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ERROR_GRAPHICS_DDCCI_INVALID_MESSAGE_LENGTH
Length validation prevents parsing beyond a monitor reply
ERROR_GRAPHICS_DDCCI_INVALID_MESSAGE_LENGTH indicates that the packet's declared payload size is not valid for the command or cannot be reconciled with the received byte count. Causes include truncation, framing misalignment, a faulty bridge, and monitor firmware that calculates the length incorrectly.
Retain both the length field and the total transfer size. Do not infer missing bytes or continue parsing into an application buffer, because subsequent fields and the checksum position depend on the declared length. Compare failures across short VCP replies and longer capability-string fragments; a problem limited to larger responses often points to transport or buffer segmentation rather than an unsupported feature.
Length and framing checks
- Declared payload length and physical byte count received.
- Command type and minimum structure size for that reply.
- Buffer size supplied by the caller and any partial-read behavior.
- Whether only long capabilities responses trigger the error.
References
- Microsoft: sizing a capabilities-string buffer
- Microsoft: retrieving the capabilities reply
- ddcutil: DDC/CI protocol layering
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