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InstProv
The InstProv sample
code creates a WMI Instance Provider.
The instances are
defined using an array named MyDefs which is declared in instprov.cpp. The class is quite simple and consists of a
string Key property and an integer property.
This sample does not
support any updating.
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 the following:
NMAKE /f “Makefile”
From Microsoft Visual
C++:
1. Select File + Open Workspace
2. Select the InstProv.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 InstProv.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 instprov.mof
At this point, you should be able to access instances of the InstProvSamp
class using WMI tools such as WbemDump, CIM Studio or your own WMI application.
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.