FUNCTION FReadStr( ptrHandle AS IntPtr, dwBytes AS DWORD ) AS STRING
public static string FReadStr( IntPtr ptrHandle, uint dwBytes )
The low level File IO functions in the X# runtime are using .Net filestreams in the background. |
That means that the file handles returned by FOpen() and FCreate() are not 'normal' file handles, but unique identifiers that are used to find the underlying stream object in a collection of streams in the runtime.
That also means that you can't use file handles for functions such as FRead() and FWrite() that were not created in the X# runtime.
If you want to access the underlying FileStream, then you should call the function FGetStream()
1ptrHandle := FOpen2("new.txt", FC_NORMAL) 2IF ptrHandle = F_ERROR 3 ? DOSErrString(FError()) 4ELSE 5 cString := FReadStr(ptrHandle, 16) 6 ? cString 7 FClose(ptrHandle) 8ENDIF