public Service[] GetDependentServices(Service service)
{
var servicePtr = ADVANCED_API.OpenService(
_managerPtr, service.Name, SERVICE_ACCESS.SERVICE_ENUMERATE_DEPENDENTS);
if (servicePtr == IntPtr.Zero)
{
var error = Marshal.GetLastWin32Error();
throw new Win32Exception(error);
}
var enumerated = ADVANCED_API.EnumDependentServices(
servicePtr,
SERVICE_ACTIVE_STATE.SERVICE_STATE_ALL,
IntPtr.Zero, 0,
out var bytesNeeded,
out _);
if (enumerated)
{
return(Array.Empty <Service>());
}
else
{
var error = Marshal.GetLastWin32Error();
if (error != ERROR.ERROR_MORE_DATA)
{
throw new Win32Exception(error);
}
}
var memoryPtr = Marshal.AllocHGlobal(bytesNeeded);
try
{
enumerated = ADVANCED_API.EnumDependentServices(
servicePtr,
SERVICE_ACTIVE_STATE.SERVICE_STATE_ALL,
memoryPtr, bytesNeeded,
out bytesNeeded,
out var servicesReturned);
if (!enumerated)
{
var error = Marshal.GetLastWin32Error();
throw new Win32Exception(error);
}
var services = new Service[servicesReturned];
var statusSize = Marshal.SizeOf <ENUM_SERVICE_STATUS>();
for (int i = 0; i < servicesReturned; i++)
{
var statusPtr = memoryPtr + i * statusSize;
var status = Marshal.PtrToStructure <ENUM_SERVICE_STATUS>(statusPtr);
services[i] = new Service(status);
}
return(services);
}
finally
{
Marshal.FreeHGlobal(memoryPtr);
}
}
