CSV Data to Binary File

[TJB via Digitalmars-d-learn]

Thanks Marc. Not sure what to do here. I need to the binary data 
to be exactly the number of bytes as specified by the struct.

How to handle the conversion from string to char[]?

TJB

> (You forgot to include the error. For other readers: It fails 
> to compile with "template std.conv.toImpl cannot deduce 
> function from argument types !(char[4])(string)" and similar 
> error messages.)
>
> This is caused by the two `char` arrays. `std.conv.to` cannot 
> convert strings to fixed-size char arrays, probably because 
> it's not clear what should happen if the input string is too 
> long or too short.
>
> Would it be a good idea to support this?
>
> As a workaround, you could declare a second struct with the 
> same members, but `ex` and `mmid` as strings, read your data 
> into these, and assign it to the first structure:
>
> import std.algorithm;
> import std.csv;
> import stdio = std.stdio;
> import std.stream;
>
> align(1) struct QuotesBinDummy
> {
>   int qtim;
>   int bid;
>   int ofr;
>   int bidsiz;
>   int ofrsiz;
>   short mode;
>   string ex;
>   string mmid;
> }
>
> align(1) struct QuotesBin
> {
>   int qtim;
>   int bid;
>   int ofr;
>   int bidsiz;
>   int ofrsiz;
>   short mode;
>   char[1] ex;
>   char[4] mmid;
> }
>
>
> void main()
> {
>   string infile = "temp.csv";
>   string outfile = "temp.bin";
>   Stream fin = new BufferedFile(infile);
>   Stream fout = new BufferedFile(outfile, FileMode.Out);
>
>   foreach(ulong n, char[] line; fin)
>   {
>     auto temp = csvReader!QuotesBinDummy(line).front;
>     QuotesBin record;
>     record.tupleof = temp.tupleof;
>     fout.writeExact(&record, QuotesBin.sizeof);
>   }
>
>   fin.close();
>   fout.close();
> }
>
> The line "record.tupleof = temp.tupleof;" will however fail 
> with your example data, because the `ex` field includes a space 
> in the CSV, and the last field is empty, but needs to be 4 
> chars long.