Need more advanced examples

[JeffWScott]

The address book example doesn't cover my structure and I'm not able to figure out the correct way to implement this. Can someone please point me in the right direction?

Here are the structures.

//transaction.capnp
using V = import "values.capnp";
struct TransactionPayload {
    kwargs @6 :V.Map(Text, V.Value);
}

//values.capnp
struct Map(Key, Value) {
  entries @0 :List(Entry);
  struct Entry {
    key @0 :Key;
    value @1 :Value;
  }
}

The result should look like this:

    kwargs = (
      entries = [
        (key = "foo", value = (text = "bar")),
        (key = "foofoo", value =  (text = "barbar"))
      ])

The value portion I can get to work, I cannot for the life of me figure out how to set the Key.

This is probably too much info, but this is the compiled struct javascript:

export class Map_Entry extends __S {
    adoptKey(value) { __S.adopt(value, __S.getPointer(0, this)); }
    disownKey() { return __S.disown(this.getKey()); }
    getKey() { return __S.getPointer(0, this); }
    hasKey() { return !__S.isNull(__S.getPointer(0, this)); }
    setKey(value) { __S.copyFrom(value, __S.getPointer(0, this)); }
    adoptValue(value) { __S.adopt(value, __S.getPointer(1, this)); }
    disownValue() { return __S.disown(this.getValue()); }
    getValue() { return __S.getPointer(1, this); }
    hasValue() { return !__S.isNull(__S.getPointer(1, this)); }
    setValue(value) { __S.copyFrom(value, __S.getPointer(1, this)); }
    toString() { return "Map_Entry_" + super.toString(); }
}
Map_Entry._capnp = { displayName: "Entry", id: "e243243ac908507f", size: new __O(0, 2) };
export class Map extends __S {
    adoptEntries(value) { __S.adopt(value, __S.getPointer(0, this)); }
    disownEntries() { return __S.disown(this.getEntries()); }
    getEntries() { return __S.getList(0, Map._Entries, this); }
    hasEntries() { return !__S.isNull(__S.getPointer(0, this)); }
    initEntries(length) { return __S.initList(0, Map._Entries, length, this); }
    setEntries(value) { __S.copyFrom(value, __S.getPointer(0, this)); }
    toString() { return "Map_" + super.toString(); }
}

Ideally I would just want to do this:

        this.kwargsMap = this.payload.initKwargs();
        this.kwargEntries = this.kwargsMap.initEntries(1)
        this.kwargEntries.get(0).setKey('foo')
        
        let valuePointer = new capnp.Message().initRoot(capnpValues.Value);
        valuePointer.setText('bar');
        this.kwargEntries.get(0).setValue(valuePointer)

The second part does work, the value is set (The values structure exists I just didn't share it),
But the setKey() method throws this error

TypeError: Cannot read property 'isWordZero' of undefined

Which I deduced means it's looking for a pointer object. For the life of me I can't figure out how to create that "Key" pointer.

Any help would be greatly appreciated!

[JeffWScott]

So I've learned that this type of structure is a "Generics" structure.

Looks like I need to create an Anypointer for "Text".

I cannot find any documentation on how that is accomplished. Everything is in C++ or Python.

[JeffWScott]

This was the solution:

        let keyMessage = new capnp.Message().initRoot(capnp.Text);
        keyMessage.set(0, 'foo')
        this.kwargEntries.get(0).setKey(keyMessage)

[JeffWScott]

let keyMessage = new capnp.Message().initRoot(capnp.Text);
keyMessage.set(0, 'foo')
this.kwargEntries.get(0).setKey(keyMessage)

Turns out this is not the solution I hoped for. I was working with the js file. When I instituted this fix in the ts file it does not compile. The error is:

error TS2345: Argument of type 'typeof Text' is not assignable to parameter of type 'StructCtor<Text>'.
  Types of property '_capnp' are incompatible.
    Property 'id' is missing in type '_ListCtor' but required in type '_StructCtor'.

[vivekpm]

Need corresponding Java code example to get and set entries in Map. Any pointers?

[SarantopoulosKon]

I wonder if anyone has a solution for this, i'm in a similar situation i have a generic Map struct, and whenever i try to myStruct.initEntries(num) if num > 0 i get the following error:

CAPNP-TS021 Attempted to access out-of-bounds struct pointer (Metadata_Struct_Pointer_0@0x00005cf0,[00 00 00 00 00 00 00 00],limit:0x7fffffff, index: 0, length: 0)

If i convert Map to a non-generic struct then everything works, (something i want to avoid, since i don't have access to the capnp schema).

Package version: 0.4.0