The QueryServiceConfig function retrieves the configuration parameters of the specified service.
BOOL QueryServiceConfig(
| SC_HANDLE hService, | // handle of service |
| LPQUERY_SERVICE_CONFIG lpServiceConfig, | // address of service config. structure |
| DWORD cbBufSize, | // size of service configuration buffer |
| LPDWORD pcbBytesNeeded | // address of variable for bytes needed |
| ); |
Parameters
hService
Identifies the service. This handle is returned by the OpenService or CreateService function, and it must have SERVICE_QUERY_CONFIG access.
lpServiceConfig
Points to a QUERY_SERVICE_CONFIG structure in which the service configuration information is returned.
cbBufSize
Specifies the size, in bytes, of the buffer pointed to by the lpServiceConfig parameter.
pcbBytesNeeded
Points to a variable that receives the number of bytes needed to return all the configuration information.
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_QUERY_CONFIG access. |
| ERROR_INSUFFICIENT_BUFFER | There is more service configuration information than would fit into the lpServiceConfig buffer. The number of bytes required to get all the information is returned in the pcbBytesNeeded parameter. Nothing is written to the lpServiceConfig buffer. |
| ERROR_INVALID_HANDLE | The specified handle is invalid. |
Remarks
The QueryServiceConfig function returns the service configuration information kept in the registry for a particular service. This configuration information was first set via the CreateService function, and may have been updated via the ChangeServiceConfig function. If the service was running when the configuration information was last changed, the information returned with the QueryServiceConfig will not reflect the true configuration of the service that is running. Instead, it will reflect the configuration of the service when it is run next. Upon stopping the service, the service control manager database will be updated with the configuration that is stored in the registry. The DisplayName key is an exception to this. When the DisplayName key is changed, it takes effect immediately regardless of whether the service is running.
The lpServiceConfig buffer must be large enough to hold the strings pointed to by the members of the QUERY_SERVICE_CONFIG structure.
See Also
ChangeServiceConfig, CreateService, OpenService, QUERY_SERVICE_CONFIG, QueryServiceObjectSecurity, QueryServiceStatus