public static IEnumerable<ENUM_SERVICE_STATUS_PROCESS> GetServices(
string machineName, string databaseName, AccessFlags accessFlags, // From OpenSCManager
ServiceEnumType infoLevel, ServiceType serviceType, ServiceStateRequest serviceStateRequest // From EnumServicesStatusEx
)
{
List<ENUM_SERVICE_STATUS_PROCESS> results = new List<ENUM_SERVICE_STATUS_PROCESS>();
IntPtr handle = OpenSCManager(machineName, databaseName, accessFlags);
if (handle == IntPtr.Zero)
{
return null;
}
IntPtr serviceStatusBuffer = IntPtr.Zero;
try
{
uint bytesNeeded = 0;
uint servicesReturned = 0;
uint resumeHandle = 0;
if (!EnumServicesStatusEx(handle, infoLevel, serviceType, serviceStateRequest, IntPtr.Zero, 0, out bytesNeeded, out servicesReturned, ref resumeHandle, null))
{
// allocate our memory to receive the data for all the services (including the names)
serviceStatusBuffer = Marshal.AllocHGlobal((int)bytesNeeded);
if (!EnumServicesStatusEx(handle, infoLevel, serviceType, serviceStateRequest, serviceStatusBuffer, bytesNeeded, out bytesNeeded, out servicesReturned, ref resumeHandle, null))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
ENUM_SERVICE_STATUS_PROCESS serviceStatus;
// check if 64 bit system which has different pack sizes
if (IntPtr.Size == 8)
{
long pointer = serviceStatusBuffer.ToInt64();
for (int i = 0; i < (int)servicesReturned; i++)
{
serviceStatus = (ENUM_SERVICE_STATUS_PROCESS)Marshal.PtrToStructure(new IntPtr(pointer), typeof(ENUM_SERVICE_STATUS_PROCESS));
results.Add(serviceStatus);
// incremement by sizeof(ENUM_SERVICE_STATUS_PROCESS) allow Packing of 8
pointer += ENUM_SERVICE_STATUS_PROCESS.SizePack8;
}
}
else
{
int pointer = serviceStatusBuffer.ToInt32();
for (int i = 0; i < (int)servicesReturned; i++)
{
serviceStatus = (ENUM_SERVICE_STATUS_PROCESS)Marshal.PtrToStructure(new IntPtr(pointer), typeof(ENUM_SERVICE_STATUS_PROCESS));
results.Add(serviceStatus);
// incremement by sizeof(ENUM_SERVICE_STATUS_PROCESS) allow Packing of 4
pointer += ENUM_SERVICE_STATUS_PROCESS.SizePack4;
}
}
}
}
catch (Exception /*e*/)
{
;
}
finally
{
if (handle != IntPtr.Zero)
{
CloseServiceHandle(handle);
}
if (serviceStatusBuffer != IntPtr.Zero)
{
Marshal.FreeHGlobal(serviceStatusBuffer);
}
}
return results;
}
private static extern bool EnumServicesStatusEx(IntPtr hSCManager,
ServiceEnumType infoLevel, ServiceType dwServiceType,
ServiceStateRequest dwServiceState, IntPtr lpServices, UInt32 cbBufSize,
out uint pcbBytesNeeded, out uint lpServicesReturned,
ref uint lpResumeHandle, string pszGroupName);
