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。-Based on the unzip32.dll dynamic link library, call the Info-ZIP function of Wiz_UnzipToMemory as an example, discussed in detail in the VB Wiz_UnzipToMemory function to use the correct transfer user-defined type parameter in the VB method, using the pointer read user type UzpBuffer parameter variable retstr member of the Buffer content in the VB method, release the memory method.