下载数据将会重复。   在调整任务和分析任务的时候,会发现一个问题。就是读取文件数据太过频繁。于是我用了一个数据结构。在下载文件的过程中始终打开配置文件,这样速度提高了很多。在文件下载完毕后关闭文件。
(various threads assignment is achieved. At the beginning of the download, the paper divided into a number of pieces of the download. As a thread of a task is to start from the position paper of 0 to start the download has 72,908 locations Department. Thread a download each one will have to adjust the data tasks, such as the first downloaded 20,800 gigabytes of data, then threaded a task will be re :20800- 72908. This situation continues until the mandate of 72908-72908 said threaded a completion of the current mandate of the download. At this point, a thread on the analysis of the various threads of tasks, the most heavy task to find a thread : If 3:14816-218724 threads. Then a threaded automatically adjust the mandate, with 50% of the tasks to be downloaded again. Thread cycle until all )

文件列表:
project\MultiThreadDealScoket.obj (114150, 2005-01-12)
project\MultiFtp.~cpp (22093, 2005-01-14)
project\MultiFtp.~h (4585, 2005-01-14)
project\MultiFtp.cpp (22242, 2005-01-14)
project\MultiFtp.h (4585, 2005-01-14)
project\MultiFtp.obj (85777, 2005-01-14)
project\MultiFtpDownloadThread.~cpp (7513, 2005-01-14)
project\MultiFtpDownloadThread.~h (2203, 2005-01-13)
project\MultiFtpDownloadThread.cpp (7518, 2005-01-14)
project\MultiFtpDownloadThread.h (2203, 2005-01-13)
project\MultiFtpDownloadThread.obj (45660, 2005-01-14)
project\MultiThreadDataClass.~cpp (332, 2005-01-12)
project\MultiThreadDataClass.~h (424, 2005-01-12)
project\MultiThreadDataClass.cpp (332, 2005-01-12)
project\MultiThreadDataClass.h (666, 2005-01-13)
project\MultiThreadDataClass.obj (12606, 2005-01-13)
project\MultiThreadDealScoket.~cpp (1467, 2005-01-12)
project\MultiThreadDealScoket.~h (443, 2005-01-12)
project\MultiThreadDealScoket.cpp (2528, 2005-01-12)
project\MultiThreadDealScoket.h (532, 2005-01-12)
project (0, 2005-01-21)
说明.txt (9158, 2005-11-16)

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