JanDeDobbeleer/oh-my-posh · error

get_Size: 0x%08x

Error message

get_Size: 0x%08x

What it means

After obtaining the sessions vector view, the code asks for its element count via the IVectorView get_Size slot. A non-zero HRESULT is wrapped as "get_Size: 0x%08x" - the session collection size could not be read.

Source

Thrown at src/runtime/smtc_windows.go:274

	if err := awaitAsync(asyncOp); err != nil {
		return nil, fmt.Errorf("await RequestAsync: %w", err)
	}

	var manager unsafe.Pointer
	if hr := comCall(asyncOp, asyncOpGetResults, uintptr(unsafe.Pointer(&manager))); hr != 0 {
		return nil, fmt.Errorf("GetResults manager: 0x%08x", hr)
	}
	defer comRelease(manager)

	var sessions unsafe.Pointer
	if hr := comCall(manager, managerGetSessions, uintptr(unsafe.Pointer(&sessions))); hr != 0 {
		return nil, fmt.Errorf("GetSessions: 0x%08x", hr)
	}
	defer comRelease(sessions)

	var size uint32
	if hr := comCall(sessions, vectorViewGetSize, uintptr(unsafe.Pointer(&size))); hr != 0 {
		return nil, fmt.Errorf("get_Size: 0x%08x", hr)
	}

	for i := uint32(0); i < size; i++ {
		var session unsafe.Pointer
		if hr := comCall(sessions, vectorViewGetAt, uintptr(i), uintptr(unsafe.Pointer(&session))); hr != 0 {
			continue
		}
		info, ok := readMediaSession(session, player)
		comRelease(session)
		if ok {
			return info, nil
		}
	}

	// No matching session in the SMTC list — surface a closed status so the
	// caller hides cleanly, mirroring the PowerShell script's contract.
	return &MediaInfo{Status: "closed"}, nil
}

View on GitHub (pinned to 0976794618)

Solutions

  1. Retry the query - transient COM issues often clear.
  2. If deterministic, verify the hardcoded vtable slot indices (vectorViewGetSize) against the actual IVectorView`1 ABI for the running Windows version.
  3. Confirm the sessions object wasn't double-released (defer comRelease ordering) in modified code.
Defensive patterns

Strategy: fallback

Validate before calling

// Gate on environment before calling
if runtime.GOOS != "windows" { skipMediaSegment() }

Try / catch

info, err := env.QueryMediaPlayer(player)
if err != nil && strings.Contains(err.Error(), "get_Size") {
    return templateWithoutMedia
}

Prevention

When it happens

Trigger: The vectorViewGetSize vtable call on the IVectorView of sessions returns a failing HRESULT, usually from an invalid collection pointer or ABI/vtable-slot mismatch.

Common situations: Windows builds whose WinRT metadata layout differs from the hardcoded vtable offsets; a corrupted or early-released collection object.

Related errors

AI-assisted analysis of JanDeDobbeleer/oh-my-posh@0976794618 (2026-08-31). Data as JSON: /api/errors/2d94b279d5ed2b9e. Report an issue: GitHub.