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It appears as though the *cinterop* tool has generated incorrect mappings for the *rabbitmq-c* library ( <https://github.com/alanxz/rabbitmq-c> ). Trying to set the *content_type* field on a instance of *amqp_basic_properties_t*, based on the amqp_sendstring sample ( <https://github.com/alanxz/rabbitmq-c/blob/master/examples/amqp_sendstring.c#L89> ). However the *content_type* field is read only instead of being writable.

My sample *amqp-client* project can be found here: <https://gitlab.com/napperley/amqp-client>

File a ticket on <http://youtrack.jetbrains.com|youtrack.jetbrains.com>?

IIUC, `content_type` field type is a struct. In this case it is supposed to be `val`. Typically this simplifies accessing the contents of the field. If you need to rewrite the entire aggregate field value, something like this should help:
```amqp_cstring_bytes("text/plain").place(props.content_type.ptr)```


Tried the copy value method:
```amqp_cstring_bytes("text/plain".cstr.ptr).place(props.content_type.ptr)```
However the method doesn't work. The `content_type` field remains empty.

A no string conversion has to be applied to `amqp_cstring_bytes`  in order to set the message body.

Discovered that the memory scope needs to be widened. The contentType C string ptr needs to be allocated in the *publishMessage* function, and passed through as a parameter to the *setupAmqpProperties* function, instead of allocating the C string ptr in the *setupAmqpProperties* function.