private unsafe string? GetServiceDisplayName(SafeServiceHandle? scmHandle, string serviceName)
{
var builder = new ValueStringBuilder(4096);
int bufLen;
while (true)
{
bufLen = builder.Capacity;
fixed (char* c = builder)
{
if (Interop.Advapi32.GetServiceDisplayName(scmHandle, serviceName, c, ref bufLen))
break;
}
int lastError = Marshal.GetLastWin32Error();
if (lastError == Interop.Errors.ERROR_SERVICE_DOES_NOT_EXIST)
{
return null;
}
else if (lastError != Interop.Errors.ERROR_INSUFFICIENT_BUFFER)
{
throw new InvalidOperationException(SR.Format(SR.NoService, serviceName, _machineName), new Win32Exception(lastError));
}
builder.EnsureCapacity(bufLen + 1); // Does not include null
}
builder.Length = bufLen;
return builder.ToString();
}
/// <summary>
/// Closes the handle to the service manager, but does not
/// mark the class as disposed.
/// </summary>
/// <remarks>
/// Violates design guidelines by not matching Dispose() -- matches .NET Framework
/// </remarks>
public void Close()
{
if (_serviceManagerHandle != null)
{
_serviceManagerHandle.Dispose();
_serviceManagerHandle = null;
}
_statusGenerated = false;
_startTypeInitialized = false;
_type = Interop.Advapi32.ServiceTypeOptions.SERVICE_TYPE_ALL;
}
/// <summary>
/// Closes the handle to the service manager, but does not
/// mark the class as disposed.
/// </summary>
/// <remarks>
/// Violates design guidelines by not matching Dispose() -- matches .NET Framework
/// </remarks>
public void Close()
{
if (_serviceManagerHandle != null)
{
_serviceManagerHandle.Dispose();
_serviceManagerHandle = null;
}
_statusGenerated = false;
_startTypeInitialized = false;
_type = AllServiceTypes;
}
private void GetDataBaseHandleWithConnectAccess()
{
if (_disposed)
{
throw new ObjectDisposedException(GetType().Name);
}
// get a handle to SCM with connect access and store it in serviceManagerHandle field.
if (_serviceManagerHandle == null)
{
_serviceManagerHandle = GetDataBaseHandleWithAccess(_machineName, Interop.Advapi32.ServiceControllerOptions.SC_MANAGER_CONNECT);
}
}
private static SafeServiceHandle GetDataBaseHandleWithAccess(string machineName, int serviceControlManagerAccess)
{
SafeServiceHandle?databaseHandle = null;
if (machineName.Equals(DefaultMachineName) || machineName.Length == 0)
{
databaseHandle = new SafeServiceHandle(Interop.Advapi32.OpenSCManager(null, null, serviceControlManagerAccess));
}
else
{
databaseHandle = new SafeServiceHandle(Interop.Advapi32.OpenSCManager(machineName, null, serviceControlManagerAccess));
}
if (databaseHandle.IsInvalid)
{
Exception inner = new Win32Exception(Marshal.GetLastWin32Error());
throw new InvalidOperationException(SR.Format(SR.OpenSC, machineName), inner);
}
return(databaseHandle);
}
internal static extern unsafe bool GetServiceKeyName(SafeServiceHandle?SCMHandle, string displayName, char *KeyName, ref int KeyNameLength);
internal static extern IntPtr OpenService(SafeServiceHandle?databaseHandle, string serviceName, int access);
internal static unsafe partial bool GetServiceDisplayName(SafeServiceHandle?SCMHandle, string serviceName, char *displayName, ref int displayNameLength);