C#

f.SetLength(10240);

f.Write(new byte[] { (byte)'H', (byte)'e', (byte)'l', (byte)'l', (byte)'o' }, 0, 5);  //Added by Bob

int error = Marshal.GetLastWin32Error();

Marshal.PtrToStructure(lpOutBuffer, response);  //Added by Bob

Quote:

System.ArgumentException: 'The specified structure must be blittable or have layout information.

public static int GetSparseRange(SafeFileHandle hdrive, in FILE_ALLOCATED_RANGE_BUFFER query, ref FILE_ALLOCATED_RANGE_BUFFER[] response, out int count)
{
    int nInBufferSize = Marshal.SizeOf(typeof(FILE_ALLOCATED_RANGE_BUFFER));
    IntPtr lpInBuffer = Marshal.AllocHGlobal(nInBufferSize);
    Marshal.StructureToPtr(query, lpInBuffer, false);

    uint bytesreturned = 0, command = (uint)EIOControlCode.FsctlQueryAllocatedRanges;

    int nOutBufferSize = nInBufferSize * 1024;
    IntPtr lpOutBuffer = Marshal.AllocHGlobal(nOutBufferSize);
    DeviceIoControl(
        hdrive,                                                     // device to be queried
        (uint)command,                                              // operation to perform
        lpInBuffer, (uint)nInBufferSize,                            // input buffer
        lpOutBuffer, (uint)nOutBufferSize,
        //ptrArr, (uint)(nInBufferSize * count),                    // output buffer
        out bytesreturned,                                          // # bytes returned
        IntPtr.Zero);                                               // synchronous I/O
    // Get the last error and display it.
    int rc = Marshal.GetLastWin32Error();
    count = (int)bytesreturned / nInBufferSize;
    for (int j = 0; j < count; ++j)
    {
        response[j] = (FILE_ALLOCATED_RANGE_BUFFER)Marshal.PtrToStructure(lpOutBuffer + (j * nInBufferSize), typeof(FILE_ALLOCATED_RANGE_BUFFER));
    }
    Marshal.FreeHGlobal(lpInBuffer);
    Marshal.FreeHGlobal(lpOutBuffer);
    return rc;
}

for (int i = 0; i < count; i++)
{
    IntPtr ptr= new IntPtr(lpOutBuffer.ToInt64() + i * Marshal.SizeOf(typeof(FILE_ALLOCATED_RANGE_BUFFER)));
    response[i] = Marshal.PtrToStructure<FILE_ALLOCATED_RANGE_BUFFER>(ptr);
}

Quote:

I eliminated some properties and added some.

Member 14792393 wrote:

I decided to improve some characteristics and I eliminated some properties and added some.

Member 14792393 wrote:

After I open the form I removed the old control and tried to add the new version, but it appears that only the old version is accepted

<pre>// <auto-generated />
//
// To parse this JSON data, add NuGet 'Newtonsoft.Json' then do:
//
//    using quicktype;
//
//    var welcome = Welcome.FromJson(jsonString);

namespace quicktype
{
    using System;
    using System.Collections.Generic;

    using System.Globalization;
    using Newtonsoft.Json;
    using Newtonsoft.Json.Converters;

    public partial class Welcome
    {
        [JsonProperty("PropertyInfos")]
        public List<PropertyInfo> PropertyInfos { get; set; }
    }

    public partial class PropertyInfo
    {
        [JsonProperty("Identification")]
        public Identification Identification { get; set; }

        [JsonProperty("PropertyName")]
        public string PropertyName { get; set; }

        [JsonProperty("ManagementCompany")]
        public ManagementCompany ManagementCompany { get; set; }

        [JsonProperty("Address")]
        public Address Address { get; set; }
    }

    public partial class Address
    {
        [JsonProperty("Address")]
        public string AddressAddress { get; set; }

        [JsonProperty("City")]
        public string City { get; set; }

        [JsonProperty("State")]
        public string State { get; set; }

        [JsonProperty("PostalCode")]
        [JsonConverter(typeof(ParseStringConverter))]
        public long PostalCode { get; set; }

        [JsonProperty("Email")]
        public string Email { get; set; }
    }

    public partial class Identification
    {
        [JsonProperty("IDValue")]
        [JsonConverter(typeof(ParseStringConverter))]
        public long IdValue { get; set; }
    }

    public partial class ManagementCompany
    {
        [JsonProperty("ManagementCompanyName")]
        public string ManagementCompanyName { get; set; }

        [JsonProperty("Identification")]
        public Identification Identification { get; set; }
    }

    public partial class Welcome
    {
        public static Welcome FromJson(string json) => JsonConvert.DeserializeObject<Welcome>(json, quicktype.Converter.Settings);
    }

    public static class Serialize
    {
        public static string ToJson(this Welcome self) => JsonConvert.SerializeObject(self, quicktype.Converter.Settings);
    }

    internal static class Converter
    {
        public static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
        {
            MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
            DateParseHandling = DateParseHandling.None,
            Converters =
            {
                new IsoDateTimeConverter { DateTimeStyles = DateTimeStyles.AssumeUniversal }
            },
        };
    }

    internal class ParseStringConverter : JsonConverter
    {
        public override bool CanConvert(Type t) => t == typeof(long) || t == typeof(long?);

        public override object ReadJson(JsonReader reader, Type t, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null) return null;
            var value = serializer.Deserialize<string>(reader);
            long l;
            if (Int64.TryParse(value, out l))
            {
                return l;
            }
            throw new Exception("Cannot unmarshal type long");
        }

        public override void WriteJson(JsonWriter writer, object untypedValue, JsonSerializer serializer)
        {
            if (untypedValue == null)
            {
                serializer.Serialize(writer, null);
                return;
            }
            var value = (long)untypedValue;
            serializer.Serialize(writer, value.ToString());
            return;
        }

        public static readonly ParseStringConverter Singleton = new ParseStringConverter();
    }
}

ICARUS999 wrote:

There is a requirement to send and receive data over TCP/IP with a Fiscal (tax) device which acts as a gateway to the Tax authority server.