input focus

[Peter Harris]

> Having issue trying to resolve what I've learned here and documentation.
> Here's the code:

>   if (r0 != NULL) {
>     if (r0->length != 0) rWindow = r0->focus;

r0->length (the amount of extra data beyond the basic reply) is always 0 for get_input_focus (see GetInputFocus under https://www.x.org/releases/X11R7.7/doc/xproto/x11protocol.html#Encoding::Requests ), so this test will always fail and you'll never set rWindow.

> I get no error, I get no length, and response is 1 instead of
> XCB_GET_INPUT_FOCUS (42) documentation states.

XCB_GET_INPUT_FOCUS (42) is the request number. Replies always have response_type 1 (XCB_REPLY). If the response is 0 (XCB_ERROR), it will be returned in the error pointer instead. Larger response_type numbers are events.

> This is from debugger:
>
> $1 = (xcb_generic_error_t *) 0x0
> $2 = {response_type = 1 '\001', revert_to = 1 '\001', sequence = 14,
> length = 0, focus = 83886080}
>
> Note that focus I believe is the correct response, or at least what I
> expected.
>
> Questions: First, I am supposed to free reply?

Yes.

> second, which replies do
> I not test to see if valid reply,

Always test for valid replies. But test correctly: If the reply pointer is non-NULL, it's a valid reply. If it's not a valid reply, the reply pointer will be NULL and the error pointer will be non-NULL instead.

> Ohh, am I using correctly?

No, see above.

Peter Harris
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