Hey I was wondering if there is a fix for the following issue as i can't seem to find one anywhere and I have now ran out of ideas.
I am writing a program using Xamarin.Forms to run across both android and IOS, the following both code versions work on android, However throws a ExecutionEngineException when the second version is ran on IOS but the first one works.
protected static object ReadStruct(BinaryReader reader, Type structType, ChunkHeader chunkHeader)
{
int size = Marshal.SizeOf(structType);
if (size != chunkHeader.chunkSize) // check the actual size of this chunk object with the expected size from the stream
{
throw new IOException("Invalid file format, incorrect " + chunkHeader.chunkName + " chunk size (exp.: " + size + ", read: " + chunkHeader.chunkSize + ")");
}
byte[] data = reader.ReadBytes(size);
IntPtr buffer = Marshal.AllocHGlobal(size);
Marshal.Copy(data, 0, buffer, size);
// the line that crashes follows this
object structObject = Marshal.PtrToStructure(buffer, structType);
Marshal.FreeHGlobal(buffer);
return structObject;
}
The above code stays the same in both versions.
public struct OvdBChunk
{
// stuff in here but not important
}
The above sample works but for this and all future updates i will need to inherit the old versions as stuff may have been updated in newer devices so have been added to but will always keep the old stuff so i changed it to the following
public class OvdBChunk : OvdAChunk
{
// stuff in here but not important
}
The structType in part is the part that is changing in the top code snippet.
Any idea why when it is a class instead of a strut it throws the System.ExecutionEngineException. and any ideas on how i can fix it?
