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golang小项目-文件打包

发布时间：2022-01-14 编辑：jiaochengji.com

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<h3>文件打包</h3> <ul><li>准备</li><li>需求</li><li>功能模块</li><li>流程图</li><li>数据结构</li><li><ul><li>结构体</li><li>函数</li></ul></li><li>特殊函数</li><li><ul><li>通过首地址指针获取结构体数据</li><li>数组越界异常处理</li></ul></li></ul>

<h1>准备</h1> <ul><li>开发语言：GOLANG</li><li>开发工具：LiteIDE</li><li>开发环境：Windows</li><li>运行环境：Linux32</li></ul><h1>需求</h1> <pre><code>将抓拍机拍摄照片和记录信息json文件合成为一个文件： 1.通过内置Linux系统输入命令行提取参数进行打包； -i 目标源文件夹 -o 打包程序文件名 2.解析json中数据进行类型转换，重新编码； 3.在pkg中按字节首先存放json数据，再依次存入png文件二进制数据。 </code></pre> <h1>功能模块</h1> <pre><code>1.获取命令行指令； 2.解析json中数据，存入结构体； 3.类型和编码转换； 4.pkg数据写入。 </code></pre> <h1>流程图</h1>

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从指令行获取来源地址和目标文件

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从json中都去配置信息

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将json文件中数据依次存放如与C#对应的结构体中

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创建pkg文件

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写入pkg文件

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一次拷贝图片二进制数据放入pkg中

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<h1>数据结构</h1> <h2>结构体</h2> <table><thead><tr><th>结构体字段</th><th>作用</th></tr></thead><tbody><tr><td>SnapFileAttrStruct</td><td>存放字节数据</td></tr><tr><td>device</td><td>设备信息</td></tr><tr><td>info</td><td>道路信息</td></tr><tr><td>xSXX</td><td>限速模式</td></tr><tr><td>record</td><td>记录信息</td></tr><tr><td>imgDatetime</td><td>图片时间信息</td></tr></tbody></table><h2>函数</h2> <table><thead><tr><th>函数名称</th><th>函数参数</th><th>函数返回值</th><th>函数用途</th></tr></thead><tbody><tr><td>main</td><td/><td/><td/></tr><tr><td>readConfig</td><td>fileName string</td><td>v caseJson , err error</td><td>从接送文件中读取数据存入caseJson结构体中</td></tr><tr><td>stringToUint8</td><td>s string</td><td>u uint8</td><td>string类型转换为uint8</td></tr><tr><td>intToString</td><td>i int</td><td>s string</td><td>int类型转换为string</td></tr><tr><td>memcpy</td><td>dst []byte, str string</td><td/><td>string赋值给字节数组</td></tr><tr><td>memcpyTime</td><td>dst []byte, src [8]byte, i int</td><td/><td>8字节数组赋值给字节数组</td></tr><tr><td>memcpyByte</td><td>dst , src []byte</td><td/><td>字节数组赋值给字节数组</td></tr><tr><td>timeTransfer</td><td>timestr string</td><td>datetime [8]uint8</td><td>将时间字符串转换为8字节数组-用于图片时间、有效时间</td></tr><tr><td>copyFile</td><td>dest src * os.File , offset int64</td><td/><td>将图片二进制数据复制到pkg文件中</td></tr><tr><td>handleCommandLine</td><td>r1 , r2 string</td><td/><td>获取命令行参数</td></tr><tr><td>UTF8ToGBK</td><td>s []byte</td><td>[]byte</td><td>UTF转换为GBK</td></tr></tbody></table><h1>特殊函数</h1> <h2>通过首地址指针获取结构体数据</h2> <pre><code>import ( "unsafe" ) dataBytes := (*[长度]byte)(unsafe.Pointer(&snap)) </code></pre> <h2>数组越界异常处理</h2> <pre><code>func memcpyByte( dst , src []byte) { defer func(){ recover() }() size := len(src) for i := 0 ; i < size ;i { dst[i] = src[i] } } </code></pre>

<blockquote class="layui-elem-quote" style="width: 100%;overflow:hidden"> 作者： BRINY_CC
链接： https://blog.csdn.net/BRINY_CC/article/details/103489873
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
</blockquote>

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