[ACCEPTED]-how to convert a value type to byte[] in C#?-arrays
Accepted answer
To convert any value types (not just primitive 1 types) to byte arrays and vice versa:
public T FromByteArray<T>(byte[] rawValue)
{
GCHandle handle = GCHandle.Alloc(rawValue, GCHandleType.Pinned);
T structure = (T)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(T));
handle.Free();
return structure;
}
public byte[] ToByteArray(object value, int maxLength)
{
int rawsize = Marshal.SizeOf(value);
byte[] rawdata = new byte[rawsize];
GCHandle handle =
GCHandle.Alloc(rawdata,
GCHandleType.Pinned);
Marshal.StructureToPtr(value,
handle.AddrOfPinnedObject(),
false);
handle.Free();
if (maxLength < rawdata.Length) {
byte[] temp = new byte[maxLength];
Array.Copy(rawdata, temp, maxLength);
return temp;
} else {
return rawdata;
}
}
The BitConverter class might be what you are looking 3 for. Example:
int input = 123;
byte[] output = BitConverter.GetBytes(input);
If your enum was known to be 2 an Int32 derived type, you could simply 1 cast its values first:
BitConverter.GetBytes((int)commands.one);
For anyone who's interested in how it works 3 without using BitConverter you can do it like this:
// Convert double to byte[]
public unsafe byte[] pack(double d) {
byte[] packed = new byte[8]; // There are 8 bytes in a double
void* ptr = &d; // Get a reference to the memory containing the double
for (int i = 0; i < 8; i++) { // Each one of the 8 bytes needs to be added to the byte array
packed[i] = (byte)(*(UInt64 *)ptr >> (8 * i)); // Bit shift so that each chunk of 8 bits (1 byte) is cast as a byte and added to array
}
return packed;
}
// Convert byte[] to double
public unsafe double unpackDouble(byte[] data) {
double unpacked = 0.0; // Prepare a chunk of memory ready for the double
void* ptr = &unpacked; // Reference the double memory
for (int i = 0; i < data.Length; i++) {
*(UInt64 *)ptr |= ((UInt64)data[i] << (8 * i)); // Get the bits into the right place and OR into the double
}
return unpacked;
}
In 2 reality it's much easier and safer to use 1 BitConverter but it's fun to know!
Source:
stackoverflow.com
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