Re: Catching NavigateError in test_browser.py

"Brad Clements" <bkc@xxxxxxxxxxxxx> writes:

> Sorry for the cross-post to ctypes. Venster list seems to be very idle.
>
>
>
> I'm trying to catch NavigateError events in test_browser.
>
> In testing, I added this to the browserWindow class
>
>     def NavigateError(self, this, pDisp, URL, targetFrameName, statusCode, 
> Cancel):
>
>
> 1. what is "this" ?

"this" is an implementation detail.  You may think of it as a reminder
that you are *implementing* a com interface method.

> 2. Cancel is Python type bool, but I'm looking for a POINTER(c_int) as
> described in ie6_gen
>
>
>     DISPMETHOD(0x10f, None, "NavigateError", POINTER(IDispatch), 
> POINTER(VARIANT), POINTER(VARIANT), POINTER(VARIANT), POINTER(c_int)),
>
>
> I need to set Cancel.value = 1
>
> How is it that Cancel is being converted to a bool? I how can I set
> it's value by reference?

The conversion is done in ctypes.com.automation, in the VARIANT class.
And it seems I got it wrong for the VT_BYREF cases.

Maybe you can fix it yourself, by inserting this field in the VARIANT's
class U(Union) _fields_ definition:

    class U(Union):
        _fields_ = [("VT_BOOL", c_short),
                    ("pBool", POINTER(c_short)), # new field
                    ("VT_I1", c_char),
                    ...

and adding this code to the get_value() method, in the giant if: elif:
construct, just before the 'elif self.vt & VT_BYREF:' line:

        elif self.vt == VT_BYREF|VT_BOOL:
            return self._.pBool.contents

After that, the NavigateError method will probably be called with an
c_short instance as last parameter, then you can do Cancel.value = True.
I tested that with the BeforeNavigate2 method (in the
ctypes\com\samples\iexplorer.py file), and it worked for me.

This should probably be fixed for other VT_BYREF types as well.

Thomas



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