我想在为输入文件分配多少内存的同时为结构数组(struct)分配内存。我不确定最明智的做法是什么。我的结构:为fgets中的结构数组分配内存
typedef struct sNaryNode {
void* data; // point to each nodes data
unsigned int n; // the number of children
struct sNaryNode **child; // the child list
} NaryNode;
typedef struct {
char *name;
unsigned int utility; // -1, 0, 1
unsigned int probability; // 0-1
} Child;
typedef struct {
unsigned int level;
unsigned int player;
unsigned int nChildren;
Child *children; // The array of structs I am trying to allocate memory to.
} Data;
我曾尝试以下:
void readData(Data *node) {
FILE *input_file = fopen("data.csv", "r");
if(input_file == NULL) printf("Could not open file\n");
else {
char buf[80];
int n = 0;
while(fgets(buf, 80, input_file)!= NULL) {
// allocate space for new data
Data *node = (Data*)calloc(1, sizeof(Data));
sscanf(buf, " %u, %u, %u, ", &node->level, &node->player, &node->nChildren);
node->children = calloc(node->nChildren, sizeof *node->children);
sscanf(buf, "%u, %u, %s ", &node->children[n].utility, &node->children[n].probability, node->children[n].name);
n++;
}
fclose(input_file);
}
}
int main(void) {
Data *node;
readData(node);
}
这导致分段错误,我希望有事情做与错误的内存分配。
文件我读:
level, player, nChildren, utility, probability, name
1, 1, 2, 1 0, 0.50 0.50, "Kom med det første tilbud (anchor)" "Afvent modspilleren kommer med første tilbud"
2, 2, 2, 1 0, 0.50 0.50, "Kom med lavt modtilbud (anchor)"
2, 2, 2, 1 0, 0.50 0.50, "Kom med det første tilbud "anchor"
编辑:GDB告诉我,该段错误是从READDATA第二sscanf的陆续上马。仍然不确定是什么造成的。
不要改变你的问题的方式,使已经给出的答案不可理解......: -/ – alk