Doubt regarding capture

[claudneysessa]

Good night friends, I'm using your package which is just fantastic, but I had to make a limitation of the camera to search only a certain area because today it searches for everything that is visible.

Would you like to make this limitation of the capture area so that it is restricted to a square or how most readers put that red stripe for the guy to position the bar code?

another question: How would I do it to only detect and capture data if I press a button?