How to interpret signature a(sa{sv})

[Krulle86]

Hello togehter,

i have a issue with the above DBus signature (sdbus version 1.0.0).
I interpret it as the following data type: sdbus::Struct< std::string, std::map< std::string, sdbus::Variant >>
Is this correct?
When I call the method, I get the following error:
terminate called after throwing an instance of 'sdbus::Error' what(): [System.Error.ENXIO] Failed to enter a struct (No such device or address)
What does this error tell me and how can I fix it?

Additionally: sdbus::Struct is implemented as std::tuple. Can I use the standard procedure to iterate through the container?

Thanks a lot.

[sangelovic]

The corresponding C++ type for a(sa{sv}) is std::vector<sdbus::Struct<std::string, std::map<std::string, sdbus::Variant>>>. The error tells you that are going to deserialize a struct, but there is an object of another type serialized in the D-Bus message at that location (an array in this case).

You can use the same operations on sdbus::Struct that you'd use on a std::tuple. In newer sdbus-c++ versions, the sdbus::Struct fully implements a tuple protocol, which makes it a tuple-like class (#343).

v1.0 is quite old. I suggest you upgrade to one of the latest versions (v1.6 or, even better, v2.0).