c的注意事项

注意事项

oc 调用 c c++ 需要注意的地方

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#ifndef LearnC_h
#define LearnC_h
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
void learnCplus(int a, int b);
    
#ifdef __cplusplus
}
#endif
#endif /* LearnC_h */

hpp

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#ifndef LearnC___hpp
#define LearnC___hpp
#include <string>
#include <stdio.h>
void learnCplusplus(int a, int b);
class cppObject
{
public:
    void exampleMethod(const std::string& str);
};
#endif /* LearnC___hpp */

cpp

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//
//  LearnC++.cpp
//  LearnOCandCandC++
//
//  Created by 林伟池 on 16/2/23.
//  Copyright © 2016年 林伟池. All rights reserved.
//
#include "LearnC++.hpp"
#include <iostream>
void learnCplusplus(int a, int b) {
    printf("cplusplus%d\n", a + b);
}
void cppObject::exampleMethod(const std::string &str)
{
    std::cout << str;
}
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#import "LearnC.h"
#import "LearnC++.hpp"
#import "LearnOCinCPP.h"
@interface ViewController ()
@end
@implementation ViewController
{
    cppObject* object;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    learnCplus(1, 2); //在OC中使用c
    
    learnCplusplus(1, 2); //在OC中用C++编译的C
    
    //在OC中使用C++的类
    object = new cppObject();
    NSString* str = @"GAO高级\n";
    std::string cpp_str([str UTF8String], [str lengthOfBytesUsingEncoding:NSUTF8StringEncoding]);
    object->exampleMethod(cpp_str);
    delete object;
    object = NULL; //记得删除
    
    
    //在OC使用的C++类中 使用OC
    LY::OCinCPP* cpp = new LY::OCinCPP();
    cpp->lyRun();
    
}

参考