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ClassProv
The ClassProv sample
code creates a WMI Class Provider. The
instances are defined using an array named MyDefs which is declared in
classprov.cpp. The class is quite simple
and consists of a string key property and an integer property.
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 type:
NMAKE /f "Makefile"
From Microsoft Visual
C++:
1. Select File + Open Workspace
2. Select the ClassProv.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 ClassProv.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 ClassProv.MOF
At this point, you should be able to exercise the provider using WMI
tools such as WbemDump, CIM Studio or your own WMI application. You can get the instances of
"ClassProvSamp" class, or get the object ClassProvSamp.MyKey="a".
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.