如何在Erlang的目錄中複製文件？

Question

這工作：

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

但這並不：

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

我怎樣才能在二郎跨目錄中的文件複製？

非常感謝，

LRP

Answer 1

一些大的文件會導致問題，當你複製/二郎內移動它們。使用os:cmd/1有時更安全。像這樣：

 
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]). 

Answer 2

的問題是，sites/test.html有特殊字符，必須是單引號內。嘗試：

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

或者你也可以使用字符串：

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