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Thursday, June 7, 2012

Start a program and wait for its termination


// With CreateProcess:
//*****************************************************

{1}

function WinExecAndWait32(FileName: string; Visibility: Integer): Longword;
var { by Pat Ritchey }
  zAppName: array[0..512] of Char;
  zCurDir: array[0..255] of Char;
  WorkDir: string;
  StartupInfo: TStartupInfo;
  ProcessInfo: TProcessInformation;
begin
  StrPCopy(zAppName, FileName);
  GetDir(0, WorkDir);
  StrPCopy(zCurDir, WorkDir);
  FillChar(StartupInfo, SizeOf(StartupInfo), #0);
  StartupInfo.cb          := SizeOf(StartupInfo);
  StartupInfo.dwFlags     := STARTF_USESHOWWINDOW;
  StartupInfo.wShowWindow := Visibility;
  if not CreateProcess(nil,
    zAppName, // pointer to command line string
    nil, // pointer to process security attributes
    nil, // pointer to thread security attributes
    False, // handle inheritance flag
    CREATE_NEW_CONSOLE or // creation flags
    NORMAL_PRIORITY_CLASS,
    nil, //pointer to new environment block
    nil, // pointer to current directory name
    StartupInfo, // pointer to STARTUPINFO
    ProcessInfo) // pointer to PROCESS_INF
    then Result := WAIT_FAILED
  else
  begin
    WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
    GetExitCodeProcess(ProcessInfo.hProcess, Result);
    CloseHandle(ProcessInfo.hProcess);
    CloseHandle(ProcessInfo.hThread);
  end;
end; { WinExecAndWait32 }

procedure TForm1.Button1Click(Sender: TObject);
begin
  WinExecAndWait32('notepad.exe', False, True);
end;


{*******************************}


{2} "Anti-Freezing":

function ExecAndWait(const FileName: string; const CmdShow: Integer): Longword;
var { by Pat Ritchey }
  zAppName: array[0..512] of Char;
  zCurDir: array[0..255] of Char;
  WorkDir: string;
  StartupInfo: TStartupInfo;
  ProcessInfo: TProcessInformation;
  AppIsRunning: DWORD;
begin
  StrPCopy(zAppName, FileName);
  GetDir(0, WorkDir);
  StrPCopy(zCurDir, WorkDir);
  FillChar(StartupInfo, SizeOf(StartupInfo), #0);
  StartupInfo.cb          := SizeOf(StartupInfo);
  StartupInfo.dwFlags     := STARTF_USESHOWWINDOW;
  StartupInfo.wShowWindow := CmdShow;
  if not CreateProcess(nil,
    zAppName, // pointer to command line string
    nil, // pointer to process security attributes
    nil, // pointer to thread security attributes
    False, // handle inheritance flag
    CREATE_NEW_CONSOLE or // creation flags
    NORMAL_PRIORITY_CLASS,
    nil, //pointer to new environment block
    nil, // pointer to current directory name
    StartupInfo, // pointer to STARTUPINFO
    ProcessInfo) // pointer to PROCESS_INF
    then Result := WAIT_FAILED
  else
  begin
    while WaitForSingleObject(ProcessInfo.hProcess, 0) = WAIT_TIMEOUT do
    begin
      Application.ProcessMessages;
      Sleep(50);
    end;
    {
    // or:
    repeat
      AppIsRunning := WaitForSingleObject(ProcessInfo.hProcess, 100);
      Application.ProcessMessages;
      Sleep(50);
    until (AppIsRunning <> WAIT_TIMEOUT);
    }


    WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
    GetExitCodeProcess(ProcessInfo.hProcess, Result);
    CloseHandle(ProcessInfo.hProcess);
    CloseHandle(ProcessInfo.hThread);
  end;
end; { WinExecAndWait32 }


procedure TForm1.Button1Click(Sender: TObject);
begin
  ExecAndWait('C:\Programme\WinZip\WINZIP32.EXE', SW_SHOW);
end;

{3}

{--WinExecAndWait32V2 ------------------------------------------------}
{: Executes a program and waits for it to terminate
@Param FileName contains executable + any parameters
@Param Visibility is one of the ShowWindow options, e.g. SW_SHOWNORMAL
@Returns -1 in case of error, otherwise the programs exit code
@Desc In case of error SysErrorMessage( GetlastError ) will return an
  error message. The routine will process paint messages and messages
  send from other threads while it waits.
}{ Created 27.10.2000 by P. Below
-----------------------------------------------------------------------}


function WinExecAndWait32V2(FileName: string; Visibility: Integer): DWORD;
  procedure WaitFor(processHandle: THandle);
  var
    Msg: TMsg;
    ret: DWORD;
  begin
    repeat
      ret := MsgWaitForMultipleObjects(1, { 1 handle to wait on }
        processHandle, { the handle }
        False, { wake on any event }
        INFINITE, { wait without timeout }
        QS_PAINT or { wake on paint messages }
        QS_SENDMESSAGE { or messages from other threads }
        );
      if ret = WAIT_FAILED then Exit; { can do little here }
      if ret = (WAIT_OBJECT_0 + 1) then
      begin
          { Woke on a message, process paint messages only. Calling
            PeekMessage gets messages send from other threads processed. }
        while PeekMessage(Msg, 0, WM_PAINT, WM_PAINT, PM_REMOVE) do
          DispatchMessage(Msg);
      end;
    until ret = WAIT_OBJECT_0;
  end; { Waitfor }
var { V1 by Pat Ritchey, V2 by P.Below }
  zAppName: array[0..512] of char;
  StartupInfo: TStartupInfo;
  ProcessInfo: TProcessInformation;
begin { WinExecAndWait32V2 }
  StrPCopy(zAppName, FileName);
  FillChar(StartupInfo, SizeOf(StartupInfo), #0);
  StartupInfo.cb          := SizeOf(StartupInfo);
  StartupInfo.dwFlags     := STARTF_USESHOWWINDOW;
  StartupInfo.wShowWindow := Visibility;
  if not CreateProcess(nil,
    zAppName, { pointer to command line string }
    nil, { pointer to process security attributes }
    nil, { pointer to thread security attributes }
    False, { handle inheritance flag }
    CREATE_NEW_CONSOLE or { creation flags }
    NORMAL_PRIORITY_CLASS,
    nil, { pointer to new environment block }
    nil, { pointer to current directory name }
    StartupInfo, { pointer to STARTUPINFO }
    ProcessInfo) { pointer to PROCESS_INF } then
    Result := DWORD(-1) { failed, GetLastError has error code }
  else
  begin
    Waitfor(ProcessInfo.hProcess);
    GetExitCodeProcess(ProcessInfo.hProcess, Result);
    CloseHandle(ProcessInfo.hProcess);
    CloseHandle(ProcessInfo.hThread);
  end; { Else }
end; { WinExecAndWait32V2 }

procedure TForm1.Button1Click(Sender: TObject);
begin
  WinExecAndWait32V2('notepad.exe', SW_SHOWNORMAL);
end;


// With ShellExecuteEx:
//*****************************************************

{1}

uses
  ShellApi;


procedure ShellExecute_AndWait(FileName: string; Params: string);
var
  exInfo: TShellExecuteInfo;
  Ph: DWORD;
begin
  FillChar(exInfo, SizeOf(exInfo), 0);
  with exInfo do
  begin
    cbSize := SizeOf(exInfo);
    fMask := SEE_MASK_NOCLOSEPROCESS or SEE_MASK_FLAG_DDEWAIT;
    Wnd := GetActiveWindow();
    ExInfo.lpVerb := 'open';
    ExInfo.lpParameters := PChar(Params);
    lpFile := PChar(FileName);
    nShow := SW_SHOWNORMAL;
  end;
  if ShellExecuteEx(@exInfo) then
    Ph := exInfo.HProcess
  else
  begin
    ShowMessage(SysErrorMessage(GetLastError));
    Exit;
  end;
  while WaitForSingleObject(ExInfo.hProcess, 50) <> WAIT_OBJECT_0 do
    Application.ProcessMessages;
  CloseHandle(Ph);
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  ShellExecute_AndWait('FileName', 'Parameter');
end;

{*******************************}

{2}

function ShellExecute_AndWait(Operation, FileName, Parameter, Directory: string;
  Show: Word; bWait: Boolean): Longint;
var
  bOK: Boolean;
  Info: TShellExecuteInfo;
{
  ****** Parameters ******
  Operation:

  edit  Launches an editor and opens the document for editing.
  explore Explores the folder specified by lpFile.
  find Initiates a search starting from the specified directory.
  open Opens the file, folder specified by the lpFile parameter.
  print Prints the document file specified by lpFile.
  properties Displays the file or folder's properties.

  FileName:

  Specifies the name of the file or object on which
  ShellExecuteEx will perform the action specified by the lpVerb parameter.

  Parameter:

  String that contains the application parameters.
  The parameters must be separated by spaces.

  Directory:

  specifies the name of the working directory.
  If this member is not specified, the current directory is used as the working directory.

  Show:

  Flags that specify how an application is to be shown when it is opened.
  It can be one of the SW_ values

  bWait:

  If true, the function waits for the process to terminate
}
begin
  FillChar(Info, SizeOf(Info), Chr(0));
  Info.cbSize := SizeOf(Info);
  Info.fMask := SEE_MASK_NOCLOSEPROCESS;
  Info.lpVerb := PChar(Operation);
  Info.lpFile := PChar(FileName);
  Info.lpParameters := PChar(Parameter);
  Info.lpDirectory := PChar(Directory);
  Info.nShow := Show;
  bOK := Boolean(ShellExecuteEx(@Info));
  if bOK then
  begin
    if bWait then
    begin
      while
        WaitForSingleObject(Info.hProcess, 100) = WAIT_TIMEOUT
        do Application.ProcessMessages;
      bOK := GetExitCodeProcess(Info.hProcess, DWORD(Result));
    end
    else
      Result := 0;
  end;
  if not bOK then Result := -1;
end;

Source



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