mac平台获取app路径

#import <Foundation/Foundation.h>  
#include <mach-o/dyld.h>  
#include <string.h>  
  
std::string GetExeDir()  
{  
    char buf[0];  
    uint32_t size = 0;  
    int res = _NSGetExecutablePath(buf,&size);  
      
    char* path = (char*)malloc(size+1);  
    path[size] = 0;  
    res = _NSGetExecutablePath(path,&size);  
      
    char* p = strrchr(path, '/');  
    *p = 0;  
    std::string pathTemp;  
    pathTemp.append(path);  
    free(path);  
    return pathTemp;  
}