procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
var
I: Integer;
begin
if ( key in ['0'..'9','.',#13,#8,#46]) then
begin
if (Key = #8) and (Key = '.' ) then
J := J - 1;
if Key = '.' then
begin
for I := 0 to Length(Edit1.Text ) - 1 do
begin
if Copy(Edit1.Text ,I , 1) ='.' then
J := J +1 ;
if J >= 2 then
Key := #0;
end;
if (Length(Edit1.Text) = 0) or (Length(Edit1.Text) = 6) then
Key := #0;
end else
Exit;
end else
Key := #0;
end;
var
Form1: TForm1;
J : Integer;
implementation
{$R *.DFM}
procedure TForm1.FormCreate(Sender: TObject);
begin
edit1.MaxLength :=7;
J :=0;
end;
以上程序写在edit1的keypress事件中
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
if not (key in ['0'..'9',#8,#46]) then
key:=#0
else if length(edit1.Text)>=7 then
key:=#0
end;