So much for typing code in Mail.app…. “Retail” should be “retval”.
Ronald — Twitter: @ronaldoussoren Blog: https://blog.ronaldoussoren.net/ > On 6 Jan 2020, at 15:27, Ronald Oussoren via Pythonmac-SIG > <pythonmac-sig@python.org> wrote: > > > >> On 6 Jan 2020, at 00:51, Rand Dvorak <randdvo...@gmail.com> 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 - Pythonmac-SIG@python.org >> <mailto:Pythonmac-SIG@python.org> >> 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> > > _______________________________________________ > Pythonmac-SIG maillist - Pythonmac-SIG@python.org > <mailto:Pythonmac-SIG@python.org> > 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>
_______________________________________________ Pythonmac-SIG maillist - Pythonmac-SIG@python.org https://mail.python.org/mailman/listinfo/pythonmac-sig unsubscribe: https://mail.python.org/mailman/options/Pythonmac-SIG
