VB虽然强大，但要对计算机的底层硬件进行访问却无能为力。由于VC++同时具有汇编语言和高级语言的功能和特点，能够直接控制硬件，因此，可以使用VC++编写一个DLL，库中包含有关对硬件控制的函数，然后在VB程序中通过调用DLL中的函数来完成控制行为，使VB对硬件的操作成为可能。-VB powerful, but would like to access the computer' s underlying hardware is powerless. As the VC++ both assembly language and high-level language features and functions that can directly control the hardware, so you can use the VC++ to write a DLL, the library contains information about the hardware control functions, and then in VB program by calling the DLL' s function complete control behavior, so that the operation of the hardware VB possible.