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  • C++retrieve array via returned pointer,traverse the array pointer without the array size

    char **arrayP6();
    void retrieveUuid(char *uuidValue);
    void array8();
    
    int main()
    {
        array8();
        return 0;
    }
    
    void array8()
    {
        char **p=arrayP6();
        for(int i=0;i<100;i++)
        {
            printf("Index=%d,value=%s in array8()\n",i,*(p+i));
        }
    }
    
    char **arrayP6()
    {
        static char *arr[100]; 
        for(int i=0;i<100;i++)
        {
            arr[i]=(char*)malloc(40);
            retrieveUuid(arr[i]);
        }
        char **p=arr;
        return p;
    }

    Part II

    When I try to traverse the array via pointer, but I don't know its size exactly. So I use the while loop and pointer self-increment method.

    char **arrayP6();
    void retrieveUuid(char *uuidValue);
    void array8();
    
    int main()
    {
        array8();
        return 0;
    }
    
    void array8()
    {
        char **p=arrayP6();
        int num=0;
        while(*p)
        {
            printf("Index=%d,value=%s in array8()\n",++num,*p);
            *p++;
        } 
    }
    
    char **arrayP6()
    {
        static char *arr[100]; 
        for(int i=0;i<100;i++)
        {
            arr[i]=(char*)malloc(40);
            retrieveUuid(arr[i]);
        }
        char **p=arr;
        return p;
    }
    
    void retrieveUuid(char *uuidValue)
    {
        uuid_t newUUID;
        uuid_generate(newUUID);
        uuid_unparse(newUUID,uuidValue);
    }

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  • 原文地址:https://www.cnblogs.com/Fred1987/p/15648564.html
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