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EventProvider
The EventProvider
sample demonstrates a WMI event provider.
EventProvider generates a WMI event of class MyEvent every two
seconds. WMI applications can register
to receive these events. The
TempConsumer sample provided with the WMI SDK is a simple example of an
application that registers for and displays the MyEvent class events
generated by this provider.
NOTE: The
EventProvider sample should be built and registered as indicated below prior to
using the TempConsumer sample. Without
the EventProvider sample in place, there will be no events for TempConsumer to
receive. Please refer to the
TempConsumer sample documentation for instructions on building and using the
TempConsumer application.
Building the Provider DLL
The DLL can be built
from the command line using NMAKE, or it can be built using Microsoft Visual
C++.
From the command line
in the sample installation directory:
NMAKE /f "Makefile"
From Microsoft Visual
C++:
1. Select File + Open Workspace
2. Select the EventProvider.DSP file
Registering the DLL and Class
1. The DLL must be registered with COM. From the
command line in the sample installation directory, type the following:
REGSVR32 evprov.dll
2. You must also compile the MOF in order to make the
WMI CIMOM aware of the class. From the
command line in the sample installation directory type the following:
MOFCOMP evprov.mof
General Notes
Things
to remember when you're building your own WMI provider:
1.
WMI interfaces are defined
in wbemcli.h and wbemprov.h found in the wmi\include directory. You may #include both these files by
including just wbemidl.h located in the same directory.
2.
WMI interface CLSIDs are
defined in wbemuuid.lib. If you get unresolved externals in interfaces and
CLSIDs, this is what is missing.
3.
You'll need to link with
oleaut32.lib and ole32.lib to get the needed COM support.
4.
In the Link|Output
settings, specify 'wWinMainCRTStartup' as the entry point. This is per the
Unicode programming instructions.
5.
If you're using the makefiles, don't forget to set the Visual C++
environment variables. This is done by running VCVARS32.BAT.