//====================================================================
// Read value from marshaled object (marshaled using AsAny)
// It's quite slow and can return back dangling pointers
// It's only there for backcompact
// People should instead use the IntPtr overloads
//====================================================================
private static unsafe T ReadValueSlow <T>(object ptr, int ofs, Func <IntPtr, int, T> readValueHelper)
{
// Consumers of this method are documented to throw AccessViolationException on any AV
if (ptr == null)
{
throw new AccessViolationException();
}
const int Flags =
(int)AsAnyMarshaler.AsAnyFlags.In |
(int)AsAnyMarshaler.AsAnyFlags.IsAnsi |
(int)AsAnyMarshaler.AsAnyFlags.IsBestFit;
MngdNativeArrayMarshaler.MarshalerState nativeArrayMarshalerState = new MngdNativeArrayMarshaler.MarshalerState();
AsAnyMarshaler marshaler = new AsAnyMarshaler(new IntPtr(&nativeArrayMarshalerState));
IntPtr pNativeHome = IntPtr.Zero;
try
{
pNativeHome = marshaler.ConvertToNative(ptr, Flags);
return(readValueHelper(pNativeHome, ofs));
}
finally
{
marshaler.ClearNative(pNativeHome);
}
}
/// <summary>
/// Write value into marshaled object (marshaled using AsAny) and propagate the
/// value back. This is quite slow and can return back dangling pointers. It is
/// only here for backcompat. People should instead use the IntPtr overloads.
/// </summary>
private static unsafe void WriteValueSlow <T>(object ptr, int ofs, T val, Action <IntPtr, int, T> writeValueHelper)
{
// Consumers of this method are documented to throw AccessViolationException on any AV
if (ptr is null)
{
throw new AccessViolationException();
}
const int Flags =
(int)AsAnyMarshaler.AsAnyFlags.In |
(int)AsAnyMarshaler.AsAnyFlags.Out |
(int)AsAnyMarshaler.AsAnyFlags.IsAnsi |
(int)AsAnyMarshaler.AsAnyFlags.IsBestFit;
MngdNativeArrayMarshaler.MarshalerState nativeArrayMarshalerState = default;
AsAnyMarshaler marshaler = new AsAnyMarshaler(new IntPtr(&nativeArrayMarshalerState));
IntPtr pNativeHome = IntPtr.Zero;
try
{
pNativeHome = marshaler.ConvertToNative(ptr, Flags);
writeValueHelper(pNativeHome, ofs, val);
marshaler.ConvertToManaged(ptr, pNativeHome);
}
finally
{
marshaler.ClearNative(pNativeHome);
}
}
