Question

I have a lot of shared C++ code that I’d like to use in my iPhone app. I added the .cpp and .h files to my Xcode project and used the classes in my Objective-C++ code. The project compiles fine with 0 errors or warnings.

However, when I run it in the simulator I get the following error when I attempt to access an STL method in my objective-c code (such as .c_str()):

Program received signal:  “EXC_BAD_ACCESS”.

Unable to disassemble std::string::c_str.

Here’s an example of the code that causes the error:

[name setText:[[NSString alloc] initWithCString:myCPlusPlusObject->cppname.c_str()]];

where name is an NSTextField object and cppname is a std::string member of myCPlusPlusObject.

Am I going about this the right way? Is there a better way to use STL-laden C++ classes in Objective-C++? I would like to keep the common C++ files untouched if possible, to avoid having to maintain the code in two places.

Thanks in advance!

Answer 1

Make sure the string isn’t empty before passing it to the initWithCString function.

Also the function you’re using has been deprecated, use this one instead.