CEL_HEADER (Windows CE 5.0)
This structure precedes every logged event that is sent out through the logging mechanism.
typedef struct __CEL_HEADER {DWORDLength:16;DWORDID:14;DWORDReserved:1;DWORDfTimeStamp:1;} CEL_HEADER, *PCEL_HEADER;
Members
- Length
The lower 16 bits of the header holds the length, in bytes, of the event structure. This does not include the length of the header structure or the time stamp if it is present. - ID
The next 14 bits of the header are used for the event identifier. - Reserved
This bit is reserved for future use. - fTimeStamp
The upper bit of the header is used to indicate whether or not a time stamp is present. If this bit is set, a 32-bit time stamp follows the structure and the value is given in tick counts. Otherwise, no time stamp follows.
Remarks
This structure is a single DWORD broken into several sections; it will be followed by a DWORD time stamp if the appropriate flag is set.
If you replace the event-tracking engine (Celog.lib) with your own, you should follow the same rules and include CEL_HEADER with each event. CEL_HEADER is attached to the data by CeLogData.
The format of the header has two forms depending on whether the event is a flagged event or not.
The following table shows the format of the non-flagged event header.
| Data | Description |
|---|---|
| T | Flag that indicates whether TIMESTAMP is added to the header (fTimeStamp) |
| TIMESTAMP | Time that an event was recorded |
| ID | Event that occurred (ID) |
| LEN | Length of the data (Length) |
| DATA | Raw data that follows the header |
The following table shows the format of the flagged event header.
| Data | Description |
|---|---|
| T | Flag that indicates whether TIMESTAMP is added to the header (fTimeStamp) |
| CELID_FLAGGED | Identifier that is used to determine whether the event has been flagged and the structure changed |
| TIMESTAMP | Time that an event was recorded |
| ID | Event that occurred (ID) |
| FLAG | User-provided flag use to flag the event |
| LEN | Length of the data (Length) |
| DATA | Raw data that follows the header |
Requirements
OS Versions: Windows CE 3.0 and later.
Header: Celog.h.
See Also
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