windows下实现编码转换的类

每个函数的输入的第一个参数是目的字符串指针的引用，

第二个参数是源字符串（要转换字符串）指针的引用.

要求目的字符串指针指向NULL，在转换函数中根据

源字符串长度分配地址空间给目的字符串。

在目的字符串生存周期结束后，调用者必须自行释放地址空间，

否则会出现内存泄漏。-windows under the category of data conversion functions for each input parameter is the first purpose of the quoted string pointer, the second parameter is the source string (the string to convert) reference guide. asked the purpose of the string pointer to NULL, transfer function in the source string according to the length of the distribution of address space for the purpose of the string. In the destination life cycle after the end of the string, the caller must release its own address space, otherwise there will be a memory leak.