init 0 for last byte for padding terminator about odpi HOT 5 CLOSED

Just tested Kubo Suggestion, it is working fine now.

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I have tried select some data and display by using xxx->value.asBytes.ptr, some is empty some is invalid character comeout

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Can you show us your code? (Use a gist).
Have you looked at the samples?

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If the data are printed as printf("xxx value is: %s\n", xxx->value.asBytes.ptr), use printf("xxx value is: %.*s\n", xxx->value.asBytes.length, xxx->value.asBytes.ptr) instead.

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Kubo has it right. Almost all of the strings in ODPI-C use pointer/length semantics, not null-termination. This is to handle encodings like UTF-16. Unless otherwise stated, you should assume that there is no null byte terminating strings.

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