thx for your answer,first,I am indeed using it as a practice ,because I need to use the card of not NI,I hope I can know how operate hardware in C++?But I find that there are so much definitions in the example about CIN .Perhaps their original definition were closed in some files,really?I have trouble in using C++,because of its various definitions.Do you know the
company ADVANTECH?I am using their cards,it provide us with Labview driver,of course ,they used CIN,but i can't see the C file of the CIN.if I used the card that we made by ourselves,how I can drive it in Labview?