简单的C#图片压缩类-winform[原创]

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dreamdlm

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发表于 2006-8-1 21:00:00 |显示全部楼层

#region C#图片处理功能 -- BY DREAMDLM
/*
{*******************************************************************}
{ }
{ C#图片处理功能-DREAMDLM }
{ }
{*******************************************************************}
*/
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;
namespace EU.EUClass
{
class ImgGDI
{
public ImgGDI()
{
//构造函数
}
///
/// Bitmap转换byte[]数组
///
///
///
public byte[] Bmptobyte(Bitmap bmp)
{
MemoryStream ms = new MemoryStream();
bmp.Save(ms, ImageFormat.Jpeg);
ms.Flush();
byte[] buffer = ms.GetBuffer();
ms.Close();
return buffer;
}
///
/// byte[]数组转换Bitmap
///
///
///
public Bitmap bytetobmp(byte[] buffer)
{
MemoryStream ms = new MemoryStream();
ms.Write(buffer, 0, buffer.Length);
Bitmap bmp = new Bitmap(ms);
ms.Close();
return bmp;
}
///
/// 返回默认图片
///
///
public Bitmap getInstance()
{
Bitmap bmp = DefaultPic();
return bmp;
}
///
/// 选取本地图片
///
///
///
public Bitmap LocalIMG(string IMG)
{
FileStream fs = new FileStream(IMG, FileMode.Open);
Bitmap bmp = new Bitmap(fs);
fs.Close();
return bmp;
}
///
/// 返回流状态图片
///
///
///
public Bitmap ImgFromBase64(string Img)
{
Bitmap bmp;
byte[] buffer = Convert.FromBase64String(Img);
if (buffer.Length > 0)
{
MemoryStream ms = new MemoryStream();
ms.Write(buffer, 0, buffer.Length);
bmp = new Bitmap(ms);
ms.Close();
return bmp;
}
else
{
bmp = DefaultPic() ;
return bmp;
}
}
///
/// 默认图片
///
///
private Bitmap DefaultPic()
{
FileStream fs = new FileStream(Application.StartupPath + @"\Goodr.jpg", FileMode.Open);
Bitmap bmp = new Bitmap(fs);
fs.Close();
return bmp;
}
///
/// GDI压缩图片
///
/// 传入参数Bitmap
///
public byte[] ImageGdi(Bitmap bmp)
{
Bitmap xbmp = new Bitmap(bmp);
MemoryStream ms = new MemoryStream();
xbmp.Save(ms, ImageFormat.Jpeg);
byte[] buffer;
ms.Flush();
if (ms.Length > 95000)
{
//buffer = ms.GetBuffer();
double new_width = 0;
double new_height = 0;
Image m_src_image = Image.FromStream(ms);
if (m_src_image.Width >= m_src_image.Height)
{
new_width = 1024;
new_height = new_width * m_src_image.Height / (double)m_src_image.Width;
}
else if (m_src_image.Height >= m_src_image.Width)
{
new_height = 768;
new_width = new_height * m_src_image.Width / (double)m_src_image.Height;
}
Bitmap bbmp = new Bitmap((int)new_width, (int)new_height, m_src_image.PixelFormat);
Graphics m_graphics = Graphics.FromImage(bbmp);
m_graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
m_graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
m_graphics.DrawImage(m_src_image, 0, 0, bbmp.Width, bbmp.Height);
ms = new MemoryStream();
bbmp.Save(ms, ImageFormat.Jpeg);
buffer = ms.GetBuffer();
ms.Close();
return buffer;
}
else
{
buffer = ms.GetBuffer();
ms.Close();
return buffer;
}
}
}
}