The description
1, LONG__stdcall OpenCom (void)
Function description: open port
Call this function is called first, the return value is zero represents success



Program statement
The FUNCTION Long OpenCom () LIBRARY "CardReader. DLL
"
The
Long ll_rtn

Ll_rtn=OpenCom ()
Messagebox (' OpenCom () ', a String (ll_rtn))

Error: Bad runtime function reference at line 3 clicked in the event of object cb_1 of w_readcard

What's the problem