Inno Setup Pascal Script to search for running process

Question

I am currently trying to do a validation at the uninstall moment. In a Pascal script function, in Inno Setup, I want to search for a specific processes, with a wild card if possible. Then, loop through all find results, get the Image Name and Image Path Name, in order to check if the program that is about to be uninstalled is the same as the one running.

Is there a way to do that?

Answer 1

This is an exemplary task for WMI and its WQL language. Getting list of running processes through WMI is even more reliable than Windows API. The below example shows how to query the Win32_Process class with the LIKE operator:

[Setup]
AppName=My Program
AppVersion=1.5
DefaultDirName={pf}\My Program
DefaultGroupName=My Program

[Code]
type
  TProcessEntry = record
    PID: DWORD;
    Name: string;
    Description: string;
    ExecutablePath: string;
  end;
  TProcessEntryList = array of TProcessEntry;

function GetProcessList(const Filter: string;
  out List: TProcessEntryList): Integer;
var
  I: Integer;
  WQLQuery: string;
  WbemLocator: Variant;
  WbemServices: Variant;
  WbemObject: Variant;
  WbemObjectSet: Variant;
begin
  Result := 0;

  WbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  WbemServices := WbemLocator.ConnectServer('localhost', 'root\CIMV2');

  WQLQuery :=
    'SELECT ' +
    'ProcessId, ' + 
    'Name, ' + 
    'Description, ' + 
    'ExecutablePath ' +
    'FROM Win32_Process ' +
    'WHERE ' +
    'Name LIKE "%'+ Filter +'%"';

  WbemObjectSet := WbemServices.ExecQuery(WQLQuery);
  if not VarIsNull(WbemObjectSet) and (WbemObjectSet.Count > 0) then
  begin
    Result := WbemObjectSet.Count;
    SetArrayLength(List, WbemObjectSet.Count);
    for I := 0 to WbemObjectSet.Count - 1 do
    begin
      WbemObject := WbemObjectSet.ItemIndex(I);
      if not VarIsNull(WbemObject) then
      begin
        List[I].PID := WbemObject.ProcessId;
        List[I].Name := WbemObject.Name;
        List[I].Description := WbemObject.Description;
        List[I].ExecutablePath := WbemObject.ExecutablePath;
      end;
    end;
  end;
end;

procedure InitializeWizard;
var
  S: string;
  I: Integer;
  Filter: string;
  ProcessList: TProcessEntryList;
begin
  MsgBox('Now we try to list processes containing "sv" in their names...',
    mbInformation, MB_OK);

  Filter := 'sv';
  if GetProcessList(Filter, ProcessList) > 0 then
    for I := 0 to High(ProcessList) do
    begin
      S := Format(
        'PID: %d' + #13#10 +
        'Name: %s' + #13#10 +
        'Description: %s' + #13#10 +
        'ExecutablePath: %s', [
        ProcessList[I].PID,
        ProcessList[I].Name,
        ProcessList[I].Description,
        ProcessList[I].ExecutablePath]);
      MsgBox(S, mbInformation, MB_OK);
    end;
end;