| Description |
The StrToIntDef function converts an Integer string, IntegerString such as '123' into an Integer value, with a Default if the conversion fails.
It supports +ve and -ve numbers, and hexadecimal numbers, as prefixed by $ or 0x.
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| Notes |
No conversion errors are generated - bad conversions simply result in the Default being returned.
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| Related commands |
| Integer |
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The basic Integer type |
| IntToStr |
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Convert an integer into a string |
| StrToInt |
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Convert an integer string into an Integer value |
| StrToInt64 |
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Convert an integer string into an Int64 value |
| StrToInt64Def |
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Convert a string into an Int64 value with default |
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| Example code : Converting decimal and hexadecimal numbers |
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
unit Unit1;
interface
uses
SysUtils, // Unit containing the StrToIntDef command
Forms, Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm} // Include form definitions
procedure TForm1.FormCreate(Sender: TObject);
var
A, B, C, D, E, F : Integer;
begin
A := 32;
B := StrToIntDef('100', 0); // '100' string converted to 100 integer
C := StrToIntDef(' -12', 0); // Leading blanks are ignored
D := StrToIntDef('$1E', 0); // Hexadecimal values start with a '$'
E := StrToIntDef('-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;
end.
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| Hide full unit code |
A : 32
B : 100
C : -12
D : 30
E : -30
F : 120
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| Example code : Catching string to integer conversion errors |
var
A : Integer;
begin
// No need to catch conversion errors
A := StrToIntDef('100 ', 55); // Trailing blanks are not supported
ShowMessage('Value = '+IntToStr(A));
A := StrToIntDef('$FG' , 66); // 'G' is an invalid hexadecimal digit
ShowMessage('Value = '+IntToStr(A));
end;
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| Show full unit code |
Value = 55
Value = 66
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