带CheckBox全选功能

vari:Integer;begin for I := 0 to lstqq.Items.Count - 1 do   begin     lstqq.Items[i].Checked:=True;   end;end;

删除所选:

vari:Integer;begin for i :=lstqq.items.Count - 1 downto 0 do begin   if lstqq.Items[i].Checked then lstqq.Items.Delete(i); end;end;

Listview导出数据到文本:

var  i, j: integer;  s: string;  temp,temp1: string;begin  temp := '';  for I := 0 to Lstqq.Items.Count - 1 do  begin    for j := 0 to lstqq.Items[i].SubItems.Count - 1 do    begin    temp1:=lstqq.Items.Item[i].Caption;    temp:=lstqq.Items.Item[i].SubItems.Strings[j];    s:=temp1+','+temp;    AppendTxt(s,'log.txt')    end;  end;end;procedure TFrmMain.AppendTxt(Str, FileName: String);var  f:TextFile;begin  if not FileExists(FileName) then FileCreate('log.txt');  AssignFile(f, FileName); //把一个外部文件和一个变量关联起来。  Append(f);     //追加方式打开一个文件  Writeln(f, Str); //把字符串写入到变量F  Closefile(f);   //关闭文件end;