fseek
代码说明：
截取部分语音波形，并形成新文件，可以从任意点开始到任意点结束(Intercept part of the voice waveform, and the formation of a new file, you can start from any point to any end point)
文件列表：
d
.\d.cpp,3863,2011-08-31
.\d.vcproj,4144,2011-08-30
.\d.vcproj.TSINGHUA-WANG.wangld.user,1423,2011-09-05
.\Debug
.\.....\BuildLog.htm,10574,2011-08-31
.\.....\d.exe.embed.manifest,663,2011-08-31
.\.....\d.exe.embed.manifest.res,728,2011-08-31
.\.....\d.exe.intermediate.manifest,621,2011-08-31
.\.....\d.obj,9710,2011-08-31
.\.....\mt.dep,60,2011-08-31
.\.....\stdafx.obj,3605,2011-08-31
.\.....\vc90.idb,68608,2011-08-31
.\.....\vc90.pdb,69632,2011-08-31
.\ReadMe.txt,1147,2011-08-23
.\stdafx.cpp,206,2011-08-23
.\stdafx.h,233,2011-08-23
.\targetver.h,498,2011-08-23
.\test.pcm,61440,2011-08-25
.\voicedata1.dat,61440,2011-07-12
.\xiao.pcm,30242,2011-05-20
.\xiao02.pcm,10000,2011-08-31
.\xiaobei.txt,84450,2011-08-26
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