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OpenService info  Overview  Group

The OpenService function opens a handle to an existing service.

SC_HANDLE OpenService(

    SC_HANDLE hSCManager,

// handle to service control manager database

    LPCTSTR lpServiceName,

// pointer to name of service to start

    DWORD dwDesiredAccess 

// type of access to service

   );

Parameters

hSCManager
Identifies the service control manager database. The OpenSCManager function returns this handle.
lpServiceName
Points to a null-terminated string that names the service to open. The maximum string length is 256 characters. The service control manager database preserves the case of the characters, but service name comparisons are always case insensitive. Forward-slash (/) and backslash (\) are invalid service name characters.
dwDesiredAccess
Specifies the access to the service. Before granting the requested access, the system checks the access token of the calling process against the discretionary access-control list of the security descriptor associated with the service object.

The STANDARD_RIGHTS_REQUIRED constant enables the following service object access types:

Standard rights

Description

DELETE

Enables calling of the DeleteService function to delete the service.

READ_CONTROL

Enables calling of the QueryServiceObjectSecurity function to query the security descriptor of the service object.

WRITE_DAC|WRITE_OWNER

Enables calling of the SetServiceObjectSecurity function to modify the security descriptor of the service object.

You can specify any or all of the following service object access types:

Access

Description

SERVICE_ALL_ACCESS

Includes STANDARD_RIGHTS_REQUIRED in addition to all of the access types listed in this table.

SERVICE_CHANGE_CONFIG

Enables calling of the ChangeServiceConfig function to change the service configuration.

SERVICE_ENUMERATE_DEPENDENTS

Enables calling of the EnumDependentServices function to enumerate all the services dependent on the service.

SERVICE_INTERROGATE

Enables calling of the ControlService function to ask the service to report its status immediately.

SERVICE_PAUSE_CONTINUE

Enables calling of the ControlService function to pause or continue the service.

SERVICE_QUERY_CONFIG

Enables calling of the QueryServiceConfig function to query the service configuration.

SERVICE_QUERY_STATUS

Enables calling of the QueryServiceStatus function to ask the service control manager about the status of the service.

SERVICE_START

Enables calling of the StartService function to start the service.

SERVICE_STOP

Enables calling of the ControlService function to stop the service.

SERVICE_USER_DEFINED_CONTROL

Enables calling of the ControlService function to specify a user-defined control code.

You can specify any of the following generic access types:

Generic access

Service access

GENERIC_READ

Combines the following access types: STANDARD_RIGHTS_READ, SERVICE_QUERY_CONFIG, SERVICE_QUERY_STATUS, and SERVICE_ENUMERATE_DEPENDENTS.

GENERIC_WRITE

Combines the following access types: STANDARD_RIGHTS_WRITE and SERVICE_CHANGE_CONFIG.

GENERIC_EXECUTE

Combines the following access types: STANDARD_RIGHTS_EXECUTE, SERVICE_START, SERVICE_STOP, SERVICE_PAUSE_CONTINUE, SERVICE_INTERROGATE, and SERVICE_USER_DEFINED_CONTROL.

Return Values

If the function succeeds, the return value is a handle to the service.

If the function fails, the return value is NULL. 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.

Error code

Meaning

ERROR_ACCESS_DENIED

The specified service control manager database handle does not have access to the service.

ERROR_INVALID_HANDLE

The specified handle is invalid.

ERROR_INVALID_NAME

The specified service name is invalid.

ERROR_SERVICE_DOES_NOT_EXIST

The specified service does not exist.

Remarks

The returned handle is only valid for the process that called OpenService. It can be closed by calling the CloseServiceHandle function.

See Also

ChangeServiceConfig, ControlService, CreateService, DeleteService, EnumDependentServices, OpenSCManager, QueryServiceConfig, QueryServiceObjectSecurity, QueryServiceStatus, SetServiceObjectSecurity, StartService 


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