How to Convert a C# Structure to a Byte Array Using Marshaling?

In the C#, the structure is converted into byte array

In C#, converting the structure into byte array is a common technique for network data transmission or binary data storage. This guide will demonstrate how to use Marshaling to complete this operation.

The code you provide defines a structure called Cifspacket, which contains various fields that represent the network data packet. To convert this structure to byte array, follow the following steps:

<code class="language-csharp">using System.Runtime.InteropServices;

// 将结构体转换为字节数组的函数
public static byte[] GetBytes(CIFSPacket str)
{
    int size = Marshal.SizeOf(str);
    byte[] arr = new byte[size];

    IntPtr ptr = IntPtr.Zero;
    try
    {
        ptr = Marshal.AllocHGlobal(size);
        Marshal.StructureToPtr(str, ptr, true);
        Marshal.Copy(ptr, arr, 0, size);
    }
    finally
    {
        Marshal.FreeHGlobal(ptr);
    }
    return arr;
}

// 将字节数组转换为结构体的函数
public static CIFSPacket FromBytes(byte[] arr)
{
    CIFSPacket str = new CIFSPacket();

    int size = Marshal.SizeOf(str);
    IntPtr ptr = IntPtr.Zero;
    try
    {
        ptr = Marshal.AllocHGlobal(size);
        Marshal.Copy(arr, 0, ptr, size);
        str = (CIFSPacket)Marshal.PtrToStructure(ptr, str.GetType());
    }
    finally
    {
        Marshal.FreeHGlobal(ptr);
    }
    return str;
}</code>

Please note that for the buffer string field in Cifspacket, you may need to specify the Marshaling property to make it use it correctly with Marshaling. The following is an example:

<code class="language-csharp">[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 100)]
public string Buffer;</code>

Remember, set the sizeConst value according to the maximum expected size of the buffer string.

With these functions, you can use getbytes () to easily convert the Cifspacket structure to byte array, and use Frombytes () to convert it back from the byte array. This provides a convenient method to operate and transmit your structure in binary formats.

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