MicroGery commented on issue #39792:
URL: https://github.com/apache/arrow/issues/39792#issuecomment-1912945362
jduo:37704-java-schema-tobytearray
` /**
* Returns the serialized flatbuffer bytes of the schema wrapped in a
message table.
* Use {@link #deserializeMessage() to rebuild the Schema.}
*/
public byte[] serializeAsMessage() {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try (WriteChannel channel = new WriteChannel(Channels.newChannel(out))) {
long size = MessageSerializer.serialize(
new WriteChannel(Channels.newChannel(out)), this);
return out.toByteArray();
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}`
Yes, I used the serializeAsMessage method, which uses MessageSerializer, and
I got an array starting with oxffffff. According to @zeroshade , the valid
length is 768 bytes indicated by the second 32-bit integer. Now I'm trying to
construct an arrow::Schema object in C++ code using the ReadSchema method you
said. How do I create an io::InputStream? Is it through Buffer or BufferReader?
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