I am developing an application with C++ and libcurl. I can download and upload files fine, but I have an issue when trying to get the size of the file that I want to download from the SFTP server before downloading the file.

I am accessing an SFTP server (via sftp://). I use curl_easy_getinfo to set both CURLINFO_CONTENT_LENGTH_UPLOAD and CURLINFO_CONTENT_LENGTH_DOWNLOAD thinking that would give me the size of the file I am trying to download. Unfortunately, CURLINFO_CONTENT_LENGTH_UPLOAD returns -1.0 and CURLINFO_CONTENT_LENGTH_DOWNLOAD returns the size of the file I downloaded last. Is there a way to get the size of the file I'm trying to download before I actually download the file? Does the SFTP server need to be setup with certain attributes to allow this?

Thanks,
Chris J.
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Received on 2009-11-17