Implementing libcurl

libcurl is a free library that can download data from the internet. It supports just about every protocol imaginable, and is available under a MIT/X derivative license.

Implementation

Windows

1. Download the latest version of libcurl.
2. Extract the \lib and \include folders to a convenient location.
3. Open libcurl's VS project and change it to Release mode.
4. Go to libcurl > Properties > C/C++ > Preprocessor > Definitions and add CURL_STATICLIB. Unless you really do want to use LDAP, and HTTP_ONLY too.
5. Go to libcurl > Properties > C/C++ > Code Generation > Runtime Library and change it to read Multi-threaded (/MT).
6. Build libcurl.
7. Add libcurl.lib to your main project. The easiest way is to drag it onto the Solution Explorer.
8. Go to Your Project > Properties > C/C++ > Preprocessor > Definitions and add CURL_STATICLIB, as you did to curl itself.
9. Go to Your Project > Properties > C/C++ > General > Additional Include Directories and add the libcurl \include folder you extracted earlier.
10. Go to Your Project > Linker > Input > Additional Dependencies and add ws2_32.lib. If you want to use LDAP, add wldap32.lib as well.
11. #include "curl/curl.h" and start coding! curl/easy.h is helpful too.

Note:Remember that you will need to repeat steps 8-10 in both Release and Debug configurations.

Linux

^[Todo]

Usage

• The libcurl C API
• Some examples

Here is how to write the contents of a web page to the console:

// Called when curl receives data from the server
size_t rcvData( void *ptr, size_t size, size_t nmemb, void *userdata)
{
	char data = char(ptr);
	char buffer[CURL_MAX_WRITE_SIZE];
	strncat(buffer,&data,size);
	Msg(buffer);
	return size;
}

void PrintPage()
{
	curl = curl_easy_init();
	curl_easy_setopt(curl, CURLOPT_URL, "curl.haxx.se");
	curl_easy_perform(curl);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, rcvData);
	curl_easy_cleanup(curl);
}

ConCommand print_page("print_page", PrintPage);