From Objective C call C++

Question

i have problem with calling some function in c++ from objective-c. I have the following code. In "objCFuncA" how do i call "funcBCallback(std::string inText)" function?. Thanks

SampleCallback.h

class SampleCallback
{
public:
    static void funcA();
    static void funcBCallback(std::string inText);
};

SampleCallback.mm

void SampleCallback::funcA()
{
    [[SampleCallback_iOS shared] objCFuncA:"My text from C++"];
}

void SampleCallback::funcBCallback(std::string inText)
{
    NSLog(@"SUCCES GET RETURN");
}

SampleCallback_iOS.h

@interface SampleCallback_iOS : NSObject

+ (SampleCallback_iOS*)shared;

- (void)objCFuncA:(const char*)inString;

@end

SampleCallback_iOS.m

@implementation SampleCallback_iOS

static SampleCallback_iOS* instance = nil;

+ (SampleCallback_iOS*)shared
{
    @synchronized(self) {
        if (instance == nil) {
            instance = [[self alloc] init];
        }
    }
    return instance;
}

- (void)objCFuncA:(const char*)inString
{
    NSLog(@"Text from C++: %s", inString);

    // How to call SampleCallback::funcBCallback?
}
@end

You have to rename the SampleCallback_iOS.m to .mm and use #include"SampleCallback.h", After that is just as simple as SampleCallback::funcBCallback("your text"); — Jose Palma
– Jose Palma, Commented Apr 20, 2015 at 12:04

Nikolai Ruhe · Accepted Answer · 2015-04-20 19:48:08Z

1

It's not possible to call C++ functions from plain Objective-C (like you can't call C++ from plain C).

You can convert your Objective-C file to Objective-C++, though. To do so, just rename the file to use the extension .mm instead of .m.

edited Apr 20, 2015 at 19:48

answered Apr 20, 2015 at 12:10

Nikolai Ruhe

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