从Objective C调用C ++ [英] From Objective C call C++

问题描述

我有问题调用c ++中的一些函数从objective-c。
我有以下代码。在objCFuncA如何调用funcBCallback（std :: string inText）函数？感谢

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
$ b

SampleCallback_iOS.h

@interface SampleCallback_iOS : NSObject

+ (SampleCallback_iOS*)shared;

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

@end

SampleCallback_iOS.m / p>

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

推荐答案

它不可能从纯粹的Objective-C调用C ++函数（就像你不能从纯C调用C ++）。

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

你可以将你的Objective-C文件转换为Objective -C ++，但。要这样做，只需重命名文件以使用扩展名 .mm 而不是 .m 。

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.

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