And given de example on https://criollo.io:
- The class name is CRServer, not CRApplication
- The selector is “get:block:” instead of “get_block:”, which also means the
block is argument 3 instead of 2.
>> objc.registerMetaDataForSelector(
>> b'CRServer',
>> b’get:block:',
>> {
>> 'arguments': {
>> 3: {
>> 'callable': {
>> 'arguments': {
>> 0:{'type': b'^v'},
>> 1:{'type': b'@'},
>> 2:{'type': b'@'},
>> 3:{'type': b'@'}
>> },
>> 'retval': { 'type': b'v' }
>> }
>> }
>> }
>> }
>> )
and later:
>> server.get_block_("/", helloHandler)
>
—
Twitter: @ronaldoussoren
Blog: https://blog.ronaldoussoren.net/
> On 7 Jan 2020, at 10:00, Ronald Oussoren via Pythonmac-SIG
> <[email protected]> wrote:
>
> Hi,
>
> You also need to remove the call to objc.selector. With correct metadata
> “blocks” are callables in Python code.
>
> Ronald
> —
>
> Twitter: @ronaldoussoren
> Blog: https://blog.ronaldoussoren.net/ <https://blog.ronaldoussoren.net/>
>
>> On 6 Jan 2020, at 23:59, Rand Dvorak <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Same result:
>>
>> Updated code:
>>
>> import objc
>> CRApplication = objc.lookUpClass("CRApplication")
>> objc.registerMetaDataForSelector(
>> b'CRApplication',
>> b'get_block_',
>> {
>> 'arguments': {
>> 2: {
>> 'callable': {
>> 'arguments': {
>> 0:{'type': b'^v'},
>> 1:{'type': b'@'},
>> 2:{'type': b'@'},
>> 3:{'type': b'@'}
>> },
>> ' retval': { 'type': b'v' }
>> }
>> }
>> }
>> }
>> )
>> global server
>>
>> def helloHandler(self, request, response, handler):
>> response.send_("Hello World!")
>> handler()
>>
>> if __name__ == "__main__":
>> server = CRApplication.sharedApplication().delegate().server()
>> server.get_block_("/", objc.selector(helloHandler, signature=b'v@:@@@'))
>> server.startListening()
>>
>>
>> results:
>>
>> Traceback (most recent call last):
>> File "main.py", line 37, in <module>
>> server.get_block_("/", objc.selector(helloHandler, signature=b'v@:@@@'))
>> TypeError: Argument 3 is a block, but no signature available
>>
>>
>>> On Jan 6, 2020, at 09:27, Ronald Oussoren <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>>
>>>
>>>> On 6 Jan 2020, at 00:51, Rand Dvorak <[email protected]
>>>> <mailto:[email protected]>> wrote:
>>>>
>>>>
>>>> I am trying to implement a simple server in PyObjC for the Criollo HTTP
>>>> server. The server has a method to set route handlers by passing a block
>>>> to setup the route and then when it receives and HTTP request for the
>>>> route it calls the block. The block has the signature:
>>>>
>>>> typedef void(^CRRouteBlock)(CRRequest* _Nonnull request, CRResponse*
>>>> _Nonnull response, CRRouteCompletionBlock _Nonnull completionHandler);
>>>>
>>>>
>>>> So, here is my simple proof of concept:
>>>>
>>>> import objc
>>>> CRApplication = objc.lookUpClass("CRApplication")
>>>> global server
>>>>
>>>> def helloHandler(self, request, response, handler):
>>>> response.send_("Hello World!")
>>>> handler()
>>>>
>>>> if __name__ == "__main__":
>>>> server = CRApplication.sharedApplication().delegate().server()
>>>> server.get_block_("/", objc.selector(helloHandler,
>>>> signature=b'v@:@@@‘)) *** error occurs here
>>>> server.startListening()
>>>>
>>>>
>>>> But, when I try to setup the route I get the following error:
>>>>
>>>> Traceback (most recent call last):
>>>> File "main.py", line 21, in <module>
>>>> server.get_block_("/", objc.selector(helloHandler, signature=b'v@:@@'))
>>>> TypeError: Argument 3 is a block, but no signature available
>>>>
>>>>
>>>> Any ideas how to workaround this issue and implement the route handlers in
>>>> PyObjC?
>>>
>>> The code below should do the trick, but eas typed directly into this mail
>>> and might therefore contain syntax errors.
>>>
>>> import objc
>>> objc.registerMetaDataForSelector(
>>> b”CRApplication”, # name of the class implementing “get_block:”, or
>>> “NSObject”
>>> b”get_block:”,
>>> {
>>> “arguments”: {
>>> 2: {
>>> “callable”: {
>>> “arguments”: {
>>> 0: { “type”: b”^v” },
>>> 1: { “type”: b”@” },
>>> 2: { “type”: b”@” },
>>> 3: { “type”: b”@” }
>>> },
>>> “retail”: { “type”: b”v” }
>>> }
>>> }
>>> }
>>> )
>>>
>>> This tells the bridge the signature for the block argument of the
>>> “get_block:” selector, which is information that cannot be retrieved from
>>> the Objective-C runtime. Argument 2 is the first real argument of ObjC
>>> selectors, after the implicit arguments “self” and “_imp” (which is not
>>> available in python code).
>>>
>>> Ronald
>>> —
>>>
>>> Twitter: @ronaldoussoren
>>> Blog: https://blog.ronaldoussoren.net/ <https://blog.ronaldoussoren.net/>
>>>> _______________________________________________
>>>> Pythonmac-SIG maillist - [email protected]
>>>> <mailto:[email protected]>
>>>> https://mail.python.org/mailman/listinfo/pythonmac-sig
>>>> <https://mail.python.org/mailman/listinfo/pythonmac-sig>
>>>> unsubscribe: https://mail.python.org/mailman/options/Pythonmac-SIG
>>>> <https://mail.python.org/mailman/options/Pythonmac-SIG>
>>>
>>
>
> _______________________________________________
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