Microsoft KB Archive/160621

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PRB: DLLEntry in SNMP testdll Sample Does Not Get Called

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Q160621

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK), on platform(s):
 * Microsoft Windows 95
 * the operating system: Microsoft Windows NT, versions 3.51, 4.0

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SYMPTOMS
DLLEntry, the entry point in the Win32 SDK SNMP extension agent sample, testdll, does not get called. As a result, if you model your own SNMP extension agent on the testdll sample, any code you run during DLL initialization and/or cleanup will not get called. This is not a problem for this sample, however, because it does not run any code during DLL initialization/cleanup and thus does not impact its proper running.

CAUSE
The problem arises because DLLEntry is not specified in the makefile as the DLL entry point.

RESOLUTION
The workaround is to change the DLL entry point to DllMain or to specify DLLEntry as the entry point in the link line of the makefile.

It can be easier and safer to change the DLL entry point name to DllMain than to modify the link line in the makefile to use DLLEntry as the entry point. This is because the C Run Time is automatically initialized if the DLL entry point is named DllMain without any additional changes to the code required.

STATUS
This behavior is by design.