Introduction
Apologies in advance about my English and the brief descriptions, as my native language is German. The
TService class wraps all the things around a NT-Service and allows to create a NT-Service with a few lines
of code.
TService
virtual void ServiceProc (void) = PURE;
This is the main service procedure. If you leave ServiceProc()
your service is stopped.
virtual const char* GetName (void) = PURE;
virtual const char* GetDisplayName (void) {return GetName();}
Simply return a string to identify the service by name. You can also overwrite the GetDisplayName()
procedure to install your service with a different display name.
bool Execute (void);
Run as Service. This should be the default call for your service from the main procedure.
bool ConsoleMode (void);
To check out a service you can run the service from a console window. The service runs in the logged on user account.
bool Start (void);
bool Stop (void);
bool Install (void);
bool Remove (void);
virtual bool Help (DWORD context = 0);
Control the service. Help() searches for a helpfile named "GetName().hlp"
bool Terminated (void;}
void Terminate (void;}
Your ServiceProc() must check Terminated() periodically to get a stop request. When
Terminated() returns true you should leave the ServiceProc() und cleanup your Service. Call
Terminate() to stop the Service from outside ServiceProc().
const char * LastError (void) const {return m_ServiceError;}
Returns the last error as string from the system.
void PrintLastError (const char *Caption = NULL);
Writes the last error to the standard error device if any.
bool SetConfigValue (char* key,BYTE *value,DWORD nvalue,cfValType type = cfString);
bool GetConfigValue (char* key,BYTE *buf,DWORD *nbuff,cfValType *ypet);
enum cfValType {
cfBinary = REG_BINARY,
cfDword = REG_DWORD,
cfString = REG_S
};
Set and get Registry Values like RegSetValue() and RegQueryValue(). The values are located under : "HKLM\SYSTEM\CurrentControlSet\Services\%ServiceName%\ServiceConfig\".
void LogEvent (char* event,evLogType type = evInfo,WORD category = 0);
enum evLogType {
evError = EVENTLOG_ERROR_TYPE,
evWarning = EVENTLOG_WARNING_TYPE,
evInfo = EVENTLOG_INFORMATION_TYPE
};
Write to the SystemEventLog.
virtual bool Init (void) {return true;}
Is be called before ServiceProc(), you can setup your service here.
If Init() returns false the service will stop.
virtual void Cleanup (void) {return;}
The service is stopped, cleanup resources from Init().
virtual void LogoffEvent (void) {return;}
A user has logged off. If you would check that a user is logged in search in
ServiceProc() for a window named "Shell_TrayWnd".
virtual void ShutdownEvent (void) {Terminate();}
The Machine is shutting down, terminate the service.
Sample
Here is a short quick and dirty sample how to create a service.
To control the service run the executable from the console with the parameters :
| /install |
to install the service |
| /remove |
to remove the service from the system |
| /start |
to start the service |
| /quit |
to stop the service |
| /test |
to test the service from a console window
|
#include "cService.hpp" // cService.h AND cService.cpp
class cMyService : private TService {
public:
cMyService (char *arg);
private:
const char* GetName (void){return "MyService";}
void ServiceProc (void);
};
cMyService::cMyService (char *arg) {
if (arg != NULL) {
unsigned short a = *((unsigned short*) arg);
if (a == *((unsigned short*) "/i")) Install();
else if (a == *((unsigned short*) "/r")) Remove();
else if (a == *((unsigned short*) "/s")) Start();
else if (a == *((unsigned short*) "/q")) Stop();
else if (a == *((unsigned short*) "/t")) ConsoleMode();
}
else Execute();
}
void cMyService::ServiceProc (void) {
while (! Terminated()) {
Beep (400,100);
Sleep (5000);
}
}
void main (int argc,char *argv[]) {
delete new cMyService(argv[1]);
}
History
- July 7, 2004 - First release.
