"Turn" Delphi character intercept function leftstr/midstr/rightstr and copy usage

Original: http://blog.csdn.net/hansoy/article/details/44941159

If the string is dstr:= ' Delphi are the best ', then

Leftstr (DSTR, 5): = ' Delph ' is intercepted from left to right, length 5

Midstr (DSTR, 6, 7): = ' i is th ' starting from 6th character intercept, length is 7

Rightstr (DSTR, 6): = ' e best ' is intercepted from right to left, length is 6

Note: These functions are included in strutils, so you need to uses strutils

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Attach the copy to the use, and compare with Leftstr:

Leftstr (Dm.qry1.FieldByName (' field1 '). Asstring, 10)

Copy (Dm.qry1.FieldByName (' field1 '). asstring,1,10)

The above two results are equal.

"Turn" Delphi character intercept function leftstr/midstr/rightstr and copy usage