再问C++转C的有关问题

再问C++转C的问题
C++语句如下:
unsigned   char   **   buffer;

buffer   =   new   unsigned   char   *   [height];
buffer[0]   =   new   unsigned   char[height   *   width];

上述两个转成纯C应怎样写,有点不太清楚其区别,哪位在虾帮忙指点一下.
昨天的给的还是不行.
unsigned   char   **   buffer;

buffer   =   (   unsigend   char   **)malloc(sizeof(unsigend   char*)   *   height   );
buffer[0]   =   (   unsigend   char   *)malloc(sizeof(unsigend   char)   *   height   *   width   );

上述能编译过,但应用起来取值不对.

[解决办法]
unsigned char ** buffer;

buffer = ( unsigend char **)malloc(sizeof(unsigend char*) * height );
*buffer[0] = ( unsigend char *)malloc(sizeof(unsigend char) * height * width );