Hi Thieny1,
CVI does not have any specific functions to mimic and run block diagrams from Visio. However, it does have ActiveX capabilities. You can try to place a Visio ActiveX control on the user interface, and run your block diagram inside it.
Here is a tutorial on ActiveX and CVI.
This is a link that describes the functionality of ActiveX in CVI.
Here is a link to a msdn website about Visio's ActiveX control.
Hope this helps. Good Luck!
Jeremy L.
National Instruments
Jeremy L.
National Instruments