Thread: Edit controls and numbers

str8 Win32 API

I know you can restrict the input to positive integers, but I don't thinkyou can do it with floats.
You could allow the user to enter whatever gibberish he wants, but when he pressed OK (or whatever) you run some code to see if the input is valid. If it's not, pop up a message telling so.

Or you could write your own input edit control...
(FOOTNOTE: Don't ask me how to do that)

The ES_NUMBER style will not allow non-digits to be entered, however, I can't remember off the top of my head if it allows minus signs and decimal points. Try it.

If it doesn't work, subclass the editbox and dump any unwanted messages. The program below is an example of subclassing I wrote for someone else, change it so that if the WM_CHAR is a character you want, pass the message on to the edit control, if not just dump it.

Thanks guys, I wrote my own Edit Class in the end with a function to clear out any non valid text from a string - this code is run every time a key is entered, a little innefficient perhaps but it works! There are also (I eventually found) a couple of really nifty functions in stdio.h that convert strings to numbers (I managed to write my own but encountered some strange mathematical accuracy results like "87.99" -> 87.990000003 ???!).

For future reference they are:

Code:

double atof(char *string) -- Convert string to floating point value. 
int atoi(char *string) -- Convert string to an integer value 
int atol(char *string) -- Convert string to a long integer value.

Just bunged in a GetNumber method to my Edit class that uses those functions and bobs your uncle!