How do you create global variables in a C++ plugin?

[琥珀 猫太郎]

How do you create global variables in a C++ plugin?

[Manan Joshi · Accepted solution]

Multiple ways I suppose. I am stating generically as I don't know your specific context/usecase

Staying within the InDesign SDK constructs you can use the following

• Add non persistent interface to boss classes like session, workspace. Set and get them as per your needs

• Using IBlackBoxCommands which can store key/value pairs

Outside InDesign SDK

• Something like a singleton class which is set/get as needed and accessible in any code file

-Manan

[琥珀 猫太郎]

>>Add non persistent interface to boss classes like session, workspace. Set and get them as per your needs

// .fr
resource ImplementationAlias(1)
{
	{
		kMyIntDataImpl, kIntDataImpl,
	}
};
resource ClassDescriptionTable(kMyClassDescriptionTableResourceID)
{{{
	AddIn
	{
		kSessionBoss,
		kInvalidClass,
		{
			IID_IMYINTDATA, kMyIntDataImpl,
		}
	},
}}};

// .cpp
InterfacePtr<IIntData> iIntData(::GetExecutionContextSession(), IID_IMYINTDATA);

That's how it went, and this method worked out well.

Adding class variables also requires a header, but it worked out fine.
For example, I've added class variables to the script provider and am using them.

[Manan Joshi]

Great news. Look into the IBlackBoxCommands as well. The good thing about this is that you are saved the work to add things in the fr. You can straightaway use them in the cpp files

-Manan