获取当前选定的Combobox值并将其用作变量

Question

我的问题是关于Delphi 7.我需要获取当前选择的ComboBox1值,以便在我的代码中将其用作浮点变量:

t:=t+ComboBox1. // Not sure what to write here...

谢谢!

Answer 1

不确定TryStrToFloat是否已经在Delphi 7中,但如果是,我会这样做.

procedure TForm1.ComboBox1Change(Sender: TObject);
var
  Value: Double;
begin
  if TryStrToFloat(ComboBox1.Text, Value) then
    T := T + Value
  else
    ShowMessage('You''ve entered wrong value ...');
end;

Answer 2

// ItemIndex is the index of the selected item
// If no item is selected, the value of ItemIndex is -1
if (ComboBox1.ItemIndex >= 0) then
begin
  t := t + StrToFloat(ComboBox1.Items[ComboBox1.ItemIndex]);
end;