/// <summary>
/// Enumerates services in the specified service control manager database.
/// The name and status of each service are provided.
/// </summary>
/// <returns>
/// An IEnumerable of <see cref="ENUM_SERVICE_STATUS"/> structures that receive the name and service status information for each service in the database.
/// </returns>
/// <exception cref="Win32Exception">If the method fails, returning the calling thread's last-error code value.</exception>
public static unsafe IEnumerable <ENUM_SERVICE_STATUS> EnumServicesStatus()
{
using (var scmHandle = OpenSCManager(null, null, ServiceManagerAccess.SC_MANAGER_ENUMERATE_SERVICE))
{
if (scmHandle.IsInvalid)
{
throw new Win32Exception();
}
int bufferSizeNeeded = 0;
int numServicesReturned = 0;
int resumeIndex = 0;
if (EnumServicesStatus(
scmHandle,
ServiceType.SERVICE_WIN32,
ServiceStateQuery.SERVICE_STATE_ALL,
IntPtr.Zero,
0,
ref bufferSizeNeeded,
ref numServicesReturned,
ref resumeIndex))
{
return(Enumerable.Empty <ENUM_SERVICE_STATUS>());
}
var lastError = GetLastError();
if (lastError != Win32ErrorCode.ERROR_MORE_DATA)
{
throw new Win32Exception(lastError);
}
fixed(byte *buffer = new byte[bufferSizeNeeded])
{
if (!EnumServicesStatus(
scmHandle,
ServiceType.SERVICE_WIN32,
ServiceStateQuery.SERVICE_STATE_ALL,
buffer,
bufferSizeNeeded,
ref bufferSizeNeeded,
ref numServicesReturned,
ref resumeIndex))
{
throw new Win32Exception();
}
var result = new ENUM_SERVICE_STATUS[numServicesReturned];
byte *position = buffer;
int structSize = Marshal.SizeOf(typeof(ENUM_SERVICE_STATUS));
for (int i = 0; i < numServicesReturned; i++)
{
result[i] = (ENUM_SERVICE_STATUS)Marshal.PtrToStructure(new IntPtr(position), typeof(ENUM_SERVICE_STATUS));
position += structSize;
}
return(result);
}
}
}
internal Service(ENUM_SERVICE_STATUS status)
{
Name = status.lpServiceName;
DisplayName = status.lpDisplayName;
//ProcessId = status.serviceStatus.dwProcessId;
State = (ServiceState)status.serviceStatus.dwCurrentState;
}
/// <summary>
/// Enumerates services in the specified service control manager database.
/// The name and status of each service are provided.
/// </summary>
/// <returns>
/// An IEnumerable of <see cref="ENUM_SERVICE_STATUS"/> structures that receive the name and service status information for each service in the database.
/// </returns>
/// <exception cref="Win32Exception">If the method fails, returning the calling thread's last-error code value.</exception>
public static unsafe IEnumerable<ENUM_SERVICE_STATUS> EnumServicesStatus()
{
using (var scmHandle = OpenSCManager(null, null, ServiceManagerAccess.SC_MANAGER_ENUMERATE_SERVICE))
{
if (scmHandle.IsInvalid)
{
throw new Win32Exception();
}
int bufferSizeNeeded = 0;
int numServicesReturned = 0;
int resumeIndex = 0;
if (EnumServicesStatus(
scmHandle,
ServiceType.SERVICE_WIN32,
ServiceStateQuery.SERVICE_STATE_ALL,
IntPtr.Zero,
0,
ref bufferSizeNeeded,
ref numServicesReturned,
ref resumeIndex))
{
return Enumerable.Empty<ENUM_SERVICE_STATUS>();
}
var lastError = GetLastError();
if (lastError != Win32ErrorCode.ERROR_MORE_DATA)
{
throw new Win32Exception(lastError);
}
fixed (byte* buffer = new byte[bufferSizeNeeded])
{
if (!EnumServicesStatus(
scmHandle,
ServiceType.SERVICE_WIN32,
ServiceStateQuery.SERVICE_STATE_ALL,
buffer,
bufferSizeNeeded,
ref bufferSizeNeeded,
ref numServicesReturned,
ref resumeIndex))
{
throw new Win32Exception();
}
var result = new ENUM_SERVICE_STATUS[numServicesReturned];
byte* position = buffer;
int structSize = Marshal.SizeOf(typeof(ENUM_SERVICE_STATUS));
for (int i = 0; i < numServicesReturned; i++)
{
result[i] = (ENUM_SERVICE_STATUS)Marshal.PtrToStructure(new IntPtr(position), typeof(ENUM_SERVICE_STATUS));
position += structSize;
}
return result;
}
}
}
EnumServicesStatusW(int hSCManager,
uint dwServiceType,
uint dwServiceState,
ref ENUM_SERVICE_STATUS lpServices,
uint cbBufSize,
ref uint pcbBytesNeeded,
ref uint lpServicesReturned,
ref uint lpResumeHandle);
public static extern int EnumServicesStatusW(int hSCManager,
uint dwServiceType,
uint dwServiceState,
ref ENUM_SERVICE_STATUS lpServices,
uint cbBufSize,
ref uint pcbBytesNeeded,
ref uint lpServicesReturned,
ref uint lpResumeHandle);
public static extern int EnumDependentServicesW( int hService,
uint dwServiceState,
ref ENUM_SERVICE_STATUS [] lpServices,
uint cbBuffSize,
ref uint pcbBytesNeeded,
ref uint lpServicesReturned);
private static ServiceController [] GetDependentServices(string serviceName, string machineName)
{
IntPtr scHandle = IntPtr.Zero;
IntPtr svcHandle = IntPtr.Zero;
IntPtr buffer = IntPtr.Zero;
try {
scHandle = OpenServiceControlManager(machineName,
SERVICE_MANAGER_RIGHTS.SC_MANAGER_CONNECT);
svcHandle = OpenService(scHandle, serviceName, SERVICE_RIGHTS.SERVICE_ENUMERATE_DEPENDENTS);
if (svcHandle == IntPtr.Zero)
{
throw CreateCannotOpenServiceException(serviceName, machineName);
}
uint bufferSize = 0;
uint bytesNeeded = 0;
uint servicesReturned = 0;
ServiceController [] services;
while (true)
{
if (!EnumDependentServices(svcHandle, SERVICE_STATE_REQUEST.SERVICE_STATE_ALL, buffer, bufferSize, out bytesNeeded, out servicesReturned))
{
int err = Marshal.GetLastWin32Error();
if (err == ERROR_MORE_DATA)
{
buffer = Marshal.AllocHGlobal((int)bytesNeeded);
bufferSize = bytesNeeded;
}
else
{
throw new Win32Exception(err);
}
}
else
{
int iPtr = buffer.ToInt32();
services = new ServiceController [servicesReturned];
for (int i = 0; i < servicesReturned; i++)
{
ENUM_SERVICE_STATUS serviceStatus = (ENUM_SERVICE_STATUS)Marshal.PtrToStructure(
new IntPtr(iPtr), typeof(ENUM_SERVICE_STATUS));
// TODO: use internal ctor that takes displayname too ?
services [i] = new ServiceController(serviceStatus.pServiceName,
machineName);
// move on to the next services
iPtr += ENUM_SERVICE_STATUS.SizeOf;
}
// we're done, so exit the loop
break;
}
}
return(services);
} finally {
if (scHandle != IntPtr.Zero)
{
CloseServiceHandle(scHandle);
}
if (svcHandle != IntPtr.Zero)
{
CloseServiceHandle(svcHandle);
}
if (buffer != IntPtr.Zero)
{
Marshal.FreeHGlobal(buffer);
}
}
}
