This a custom tree control that tries to solve the problem of vertical display of hierarchical data.

读取powerdesigner的PDM文件，分析pdm的文件结构，读取数据包、表、列、行、主键等属性信息，构建分级树。-Read powerdesigner the PDM file analysis pdm file structure, read packets, tables, columns, rows, primary keys and other attribute information, build hierarchical tree.

判断二叉树，先判断元素个数与高度是不是符合完全二叉树的规律，不符合则FALSE。 之后按层次遍历的方法，不同的是遇到NULL也放入，出队时，遇到第一个NULL跳出。 如果之后出队的全是NULL，则是完全二叉树，否则不是。-Judgment tree, first determine the number of elements with a high degree of complete binary tree is not in line with the law, does not

设二叉树结点值为大写字母，输入二叉树的前序遍历和中序遍历序列，生成此二叉树，输出该二叉树的后序遍历和按层次遍历序列。输入某结点值，在二叉树中查找该结点，若该结点存在，则输出从根到该结点的路径，否则给出不存在信息。 -Binary tree node is set in capital letters, enter the pre-order traversal of a binary tree traversal sequence and generates this binary tree