List all physical printers using WMI query in Inno Setup

问题

I'm trying to get the list of physical printer's name, that are connected to Windows, based on an answer from Query available RAM in Inno Setup.

But just get: "Send To OneNote 16".

Here is my query:

Query := 'SELECT Name FROM Win32_Printer';
Printer := WbemQuery(WbemServices, Query);
if not VarIsNull(Printer) then
begin
  Log(Format('Printers=%s', [Printer.Name]));
end;

回答1:

You have to iterate the result set:

var
  Query: string;
  WbemLocator, WbemServices, WbemObjectSet: Variant;
  Printer: Variant;
  I: Integer;
begin
  WbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  WbemServices := WbemLocator.ConnectServer('.', 'root\CIMV2');
  Query := 'SELECT Name FROM Win32_Printer';
  WbemObjectSet := WbemServices.ExecQuery(Query);
  if not VarIsNull(WbemObjectSet) and (WbemObjectSet.Count > 0) then
  begin
    for I := 0 to WbemObjectSet.Count - 1 do
    begin
      Printer := WbemObjectSet.ItemIndex(I);
      if not VarIsNull(Printer) then
      begin
        Log(Printer.Name);
      end;
    end;
  end;
end;

The code requires Unicode version of Inno Setup for a better Variant support.

---

Actually, you can see this code in the same question, where you took the WbemQuery from:
Is there a way to read the system's information in Inno Setup

Note how the Win32_NetworkAdapterConfiguration is iterated there.

来源：https://stackoverflow.com/questions/44167016/list-all-physical-printers-using-wmi-query-in-inno-setup