c - ssh 中不兼容指针类型的赋值

Question

我需要你的帮助..我构建了 3 个结构:歌曲、歌曲列表和音乐专辑。

我在 ssh 中收到消息警告:“来自不兼容指针类型的分配”根据我在旁边写的两行://问题

typedef struct   
{

    char* nameSong;
    char* nameSinger;
    int lenghtOfSong;
    struct song *next;
    struct song *prev;

} song;

typedef struct
{

    song* head;
    song* tail;

} listOfsong;

typedef struct
{

    int yearOfpublication;
    listOfsong* listOfSongs;
    int numbersOfSongs;

} musicAlbum;

song* SongCreate()
{

    song *songInput =(song*) malloc(sizeof(song));
    //free
    songInput->nameSong = StringName();
    songInput->nameSinger = StringName();
    scanf("%d", &songInput->lenghtOfSong);
    songInput->next = NULL;
    songInput->prev = NULL;
    return songInput;

}

void AddSongToList(musicAlbum *pmusicAlbum)
{

    if (pmusicAlbum->listOfSongs == NULL)
    {
        pmusicAlbum->listOfSongs = (listOfsong*)malloc(sizeof(listOfsong));
        song *newSong=SongCreate();
        pmusicAlbum->listOfSongs->head = newSong;
        pmusicAlbum->listOfSongs->tail = newSong;
    }
    else
    {
        song *newSong = SongCreate();
        newSong->prev = pmusicAlbum->listOfSongs->tail;// problem
        pmusicAlbum->listOfSongs->tail->next = newSong; // problem
        pmusicAlbum->listOfSongs->tail = newSong;
    }

}

谁知道这是什么意思？它出现在我的项目的其他地方

谢谢。

Answer 1

改变这个

typedef struct   
{
    char* nameSong;
    char* nameSinger;
    int lenghtOfSong;
    struct song *next;
    struct song *prev;
} song;

至

typedef struct song song;

struct song
{
    char* nameSong;
    char* nameSinger;
    int lenghtOfSong;
    struct song *next;
    struct song *prev;
};