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c++duktape

How create inserted object use duktape?

Have this code:

auto obj_idx = duk_push_object( ctx );

duk_push_string( ctx, "key" );
duk_push_string( ctx, "value" );
duk_put_prop( ctx, obj_idx );
duk_push_string( ctx, "key2" );
duk_push_string( ctx, "value" );
duk_put_prop( ctx, obj_idx );

duk_put_global_string( ctx, "obj" );

How insert new object in obj? No matter how hard I try to insert a nested object, it doesn’t work. Either crash or not inserted.

{
"key": "value",
"key2": "value",
"newObj": {
    "newKey": "value"
}
}
Solution

  • I put the following code into the Duktape hello example and it produced the right result:

    auto obj_idx = duk_push_object( ctx );

duk_push_string( ctx, "key" );
duk_push_string( ctx, "value" );
duk_put_prop( ctx, obj_idx );
duk_push_string( ctx, "key2" );
duk_push_string( ctx, "value" );
duk_put_prop( ctx, obj_idx );

auto nested_idx = duk_push_object(ctx);
duk_push_int(ctx, 2019);
duk_put_prop_string(ctx, nested_idx, "year");

duk_put_prop_string(ctx, obj_idx, "nested");

duk_put_global_string( ctx, "obj" );

duk_eval_string(ctx, "print(JSON.stringify(obj))");

    The key thing to remember is that duk_put_prop and duk_put_prop_string take one value off the stack, while duk_push_* pushes a value on the stack.