[Interest] iOS Objective-C callback block example connecting back to iOS Qt app?

[Ben Lau]

Hi Edward,

You may find example code from my project.

quickios/qisystemutils.mm at master · benlau/quickios
<https://github.com/benlau/quickios/blob/master/qisystemutils.mm>

It has implemented an interface to create and communicate to UIAlertView ,
UIActionSheet , UIImagePickerController etc. It uses a singleton object
called SystemMessenger as the bridge between C++ and Objective-C++ code. So
that the developed code can be run on non-iOS platform too  (for
development use)


On 15 May 2015 at 05:53, Edward Sutton <edward.sutton at subsite.com> wrote:

> Can anyone share an example on how to implement the asynchronous return of
> a result from an Objective-C callback block to Qt?
>
> For example, see the “successBlock:” below which gets called back
> asynchronously.
>
>     self.PDFCreator = [NDHTMLtoPDF createPDFWithHTML:(NSString*)html
>                                              baseURL:(NSURL*)baseUrl
>
> pathForPDF:[@"~/Documents/hello-world.pdf" stringByExpandingTildeInPath]
>                                             pageSize:kPaperSizeA4
> margins:UIEdgeInsetsMake(10, 5, 10, 5)
>     successBlock:^(NDHTMLtoPDF *htmlToPDF) {
>
>         NSString *result = [NSString stringWithFormat:@"HTMLtoPDF did
> succeed (%@ / %@)", htmlToPDF, htmlToPDF.PDFpath];
>         NSLog(@"%@",result);
>         self.resultLabel.text = result;
>
>     }
>     errorBlock:^(NDHTMLtoPDF *htmlToPDF) {
>         NSString *result = [NSString stringWithFormat:@"HTMLtoPDF did
> fail (%@)", htmlToPDF];
>         NSLog(@"%@",result);
>         self.resultLabel.text = result;
>     }];
>
>
> Background:
> ————————
>
> I need to implement native iOS code to replace the missing QPrinter
> functionality I used to convert HTML to a PDF report on Android, OS X,
> Linux, and Windows.
>
> Unfortunately the Qt html-to-pdf functionality is implemented in
> QPrinter.  This functionality is gone from Qt iOS since iOS has no printer
> device support,  even though I am not accessing a printer device from iOS.
>
> I found this project which seems to work:
>
>         https://github.com/iclems/iOS-htmltopdf
>
> Objective-C interfacing to C++ is challenging.
>
> Thanks in advance for any tips,
>
> -Ed
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