文件名称:用ftp协议完成多线程断点续传的源码
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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
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
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压缩包 : 11912902用ftp协议完成多线程断点续传的源码.rar 列表 project\MultiThreadDealScoket.obj project\MultiFtp.~cpp project\MultiFtp.~h project\MultiFtp.cpp project\MultiFtp.h project\MultiFtp.obj project\MultiFtpDownloadThread.~cpp project\MultiFtpDownloadThread.~h project\MultiFtpDownloadThread.cpp project\MultiFtpDownloadThread.h project\MultiFtpDownloadThread.obj project\MultiThreadDataClass.~cpp project\MultiThreadDataClass.~h project\MultiThreadDataClass.cpp project\MultiThreadDataClass.h project\MultiThreadDataClass.obj project\MultiThreadDealScoket.~cpp project\MultiThreadDealScoket.~h project\MultiThreadDealScoket.cpp project\MultiThreadDealScoket.h project 说明.txt