Problem:
This project demonstrates the use of an OLE Automation object that returns a variant.
Resolution:
INTRODUCTION
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This project demonstrates the use of an OLE Automation object that returns a variant. You can use an object reference as a return type in this case to hold an instance of the OLEVARIANT class. Variant string types will get converted to a character array object so check for that type on the return data.
SOURCE FILES:
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Program Files Description
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variants.app Project file
clientprog.cbl The main program to run
variantstest.cbl The OLE Automation server program
variantstestTrigger.cbl Trigger program for in-process server
variantstestServer.reg OLE Automation Sever registry file
Resource Files:
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variantstest.rc Type library resource file
REQUIREMENTS:
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You must first register the variantstest.dll server by editing the variantstestServer.reg file and changing the paths to this dll or by building the project and running "regsvr32 variantstest.dll" from a NetExpress command prompt in the location where the dll resides.
OPERATION:
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Run the clientprog program. It will pass a string to the server program indicating what type of data to return in a variant. The client program uses code to check the type of data being returned and displays it.
REFERENCES
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Please see the "Distributed Computing" Programmer's Guide in the Net Express bookshelf, especially the chapter on OLE Data Types.
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Keywords: demonstration, sample, example, demo, variant.zip
demo.ex
demo.ne
