vb.net进行文件压缩

如果机器安装有winRar软件，就可以通过shell来借用他的功能达到压缩文件的效果；

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参考代码如下：

Dim DeliveryF As String = Server.MapPath("..\Temp\DeliveryFactors.xls") '原始文件 (压缩前)

Dim TruckInfo As String = Server.MapPath("..\Temp\TruckInformation.xls")

Dim QDetail As String = Server.MapPath("..\Temp\QuotationDetail.xls")

'用shell命令调用winrar.exe创建压缩文件()

Dim winRarexe As String = "C:\Program Files\WinRAR\Rar" 'winzip 执行文件的位置

Dim wtarget As String = "C:\temp\QuotationVAComparsion.zip" '目地文件 (压缩后)

Dim command As String = winRarexe " a " wtarget " " DeliveryF " " TruckInfo " " QDetail

'这个命令你可以查看winrar的命令集

Dim retval As Double 'Shell 指令传回值

retval = Shell(command, AppWinStyle.MinimizedFocus)

用vb.net对sql多数据库压缩备份为一个文件

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Text;

using _5dRss.Const;

using _5dRss.lib.Data.Tool;

public partial class admin_admin_dbmanage : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

//生成备份文件列表

ListBackupFiles();

if (!Page.IsPostBack)

{

Showmsg.Visible = false;

//数据库路径

lilDBPath.Text = HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"];

//新建一个 FileInfo 对象，并获得数据库文件的大小，然后转换单位为KB

FileInfo myFileInfo = new FileInfo(lilDBPath.Text);

lilDBSize.Text = Convert.ToString(myFileInfo.Length/1024) + " KB";

//如果两个参数都不为空，则继续执行

if (Request.QueryString["cmd"] != null Request.QueryString["source"] != null)

{

//备份数据库原文件名

string sourceFileName = Request.QueryString["source"];

//如果 cmd 参数为 DelFile

if (Request.QueryString["cmd"].Equals("DelFile"))

{

//删除备份数据库文件

File.Delete(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\" + sourceFileName);

//刷新备份文件列表

ListBackupFiles();

Showmsg.Visible = true;

Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'删除备份数据库成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";

}

//如果 cmd 参数为 Restore

if (Request.QueryString["cmd"].Equals("Restore"))

{

//用备份文件覆盖原文件

File.Copy(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\" + sourceFileName, HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"], true);

//刷新备份文件列表

ListBackupFiles();

Showmsg.Visible = true;

Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'还原备份数据库成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";

}

}

}

}

protected void lnkbtnCompactDB_Click(object sender, EventArgs e)

{

//压缩修复数据库

AccessDBtool.CompactAccessDB(SysConfig.ConnectionString, HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"]);

Showmsg.Visible = true;

Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'压缩修复数据库成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";

}

protected void lnkbtnBackupDB_Click(object sender, EventArgs e)

{

string sourceFileName = HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"];

string destFileName = HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\" + "Backup_";

destFileName += DateTime.Now.ToString("yyyyMMddHHmmss");

destFileName += ".mbk";

//将数据库文件Copy到Backup目录，如果有重名文件就覆盖原文件

File.Copy(sourceFileName, destFileName, true);

//生成备份文件列表

ListBackupFiles();

Showmsg.Visible = true;

Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'备份数据库成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";

}

/// summary

/// 生成备份文件列表

/// /summary

/// returns文件列表，文件详细信息及操作选项的HTML代码/returns

public void ListBackupFiles()

{

//如果目录不存在则创建次目录

if (!Directory.Exists(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\"))

Directory.CreateDirectory(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\");

DirectoryInfo mydir = new DirectoryInfo(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\");

StringBuilder sb = new StringBuilder();

foreach (FileInfo f in mydir.GetFiles())

{

sb.Append("a href='backup/" + f.Name + "' target='_blank'img border='0' src='images/mdb.gif' style='margin:4px 3px -3px 0px'/" + f.Name + "/a  a href='?cmd=DelFilesource=" + f.Name + "' title='删除备份文件'删除/a | a href='?cmd=Restoresource=" + f.Name + "' title='删除备份文件'还原数据库/a | " + f.Length/1024 + " KB | " + f.CreationTime + "br /");

}

lilBackupFileList.Text = sb.ToString();

}

}

把下面这句换成你的数据库地址：

//数据库路径

// lilDBPath.Text = HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"];

vb.net如何将JPG文件缩放至不大于指定的字节数

1.我有个思路可以尝试一下：把一张字节数在280-300K的图片用PS打开看看像素大小；

2.定义一个新的位图，指定像素大小为上面得到的数据；

3.读取你需要修改大小的JPG文件，然后按指定大小复制到上面新建的位图，并保存为JPG格式

VB.net 如何将TXT文件转换压缩成.gz文件

手机敲很累的！一定要给分啊！格式是：tar 选项 文件.选项有 -c:产生打包文件 -v:显示详细信息 -f:指定压缩后的文件名 -z:打包同时压缩！举个例子吧！将目录my打包并压缩成my.tar.gz就这样tar -zcvf my.tar.gz my

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