C#壓縮圖片算法
2018-07-20 來源：open-open
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System;
namespace Bll
{
/// <summary>
/// 圖片處理類
/// 1、生成縮略圖片或按照比例改變圖片的大小和畫質(zhì)
/// 2、將生成的縮略圖放到指定的目錄下
/// </summary>
public class ImageHepler
{
public Image ResourceImage, ReducedImage;
private int ImageWidth;
private int ImageHeight;
public string ErrMessage;
/// <summary>
/// 類的構(gòu)造函數(shù)
/// </summary>
/// <param name="ImageFileName">圖片文件的全路徑名稱</param>
public ImageHepler(string ImageFileName)
{
ResourceImage = Image.FromFile(ImageFileName);
ErrMessage = "";
}
public bool ThumbnailCallback()
{
return false;
}
/// <summary>
/// 生成縮略圖，返回縮略圖的Image對象
/// </summary>
/// <param name="Width">縮略圖的寬度</param>
/// <param name="Height">縮略圖的高度</param>
/// <returns>縮略圖的Image對象</returns>
public Image GetReducedImage(int Width, int Height)
{
double LengthLong; //存儲（長和寬中）較短的長度
int widthOK, heightOK; //存儲實際要生成的圖片的長寬
if (Width < Height) //判斷輸入的長和寬那個較短
{
LengthLong = Width; //把較短的存儲在 LengthLonh 用于計算
}
else
{
LengthLong = Height;
}
try
{
//判斷原圖片 長和寬
//原圖比較長的一個邊要和縮略圖的邊相等
if (ResourceImage.Width > ResourceImage.Height)
{
widthOK = (int)LengthLong;
heightOK = (int)(LengthLong / ResourceImage.Width * ResourceImage.Height);
}
else
{
heightOK = (int)LengthLong;
widthOK = (int)LengthLong / ResourceImage.Height * ResourceImage.Width;
}
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(widthOK, heightOK, callb, IntPtr.Zero);
return ReducedImage;
}
catch (Exception e)
{
ErrMessage = e.Message;
return null;
}
}
/// <summary>
/// 生成縮略圖，將縮略圖文件保存到指定的路徑
/// </summary>
/// <param name="Width">縮略圖的寬度</param>
/// <param name="Height">縮略圖的高度</param>
/// <param name="targetFilePath">縮略圖保存的全文件名，(帶路徑)，參數(shù)格式：D:\Images\filename.jpg</param>
/// <returns>成功返回true，否則返回false</returns>
public bool GetReducedImage(int Width, int Height, string targetFilePath)
{
double LengthLong; //存儲（長和寬中）較短的長度
int widthOK, heightOK; //存儲實際要生成的圖片的長寬
if (Width < Height) //判斷輸入的長和寬那個較短
{
LengthLong = Width; //把較短的存儲在 LengthLonh 用于計算
}
else
{
LengthLong = Height;
}
try
{
//判斷原圖片 長和寬
//原圖比較長的一個邊要和縮略圖的邊相等
if (ResourceImage.Width > ResourceImage.Height)
{
widthOK = (int)LengthLong;
heightOK = (int)(LengthLong / ResourceImage.Width * ResourceImage.Height);
}
else
{
heightOK = (int)LengthLong;
widthOK = (int)LengthLong / ResourceImage.Height * ResourceImage.Width;
}
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(widthOK, heightOK, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
//ReducedImage.Dispose();
return true;
}
catch (Exception e)
{
ErrMessage = e.Message;
return false;
}
}
/// <summary>
/// 生成縮略圖，返回縮略圖的Image對象
/// </summary>
/// <param name="Percent">縮略圖的寬度百分比 如：需要百分之80，就填0.8</param>
/// <returns>縮略圖的Image對象</returns>
public Image GetReducedImage(double Percent)
{
try
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
return ReducedImage;
}
catch (Exception e)
{
ErrMessage = e.Message;
return null;
}
}
/// <summary>
/// 生成縮略圖，返回縮略圖的Image對象
/// </summary>
/// <param name="Percent">縮略圖的寬度百分比 如：需要百分之80，就填0.8</param>
/// <param name="targetFilePath">縮略圖保存的全文件名，(帶路徑)，參數(shù)格式：D:\Images\filename.jpg</param>
/// <returns>成功返回true,否則返回false</returns>
public bool GetReducedImage(double Percent, string targetFilePath)
{
try
{
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
ImageHeight = Convert.ToInt32(ResourceImage.Width * Percent);
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
//ReducedImage.Dispose();
return true;
}
catch (Exception e)
{
ErrMessage = e.Message;
return false;
}
}
}
}
[csharp] view plaincopy
using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Security.AccessControl;
using System.Security.Permissions;
namespace Bll
{
public class FolderHelper
{
//判斷文件夾是否存在
public static bool checkFolderExits(string path)
{
DirectoryInfo dir = new DirectoryInfo(path);
if (dir.Exists)//文件夾存在
{
return true;
}
else
{
//dir.Create();//不存在就創(chuàng)建一個
return false;
}
}
//創(chuàng)建一個文件夾，存在就創(chuàng)建失敗
public static bool CreateNewFolder(string path)
{
DirectoryInfo dir = new DirectoryInfo(path);
if (!dir.Exists)
{
dir.Create();
return true;
}
else
return false;
}
/// <summary>
/// 在指定目錄下創(chuàng)建指定名稱文件夾
/// </summary>
/// <param name="ParentsPath"></param>
/// <param name="NewFolderName"></param>
/// <returns></returns>
public static bool CreateNewFolder(string ParentsPath, string NewFolderName)
{
string CreatePath = ParentsPath + @"\" + NewFolderName;
DirectoryInfo dir = new DirectoryInfo(CreatePath);
if (!dir.Exists)
{
dir.Create();
return true;
}
else
return false;
}
/// <summary>
/// 返回目錄下的所有文件名
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public static ArrayList getAllFiles(string path)
{
DirectoryInfo dir = new DirectoryInfo(path);
if (dir.Exists)
{
FileInfo[] fileinfo = dir.GetFiles();
ArrayList list = new ArrayList();
foreach (FileInfo f in fileinfo)
{
list.Add(f.Name);
}
return list;
}
else
return null;
}
/// <summary>
/// 計算文件夾的大小
/// </summary>
/// <param name="d"></param>
/// <returns></returns>
public static long DirSize(DirectoryInfo d)
{
long Size = 0;
// Add file sizes.
FileInfo[] fis = d.GetFiles();//獲得目錄文件列表
foreach (FileInfo fi in fis)
{
Size += fi.Length;
}
// Add subdirectory sizes.
DirectoryInfo[] dis = d.GetDirectories();//獲取目錄子目錄列表
foreach (DirectoryInfo di in dis)
{
Size += DirSize(di);
}
return Size;
}
/// <summary>
/// 把文件夾得大小轉(zhuǎn)換成比較合適的表示單位
/// </summary>
/// <param name="size"></param>
/// <returns></returns>
public static string ViewSize(long size)
{
long m=size;
string viewstr;
if ((m / 1024) > 0)//表示可以轉(zhuǎn)換成KB
{
m = m / 1024;//轉(zhuǎn)換成KB
if ((m / 1024) > 0)//表示可以轉(zhuǎn)換成MB
{
m = m / 1024;//轉(zhuǎn)換成MB了
if ((m / 1024) > 0)//表示可以轉(zhuǎn)換成GB
{
m = m / 1024;//轉(zhuǎn)換成GB了
viewstr = m.ToString() + "GB";
}
else
{
viewstr = m.ToString() + "MB";
}
}
else
{
viewstr = m.ToString() + "KB";
}
}
else
{
viewstr = m.ToString() + "byte";
}
return viewstr;
}
/// <summary>
/// 刪除指定目錄和內(nèi)容
/// </summary>
/// <param name="dir"></param>
/// <returns></returns>
public static bool delDir(string dir)
{
bool flag = false;
DirectoryInfo d = new DirectoryInfo(dir);
if (d.Exists)//判斷目錄是否存在
{
try
{
d.Delete();
flag = true;
}
catch (Exception e) { flag = false; }
}
return flag;
}
/// <summary>
/// 刪除指定文件
/// </summary>
/// <param name="fil"></param>
/// <returns></returns>
public static bool delFile(string fil)
{
bool flag = false;
FileInfo d = new FileInfo(fil);
if (d.Exists)//判斷目錄是否存在
{
try
{
d.Delete();
flag = true;
}
catch (Exception e) { flag = false; }
}
return flag;
}
public static void Copy(string sourceDirectory, string targetDirectory)
{
DirectoryInfo diSource = new DirectoryInfo(sourceDirectory);
DirectoryInfo diTarget = new DirectoryInfo(targetDirectory);
CopyAll(diSource, diTarget);
}
/// <summary>
/// 復(fù)制目錄及子文件到指定目錄
/// </summary>
/// <param name="source"></param>
/// <param name="target"></param>
public static void CopyAll(DirectoryInfo source, DirectoryInfo target)
{
// Check if the target directory exists, if not, create it.
if (Directory.Exists(target.FullName) == false)
{
Directory.CreateDirectory(target.FullName);
}
// Copy each file into it's new directory.
foreach (FileInfo fi in source.GetFiles())
{
Console.WriteLine(@"Copying {0}\{1}", target.FullName, fi.Name);
fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);
}
// Copy each subdirectory using recursion.
foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
{
DirectoryInfo nextTargetSubDir =
target.CreateSubdirectory(diSourceSubDir.Name);
CopyAll(diSourceSubDir, nextTargetSubDir);
}
}
/// <summary>
/// 循環(huán)讀取某個目錄下的所有文件和目錄，查詢有關(guān)每一項的一些信息。返回一個文件列表
/// </summary>
/// <param name="strCurrentDir"></param>
public static List<fileEntity> FileView(string strCurrentDir)
{
List<fileEntity> fileList = new List<fileEntity>();
DirectoryInfo dir = new DirectoryInfo(strCurrentDir);
foreach (FileSystemInfo fsi in dir.GetFileSystemInfos())//這個循環(huán)再讀取文件的信息
{
try
{
//FileSystemInfo 對象可以表示文件或目錄，從而可以作為 FileInfo 或 DirectoryInfo 對象的基礎(chǔ)。 當分析許多文件和目錄時，請使用該基類。
FileInfo fi;
DirectoryInfo di;
//創(chuàng)建一個自己寫的實體類的實體
fileEntity newfile = new fileEntity();
if (fsi is FileInfo)//外層循環(huán)讀取文件信息
{
//表示當前fsi是文件
fi = (FileInfo)fsi;
newfile.fileName = fi.Name;
newfile.fileExt = fi.Extension;
newfile.fileSize = fi.Length;
newfile.FileModify = fi.LastWriteTime;
//通過擴展名來選擇文件顯示圖標
switch (newfile.fileExt)
{
case ".gif":
newfile.picName = "gif.gif";
break;
default:
newfile.picName = "other.gif";
break;
}
newfile.picName = "<img src='" + newfile.picName + "' width=25 height=20>";
}
else
{
di = (DirectoryInfo)fsi;
newfile.fileName = di.Name;
newfile.fileSize = DirSize(di);//調(diào)用計算文件夾大小的方法
newfile.FileModify = di.LastWriteTime;
newfile.picName = "<img src='directory.gif' width=25 height=20>";
}
fileList.Add(newfile);
}
catch (Exception e) { }
}
return fileList;
}
/// <summary>
/// 顯示目錄和文件
/// </summary>
/// <param name="path"></param>
public static void All(string path)
{
FileInfo fi;//文件
DirectoryInfo di;//目錄
DirectoryInfo dir=null;
int i = 0; //控制行的顏色
try
{
dir = new DirectoryInfo(path);
}
catch (Exception e) { }
foreach (FileSystemInfo fsi in dir.GetFileSystemInfos())
{
try
{
fileEntity newfile = new fileEntity();
FolderEntity folder = new FolderEntity();
newfile.fileName = "";
newfile.picName = "";
newfile.fileExt = "";
newfile.fileSize = 0;
folder.folderName = "";
folder.picName = "";
i += 1;
if (fsi is FileInfo)//判斷當前讀取的是不是一個文件
{
//表示當前fsi是文件
fi = (FileInfo)fsi;
newfile.fileName = fi.Name;
newfile.fileExt = fi.Extension;
newfile.fileSize = fi.Length;
newfile.FileModify = fi.LastWriteTime;
//將文件加上可以下載文件的鏈接
newfile.fileName = "<a href='........'></a>";
//通過擴展名來選擇文件顯示圖標
//Response.Write(Session["DataBasePath"].ToString()+"\\filetype\\"+pfun.getFileExt(FileExt)+".gif");
if (fsi.Exists)
{
switch (newfile.fileExt)
{
case ".gif":
newfile.picName = "gif.gif";
break;
default:
newfile.picName = "other.gif";
break;
}
}
else
{
newfile.picName = "unknown.gif";
}
/*
switch(FileExt)
{
case ".gif":
FilePic = "gif.gif";
break;
default:
FilePic = "other.gif";
break;
}
*/
newfile.picName = "<img src='filetype/" + newfile.picName + "' width=16 height=16>";
}
else
{
//當前為目錄
di = (DirectoryInfo)fsi;
folder.folderName = di.Name;
//給目錄加上鏈接
folder.folderName = "<a href='.......'><a>";
folder.lastTime = di.LastWriteTime;
folder.picName = "<img src='filetype/folder.gif' width=16 height=16>";
}
}catch(Exception e){}
}
}
}
}
標簽： isp
版權(quán)申明：本站文章部分自網(wǎng)絡(luò)，如有侵權(quán)，請聯(lián)系：west999com@outlook.com
特別注意：本站所有轉(zhuǎn)載文章言論不代表本站觀點！
本站所提供的圖片等素材，版權(quán)歸原作者所有，如需使用，請與原作者聯(lián)系。
最新資訊
熱門推薦