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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