Parameters in VS .NET

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lpMachineName is NULL if the SCM is on the local system, but you can also access the SCM on networked machines lpDatabaseName is also normally NULL dwDesiredAccess is normally SC_MANAGER_ALL_ACCESS, but you can specify more limited access rights, as described in the on-line documentation
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Creating and Deleting a Service
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Call CreateService to register a service SC_HANDLE CreateService ( SC_HANDLE hSCManager, LPCTSTR lpServiceName, LPCTSTR lpDisplayName, DWORD dwDesiredAccess, DWORD dwServiceType, DWORD dwStartType, DWORD dwErrorControl, LPCTSTR lpBinaryPathName, LPCTSTR lpLoadOrderGroup, LPDWORD lpdwTagId, LPCTSTR lpDependencies, LPCTSTR lpServiceStartName, LPCTSTR lpPassword);
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New services are entered into the registry under: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
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hSCManager is the SC_HANDLE obtained from OpenSCManager lpServiceName is the name that you use in future references to the service and is one of the logical service names specified in the dispatch table in the StartServiceCtrlDispatcher call Notice that there is a separate CreateService call for each logical service lpDisplayName is the name that will show up as a registry key and in the "Services" administrative tool (accessed from the control panel under Administrative Tools) You will see this name entered immediately after a successful CreateService call dwDesiredAccess can be SERVICE_ALL_ACCESS or combinations of GENERIC_READ, GENERIC_WRITE, and GENERIC_EXECUTE See the on-line documentation for additional details dwServiceType has values as in Table 13-1 dwStartType specifies how the service is started SERVICE_DEMAND_START is used in our examples, but other values (SERVICE_BOOT_START and SERVICE_SYSTEM_START) allow device driver services to be started during bootup or at system start time, and SERVICE_AUTO_START specifies that a service is to be started at system start-up lpBinaryPathName gives the service's executable; the exe extension is not required Other parameters specify account name and password, groups for combining services, and dependencies when there are several interdependent services Service configuration parameters of an existing service can be changed with ChangeServiceConfig and, for NT5, ChangeServiceConfig2 The service is identified by its handle, and you can specify new values for most of the parameters For example, you can provide a new dwServiceType or dwStartType value, but not a new value for dwAccess There is also an OpenService function to obtain a handle to a named service Use DeleteService to remove a service from the registry and CloseServiceHandle to close SC_HANDLEs
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A service, once created, is not running Start the ServiceMain() function by specifying the handle obtained from CreateService along with the argc, argv command line parameters expected by the service's main function (that is, the function specified in the dispatch table) BOOL StartService (
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SC_HANDLE hService, DWORD argc, LPTSTR argv [])
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Controlling a Service
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Control a service by telling the SCM to invoke the service's control handler with the specified control BOOL ControlService ( SC_HANDLE hService, DWORD dwControlCode, LPSERVICE_STATUS lpServStat)
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dw ControlCode, if access permits, is one of the following: SERVICE_CONTROL_STOP SERVICE_CONTROL_PAUSE SERVICE_CONTROL_CONTINUE SERVICE_CONTROL_INTERROGATE SERVICE_CONTROL_SHUTDOWN or a user-specified value in the range 128255 These are the same values as those used with the dwControl flag in the ServerCtrlHandler function lpServStat points to a SERVICE_STATUS structure that receives the current status This is the same structure as that used by the SetServiceStatus function
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Querying Service Status
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Obtain a service's current status in a SERVICE_STATUS structure with the following: BOOL QueryServiceStatus ( SC_HANDLE hService, LPSERVICE_STATUS lpServiceStatus)
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Summary: Service Operation and Management
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Figure 13-1 shows the SCM and its relation to the services and to a service control program, such as the one in Program 13-3 in the next section In particular, a service must register with the SCM, and all commands to the service pass through the SCM
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Example: A Service Control Shell
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Services are frequently controlled from the Administrative Tools, where there is a "Services" icon Alternatively, you can control user-developed services using ServiceShell (Program 13-3), which was developed by modifying 6's JobShell (Program 6-3)
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Program 13-3 ServiceShell: A Service Control Program
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/* 13 */ /* ServiceShellc Windows service management shell program This program modifies 6's job management program, managing services rather than jobs */ /* Commands supported are: create -- create a service delete -- delete a service start -- start a service control -- control a service */ #include "EvryThngh" static SC_HANDLE hScm; static BOOL Debug; int _tmain (int argc, LPTSTR argv []) { BOOL Exit = FALSE; TCHAR Command [MAX_COMMAND_LINE + 10], *pc; DWORD i, LocArgc; /* Local argc */ TCHAR argstr [MAX_ARG] [MAX_COMMAND_LINE]; LPTSTR pArgs [MAX_ARG]; /* Prepare the local "argv" array as pointers to strings */ for (i = 0; i < MAX_ARG; i++) pArgs [i] = argstr [i]; /* Open the SC Control Manager on the local machine */ hScm = OpenSCManager (NULL, NULL, SC_MANAGER_ALL_ACCESS); /* Main command processing loop */ _tprintf (_T ("\nWindows Service Management")); while (!Exit) { _tprintf (_T ("\nSM$")); _fgetts (Command, MAX_COMMAND_LINE, stdin); Similar to JobShell if (_tcscmp (argstr [0], _T ("create")) == 0) { Create (LocArgc, pArgs, Command); } Similarly for all commands } CloseServiceHandle (hScm); return 0; } int Create (int argc, LPTSTR argv [], LPTSTR Command) { /* Create a new service as a "demand start" service: argv [1]: service Name
argv [2]: display Name argv [3]: binary executable */ SC_HANDLE hSc; TCHAR CurrentDir [MAX_PATH + 1], Executable [MAX_PATH + 1]; hSc = CreateService (hScm, argv [1], argv [2], SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS, SERVICE_DEMAND_START, SERVICE_ERROR_NORMAL, Executable, NULL, NULL, NULL, NULL, NULL); return 0; } /* Delete a service -- argv [1]: ServiceName to delete */ int Delete (int argc, LPTSTR argv [], LPTSTR Command) { SC_HANDLE hSc; hSc = OpenService (hScm, argv [1], DELETE); DeleteService (hSc); CloseServiceHandle (hSc); return 0; } /* Start a named service -- argv [1]: service name to start */ int Start (int argc, LPTSTR argv [], LPTSTR Command) { SC_HANDLE hSc; TCHAR WorkingDir [MAX_PATH + 1]; LPTSTR pWorkingDir = WorkingDir; LPTSTR argvStart [] = {argv [1], WorkingDir}; GetCurrentDirectory (MAX_PATH + 1, WorkingDir); hSc = OpenService(hScm, argv [1], SERVICE_ALL_ACCESS); /* Start the service with one arg, the working directory */ /* Note: The service name agrees, by default, with the name */ /* associated with the handle, hSc, by OpenService */ /* But, the ServiceMain function does not verify this */ StartService (hSc, 2, argvStart); CloseServiceHandle (hSc); return 0; } /* Control a named service argv [1]: service name to control argv [2]: Control command: stop, pause, resume, interrogate */ static LPCTSTR Commands [] = {"stop," "pause," "resume," "interrogate," "user"}; static DWORD Controls [] = { SERVICE_CONTROL_STOP, SERVICE_CONTROL_PAUSE, SERVICE_CONTROL_CONTINUE, SERVICE_CONTROL_INTERROGATE, 128}; int Control (int argc, LPTSTR argv [], LPTSTR Command) { SC_HANDLE hSc; SERVICE_STATUS ServiceStatus; DWORD dwControl, i; BOOL Found = FALSE; for (i= 0; i < sizeof (Controls)/sizeof (DWORD) && !Found; i++) Found = (_tcscmp (Commands [i], argv [2]) == 0); if (!Found) {
_tprintf (_T ("\nIllegal Control Command %s"), argv [1]); return 1; } dwControl = Controls [i - 1]; hSc = OpenService(hScm, argv [1], SERVICE_INTERROGATE | SERVICE_PAUSE_CONTINUE | SERVICE_STOP | SERVICE_USER_DEFINED_CONTROL | SERVICE_QUERY_STATUS); ControlService (hSc, dwControl, &ServiceStatus); if (dwControl == SERVICE_CONTROL_INTERROGATE) { QueryServiceStatus (hSc, &ServiceStatus); printf (_T ("Status from QueryServiceStatus\n")); printf (_T ("Service Status\n")); Print all other status information } if (hSc != NULL) CloseServiceHandle (hSc); return 0; }