Appends to the receiver a given number of bytes from a given buffer.
Original signature is '- (void)appendBytes:(const void *)bytes length:(NSUInteger )length'
Available in Mac OS X v10.0 and later.

C# | Visual Basic | Visual C++ |
public: void AppendBytesLength( array<unsigned char>^ bytes, unsigned int length )

An initialized NSMutableData object capable of holding capacity bytes.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)