DOC: Interrupt 2Fh Function 1684h Name-based Usage

 Last reviewed: October 20, 1997
Article ID: Q175378
The information in this article applies to:
  • Windows 95 Device Driver Kit (DDK), version 4.0 on the following platform: - Windows 95

SUMMARY

The Windows 95 Device Driver Kit documentation describes how a 16-bit ring 3 application can retrieve the entry point for a VxD's service functions, by specifying the VxD's unique device ID. The documentation omitted an alternate way to specify a VxD by indicating its VxD name. The sample below demonstrates how to do this: 

   xor   bx, bx      ; bx = 0 indicates name-based
   les   di, lpName  ; Name of device being queried
   int   2Fh

   mov   word ptr [DevAddr], di
   mov   word ptr [DevAddr+2], es ; ES:DI contains entry point addr
   or    di, word ptr [DevAddr+2] ; or contains 0:0 on error
   jz    Error
In the documentation of the parameters, please add 

   DeviceID
      Identifies a virtual device. If this value is zero,
      then the ES:DI registers point to an 8-character
      space-padded case-sensitive device name.

Keywords          : NTDDKVDD
Version           : WINDOWS:4.0
Platform          : WINDOWS
Hardware          : x86
Issue type        : kbdocerr

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Last reviewed: October 20, 1997
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