QTableWidget大数据文件 文件映射mmap
QTableWidget大数据文件显示 文件映射mmap
如果文件很大，读取全部的数据会占用很大内存，推荐文件映射的方法，每次交互只读需要显示的文件数据。文件映射1G左右的文件，大概在1.2s左右可以完成文件映射；再进行分页显示，表格固定的是一百行，每次操作对这一百行数据进行刷新，虚拟出完整表格的效果。
测试：QTableWidge分页显示1千万行数据，建立mmap文件映射，只读取需要显示的部分文件内容，此种方式速度快，占用内存小，内存占用149MB左右，每次只读取显示部分的数据，推荐此种方式。
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本站所有资源不代表本站的观点或立场，基于网友分享，根据中国法律《信息网络传播权保护条例》第二十二条之规定，若资源存在侵权或相关问题请联系本站客服人员，zhiweidada#qq.com，请把#换成@，本站将给予最大的支持与配合，做到及时反馈和处理。关于更多版权及免责申明参见 版权及免责申明