Posting on a wordpress blog using PHP

For one of my projects I'm trying to write an external php program that needs to post on a wordpress blog after processing some data.
Both php code and wordpress blog are hosted on the same domain and both can have access to the same database.

I know that I can write the php code from scratch to write the post directly to wordpress's mysql database but I was wondering if there is such a code already or someone has any better idea to do it (i.e. using wordpress includes and internal functions maybe) ?

Thanks in advance

 

maybe you can use the email to post function in wordpress..to use php to email to a specific email, then wordpress will automatically add a new post depend on the email content.

 

Thanks, that's a great and easy solution but is there any way to specify different category for each post ?

 

maybe you can use the XMLRPC...

 

can u explain more about this..i want to know too..

 

http://codex.wordpress.org/XML-RPC_Support

 

if you wanna use the wp api's you can try wp_insert_post() which needs to include some wp files !
or if you want to add data without wp api's you have to insert to mysql database directly (with php).

codex.wordpress.org/Function_Reference/wp_insert_post