Multiple input files

[ncoder-1]

Hi,

I was wondering if there's a built-in way to open multiple (same layout) csv files into one CSVReader object? I have 2 (sometimes 3) csv files that have the exact same column structure that I would like to open into one concatenated CSVReader object.

I am trying to avoid concatenating the csv files on disk prior to reading them with CSVReader and I'd like to avoid having 2-3 individual CSVReader objects to handle.

Basically, I'm wondering if there's another input option (say a vector of strings) instead of a direct filename such as below:

io::CSVReader<8, io::trim_chars<' '>, io::double_quote_escape<',', '\"'> > in(Filename);

Thanks!

[ben-strasser]

Hi, there is no built in way. What I have personally done in the past to achieve this was to implement was to implement my own ByteSource. The derived class essentially contained an ifstream, a counter, and a basename. The class first tried to open basename + to_string(counter). If it succeeded, it read the content, incremented the counter, and then tried to open basename + to_string(counter). If opening failed, it returned 0 to indicate an EOF. (The class also additionally implemented on-the-fly zip decompression but that is beside the point of the question.) Best Regards Dr. Ben Strasser

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On 09/27/2018 05:56 PM, elimpnick wrote: Hi, I was wondering if there's a built-in way to open multiple (same layout) csv files into one CSVReader object? I have 2 (sometimes 3) csv files that have the exact same column structure that I would like to open into one concatenated CSVReader object. I am trying to avoid concatenating the csv files on disk prior to reading them with CSVReader and I'd like to avoid having 2-3 individual CSVReader objects to handle. Basically, I'm wondering if there's another input option instead of a direct filename such as below: |io::CSVReader<8, io::trim_chars<' '>, io::double_quote_escape<',', '\"'> > in(Filename);| Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#74>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ALaAj5U2z-w7xSsjyWWsEdBiEIsB6T_Kks5ufPUVgaJpZM4W897k>.

[ncoder-1]

I see, thanks for the answer and the great library!