C++ code to download file from server

Next, we need to deal with SSL connections. Note : Nevertheless, curl provides multiple options for verifying server certificates. By default, curl will print downloaded data to the console, which is useful for testing purposes. Once the request is executed, libcurl will check everything for errors and output the error string to the std::cerr object. In asynchronous file downloading, all requests are executed in an arbitrary order.

For asynchronous downloading, we still need to create curl easy handles and set options for them. So the first seven steps will be the same as for synchronous downloading. However, asynchronous downloading in libcurl can be achieved through the curl-multi interface. With a multi handle and the curl-multi interface, you can perform several simultaneous transfers in parallel. In this case, every separate transfer will be built around a separate curl easy handle.

Using the created guard, we can now create a curl multi handle. Similar to the previous example, we create three curl easy handles for downloading three sample files:. 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. Security: Handled by encryption. Algorithm : 1.

The server starts and waits for filename. The client sends a filename. The server receives filename. If file is present, server starts reading file and continues t o send a buffer filled with file contents encrypted until file-end is reached.

End is marked by EOF. File is received as buffers until EOF is received. Then it is decrypted. If Not present, a file not found is sent. Collectives on Stack Overflow. Learn more. Asked 6 years, 2 months ago. Active 5 months ago. Viewed 19k times. Bombertoman Bombertoman 21 1 1 gold badge 1 1 silver badge 3 3 bronze badges.

Sorry for my ignorance, but how can I know? Add a comment. Active Oldest Votes. Mariusz Mariusz 1 1 silver badge 5 5 bronze badges. Basile Starynkevitch Basile Starynkevitch k 16 16 gold badges silver badges bronze badges. Ok I downloaded the libcurl library I looked up for it but I couldn't find it I'm really a newbie, so I'm sorry if my questions look obvious