Using VxDs and Software Interrupts Under Win32s (105760)
The information in this article applies to:
- Microsoft Win32s 1.3c
- Microsoft Win32s 1.3
- Microsoft Win32s 1.30a
This article was previously published under Q105760 SUMMARY
Calling VxDs directly from a Win32-based application is not supported under
Win32s. Win32s does not support the VxD interfaces, so the call is handled
by the underlying Windows system. The Win32-based application runs with
32-bit stack and code sections, but Windows expects only 16-bit segments.
Therefore, the calls to the VxD cannot be handled by Windows as expected.
To call software interrupts (such as Interrupt 2F) from a Win32-based
application running under Windows 3.1 via Win32s, place the call in a 16-
bit dynamic-link library (DLL) and use the Universal Thunks to access this
DLL. To convert the addresses between segmented and linear address, use
UTSelectorOffsetToLinear() and UTLinearToSelectorOffset().
Modification Type: | Major | Last Reviewed: | 4/9/2004 |
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Keywords: | kbThunks KB105760 |
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