C#调用7z实现文件的压缩与解压

1.关于7z

首先在这里先介绍一下7z压缩软件，7z是一种主流的 压缩格式，它拥有极高的压缩比。在计算机科学中，7z是一种可以使用多种压缩算法进行数据压缩的档案格式。主要有以下特点：

• 来源且模块化的组件结构
• 最高的压缩比
• 强大的aes-256加密
• 可更改配置的压缩算法
• 支持操大文件
• 支持多线程压缩
• 具有多种压缩文件格式

2.解压缩实现代码

实现对文件的解压缩方法是通过cmd命令，调用7z程式通过cmd命令实现对文件进行解压和压缩的操作，具体实现代码如下：

• 压缩代码

压缩的cmd命令："7z a -tzip " + zippath + "  " + filepath;

public executionresult compressfile(string filepath, string zippath)//运行dos命令
        {
            executionresult exeres = new executionresult();
            exeres.status = true;
            try
            {
                process process = new process();
                process.startinfo.filename = "cmd.exe";
                string message = "";
                string command1 = "c:";
                string command2 = @"cd\";
                string command3 = @"cd c:\progra~1\7-zip";
                string command4 = "";


                command4 = "7z a -tzip " + zippath + "  " + filepath;

                process.startinfo.useshellexecute = false;
                process.startinfo.redirectstandardinput = true;
                process.startinfo.redirectstandardoutput = true;
                process.startinfo.redirectstandarderror = true;
                process.startinfo.createnowindow = true;
                process.start();
                process.standardinput.writeline(command1);
                process.standardinput.writeline(command2);
                process.standardinput.writeline(command3);
                process.standardinput.writeline(command4);
                process.standardinput.writeline("exit");
                message = process.standardoutput.readtoend(); //要等压缩完成后才可以来抓取这个压缩文件

                process.close();
                if (!message.contains("everything is ok"))
                {
                    exeres.status = false;
                    exeres.message = message;
                }
                else
                {
                    exeres.anything = zippath;
                }
            }
            catch (exception ex)
            {
                exeres.message = ex.message;
            }

            return exeres;
        }

 

• 解压代码

解压的cmd命令："7z x -tzip " + zippath + " -o" + filepath + " -y";

public executionresult decompressfile( string zippath, string filepath)//运行dos命令
        {
            executionresult exeres = new executionresult();
            exeres.status = true;
            try
            {
                process process = new process();
                process.startinfo.filename = "cmd.exe";
                string message = "";
                string command1 = "c:";
                string command2 = @"cd\";
                string command3 = @"cd c:\progra~1\7-zip";
                string command4 = "";


                command4 = "7z x -tzip " + zippath + " -o" + filepath + " -y";

                process.startinfo.useshellexecute = false;
                process.startinfo.redirectstandardinput = true;
                process.startinfo.redirectstandardoutput = true;
                process.startinfo.redirectstandarderror = true;
                process.startinfo.createnowindow = true;
                process.start();
                process.standardinput.writeline(command1);
                process.standardinput.writeline(command2);
                process.standardinput.writeline(command3);
                process.standardinput.writeline(command4);
                process.standardinput.writeline("exit");
                //process.waitforexit();
                message = process.standardoutput.readtoend();//要等压缩完成后才可以来抓取这个压缩文件

                process.close();
                if (!message.contains("everything is ok"))
                {
                    exeres.status = false;
                    exeres.message = message;
                }
                else
                {
                    exeres.anything = filepath;
                }
            }
            catch (exception ex)
            {
                exeres.message = ex.message;
            }

            return exeres;
        }