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we will learn about dynamic vxd in this tutorial. specifically, we will learn how to create, load and use them. 【程序编程相关:ado联结】
deviceiocontrol interface 【推荐阅读:汇编（十）——算术运算类指令】
there are a total of 4 interfaces that vxd provides. vxd services v86 interface protected-mode (pm) interface win32 deviceiocontrol interface we already know about vxd services. v86 and pm interfaces are functions that are callable from v86 and pm applications respectively. since v86 and pm applications are 16-bit, we cannot use those two interfaces from a win32 application. with windows 95, microsoft adds an another interface for win32 applications so they can call on the services of vxds: deviceiocontrol interface.deviceiocontrol interface 【扩展信息:关于ado的介绍】
vxd interfaces
to put it simply, the deviceiocontrol interface is a way for win32 applications to call functions inside vxds. dont confuse functions called via deviceiocontrol with vxd services: they are not the same. for example, deviceiocontrol function 1 may not be the same as vxd service 1. you should think of deviceiocontrol functions as a separate group of functions, provided for use by win32 applications only. since its an interface, there are two sides:on the win32 application side:
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