function IsNumeric(srcStr:string;):boolean; var i:integer; begin result:=true; for i:=1 to length(srcStr) do if not (ord(srcStr[i]) in [$30..$39] ) then begin result:=false; break; end;end;
自己编写这个函数: function IsNumber(const str: string): boolean; begin Result := true; try StrToInt(str); except Result := false; end; end;
procedure TForm1.Button1Click(Sender: TObject); function StrIsNumber(Str: String): Boolean; const Number = ['0'..'9']; sign = ['-', '+']; var i: integer; begin result := False; if not (str[1] in sign) and not (str[1] in Number) then exit; for i := 2 to length(Str) do begin if not (str[i] in Number) then exit; end; result := True; end; begin if StrIsNumber(edit1.Text) then begin Showmessage('Is Number'); end else Showmessage('Is not Number'); end;
var
i:integer;
begin
result:=true;
for i:=1 to length(srcStr) do
if not (ord(srcStr[i]) in [$30..$39] ) then
begin
result:=false;
break;
end;end;
function IsNumber(const str: string): boolean;
begin
Result := true;
try
StrToInt(str);
except
Result := false;
end;
end;
function StrIsNumber(Str: String): Boolean;
const
Number = ['0'..'9'];
sign = ['-', '+'];
var
i: integer;
begin
result := False;
if not (str[1] in sign) and not (str[1] in Number) then
exit; for i := 2 to length(Str) do
begin
if not (str[i] in Number) then
exit;
end; result := True;
end;
begin
if StrIsNumber(edit1.Text) then
begin
Showmessage('Is Number');
end
else
Showmessage('Is not Number');
end;