[英]C malloc array of structs of strings
I'm trying to create an array of structs (of arrays) and am a bit unsure of the malloc required. 我正在尝试创建一个结构数组(数组),并且我不太确定所需的malloc。 First I define my struct,
首先我定义我的结构,
typedef struct {
char *str1, *str2, *str3, *str4;
} player;
Then in main I need to initialize the structure, and malloc the strings inside of it, 然后在main中我需要初始化结构,并将malloc内部的字符串,
player1 player;
player1.str1 = malloc(100);
// and the rest
But this is just for one structure. 但这仅适用于一种结构。 How do I malloc an array of these structures?
我如何malloc这些结构的数组? Do I need to have a for loop and create N instances of the struct?
我是否需要一个for循环并创建结构的N个实例?
I'm guessing there's a line that's something like 我猜这里有一条线
playerArray* = malloc(N * sizeof(player))
The end goal is to have something I can access using, say, 最终目标是让我可以使用的东西,例如,
printf("%s\n", playerArray[i].str1)
After I've read stuff into it. 在我读完之后。 Thanks.
谢谢。
Yes, you need to loop and allocate the strings for each instance of the struct. 是的,您需要循环并为结构的每个实例分配字符串。 I suggest you create a function that looks something like this:
我建议你创建一个看起来像这样的函数:
#define PLAYER_STR_LENGTH 100
typedef struct {
char* str1, str2, str3;
// ...
} player;
player* create_player() {
player* p = malloc(sizeof(player));
if (p == NULL) {
// out of memory, exit
}
p->str1 = malloc(PLAYER_STR_LENGTH);
if (p->str1 == NULL) {
// out of memory, exit
}
// allocate more stuff...
return p;
}
It is also a good idea to make a matching function free_player
to clean up afterwards. 最后制作一个匹配函数
free_player
来清理它也是一个好主意。 You could also pass parameters to the create_player()
function if you want to set values at the time of allocation. 如果要在分配时设置值,也可以将参数传递给
create_player()
函数。
To make an array of players, simply create an array of player pointers and then loop over it and allocate each player struct like so: 要创建一个玩家数组,只需创建一个玩家指针数组,然后循环它并分配每个玩家结构,如下所示:
player** players = malloc(N * sizeof(player*));
for(int n = 0; n < N; n++)
players[n] = create_player();
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