difference between a blob and a byte []?

[Cipherous]

I am working with the com object and I have not loading anything from a server

the COM object has the following function

ReadFromBlob (int memoryAddressOfTheBlob)

and I have this byte array which has the data that SHOULD be read by the function

I have tried the following but it seems very persnickety, sometimes it loads and sometimes it doesn't

I have tried

assume byteArray is already allocated and has the data already loaded

unsafe
{
fixed (byte* ptr = byteArray)
{
GlobalLock ((int)prt);//global function that
ComObject.ReadFromBlob ((int)ptr);
}
}