Question

这有效：

1> file:copy(test.html, test1.html).
{ok,2384}

但这不是：

2> file:copy(test.html, sites/test.html). 
   ** exception error: bad argument in an arithmetic expression
   in operator  '/'/2
   called as sites / 'test.html'

如何在Erlang中跨目录复制文件？

非常感谢，

LRP

Answer 1

问题是sites/test.html有特殊字符，必须在单引号内。尝试：

file:copy(test.html, 'sites/test.html').

或者您可以使用字符串：

file:copy("test.html", "sites/test.html").

Answer 2

在erlang中复制/移动它们时，某些大文件会导致问题。使用os:cmd/1有时更安全。像这样：

move(Source, Destination)->
    %% For Windows
    Command = "MOVE \"" ++ Source ++ "\" \"" ++ Destination ++ "\"",
    %% For Unix/Linux
    %%Command = "mv \"" ++ Source ++ "\" \"" ++ Destination ++ "\"",
    spawn(os,cmd,[Command]).

copy(Source, Destination)->
    %% For Windows
    Command = "XCOPY \"" ++ Source ++ "\" \"" ++ Destination ++ "\"",
    %% For Unix/Linux
    %%Command = "cp \"" ++ Source ++ "\" \"" ++ Destination ++ "\"",
    spawn(os,cmd,[Command]).

如何在Erlang中跨目录复制文件？

2 个答案: