erlang，将整数值写入文件
我想将整数值打印到文件中。我可以将字符串值写入文件，但是当我尝试写入整数值时，会出现错误：
%this works fine
{ok, F}=file:open("bff.txt", [read,write]),
Val="howdy",
file:write(F,Val).
%this gets compiled, but results in error {error, badarg} while executing
{ok, F}=file:open("bff.txt", [read,write]),
Val=23424,
file:write(F,Val).
有什么建议吗？
实际上，我想为 Web 服务器编写一个基准测试代码，我需要将所有时间值和请求数写入输出文件，然后我将使用它通过 gnuplot 绘制图形。
I want to print integer values to a file. I am able to write string values to the file, but when I try to write an integer value it gives an error:
%this works fine
{ok, F}=file:open("bff.txt", [read,write]),
Val="howdy",
file:write(F,Val).
%this gets compiled, but results in error {error, badarg} while executing
{ok, F}=file:open("bff.txt", [read,write]),
Val=23424,
file:write(F,Val).
Any suggestions?
Actually I want to write a benchmarking code for a web server and I need to write all the values of times and no of requests to an output file, and then I'll use it to plot graph with gnuplot.
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使用
integer_to_list/1将整数转换为file:write/2的列表。Use
integer_to_list/1to convert integers to a list forfile:write/2.这是因为
file:write只能输出字符串。另一种方法是使用 io 模块中的函数，这些函数也可以处理文件。所以 io:write(File, Val) 将会起作用。您也可以使用格式化 io 函数io:format。这实际上取决于您希望如何格式化数据以及如何读取它们，如果您打算读取它们，仅使用 io:write 写入整数将不会很有用。This is because
file:writeonly can output strings. An alternative is to use functions in theiomodule which also work on files. Soio:write(File, Val)will work. You can alternatively use formatted io functionsio:format. It really depends how you wish to format the data and how they are to be read, just writing integers withio:writewill not be very useful if you intend to read them.您可以使用 term_to_binary 和 binary_to_term：
You may use term_to_binary and binary_to_term: