Re: [Pyobjc-dev] Can't bridge UCConvertUTCDateTimeToCFAbsoluteTime

[Ronald O. <ron...@ma...>]

On 26 Nov, 2007, at 21:17, blake wrote:

>> I am trying to bridge UCConvertUTCDateTimeToCFAbsoluteTime using
>> PyObjC in Leopard.
>>
>> The problem that I am running into is that
>> UCConvertUTCDateTimeToCFAbsoluteTime takes a struct that's declared
>> (on 32 bits) as {unsigned short; unsigned long; unsigned short;}  
>> using
>> packed alignment, which means that the offset of the 4-byte long
>> member is 2. When I use {UTCDateTime=SLS}, PyObjC puts the 4-byte  
>> long
>> at offset 4, which then causes problems down the line.
>>
>> Looking at PyObjC source, I don't see a way to force custom alignment
>> of struct members.
>>
>> Did I miss some mechanism for handling this? What are my option?  
>> Thanks,
>>
>> Ben
>
> The problem appears to be that no metadata exists for <CarbonCore/ 
> UTCUtils.h>. You might try running gen_bridge_metadata(1) on  
> CarbonCore.framework, or typecast UTCDateTime to int64_t instead.


Generating metadata won't help. AFAIK metadata doesn't have support  
for packed structs, and PyObjC definitely doesn't even if the metadata  
would.

Casting int64_t should help, but isn't easily possible from Python.  
This could easily be done using metadata though (that is, teach  
gen_bridge_metadata that it should treat a UTCDateTime struct as if it  
is an int64_t) and then generate the required metadata.

Ronald
>
> Blake Chaffin
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