[python-win32] Need data type identifiers

[Mark Hammond]

All the other comments in this thread are correct, but one other thing 
you can do in recent pywin32 builds is to use win32com.client.VARIANT to 
override how a value is passed - search for 'win32com.client.VARIANT' in 
pywin32.chm for basic docs.

HTH,

Mark

On 21/07/2012 1:55 PM, Fox, Michael K wrote:
> We are having occasional difficulties when we need to pass an argument
> in-and-out of a COM method that we are calling in Python.  There is some
> magic in makepy that normally handles this for us but occasionally it
> fails because it somehow reads the typelib incorrectly and
> misunderstands the data type it must create.  Specifically, I have a C++
> method exposed to COM and it expects an empty SafeArray of two elements
> (double floats) to be passed as an argument.  That method revises the
> array, filling it with two values.  We have found that makepy assigns
> some sort of identifier to each data type.  For instance an array of
> strings is assigned (24584, 3)and an array of variants is assigned
> (24588, 3) as shown in the line of code below, taken from one of the
> wrappers created by Makepy.
>
> def*GetDirection*(/self/, oDirection=(0,0)):
>
> return/self/._ApplyTypes_(1611137025, 1, (24, 0), ((24588,3),),
> u/'GetDirection'/, None, oDirection)
>
> Occasionally pywin32 assigns the wrong identifier then the argument is
> cast as the wrong data type and an error is thrown.  We stumbled upon
> the correct identifier and when we corrected the identifier assigned by
> Makepy then we were able to call the method without throwing an error.
> Where can we find a list of these identifiers?
>
> *Mike Fox*
>
>
>
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