D语言下文件过滤copy的三种方式比较

module cpAmrs;
import std.stdio;
import std.file;
import std.exception;
import std.path:isValidPath,baseName;
import std.datetime;
import std.string;
import std.algorithm.searching;

extern(C) int setlocale(int, char*);

static this()
{
import core.stdc.wchar_;

fwide(core.stdc.stdio.stdout, 1);
setlocale(0, cast(char*)"china");
}

void main(string[] args)
{
writeln(" args[0] "~ args[0]);
if(args.length <=1)
{
writeln("请输入　要查找的目录　要查找的文件扩展名　　copy的目地目录");
writeln("程序自动退出!");
return;
}

writeln("准备对比!");
writeln(" start 0*************************************************************** ");
StopWatch sw;
sw.start();
cpFiles(args[1],args[2],args[3]);
sw.stop();
writeln(" cpFiles use time is ",sw.peek().msecs," msec");

writeln(" start 1*************************************************************** ");
sw.reset();
sw.start();
cpFiles1(args[1],args[2],args[3]);
sw.stop();
writeln(" cpFiles1 use time is ",sw.peek().msecs," msec");

writeln(" start 2*************************************************************** ");
sw.reset();
sw.start();
cpFiles2(args[1],args[2],args[3]);
sw.stop();
writeln(" cpFiles2 use time is ",sw.peek().msecs," msec");

}

void cpFiles(string strDir,string strExt,string cpTo)
{
import std.algorithm.iteration;
import std.algorithm.searching;
if(!isValidPath(strDir))
{
writeln(strDir ~ "is not Valid Path.");
return;
}
auto fFiles = dirEntries(strDir, SpanMode.depth).filter!(f => f.name.endsWith("."~strExt));
//if(!exists(cpTo~"\0"))
foreach(f; fFiles)
{
cpFile(f,cpTo~"0\\");
}
}

void cpFile(DirEntry f,string cpTo)
{
auto a = SysTime(DateTime.fromISOExtString("2016-03-04T20:00:00"));
auto b = SysTime(DateTime.fromISOExtString("2016-03-04T22:30:00"));
if(f.timeLastModified.opCmp(a) >= 0 && f.timeLastModified.opCmp(b) <= 0)
{
writeln("Will Copy file ",f.name);
f.copy(cpTo ~ baseName(f.name));
//string strcopy = "copy " ~ f.name ~ " " ~ "F:\\HJTZY2";
//import std.process;
//enforce(spawnShell(strcopy.dup()),"copyFile() error");
}
}

void cpFiles1(string strDir,string strExt,string cpTo)
{
if(!isValidPath(strDir))
{
writeln(strDir ~ "is not Valid Path.");
return;
}
auto dFiles = dirEntries(strDir,"{"~strExt~"}", SpanMode.depth);//.filter!(f => f.name.endsWith("."~strExt))
writeln(strDir);
foreach(f; dFiles)
{
cpFile(f,cpTo);
}
}

void cpFiles2(string strDir,string strExt,string cpTo)
{
foreach(f;dirEntries(strDir, SpanMode.depth))
{
if(!f.name.endsWith("."~strExt)) continue;
try
{
cpFile(f,cpTo~"2\\");
}
catch(Exception e)
{
writeln("file name is "~f.name," catch %s", e.msg);
}
}
}

dmd cpAmrs -release
pause
cpAmrs F:\HJTZY\1a amr f:\weixin_test\