在Objective-C应用中使用C ++库？

Question

I am planning on learning Objective-C to write an OS X application but it will depend on a library written in C++. Can I interface with C++ in an Objective-C app? I'm new to desktop development.

The C++ library will be used simply to analyze a file and return some data about that file. For example, in the libraries compiled example, in terminal you'd type

./xlsanalysis my_spreadsheet.xls

and it returns:

rows: 34
columns: 10
first row: "My Spreadsheet header"

Can I include this library directly into the Objective-C app or interface with it some how?

Answer 1

For this purpose, there is Objective-C++, eg Objective-C plus C++ (or vice versa). From Objective-C++ files (eg .mm files), you have full access to all C++ functionality. Be careful when casting types from C++ to Objective-C, eg you should convert a C++ string to a NSString by using something like [NSString stringWithCString:cPlusPlusString.c_str()] The other direction would be string cPlusPlusString([objectiveCString cString]) (or cStringUsingEncoding: ).

Answer 2

Yes, you'll just need to switch any Obj-C files that include (directly or indirectly) C++ content into objective-c++. Basically that just means changing the extension to .mm -- this will give you the ability to use C++ and Obj-C together in those files.

Answer 3

Objective-C++.

http://www.google.com/search?q=%22objective-c%2B%2B%22 How well is Objective-C++ supported? There is really something like Objective C++? How much of C++ is supported in Objective-C++