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NS_E_CURL_INVALIDBUFFERSIZE
Diagnosing NS_E_CURL_INVALIDBUFFERSIZE in the Windows Media pipeline
This result (0xC00D1331) is returned at the caller buffer contract disagrees with the length supplied to the URL helper. It identifies the invalidbuffersize URL check, so troubleshooting should begin with the object and operation that own that checkpoint rather than with a broad player reset.
Before any socket is opened, the player decomposes a URL into scheme, authority, host, port, path and escaped data in the invalidbuffersize diagnostic record. It may also combine a relative reference with a base URL or convert a file URL into a path; each operation has a different validity rule when isolating the invalidbuffersize case. In the case of this result, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT at the invalidbuffersize checkpoint.
Where the failure occurs
At the invalidbuffersize URL check, the component has already accepted the earlier prerequisites but cannot cross the boundary described as the caller buffer contract disagrees with the length supplied to the URL helper. That distinction matters: success in opening the file, resolving the host or creating a COM object does not prove that this later operation is valid during a controlled invalidbuffersize retest.
The strongest reproduction is query the required character count, allocate a buffer of that size including the terminator, and rerun with the same input string for evidence about invalidbuffersize. If the same call advances after that single change, the evidence supports the boundary. If it does not, return to the first nested error rather than widening the repair in the invalidbuffersize diagnostic record.
Preserve the raw and parsed URL
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for the invalidbuffersize URL check. |
| Decisive values | the original unmodified string, character count, encoding, base URL if any, parsed scheme, host, port and path, plus required and supplied output-buffer lengths at the invalidbuffersize checkpoint. |
| Object generation | Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce this result after configuration has changed. |
| First nested result | Keep the earliest codec, COM, socket, DNS, parser or provider status before this result; later UI messages are less specific. |
| Comparison case | Use one known-good resource that exercises the same the invalidbuffersize URL check while changing only the rejected precondition. |
One-component URL experiment
- Log
0xC00D1331, it, the exact operation and the first failure time before closing the invalidbuffersize incident. - Preserve the original unmodified string, character count, encoding, base URL if any, parsed scheme, host, port and path, plus required and supplied output-buffer lengths in the invalidbuffersize diagnostic record.
- Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed when isolating the invalidbuffersize case.
- Perform one isolated test: query the required character count, allocate a buffer of that size including the terminator, and rerun with the same input string at the invalidbuffersize checkpoint.
- Repeat through the same API and protocol path; a different player or local-copy test is useful only as a comparison, not as proof that the invalidbuffersize URL check is fixed.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result during a controlled invalidbuffersize retest.
What the parser result proves
| Retest result | Interpretation |
|---|---|
| The identical call still returns the code | The values governing the invalidbuffersize URL check are unchanged, or the caller is still using an older object generation. |
| A fresh object succeeds | Lifetime or cached state contributed to it; correct object recreation instead of applying a machine-wide workaround before closing the invalidbuffersize incident. |
| The call advances to another HRESULT | the invalidbuffersize URL check boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage when isolating the invalidbuffersize case. |
| Only one resource fails | The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage at the invalidbuffersize checkpoint. |
Nearby results are not interchangeable
Main distinction: URL syntax errors occur before server DNS, proxy selection or streaming-session creation while tracing the invalidbuffersize path.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_CURL_CANTDECODE | Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as it. |
NS_E_CURLHELPER_NOTRELATIVE | Use object state and operation order to decide which code is authoritative when both appear in one trace for evidence about invalidbuffersize. |
NS_E_CURLHELPER_NOTAFILE | Retain it separately if it appears only after the condition has cleared. |
Misleading actions
- blindly decoding and re-encoding the whole URL, which can change reserved delimiters and resource identity in the invalidbuffersize diagnostic record.
- Do not erase the first occurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error when isolating the invalidbuffersize case.
- Do not publish credentials, protected-content material or complete private URLs at the invalidbuffersize checkpoint. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the invalidbuffersize URL check.
Technical references
- RFC 3986: URI generic syntax
- Handling URLs with WinINet
- CreateUri
- ParseURL
- Microsoft HRESULT registry
Close the incident only after the original the operation succeeds on a current object and the expected next state is observed during a controlled invalidbuffersize retest.
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