1e41f4b71Sopenharmony_ci# SharedBuffer 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci## 概述 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ci共享内存数据的结构体。 7e41f4b71Sopenharmony_ci 8e41f4b71Sopenharmony_ci**起始版本：** 3.2 9e41f4b71Sopenharmony_ci 10e41f4b71Sopenharmony_ci**相关模块：**[NNRt](_n_n_rt_v20.md) 11e41f4b71Sopenharmony_ci 12e41f4b71Sopenharmony_ci 13e41f4b71Sopenharmony_ci## 汇总 14e41f4b71Sopenharmony_ci 15e41f4b71Sopenharmony_ci 16e41f4b71Sopenharmony_ci### Public 属性 17e41f4b71Sopenharmony_ci 18e41f4b71Sopenharmony_ci| 名称 | 描述 | 19e41f4b71Sopenharmony_ci| -------- | -------- | 20e41f4b71Sopenharmony_ci| FileDescriptor [fd](#fd) | 共享内存的文件描述符 | 21e41f4b71Sopenharmony_ci| unsigned int [bufferSize](#buffersize) | 共享内存的空间大小，单位字节 | 22e41f4b71Sopenharmony_ci| unsigned int [offset](#offset) | 有效数据起始地址在共享内存中的偏移 | 23e41f4b71Sopenharmony_ci| unsigned int [dataSize](#datasize) | 有效数据的占用空间大小，单位字节 | 24e41f4b71Sopenharmony_ci 25e41f4b71Sopenharmony_ci 26e41f4b71Sopenharmony_ci## 类成员变量说明 27e41f4b71Sopenharmony_ci 28e41f4b71Sopenharmony_ci 29e41f4b71Sopenharmony_ci### bufferSize 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ci``` 32e41f4b71Sopenharmony_ciunsigned int SharedBuffer::bufferSize 33e41f4b71Sopenharmony_ci``` 34e41f4b71Sopenharmony_ci**描述** 35e41f4b71Sopenharmony_ci 36e41f4b71Sopenharmony_ci共享内存的空间大小，单位字节 37e41f4b71Sopenharmony_ci 38e41f4b71Sopenharmony_ci 39e41f4b71Sopenharmony_ci### dataSize 40e41f4b71Sopenharmony_ci 41e41f4b71Sopenharmony_ci``` 42e41f4b71Sopenharmony_ciunsigned int SharedBuffer::dataSize 43e41f4b71Sopenharmony_ci``` 44e41f4b71Sopenharmony_ci**描述** 45e41f4b71Sopenharmony_ci 46e41f4b71Sopenharmony_ci有效数据的占用空间大小，单位字节 47e41f4b71Sopenharmony_ci 48e41f4b71Sopenharmony_ci 49e41f4b71Sopenharmony_ci### fd 50e41f4b71Sopenharmony_ci 51e41f4b71Sopenharmony_ci``` 52e41f4b71Sopenharmony_ciFileDescriptor SharedBuffer::fd 53e41f4b71Sopenharmony_ci``` 54e41f4b71Sopenharmony_ci**描述** 55e41f4b71Sopenharmony_ci 56e41f4b71Sopenharmony_ci共享内存的文件描述符 57e41f4b71Sopenharmony_ci 58e41f4b71Sopenharmony_ci 59e41f4b71Sopenharmony_ci### offset 60e41f4b71Sopenharmony_ci 61e41f4b71Sopenharmony_ci``` 62e41f4b71Sopenharmony_ciunsigned int SharedBuffer::offset 63e41f4b71Sopenharmony_ci``` 64e41f4b71Sopenharmony_ci**描述** 65e41f4b71Sopenharmony_ci 66e41f4b71Sopenharmony_ci有效数据起始地址在共享内存中的偏移 67