Create Process and Wait for Exit

posted 23 Sep 2010, 18:39 by Delphi Basics
This source code details how to create a process and be notified when it finishes. 

function RunProcess(FileName: string; ShowCmd: DWORD; wait: Boolean; ProcID:
  PDWORD): Longword;
var
  StartupInfo: TStartupInfo;
  ProcessInfo: TProcessInformation;
begin
  FillChar(StartupInfo, SizeOf(StartupInfo), #0);
  StartupInfo.cb := SizeOf(StartupInfo);
  StartupInfo.dwFlags := STARTF_USESHOWWINDOW or STARTF_FORCEONFEEDBACK;
  StartupInfo.wShowWindow := ShowCmd;
  if not CreateProcess(nil,
    @Filename[1],
    nil,
    nil,
    False,
    CREATE_NEW_CONSOLE or
    NORMAL_PRIORITY_CLASS,
    nil,
    nil,
    StartupInfo,
    ProcessInfo)
    then
    Result := WAIT_FAILED
  else
  begin
    if wait = FALSE then
    begin
      if ProcID <> nil then
        ProcID^ := ProcessInfo.dwProcessId;
      result := WAIT_FAILED;
      exit;
    end;
    WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
    GetExitCodeProcess(ProcessInfo.hProcess, Result);
  end;
  if ProcessInfo.hProcess <> 0 then
    CloseHandle(ProcessInfo.hProcess);
  if ProcessInfo.hThread <> 0 then
    CloseHandle(ProcessInfo.hThread);
end;

Usage:
var
  ProcID: Cardinal;
begin
  ProcID := 0;
  RunProcess('notepad.exe', SW_SHOW, TRUE, @ProcID);
  ShowMessage(IntToStr(ProcID));
end;
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