如何用malloc创建一个动态的结构体二维数组

Question

struct {
        unsigned char b;
        unsigned char g;
        unsigned char r;
    }pRBG[1024][1024];

如上，我需要创建一个1024*1024的结构体二位数组，但是超过了内存上限，得动态分配内存，我想用malloc来实现，但不知道具体代码怎么写，求大佬帮忙解惑

Answer 1

#define DEFAULT_ROW_COUNT       1024
    #define DEFAULT_COLUMN_COUNT    1024

    struct RBG {
        unsigned char b;
        unsigned char g;
        unsigned char r;
    };

    RBG** pData = (RBG**)malloc(sizeof(RBG*) * DEFAULT_ROW_COUNT);

    for (size_t i = 0; i != DEFAULT_ROW_COUNT; ++i)
    {
        pData[i] = (RBG*)malloc(sizeof(RBG) * DEFAULT_COLUMN_COUNT);
    }


    // Delete
    for (size_t i = 0; i != DEFAULT_ROW_COUNT; ++i)
    {
        free(pData[i]);
    }

    free(pData);