如何验证在TEdit中输入的值以及如何限制TMaskEdit仅允许数字？

Question

I need help with doing validation for certain controls.

Question 1:
I have a TEdit control on my form. I would like to check whether the data entered by the user is either an alphabet or a number.

Question 2:
I have a TMaskEdit control on my form and I want to restrict users to enter only numbers.

Can anybody post code samples how to do that ?
Any help is appreciated.

Answer 1

I have a TEdit control in my form. I would like to check whether the data entering by the user is either an alphabet or a number.

Look at the TryStrToInt() function in the SysUtils unit. If it returns True, the text is a valid number.

I have a TMaskEdit control in my form . and I want the user to enter only numbers.

Read the documentation on how the TMaskEdit.EditMask property works. Set the mask to contain as many '#' characters as you want to allow users to enter digits.

Altrnatively, switch to TEdit and use the SetWindowsLong() function to give it the ES_NUMBER style.