Libcurl download file

Also, this call assigns the count of currently running curl easy handles to the second argument. If this value is equal to 0, it means all operations have finished. If the value is negative, libcurl has no timeout set and we should wait, say, milliseconds.

The maxfd parameter is set to the value of the maximum file descriptor. During execution of this loop, all curl easy handles will receive data and write it to a file. You can find the code for the whole loop here. Finally, after executing all requests, we need to remove curl easy handles from the multi handle:. Multiplexing allows for reusing a single connection to one server for processing multiple HTTP requests. This method can improve the performance of request-heavy applications by eliminating the need to close and reopen server connections.

We can reuse the asynchronous example and add this code between setting options for curl easy handles and add curl easy handles to the curl multi handle step 3 in the previous section :. If detected, such a connection will be used instead of creating a new connection. You can find the full source code of all examples from this article on our GitHub page. Downloading files is one of the basic activities any application should be able to perform.

The three most widely used file downloading methods are multiplexing, synchronous, and asynchronous. Each has its advantages and drawbacks and is best used in specific cases.

By clicking OK you give consent to processing your data and subscription to Apriorit Blog updates. If so, it means the library I built is not functioning. I am not familiar with server certificates.

Can you give me more information about schannel support. I rebuilt the Libcurl library without openSSL support. The program works and it actually downloaded the file. I searched my windows directory and found it already contains schannel. Thanks a lot. Yes, schannel is a built-in Windows component. Lubcurl will use it by default, if no other SSL library is provided.

Winsoft Winsoft 1. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Who owns this outage? Building intelligent escalation chains for modern SRE. Podcast Who is building clouds for the independent developer? Libcurl is free, thread-safe, IPv6 compatible, feature rich, well supported, fast, thoroughly documented and is already used by many known, big and successful companies.

Go to the regular curl download page and get the latest curl package, or one of the specific libcurl packages listed. You use libcurl with the provided C API. Open Source libcurl ver: 7.