Question

I want to extract information from a Visio file and do some change on them(like using C++), then write them back?

My question is:

Is manipulating visio files(mainly reading and writing) programmingly possible?

If so, any tutorial lin is preferred

Answer 1

Reading/Writing Visio VSD Files
This is a binary format and as far as I know, it is not documented. However, check out what has been going with support for reading Visio VSD files in LibreOffice.

Reading/Writing Visio VDX files
These are just the XML equivalent of VSD files and relatively straightforward to read and write if you are familiar with Visio. For simple tasks such as finding and manipulating all shape custom properties or formatting it will be very straightforward to load the XML into a DOM, process it, and then save it back out. For example, I once wrote a small tool that used this technique to search and replace text in a set of VDX files. One warning: the more complex a task you want to perform, the more you will need to be very familiar with Visio and how it works with Shapesheets, etc.

Here’s a link to get started: http://msdn.microsoft.com/en-us/library/aa218409(v=office.10).aspx