internal static PeerToPeerException CreateFromHr(string message, Int32 hr)
{
PeerToPeerException p2pEx = null;
int facility = ((hr >> 16) & 0x1FFF);
IntPtr NativeMessagePtr = IntPtr.Zero;
try
{
UInt32 dwLength = UnsafeSystemNativeMethods.FormatMessage(
FormatMessageFlags.FORMAT_MESSAGE_ALLOCATE_BUFFER |
FormatMessageFlags.FORMAT_MESSAGE_ARGUMENT_ARRAY |
(facility == FACILITY_P2P ? FormatMessageFlags.FORMAT_MESSAGE_FROM_HMODULE : FormatMessageFlags.FORMAT_MESSAGE_FROM_SYSTEM),
(facility == FACILITY_P2P ? PeerToPeerOSHelper.P2PModuleHandle : IntPtr.Zero),
(uint)(hr),
0,
ref NativeMessagePtr,
0,
IntPtr.Zero);
if (dwLength != 0)
{
string NativeMessage = Marshal.PtrToStringUni(NativeMessagePtr);
p2pEx = new PeerToPeerException(message, new Win32Exception(hr, NativeMessage));
}
else
{
p2pEx = new PeerToPeerException(message, Marshal.GetExceptionForHR(hr));
}
}
catch (Exception ex)
{
Logging.P2PTraceSource.TraceEvent(TraceEventType.Warning, 0, "Could not get the error message for error code {0} - Exception {1}", hr, ex);
if (ex is ThreadAbortException || ex is StackOverflowException || ex is OutOfMemoryException)
{
throw;
}
}
finally
{
if (NativeMessagePtr != IntPtr.Zero)
{
UnsafeSystemNativeMethods.LocalFree(NativeMessagePtr);
}
}
if (p2pEx == null)
{
Logging.P2PTraceSource.TraceEvent(TraceEventType.Warning, 0, "Could not get the error message for error code {0}", hr);
p2pEx = new PeerToPeerException(message + "Underlying native error " + hr);
}
Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "Exception: {0}", p2pEx);
return(p2pEx);
}
static PeerToPeerOSHelper()
{
if (IsSupportedOS())
{
// if OS is supported, but p2p.dll is not available, P2P is not supported (original behavior)
string dllFileName = Path.Combine(Environment.SystemDirectory, UnsafeP2PNativeMethods.P2P);
s_P2PLibrary = SafeLoadLibrary.LoadLibraryEx(dllFileName);
if (!s_P2PLibrary.IsInvalid)
{
IntPtr Address = UnsafeSystemNativeMethods.GetProcAddress(s_P2PLibrary, "PeerCreatePeerName");
if (Address != IntPtr.Zero)
{
s_supportsP2P = true;
}
}
}
//else --> the SafeLoadLibrary would have already been marked
// closed by the LoadLibraryEx call above.
}