background:

1.what is Jabber,go to here: http://www.jabber.org
It is now a part of Cisco.

2.Xmpp,xmpp client,psi,gtalk,TLS,etc.If you dont know what is it ?please let Google tell you.
3.Download gloox from http://camaya.net/gloox
  I used the Latest stable version: 0.9.9.7
4.Use Vc6 + PlatformSDK of windows to build gloox
5.Open src/examples/ to test your gTalk account.

please pay attention to the config.h file:

/**
* Uncomment whichever lib you have installed.
*/

/* Uncomment if you have zlib available and want to use it */
// #define HAVE_ZLIB 1

/* Comment out if you don't want to use Win's native TLS functions */
#define HAVE_WINTLS 1

/* Uncomment if you have GnuTLS available and want to use it */
// #define HAVE_GNUTLS 1

/* Uncomment if you have OpenSSL available and want to use it */
// #define HAVE_OPENSSL 1

/* Uncomment if you have LibIDN available and want to use it */
// #define HAVE_LIBIDN 1

/* Comment out if you don't have windns.h (e.g. if you use an old Platform SDK) */
#define HAVE_WINDNS_H 1

/* Comment out if you don't have setsockopt() */
#define HAVE_SETSOCKOPT 1

开源界有很多 xmpp的client，我没有仔细去研究过，但用gloox封装好的，然后输入gtalk的账号和密码，就可以和你的gtalk朋友chat了。感觉非常的哈。长时间与code打交道，也悟出不少道理：软件开发分好几层，底层的犹如honeywell的或者DT，做通用的零部件。MS属于通吃，不但做零部件，还做终端。不管在产业链的哪个部位，都可以做好，天下事都如此。但当然做的越核心越好，门槛高，对手少，古曰内功。做方案的也可以做的很好，山寨里也有贫穷富裕。懂得站在巨人肩膀上的人终究会成功，软件更是如此。空了做一个 PSI 自己玩玩。

reference:

http://code.google.com/p/icalk/