[From http to AWS] [4] Using libcurl with OpenSSL support

In fact, libcurl has binding in many languages. I prefer C ++, but since curlpp is too troublesome, I directly use libcurl in C language.

> Build OpenSSL

Download OpenSSL from www.openssl.org and install the Perl Environment

1> perl Configure VC-WIN32 --prefix=c:/some/openssl/dir

2> ms\do_ms
3> nmake -f ms\nt.mak (for static library)

Or

3> nmake -f ms\ntdll.mak (for DLL)

> Build libcurl

Download libcurl from http://curl.haxx.se and open vc6curl. DSW compilation.

Do you have use_ssleay and use_openssl in Preprocessor?

 

>> Certification

Http://curl.haxx.se/docs/sslcerts.html

Libcurlloads A certdata.txt file from mozillaand generates the desired *. CRT file.

'Http: // mxr.mozilla.org/seamonkey/source/security/nss/lib/ckfw/builtins/certdata.txt? Raw = 1'

Run Perl script to generate a ca-bundle.crt using OpenSSL, and then configure curlopt_cainfo:

// Run this script to generate the ca-bundle.crt

S: \ Components \ cplusplus \ curl-7.20.0 \ Lib \ mk-ca-bundle.pl

If the configuration fails, curle_ssl_cacert is returned when you access HTTPS.

> Libcurl

In the simplest example, retrieve the content of the http://curl.haxx.se/docs/thanks.html page and write it to a local file.
Although it is better than Python's urllib.

For easy interface, the basic steps are as follows:

Initialize libcurl

Initialize easy interface

Set the required Option

Execute request

Clear easy interface

Clear libcurl

Code:

// Configure //--------------------------------------------------------------------------------------------------------

// Initialize libcurl

//

Curlcode return_code;

Return_code = curl_global_init (curl_global_win32 );

If (curle_ OK! = Return_code) return;

// Get easy handle

//

Curl * easy_handle = curl_easy_init ();

If (null = easy_handle)

{

Curl_global_cleanup ();

Return;

}

// Open a local file

//

File * fp = fopen ("C: \ thanks.html", "AB + ");
// Set easy handle properties

//

Curl_easy_setopt (easy_handle, curlopt_url, "http://curl.haxx.se/docs/thanks.html ");

Curl_easy_setopt (easy_handle, curlopt_writefunction, & process_data );

Curl_easy_setopt (easy_handle, curlopt_writedata, FP );

// Perform request

//

Curl_easy_perform (easy_handle );
// Close file

//

Fclose (FP );

// Clean up curl

//

Curl_easy_cleanup (easy_handle );

Curl_global_cleanup ();

// Configure //--------------------------------------------------------------------------------------------------------