Mega Code Archive
Strtoint64 - convert an integer string into an int64 value sysutils unit
<![CDATA[
function StrToInt64 ( IntegerString : string ) : Int64;
Description
The StrToInt64 function converts an Integer string, IntegerString such as '123' into an Int64 return value.
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
Int64 A 64 bit sized integer - the largest in Delphi
IntToStr Convert an integer into a string
StrToInt Convert an integer string into an Integer 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 : Int64;
begin
A := 32;
B := StrToInt64('100'); // '100' string converted to 100 integer
C := StrToInt64(' -12'); // Leading blanks are ignored
D := StrToInt64('$1E'); // Hexadecimal values start with a '$'
E := StrToInt64('-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 : Int64;
begin
// We will catch conversion errors
try
A := StrToInt64('100 '); // Trailing blanks are not supported
except
on Exception : EConvertError do
ShowMessage(Exception.Message);
end;
try
A := StrToInt64('$FG'); // 'G' is an invalid hexadecimal digit
except
on Exception : EConvertError do
ShowMessage(Exception.Message);
end;
end;
Show full unit code
'100 ' is not a valid integer value
'$FG' is not a valid integer value
]]>