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Lets say In C++ I got code like this..
void * target
uint32 * decPacket = (uint32 *)target;
So in C# it would be like..
byte[] target;
UInt32[] decPacket = (UInt32[])target;
Cannot convert type byte[] to uint[]
How do I convert this memory aligning thing C++ does to arrays to C#?
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Read the image using the read() method of the ImageIO class. Create a ByteArrayOutputStream object. Write the image to the ByteArrayOutputStream object created above using the write() method of the ImageIO class. Finally convert the contents of the ByteArrayOutputStream to a byte array using the toByteArray() method.
When you want to convert an int value to a byte array, you can use the static method ByteArray. toByteArray(). This method takes an int input and returns a byte array representation of the number.
The BigInteger class has a longValue() method to convert a byte array to a long value: long value = new BigInteger(bytes).
Indirection Struct. It is possible to read byte array as struct in C#: Reading a C/C++ data structure in C# from a byte array You could then create a class instance from that struct.
Well, something close would be to use Buffer.BlockCopy:
uint[] decoded = new uint[target.Length / 4];
Buffer.BlockCopy(target, 0, decoded, 0, target.Length);
Note that the final argument to BlockCopy is always the number of bytes to copy, regardless of the types you're copying.
You can't just treat a byte array as a uint array in C# (at least not in safe code; I don't know about in unsafe code) - but Buffer.BlockCopy will splat the contents of the byte array into the uint array... leaving the results to be determined based on the endianness of the system. Personally I'm not a fan of this approach - it leaves the code rather prone to errors when you move to a system with a different memory layout. I prefer to be explicit in my protocol. Hopefully it'll help you in this case though.
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You can have the cake (avoid allocations) and eat it too (avoid iterations), if you're willing to move to the dark side.
Check out my answer to a related question, in which I demonstrate how to convert float[] to byte[] and vice versa: What is the fastest way to convert a float[] to a byte[]?
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