StartService
The StartService
function starts the execution of a service.
BOOL StartService(
|
SC_HANDLE hService, |
// handle of
service |
|
DWORD dwNumServiceArgs, |
// number of
arguments |
|
LPCTSTR *lpServiceArgVectors |
// address of array
of argument string pointers |
|
); |
|
Parameters
hService
Identifies
the service. This handle is returned by the OpenService or CreateService function, and it must have
SERVICE_START access.
dwNumServiceArgs
Specifies the
number of argument strings in the lpServiceArgVectors array. If lpServiceArgVectors
is NULL, this parameter can be zero.
lpServiceArgVectors
Points to an
array of pointers that point to null-terminated argument strings passed to a
service. Driver services do not receive these arguments. If no arguments are
passed to the service being started, this parameter can be NULL. The service
accesses these arguments through its ServiceMain function. Note that in the
array of arguments passed to the ServiceMain function, the first
argument (argv[0]) is the name of the service by default, followed by the
arguments, if any, in the lpServiceArgVectors array.
Return Values
If the
function succeeds, the return value is nonzero.
If the
function fails, the return value is zero. To get extended error information,
call GetLastError.
Errors
The following
error codes can be set by the service control manager. Others can be set by the
registry functions that are called by the service control manager.
|
Value |
Meaning |
|
ERROR_ACCESS_DENIED |
The specified
handle was not opened with SERVICE_START access. |
|
ERROR_INVALID_HANDLE |
The
specified handle is invalid. |
|
ERROR_PATH_NOT_FOUND |
The service
binary file could not be found. |
|
ERROR_SERVICE_ALREADY_RUNNING |
An instance
of the service is already running. |
|
ERROR_SERVICE_DATABASE_LOCKED |
The
database is locked. |
|
ERROR_SERVICE_DEPENDENCY_DELETED |
The service
depends on a service that does not exist or has been marked for deletion. |
|
ERROR_SERVICE_DEPENDENCY_FAIL |
The service
depends on another service that has failed to start. |
|
ERROR_SERVICE_DISABLED |
The service
has been disabled. |
|
ERROR_SERVICE_LOGON_FAILED |
The service
could not be logged on. |
|
ERROR_SERVICE_MARKED_FOR_DELETE |
The service
has been marked for deletion. |
|
ERROR_SERVICE_NO_THREAD |
A thread
could not be created for the Win32 service. |
|
ERROR_SERVICE_REQUEST_TIMEOUT |
The service
did not respond to the start request in a timely fashion. |
Remarks
When a driver
service is started, the StartService function does not return until the
device driver has finished initializing.
When a
service is started, the service control manager spawns the service process, if
necessary. If the specified service shares a process with other services, the
required process may already exist. The StartService function does not
wait for the first status update from the new service (which may take a while).
Instead, it returns when the service control manager receives notification from
the service control dispatcher that the ServiceMain thread for this service was
created successfully.
The service
control manager sets the following default status values before returning from StartService:
Current state of the service is
set to SERVICE_START_PENDING.
Controls accepted is set to
none (zero).
The CheckPoint value is set to
zero.
The WaitHint time is set to 2
seconds.
The calling
process can determine if the new service has finished its initialization by
calling the QueryServiceStatus function periodically to query the
service s status.
A service
cannot call StartService during initialization. The reason is that the
Service Control Manager locks the service control database during
initialization, so a call to StartService will block. Once the service
reports to the Service Control Manager that it has successfully started, it can
call StartService.
See Also