Hi ZhengQi,
If i need to build a GUI to let user select operation mode at first.If needed,how can i implement it?
That's up to you, but most, including myself, have opted to select the mode based on the command line.
Hope this helps,
Michael Morris
Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction. - Ernst F. Schumacher