动态多维数组 [英] Dynamic Multidimensional array

问题描述

我需要的字符的多维数组，它是动态的，只有一维...

我必须存储的一对串为10（或更少）的长度的字符的每个，但与成对的可变数目

I need a multidimensional array of chars that is dynamic in only one dimension...
I have to store a pair of strings with a length of 10 (or less) chars each, but with a variable number of "pairs".

我的想法是这样的。

char (*instrucao)[2][10];

这给了我一个指向字符的2×10阵列，但是当我做这样的事情这是不正常工作：

Which gives me a pointer to a 2x10 array of chars, but this is not working properly when i do something like this:

char strInstrucoes[117], *conjunto = calloc(21, sizeof(char));
instrucao = calloc(1, sizeof(char[2][10]));
conjunto = strtok(strInstrucoes,"() ");
for(i = 0; conjunto != NULL; i++){
    realloc(instrucao, i+1*sizeof(char[2][10]));
    sscanf(conjunto,"%[^,],%s", instrucao[i][0], instrucao[i][1]);
    printf("%s | %s\n", instrucao[i][0], instrucao[i][1]);
    conjunto = strtok(NULL, "() ");
}

有 strInstrucoes 为（ABC，123）（高清，456）（GHI，789），我不3线2对，每对这样的'T矩阵：

Having strInstrucoes as (abc,123) (def,456) (g789), I don't matrix with 3 lines of 2 pairs each like this:

abc | 123
def | 456
ghi | 789

而是这是我收到：

but instead this is what I'm getting:

abc | 123
def | 45def | 45de
ghi | 789

什么是做到这一点的正确方法？
谢谢！

What's the right way to do this? Thanks!

推荐答案

您应该分配指针的新地址的realloc 返回

You should assign the pointer the new address realloc returns

instrucao = realloc(instrucao, (i+1)*sizeof(char[2][10]));

请注意，对于错误检查，你可能希望分配到一个新的指针和检查 NULL 。还要注意括号 - 你基本上只是添加 的我，而不是所要求的大小相乘。容易监督。

Note that for error checking, you may desire to assign to a new pointer and check for NULL. Also note the parens - you basically just added i instead of multiplying with the required size. Easily overseen.

请注意，没有必要在初始释放calloc 。只是初始化 instrucao 到 NULL 和realloc会像的malloc 当第一次通过了一个空指针。

Note that there is no need for the initial calloc. Just initialize instrucao to NULL, and realloc will behave like malloc when first passed a null pointer.

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