Article: Q100030
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.0,3.1
Operating System(s):
Keyword(s): kb16bitonly
Last Modified: 05-NOV-1999
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The information in this article applies to:
- Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1
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SYMPTOMS
========
In the MIDIMON sample application provided with Visual C++ and the Microsoft
Windows Software Development Kit (SDK) version 3.1, the midiInputHandler()
callback function causes a general protection (GP) fault.
CAUSE
=====
The GP fault occurs when the MIDI event handler tries to store event data in a
static variable, but the data segment (DS) is not set correctly because the
exported functions in the callback dynamic-link library (DLL) are not exported
correctly.
RESOLUTION
==========
Because the /GD compiler option is specified in the makefile for MIDIMON's
callback DLL, the DLL's exported functions must be declared with the __export
keyword. The exported functions missing the __export keyword are _WEP(),
midiInputHandler(), and PutEvent(). The __export keyword should be added as
required in CALLBACK.H and CALLBACK.DEF.
MORE INFORMATION
================
The problem described above exists only in the version of MIDIMON distributed
with Visual C++ (Microsoft C version 8.0); the original version distributed with
C 7.0 builds correctly as shipped.
Additional query words: 3.10 gp-fault gpf midi
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Keywords : kb16bitonly
Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK300 kbWinSDK310
Version : WINDOWS:3.0,3.1
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