Re: [racket-users] upload file with http post an Content-Type is multipart/form

在 2016年1月9日星期六 UTC+8上午10:32:24，Neil Van Dyke写道： > One problem is that you should have *two* CR-LF byte sequences to > terminate the header list in each MIME multipart part. > > For example, instead of: > > "--" boundary CRLF > "Content-Disposition: form-data; name=\"file\"; > filename

[racket-users] upload file with http post an Content-Type is multipart/form

Hi, I have a problem when upload file through http post method. Here is my code: #lang racket (require net/uri-codec) (require net/url) (require json) (require net/http-client) (define (->string bs) (if (bytes? bs) (bytes->string/utf-8 bs) bs)) (define (->bytes str) (cond [(s

[racket] how can I convert a list or vector to ctype array directly?

Instead through iteration like for or do which assign values to element of array, deliver list or vector directly to the ctype function imported by ffi. Because I think that operating the list or vector with built-in functions is more conveniently than the ctype array. In the reference, I find _a

[racket] how to create a ctype array

in the reference, I see the _array function, but I don't understand well, when i try to do, always output errors, can anyone give me an example? here is my test in REPL:racket@> (_array _int 3)#racket@> (array? (_array _int 3))    ; why?#fracket@> Racket Users list: http://