ERROR_MORE_DATA - 234 (0xEA)

Technical Meaning

The ERROR_MORE_DATA error code is returned when a read or query operation has completed, but there is additional data available beyond the current buffer size. This indicates that the caller should allocate a larger buffer and retry the operation to retrieve all the available data.

Error Details

This error typically occurs in scenarios where a function reads from a file, device, or network stream, and the amount of data requested does not match the actual amount of data available. The function completes successfully but returns ERROR_MORE_DATA to inform the caller that more data is present beyond what was read.

Usage Context

The ERROR_MORE_DATA error code can be encountered in various functions such as:

• ReadFile: When reading from a file or device, and the buffer size is insufficient to hold all available data.
• GetQueuedCompletionStatusEx: When querying completion status for I/O operations, and more data is available beyond the current buffer.

Developer Interpretation

When encountering ERROR_MORE_DATA, developers should:

• Allocate a larger buffer to accommodate additional data.
• Retry the operation with the updated buffer size.
• Ensure that all necessary data is read or processed in subsequent calls.

Related Errors

• ERROR_INSUFFICIENT_BUFFER: Indicates insufficient memory for the requested operation, but does not imply more data is available beyond the current buffer.
• ERROR_NO_DATA: Indicates no data was found and there is nothing to return.

FAQ

Q: What does ERROR_MORE_DATA mean?

A: It indicates that additional data is available beyond the current buffer size or read operation. The caller should allocate a larger buffer and retry the operation.

Q: How can I handle this error in my code?

A: Allocate a larger buffer, retry the operation, and ensure all necessary data is processed in subsequent calls.

Summary

ERROR_MORE_DATA is an informational error code indicating that more data is available beyond the current buffer size. Developers should allocate a larger buffer and retry the operation to retrieve all available data.