[問題] 關於指標陣列取位址
我這邊想使用指標陣列來模擬出資料結構的效果
例如我給定兩陣列
char *dir[2], *page1[2], *page2[2],
entry1[] = {"hello"}, entry2[] = {"world"};
entry3[] = {"hello"}, entry4[] = {"world"};
然後再建立指標陣列的連結關係
dir[0] = page1;
page1[0] = entry1;
page1[1] = entry2;
dir[1] = page2;
page2[0] = entry3;
page2[1] = entry4;
接著我再給一指標
char *ptr = dir;
之後就單用ptr來去存取到entry1, entry2, entry3, 與entry4的內容
不過這邊有一個小問題
當我的ptr要取出dir[0]中的記憶體位址回存至ptr中
讓指標指向page1的記憶體位址OB
會有型態不同的問題
勢必我一定要將程式轉型成改寫成 ptr = (unsigned char *)*ptr;
才能讓指標指向到page1的記憶體
目前以我的情況一定要用到型態轉型
才能達到單一指標指向到任一的entry上嗎??
謝謝!
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