On Wed, 4 Sep 2002, Martin Ding wrote:
> I recently study request but meet more problem.
> Now the meaning of request length puzzled me. For example, the request
> of X_ImageText8
>
> typedef struct {
> CARD8 reqType;
> BYTE nChars;
> CARD16 length B16;
> Drawable drawable B32;
> GContext gc B32;
> INT16 x B16, y B16;
> } xImageTextReq;
>
> I can intercept the request, and as document said, length means the
> request length, but it is related to the string length(nChars).
> During the test, request length can be 5, 18, 19, or 20 or others.
> as xImageTextReq struct occupy 16 bytes, how can I explain 5.
> Could you tell me the meaning about request length? Is it related to the
> struct? if not, how explain the member in struct which may be gotten
> from the request?
The size of the structure is implied by the reqType. Length
is the number of 4-byte chunks beyond the structure that belong to this
request.
Mark.
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