说明：  本文以调用Info-ZIP公司的unzip32.dll动态连接库中的函数Wiz_UnzipToMemory为例，详细讨论了在VB中使用Wiz_UnzipToMemory函数时正确传递用户自定义类型参数的方法、在VB中使用指针读取用户自定义类型UzpBuffer参数变量retstr的成员Buffer内容的方法、在VB中释放内存的方法。
(This paper calls Info-ZIP company unzip32.dll dynamic link library function Wiz_UnzipToMemory as an example, discussed in detail the use of Wiz_UnzipToMemory function in VB correctly passed user-defined type parameter method, the use of a pointer to read the user in VB Define the type UzpBuffer parameters Variables members of the retstr Buffer content methods, the release of memory in VB.)