CVI裡面好像真的沒有辦法寫出這種功能，我找到最接近的是用Windows API去檢查輸入的COM Port是否正確。
http://digital.ni.com/public.nsf/allkb/37EC9685EC1C87B4862579D1004095C7
如果不正確會要求重新輸入。
但是這種做法跟原本CVI隨附的範例serial.cws好像是一樣的，沒有辦法直接enumerate COM Port出來。
就算用了Find VISA Resource的範例好像也是不行，範例裡面有如下的解釋。
/*********************************************************************/
/* This example demonstrates how you might query your system for */
/* a particular instrument. This example queries for all */
/* GPIB, serial or VXI instruments. Notice that VISA is able to */
/* find GPIB and VXI instruments because the instruments have a */
/* predefined protocol. But serial instruments do not. Hence, */
/* VISA merely indicates that a serial port is available. */
/* */
/* The general flow of the code is */
/* Open Resource Manager */
/* Use viFindRsrc() to query for the first available instrument */
/* Open a session to this device */
/* Find the next instrument using viFindNext() */
/* Open a session to this device. */
/* Loop on finding the next instrument until all have been found*/
/* Close all VISA Sessions */
/*********************************************************************/
所以我想在CVI裡面應該是目前還沒有辦法做到自動列舉COM Port的功能
