DLL Importing a class from the calling EXE

[DKScherpy]

I've got a problem with a DLL calling a function from a class in the EXE. Here's the scenario I have. My app needs to give the user the a certain ability if and only if the DLL is present on their machine. (In this case it is a DLL I wrote to print a custom report). So if the DLL exists, when the report is called, the exe passes the object to make the report from to the DLL and the DLL goes to work and make the report. What I need to be able to do, is to support the object changing in the EXE (new functions, new class members - basically, to be able to change the memory map of the object) and for the DLL (even if it is 3 generations older than the calling EXE) to still take in the object and create the report. This way, the customer can just keep their original custom DLL but still get updates to the product. Anybody know a way to do this? Thanks Dave

[led mike]

DKScherpy wrote:

Anybody know a way to do this?

You mean using an "Interface"?

led mike

[DKScherpy]

Possibly - I kind of understand what an interface is/works. Can you, or anyone, give me a link or source that I can find an example of? -- modified at 9:06 Friday 15th December, 2006

[led mike]

DKScherpy wrote:

Can you, or anyone, give me a link or source that I can find an example of?

You should try looking at the "Articles" here on Code Project. They are a great resource. Using Interfaces in C++[^]

led mike