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ssdjgru1

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Test if some program is installed...

Does anybody know how to test if some program has been installed on computer. Can this be done in any other way then teseting the fileexistence?
(I would like to test if Powerpoint viewer has been installed)
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nestorua

HI,
Read the Registry.
Sincerely,
Nestorua.
Hi,

Try this code:


uses
  Registry;
   
procedure TForm1.Button1Click(Sender: TObject);
const
  UNINST_PATH = 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall';
var
  Reg: TRegistry;
  SubKeys: TStringList;
  ListItem: TlistItem;
  i: integer;
  sDisplayName, sUninstallString: string;
begin
{
  ListView1.ViewStyle := vsReport;
  ListView1.Columns.add;
  ListView1.Columns.add;
  ListView1.Columns[0].caption := 'DisplayName';
  ListView1.Columns[1].caption := 'UninstallString';
  ListView1.Columns[0].Width := 300;
  ListView1.Columns[1].Width := 300;
}
  Reg := TRegistry.Create;
  with Reg do
    try
      with ListView1.Items do
        try
          BeginUpdate;
          Clear;
          RootKey := HKEY_LOCAL_MACHINE;
          if OpenKeyReadOnly(UNINST_PATH) then
          begin
            SubKeys := TStringList.Create;
            try
              GetKeyNames(SubKeys);
              CloseKey;
              for i := 0 to subKeys.Count - 1 do
                if OpenKeyReadOnly(Format('%s\%s', [UNINST_PATH, SubKeys[i]])) then
                  try
                    sDisplayName     := ReadString('DisplayName');
                    sUninstallString := ReadString('UninstallString');
                    if sDisplayName <> '' then
                    begin
                      ListItem         := Add;
                      ListItem.Caption := sDisplayName;
                      ListItem.subitems.Add(sUninstallString);
                    end;
                  finally
                    CloseKey;
                  end;
            finally
              SubKeys.Free;
            end;
          end;
        finally
          ListView1.AlphaSort;
          EndUpdate;
        end;
    finally
      CloseKey;
      Free;
    end;
end;

HTH

tas

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