delphi - 如何从我的 Delphi 服务调用另一个应用程序？

Question

我已经使用 Delphi 提供了一项服务。每次我调用该服务中的另一个应用程序时，该应用程序都不会运行。怎么了？

顺便说一句，我使用过 shellexecute、shellopen 或使用 cmd 调用它。这些方法都不起作用。

这是我的代码:

    program roro_serv;

uses
  SvcMgr,
  Unit1 in 'Unit1.pas' {Service1: TService},
  ping in 'ping.pas';

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TService1, Service1);
  Application.Run;
end.

    unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, SvcMgr, Dialogs,
  ExtCtrls, DB, MemDS, DBAccess, MyAccess, Menus, forms, IniFiles,
  ComCtrls, wininet, Variants, shellapi,
  FileCtrl, ExtActns, StdCtrls, ShellCtrls;

type
  TService1 = class(TService)
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
    procedure ServiceExecute(Sender: TService);
    procedure ServiceStop(Sender: TService; var Stopped: Boolean);
    procedure ServiceStart(Sender: TService; var Started: Boolean);
  private
    { Private declarations }
  public
    function GetServiceController: TServiceController; override;
    { Public declarations }
    procedure run_procedure;
    procedure log(text_file, atext : string );
    procedure loginfo(text : string);
    function  CheckUrl(url: string): boolean;
    procedure execCMD(CommandLine, Work:  string);
    function  DoDownload(FromUrl, ToFile: String): boolean;
  end;

var
  Service1: TService1;
  iTime : integer;
  limit_time : integer = 2;
  myini : TiniFile;
  default_exe_path : string = '';
  default_log_path : string = '';
  appdir : String = '';

implementation

{$R *.DFM}

uses ping;

function TService1.CheckUrl(url: string): boolean;
var 
hSession, hfile, hRequest: hInternet;
dwindex,dwcodelen :dword; 
dwcode:array[1..20] of char; 
res : pchar; 
begin 
if pos('http://',lowercase(url))=0 then 
url := 'http://'+url; 
Result := false; 
hSession := InternetOpen('InetURL:/1.0', 
INTERNET_OPEN_TYPE_PRECONFIG,nil, nil, 0);
if assigned(hsession) then
begin 
hfile := InternetOpenUrl(
hsession, 
pchar(url), 
nil, 
0, 
INTERNET_FLAG_RELOAD, 
0); 
dwIndex := 0; 
dwCodeLen := 10; 
HttpQueryInfo(hfile, HTTP_QUERY_STATUS_CODE, 
@dwcode, dwcodeLen, dwIndex); 
res := pchar(@dwcode); 
result:= (res ='200') or (res ='302'); 
if assigned(hfile) then 
InternetCloseHandle(hfile); 
InternetCloseHandle(hsession); 
end;
end;

procedure ServiceController(CtrlCode: DWord); stdcall;
begin
  Service1.Controller(CtrlCode);
end;

function TService1.GetServiceController: TServiceController;
begin
  Result := ServiceController;
end;

procedure TService1.Timer1Timer(Sender: TObject);
begin
iTime:=iTime+1;
if iTime=15 then // (limit_time*60) then
  begin
      itime:=1;
      run_procedure;
  end;
// loginfo('Defaultlog : '+default_log_path+'; exe : '+default_exe_path);
end;

procedure TService1.ServiceExecute(Sender: TService);
begin
Timer1.Enabled := True;
while not Terminated do
ServiceThread.ProcessRequests(True);
Timer1.Enabled := False;
end;

procedure TService1.run_procedure;
var
i : integer;
sUrl, sLogFile, sAction, sAct_param : String;
begin
for i:=0 to 20 do
   begin
   sLogFile:=default_log_path+myini.ReadString('logs', 'log_file'+intTostr(i), '');
   if fileexists(slogfile) then
      begin
      loginfo(slogfile+' tersedia');
      sAction:=myini.ReadString('logs', 'action'+intTostr(i), '');
           if ((trim(sAction)<>'') and (fileexists(default_exe_path+sAction))) then
              begin
                   // this line is don't work in servcie
                   ShellExecute(Application.Handle, 'open', 'c:\Windows\notepad.exe', nil, nil, SW_SHOWNORMAL);
                   sAct_param:=myini.ReadString('logs', 'action_prm'+intTostr(i), '');
                   // this line is don't work in servcie
                   execCMD(sAction+' '+sAct_param, default_exe_path);
                   loginfo(sAction+' '+sAct_param+' defpath : '+default_exe_path);
                   // this loginfo works
              end;
      end else
      begin

      end;

   end;
end;

procedure TService1.log(text_file, atext: string);
var
logFile : TextFile;
begin
AssignFile(LogFile, text_file);
if FileExists(text_file) then
Append(LogFile) else rewrite(LogFile);
WriteLn(logFile, aText);
CloseFile(LogFile);
end;

procedure TService1.loginfo(text: string);
begin
log(ChangeFileExt(application.exename, '.log'), formatdateTime('dd-mm-yyyy hh:nn:ss ', now)+
text);
end;

procedure TService1.ServiceStop(Sender: TService; var Stopped: Boolean);
begin
myini.Free;
end;

procedure TService1.execCMD(CommandLine, Work: string);
var
SA: TSecurityAttributes;
SI: TStartupInfo;
PI: TProcessInformation;
StdOutPipeRead, StdOutPipeWrite: THandle;
WorkDir: string;
begin
with SA do begin
nLength := SizeOf(SA);
bInheritHandle := True;
lpSecurityDescriptor := nil;
end;
CreatePipe(StdOutPipeRead, StdOutPipeWrite, @SA, 0);
try
with SI do
begin
FillChar(SI, SizeOf(SI), 0);
cb := SizeOf(SI);
dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
wShowWindow := SW_HIDE;
hStdInput := GetStdHandle(STD_INPUT_HANDLE); // don't redirect stdin
hStdOutput := StdOutPipeWrite;
hStdError := StdOutPipeWrite;
end;
WorkDir := Work;
CreateProcess(nil, PChar('cmd.exe /C ' + CommandLine),
nil, nil, True, 0, nil,
PChar(WorkDir), SI, PI);
CloseHandle(StdOutPipeWrite);
finally
CloseHandle(StdOutPipeRead);
end;
end;

procedure TService1.ServiceStart(Sender: TService; var Started: Boolean);
begin
appdir:=ExtractFileDir(Application.ExeName);
myini:=TiniFile.Create(ExtractFileDir(application.ExeName)+'\setting.ini');
limit_time:=myini.ReadInteger('setting', 'limit_time', 0);
default_exe_path:=myini.ReadString('setting', 'default_exe_path','');
if trim(default_exe_path)='' then default_exe_path:=appdir+'\';

default_log_path:=myini.ReadString('setting', 'default_log_path','');
if trim(default_log_path)='' then default_log_path:=appdir+'\logs\';

end;

function TService1.DoDownload(FromUrl, ToFile: String): boolean;
begin
 {  with TDownloadURL.Create(self) do
   try
     URL:=FromUrl;
     FileName := ToFile;
     ExecuteTarget(nil) ;
   finally
     Free;
   end;    }
end;

end.

请参阅 run_procedure 代码行；

简单地说:如何从我的服务调用另一个应用程序？

Answer 1

ShellExecute/Ex() 和 CreateProcess() 在与调用进程相同的 session 中运行指定的文件/应用程序。服务始终在 session 0 中运行。

在 XP 及更早版本中，第一个登录的用户也在 session 0 中运行，因此服务可以运行交互式进程并使其可供该交互式用户查看，但前提是该服务被标记为交互式(TService.Interactive 属性为 true)。如果多个用户登录，他们会在 session 1+ 中运行，因此无法看到服务运行的交互进程。

Windows Vista 引入了一项名为 "Session 0 Isolation" 的新功能。交互式用户不再在 session 0 中运行，而是始终在 session 1+ 中运行，并且 session 0 根本不交互式(TService.Interactive 属性不再具有任何效果)。但是，为了帮助迁移旧服务，如果服务运行尝试在 session 0 上显示 GUI 的交互式进程，Windows 会提示当前登录的用户(如果有)切换到临时使 GUI 可见的单独桌面。从 Windows 7 开始，传统支持现已消失。

在 Windows 2000 以后的所有版本中，从服务运行交互式进程并使其可供交互式用户查看的正确方法是使用 CreateProcessAsUser()在指定用户的 session 和桌面中运行新进程。 MSDN、StackOverflow 和整个 Web 上都有大量详细示例，因此我不会在这里重复它们。