Question

我正在尝试使用C实现序列化数据。（简化的）模式是这样的：

[{
"type" : "record",
"name" : "Global",
"fields" : [
  {
    "name" : "source", 
    "type" : "string"
  },
  {
    "name" : "timestamp", 
    "type" : "long"
  }]
 },
{ 
"type" : "record",
"name" : "seb_sup",
"fields" : [
  {
    "name" : "global", 
    "type" : "Global"
  }
]
}]

我找不到使用C API的正确方法。我已经尝试过这样的事情：

avro_schema_t sch_seb_sup = avro_schema_get_subschema (sch_schema, "seb_sup");
check_p (iface = avro_generic_class_from_schema (sch_seb_sup));

avro_value_t seb_sup;
check_i (avro_generic_value_new (iface, &seb_sup));

// populate the global part

avro_value_t global;
check_i (avro_value_get_by_name (&seb_sup, "global", &global, NULL));

check_i (avro_value_get_by_name (&global, "source", &field, NULL));
check_i (avro_value_set_string (&field, "seb"));

check_i (avro_value_get_by_name (&global, "timestamp", &field, NULL));
check_i (avro_value_set_long (&field, 12345678));

check_i (avro_file_writer_append_value (db, &seb_sup));

，但是执行显示错误：错误：从未为Global创建值实现

我应该如何使用C API？

关于， Arnaud

Avro模式和C实现

0 个答案: