我用Delphi做过服务.每次我在该服务中调用另一个应用程序时,应用程序都不会运行.哪里不对？
顺便说一下,我使用了shellexecute,shellopen或用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,0);
if assigned(hsession) then
begin
hfile := InternetOpenUrl(
hsession,pchar(url),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',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),True,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：如何从我的服务中调用另一个应用程序？
解决方法
ShellExecute / Ex()和CreateProcess()在与调用进程相同的会话中运行指定的文件/ app.服务始终在会话0中运行.
在XP及更早版本中,第一个登录用户也在会话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属性为真正).如果多个用户登录,则它们在会话1中运行,因此无法查看服务运行的交互式进程.
Windows Vista引入了一个名为“Session 0 Isolation”的新功能.交互式用户根本不再在会话0中运行,它们总是在会话1中运行,而会话0根本不是交互式的(TService.Interactive属性不再有任何影响).但是,为了帮助迁移旧服务,如果服务运行尝试在会话0上显示GUI的交互式进程,Windows会提示当前登录用户(如果有)切换到临时使GUI可见的单独桌面.在Windows 7以后,这种传统支持现在已经消失.
在从2000年开始的Windows上的所有版本中,从服务运行交互式进程并让交互式用户可以查看的正确方法是使用CreateProcessAsUser()在指定用户的会话和桌面中运行新进程.在MSDN,StackOverflow和整个Web上都有很多详细的例子,所以我不打算在这里重申它们.