function StrToInt ( IntegerString : string ) : Integer;
Description
The StrToInt function converts an Integer string, IntegerString such as '123' into an Integer.
It supports +ve and -ve numbers, and hexadecimal numbers, as prefixed by $ or 0x.
Notes
The EConvertError exception is thrown if there are errors in IntegerString, such as trailing blanks, decimal points, invalid decimal or hexadecimal characters.
Related commands
Integer The basic Integer type
IntToStr Convert an integer into a string
StrToInt64 Convert an integer string into an Int64 value
StrToInt64Def Convert a string into an Int64 value with default
StrToIntDef Convert a string into an Integer value with default
Example code : Converting decimal and hexadecimal numbers
var
A, B, C, D, E, F : Integer;
begin
A := 32;
B := StrToInt('100'); // '100' string converted to 100 integer
C := StrToInt(' -12'); // Leading blanks are ignored
D := StrToInt('$1E'); // Hexadecimal values start with a '$'
E := StrToInt('-0x1E'); // ... or with a '0x'
F := A + B + C + D + E; // Lets add up all these integers
ShowMessage('A : '+IntToStr(A));
ShowMessage('B : '+IntToStr(B));
ShowMessage('C : '+IntToStr(C));
ShowMessage('D : '+IntToStr(D));
ShowMessage('E : '+IntToStr(E));
ShowMessage('F : '+IntToStr(F));
end;
Show full unit code
A : 32
B : 100
C : -12
D : 30
E : -30
F : 120
Example code : Catching string to integer conversion errors
var
A : Integer;
begin
// We will catch conversion errors
try
A := StrToInt('100 '); // Trailing blanks are not supported
except
on Exception : EConvertError do
ShowMessage(Exception.Message);
end;
try
A := StrToInt('$FG'); // 'G' is an invalid hexadecimal digit
except
on Exception : EConvertError do
ShowMessage(Exception.Message);
end;
end;
Show full unit code
'100 ' is not a valid integer value
'$FG' is not a valid integer value