[英]how to convert a value type to byte[] in C#?
我想做的等效於:
byte[] byteArray;
enum commands : byte {one, two};
commands content = one;
byteArray = (byte*)&content;
是的,現在是一個字節,但是考慮到我將來要更改嗎? 如何使byteArray包含內容? (我不在乎復制它)。
要將任何值類型(不僅僅是原始類型)轉換為字節數組,反之亦然:
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;
}
}
您正在尋找BitConverter類。 例:
int input = 123;
byte[] output = BitConverter.GetBytes(input);
如果已知您的枚舉是Int32派生類型,則可以簡單地首先強制轉換其值:
BitConverter.GetBytes((int)commands.one);
您可以使用BitConverter.GetBytes方法執行此操作。
對於不使用BitConverter
對其工作方式感興趣的任何人,您都可以這樣做:
// 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;
}
實際上,使用BitConverter
更加容易和安全,但是很有趣!
您也可以進行簡單的轉換並將其傳遞給數組構造函數。 它的長度也類似於BitConverter
方法。
new[] { (byte)mode }
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