Mega Code Archive
Strtoint64def - convert a string into an int64 value with default sysutils unit
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function StrToInt64Def ( const IntegerString : string; Default : Integer ) : Int64;
Description
The StrToInt64Def function converts an Integer string, IntegerString such as '123' into an Int64 value, with a Default if the conversion fails.
It supports +ve and -ve numbers, and hexadecimal numbers, as prefixed by $ or 0x.
Notes
No conversion errors are generated - bad conversions simply result in the Default being returned.
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
StrToInt64 Convert an integer string into an Int64 value
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 := StrToInt64Def('100', 0); // '100' string converted to 100 integer
C := StrToInt64Def(' -12', 0); // Leading blanks are ignored
D := StrToInt64Def('$1E', 0); // Hexadecimal values start with a '$'
E := StrToInt64Def('-0x1E', 0); // ... 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
// No need to catch conversion errors
A := StrToInt64Def('100 ', 55); // Trailing blanks are not supported
ShowMessage('Value = '+IntToStr(A));
A := StrToInt64Def('$FG' , 66); // 'G' is an invalid hexadecimal digit
ShowMessage('Value = '+IntToStr(A));
end;
Show full unit code
Value = 55
Value = 66
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