ruoruoniao commented on issue #3746:
URL: https://github.com/apache/fory/issues/3746#issuecomment-4677643137
> If the int32 field is fixed int32, it will go to
write_fixed_primitive_fields, otherwise, it wont' go to this function, the
field value will still be writtten as varint32
No... If it works itself, all is OK, but if in `xlang`...
```cpp
//
// Created by MikuSoft on 2026/6/11.
//
#include <fory/serialization/fory.h>
#include <fory/serialization/serializer.h>
#include <fstream>
struct X {
uint32_t a = 0;
uint32_t b = 0;
uint32_t c = 0;
std::vector<uint32_t> d{};
};
FORY_STRUCT(X, a, b, c, d);
int main(const int argc, char **argv) {
fory::serialization::Fory fory =
fory::serialization::ForyBuilder().xlang(true).track_ref(true).build();
fory.register_struct<X>("X");
const auto x = fory.serialize(X{66051, 66051, 66051, {66051, 66051,
66051}});
if (!x.ok()) {
return -1;
}
std::ofstream file("cxx.bin", std::ios::binary);
file.write(reinterpret_cast<const char *>(x.value().data()),
static_cast<uint32_t>(x.value().size()));
file.close();
return 0;
}
```
```python
import pyfory
from pyfory.annotation import *
from dataclasses import dataclass, field
from typing import List
@dataclass
class X:
a: UInt32 = 0
b: UInt32 = 0
c: UInt32 = 0
d: List[UInt32] = field(default_factory=list)
"""
This will cause the same error.
@dataclass
class X:
a: FixedUInt32 = 0
b: FixedUInt32 = 0
c: FixedUInt32 = 0
d: List[FixedUInt32] = field(default_factory=list)
"""
fory = pyfory.Fory(xlang=True, ref=True, strict=True)
fory.register_type(X, typename="X")
with open("cxx.bin", "rb") as f:
data = fory.deserialize(f.read())
print(data)
with open("py.bin", "wb") as f:
f.write(fory.serialize(data))
```
Python will print `X(a=3, b=2, c=1, d=[])`. As you know, `66051` is `0x01
0x02 0x03`. Vector cannot be serialized correct. Also, it cannot convert into
c++ by content in `py.bin`.
You can try yourself.
<img width="460" height="227" alt="Image"
src="https://github.com/user-attachments/assets/77f01c37-8b6a-464a-815d-4918b1a52f55";
/>
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