Question

我想从c。

中的结构返回一个字符数组，一个整数数组

我的数据结构如下：

struct character_frequency
{
        char *characters;
        int *frequency;
};

struct character_frequency collect_character_distribution(char *buffer, long lSize);

struct character_frequency collect_character_distribution(char *buffer, long lSize)
{
        printf("Collecting character distribution...\n");
        char distribution[256][2];
        char *characters;
        int *frequency;
        long for_a;
        int for_b;
        struct character_frequency resultx;

        for (for_a = 0; for_a < lSize; for_a++)
        {
                distribution[(int)buffer[for_a]][0] = (char) buffer[for_a];
                distribution[(int)buffer[for_a]][1]++;
        }

        int cntr = 0;
        for (for_b = 0; for_b < 256; for_b++)
        {
                if (distribution[for_b][1] > 0)
                {
                        characters[cntr] = distribution[for_b][0];
                        frequency[cntr] = distribution[for_b][1];
                }
        }        

        resultx.characters = (char *) characters;
        resultx.frequency = (int *) frequency;

        return resultx;
}

我的主要功能如下：

int main()
{
        char *buffer;
        long lSize;
        char *characters;
        int *frequency;
        struct Bar result = funct();
        buffer = result.x;
        lSize = result.y;
        struct character_frequency characterFrequency = collect_character_distribution(buffer, lSize);
        characters = characterFrequency.characters;
        frequency = characterFrequency.frequency;
        printf("%s\n", characters);
        //printf("%s\n", (char *) frequency);
        //collect_character_distribution(buffer, lSize);

        return 0;
}

我基本上想从结构函数返回多个值。首先，我在结构中定义它们，在函数步骤之后，我想从结构函数中获取字符数组和整数数组。

我测试了Struct Bar result函数，它运行得很好。唯一的问题是collect_character_array结构函数。

我得到分段错误错误。

我该如何解决问题？

Answer 1

在您的函数中，您声明char *characters;和int *frequency;，它们是指针。然后在for_b循环中索引这些数组。但是你从来没有为这些阵列分配空间。

定义未定义数组并从c中返回结构时出现分段错误错误

1 个答案: