struct _StoryElement_ {
char *title_of_chapter_;
struct _StoryElement_ *path_a_;
struct _StoryElement_ *path_b_;
char *content_of_chapter_;
};
typedef struct _StoryElement_ StoryElement;
因此,我創建了一個Tree,其中每個Structs都包含不同的值。我初始化它們都使用以下功能:使用指針訪問結構成員的垃圾數據
StoryElement *insertIntoStoryElement(StoryElement* root, char* title_of_chapter, char* content_of_chapter)
{
if(root == NULL)
{
root = makeNewStoryElement(root, title_of_chapter, content_of_chapter);
}
else if (root->path_a_ == NULL)
{
root->path_a_ = makeNewStoryElement(root, title_of_chapter, content_of_chapter);
}
else if (root->path_b_ == NULL)
{
root->path_b_ = makeNewStoryElement(root, title_of_chapter, content_of_chapter);
}
return root;
}
StoryElement *makeNewStoryElement(StoryElement* root, char* title_of_chapter,
char* content_of_chapter)
{
root = (StoryElement*) malloc(sizeof(StoryElement));
root->title_of_chapter_ =
(char*)malloc(sizeof(char*)*(strlen(title_of_chapter) + 1));
root->content_of_chapter_ =
(char*)malloc(sizeof(char*)*(strlen(title_of_chapter) + 1));
//strcpy(NewStoryElement->title_of_chapter_, title_of_chapter);
//strcpy(NewStoryElement->content_of_chapter_, content_of_chapter);
title_of_chapter = root->title_of_chapter_;
content_of_chapter = root->content_of_chapter_;
root->path_a_ = NULL;
root->path_b_ = NULL;
return root;
}
此功能就是爲我提供了我轉嫁給insertIntoStoryElement()的字符串值:
StoryElement *createStoryTree (StoryElement *root, char *storage)
{
char* pos = storage;
pos = strchr(pos, '\n');
*pos = '\0';
int size = strlen(storage);
char* title = malloc(size + 1);
strcpy(title, storage);
char* ptr_path_a = pos + 1;
pos = strchr(ptr_path_a, '\n');
*pos = '\0';
size = strlen(ptr_path_a);
char* path_a = malloc(size + 1);
strcpy(path_a, ptr_path_a);
char* ptr_path_b = pos + 1;
pos = strchr(ptr_path_b, '\n');
*pos = '\0';
size = strlen(ptr_path_b);
char* path_b = malloc(size + 1);
strcpy(path_b, ptr_path_b);
char* ptr_text = pos + 1;
pos = strchr(pos + 1, '\0');
*pos = '\0';
size = strlen(ptr_text);
char* text = malloc(size + 1);
strcpy(text, ptr_text);
root = insertIntoStoryElement(root, title, text);
/* if(strcmp(path_a, "-")!=0 && strcmp(path_b, "-")!=0)
{*/
root->path_a_ = readStoryFromFile(root->path_a_, path_a);
root->path_a_ = readStoryFromFile(root->path_b_, path_b);
//}
return root;
}
這是最終調用的函數主:
StoryElement *readStoryFromFile (StoryElement *root, char *filename)
{
if(strcmp(filename, "-") == 0)
{
//printf("End reached\n");
return 0;
}
FILE *file = fopen(filename, "r");
if(!file)
{
printf("[ERR] Could not read file %s.\n", filename);
return 0;
}
long fsize = getFileSize(file);
char* storage = malloc(fsize + 1);
if(!storage)
{
printf("[ERR] Out of memory.\n");
return 0;
}
fread(storage, fsize, 1, file);
storage[fsize] = '\0';
fclose(file);
root = createStoryTree(root, storage);
free(storage);
return root;
}
這是我的主要它使用另一種功能,僅高於2是相關的這個問題,我認爲:
int main (int argc, char *argv[])
{
if (argc != 2) /* argc should be 2 for correct execution */
{
printf("Usage: ./ass2 [file-name]\n");
return (1);
}
StoryElement *root = NULL;
root = readStoryFromFile(root, argv[1]);
if(!root)
return 3;
printf("%p\n", root);
printf("%s\n", root->title_of_chapter_);
//printStoryTree(root);
freeStoryTree(root);
root = NULL;
return 0;
}
最後我的問題是,2個printfs輸出後,在主函數返回以下內容: First pointer Address is ok I think, but the second printf should be "Kapitel_1.txt" 我爲什麼在這裏得到一個垃圾的價值?這是分段錯誤嗎?
由於錯誤發生在最令人意想不到的地方,我們希望看到'readStoryFromFile'並能夠跟着它,直到它返回(並打印錯誤的數據)。請提供。 –
不鼓勵在名稱中使用尾部下劃線,應該爲系統和庫保留。 –
爲什麼你註釋掉'makeNewStoryElement'中的兩個'strcpy'語句?事實上,現在它不會工作。 –