Marshal. Copy cannot copy data from the offset of the unmanaged pointer. You need to recalculate the value of the unmanaged pointer.

Marshal. Copy cannot copy data from the offset of the unmanaged pointer. You need to recalculate the value of the unmanaged pointer.

///
/// Read data
///
/// Data
/// Start address
/// Number
///
Public int read (ref byte [] bytdata, int lngaddr, int lngsize)
{

If (lngaddr + lngsize> m_memsize) return 2; // exceeds the data Zone
If (m_binit)
{
Int ptrvalue = (INT) m_pwdata; // marshal. Copy cannot copy data from the offset of the unmanaged pointer. You need to recalculate the value of the unmanaged pointer.

// Marshal. Copy (m_pwdata, bytdata, lngaddr, lngsize );

Marshal. Copy (intptr) (ptrvalue + lngaddr), bytdata, 0, lngsize );
// Replace the index at the starting position (starting from scratch) in the startindex target array with the 3rd parameter ). // That is to say, the starting copy point of m_pwdata cannot be changed [unless the intptr value corresponding to m_pwdata is changed]
}
Else
{
Return 1; // the shared memory is not initialized.
}
Return 0; // read Successful

}