ImageRas _Ras = new ImageRas(@"D:\temp\test.ras"); 
pictureBox1.Image = _Ras.Image; 
_Ras.SaveRas(@"d:\temp\OK.ras"); 
 
我只实现了24位色和8位色 这个结构也太简单了。只有文件头和数据区 。就是8位色的色彩表有些特殊 
先是红色表 绿色表 蓝色表 平时都是 RGB、RGB 这样放 这东西居然RRRR.....GGG......B.... 
不知道怎么想的。 
项目多了很少有时间做这些东西了。下个目标是IFF文件 
全部代码 
 代码如下:

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Runtime.InteropServices; 
using System.Drawing.Imaging; 
using System.Drawing; 
using System.IO; 
namespace Zgke.MyImage.ImageFile 
{ 
/// <summary> 
/// SUN光栅图形 RAS 
/// zgke@sina.com 
/// qq:116149 
/// </summary> 
public class ImageRas 
{ 
public ImageRas(string p_ImageFile) 
{ 
if (System.IO.File.Exists(p_ImageFile)) 
{ 
LoadImage(System.IO.File.ReadAllBytes(p_ImageFile)); 
} 
} 
public ImageRas() 
{ 
} 
#region 私有 
/// <summary> 
/// 文件头 956AA659 
/// </summary> 
private uint m_Mageic = 0x956AA659; 
/// <summary> 
/// 宽 
/// </summary> 
private uint m_Width = 0; 
/// <summary> 
/// 高 
/// </summary> 
private uint m_Height = 0; 
/// <summary> 
/// 颜色深 
/// </summary> 
private uint m_Depth = 0; 
/// <summary> 
/// 图形区域数据大小 
/// </summary> 
private uint m_Length = 0; 
/// <summary> 
/// 数据类型 
/// </summary> 
private uint m_Type = 0; 
/// <summary> 
/// 色彩图形类型 
/// </summary> 
private uint m_MapType = 0; 
/// <summary> 
/// 色彩长度 
/// </summary> 
private uint m_MapLength = 0; 
/// <summary> 
/// 颜色表 
/// </summary> 
private Color[] m_ColorList = new Color[256]; 
/// <summary> 
/// 图形 
/// </summary> 
private Bitmap m_Image; 
#endregion 
/// <summary> 
/// 获取图形 
/// </summary> 
public Bitmap Image 
{ 
get 
{ 
return m_Image; 
} 
set 
{ 
if (value != null) 
{ 
m_Image = value; 
m_Width = (uint)value.Width; 
m_Height = (uint)value.Height; 
switch (value.PixelFormat) 
{ 
case PixelFormat.Format8bppIndexed: 
break; 
case PixelFormat.Format32bppArgb: 
break; 
default: 
m_Depth = 24; 
break; 
} 
} 
} 
} 
/// <summary> 
/// 获取数据 
/// </summary> 
/// <param name="p_ImageBytes"></param> 
private void LoadImage(byte[] p_ImageBytes) 
{ 
if (BitConverter.ToUInt32(p_ImageBytes, 0) != m_Mageic) throw new Exception("文件头不正确！"); 
m_Width = BytesToUint(p_ImageBytes, 4); 
m_Height = BytesToUint(p_ImageBytes, 8); 
m_Depth = BytesToUint(p_ImageBytes, 12); 
m_Length = BytesToUint(p_ImageBytes, 16); 
m_Type = BytesToUint(p_ImageBytes, 20); 
m_MapType = BytesToUint(p_ImageBytes, 24); 
m_MapLength = BytesToUint(p_ImageBytes, 28); 
int _StarIndex = 32; 
switch (m_MapType) 
{ 
case 1: 
int _ColorTable = (int)m_MapLength / 3; 
for (int i = 0; i != _ColorTable; i++) 
{ 
m_ColorList[i] = Color.FromArgb(p_ImageBytes[_StarIndex], p_ImageBytes[_StarIndex + _ColorTable], p_ImageBytes[_StarIndex + (_ColorTable * 2)]); 
_StarIndex++; 
} 
_StarIndex += _ColorTable * 2; 
break; 
default: 
break; 
} 
LoadData(p_ImageBytes, _StarIndex); 
} 
/// <summary> 
/// 字节转换为UINT 
/// </summary> 
/// <param name="p_Value">字节数组</param> 
/// <param name="p_Index">开始位置</param> 
/// <returns></returns> 
private uint BytesToUint(byte[] p_Value, int p_Index) 
{ 
byte[] _ValueBytes = new byte[4]; 
_ValueBytes[0] = p_Value[p_Index + 3]; 
_ValueBytes[1] = p_Value[p_Index + 2]; 
_ValueBytes[2] = p_Value[p_Index + 1]; 
_ValueBytes[3] = p_Value[p_Index]; 
return BitConverter.ToUInt32(_ValueBytes, 0); 
} 
/// <summary> 
/// 获取反转的BYTES 
/// </summary> 
/// <param name="p_Value"></param> 
/// <returns></returns> 
private byte[] UintToBytes(uint p_Value) 
{ 
byte[] _ValueBytes = BitConverter.GetBytes(p_Value); 
Array.Reverse(_ValueBytes); 
return _ValueBytes; 
} 
/// <summary> 
/// 获取图形数据 
/// </summary> 
/// <param name="p_ValueBytes">文件留</param> 
/// <param name="p_StarIndex">RGB留开始位置</param> 
private void LoadData(byte[] p_ValueBytes, int p_StarIndex) 
{ 
PixelFormat _Format = PixelFormat.Format24bppRgb; 
switch (m_Depth) 
{ 
case 8: 
_Format = PixelFormat.Format8bppIndexed; 
break; 
case 24: 
_Format = PixelFormat.Format24bppRgb; 
break; 
default: 
throw new Exception("未实现！"); 
} 
m_Image = new Bitmap((int)m_Width, (int)m_Height, _Format); 
BitmapData _Data = m_Image.LockBits(new Rectangle(0, 0, m_Image.Width, m_Image.Height), ImageLockMode.ReadWrite, m_Image.PixelFormat); 
byte[] _WriteBytes = new byte[_Data.Height * _Data.Stride]; 
int _StarIndex = 0; 
int _WriteIndex = 0; 
for (int i = 0; i != _Data.Height; i++) 
{ 
_WriteIndex = i * _Data.Stride; 
_StarIndex = i * ((int)m_Length / (int)m_Height) + p_StarIndex; 
for (int z = 0; z != _Data.Width; z++) 
{ 
switch (m_Depth) 
{ 
case 8: 
_WriteBytes[_WriteIndex] = p_ValueBytes[_StarIndex]; 
_WriteIndex++; 
_StarIndex++; 
break; 
case 24: 
_WriteBytes[_WriteIndex] = p_ValueBytes[_StarIndex + 2]; 
_WriteBytes[_WriteIndex + 1] = p_ValueBytes[_StarIndex + 1]; 
_WriteBytes[_WriteIndex + 2] = p_ValueBytes[_StarIndex]; 
_WriteIndex += 3; 
_StarIndex += 3; 
break; 
} 
} 
} 
switch (m_Depth) 
{ 
case 8: 
ColorPalette _Palette = m_Image.Palette; 
for (int i = 0; i != m_ColorList.Length; i++) 
{ 
_Palette.Entries[i] = m_ColorList[i]; 
} 
m_Image.Palette = _Palette; 
break; 
default: 
break; 
} 
Marshal.Copy(_WriteBytes, 0, _Data.Scan0, _WriteBytes.Length); 
m_Image.UnlockBits(_Data); 
} 
/// <summary> 
/// 保存图形 
/// </summary> 
/// <returns></returns> 
private byte[] SaveImageOfRas() 
{ 
if (m_Image == null) return new byte[0]; 
MemoryStream _Stream = new MemoryStream(); 
_Stream.Write(BitConverter.GetBytes(m_Mageic), 0, 4); 
_Stream.Write(UintToBytes(m_Width), 0, 4); 
_Stream.Write(UintToBytes(m_Height), 0, 4); 
switch (m_Depth) 
{ 
case 8: 
BitmapData _Data256 = m_Image.LockBits(new Rectangle(0, 0, m_Image.Width, m_Image.Height), ImageLockMode.ReadOnly, m_Image.PixelFormat); 
byte[] _DataBytes = new byte[_Data256.Stride * _Data256.Height]; 
int _Stride = _Data256.Stride; 
Marshal.Copy(_Data256.Scan0, _DataBytes, 0, _DataBytes.Length); 
m_Image.UnlockBits(_Data256); 
_Stream.Write(UintToBytes(8), 0, 4); 
uint _WidthCount = (uint)m_Image.Width; 
if (m_Image.Width % 2 != 0) _WidthCount = (uint)m_Image.Width + 1; 
uint _AllCount = _WidthCount * (uint)m_Image.Height; 
_Stream.Write(UintToBytes(_AllCount), 0, 4); 
_Stream.Write(UintToBytes(0), 0, 4); 
_Stream.Write(UintToBytes(1), 0, 4); 
_Stream.Write(UintToBytes(768), 0, 4); 
byte[] _RedBytes = new byte[256]; 
byte[] _GreenBytes = new byte[256]; 
byte[] _BlueBytes = new byte[256]; 
for (int i = 0; i != 256; i++) 
{ 
_RedBytes[i] = m_Image.Palette.Entries[i].R; 
_GreenBytes[i] = m_Image.Palette.Entries[i].G; 
_BlueBytes[i] = m_Image.Palette.Entries[i].B; 
} 
_Stream.Write(_RedBytes, 0, _RedBytes.Length); 
_Stream.Write(_GreenBytes, 0, _GreenBytes.Length); 
_Stream.Write(_BlueBytes, 0, _BlueBytes.Length); 
byte[] _Write = new byte[_WidthCount]; 
for (int i = 0; i != m_Image.Height; i++) 
{ 
Array.Copy(_DataBytes, i * _Stride, _Write, 0, _WidthCount); 
_Stream.Write(_Write, 0, _Write.Length); 
} 
break; 
default: 
Bitmap _NewBitmap = new Bitmap(m_Image.Width, m_Image.Height, PixelFormat.Format24bppRgb); 
Graphics _Graphics = Graphics.FromImage(_NewBitmap); 
_Graphics.DrawImage(m_Image, new Rectangle(0, 0, m_Image.Width, m_Image.Height)); 
_Graphics.Dispose(); 
BitmapData _Data24 = _NewBitmap.LockBits(new Rectangle(0, 0, _NewBitmap.Width, _NewBitmap.Height), ImageLockMode.ReadOnly, _NewBitmap.PixelFormat); 
byte[] _DataBytes24 = new byte[_Data24.Stride * _Data24.Height]; 
int _Stride24 = _Data24.Stride; 
Marshal.Copy(_Data24.Scan0, _DataBytes24, 0, _DataBytes24.Length); 
_NewBitmap.UnlockBits(_Data24); 
_Stream.Write(UintToBytes(24), 0, 4); 
uint _WidthCount24 = (uint)_NewBitmap.Width; 
if (_NewBitmap.Width % 2 != 0) _WidthCount24 = (uint)_NewBitmap.Width + 1; 
uint _AllCount24 = _WidthCount24 * (uint)_NewBitmap.Height * 3; 
_WidthCount24 = _WidthCount24 * 3; 
_Stream.Write(UintToBytes(_AllCount24), 0, 4); 
_Stream.Write(UintToBytes(0), 0, 4); 
_Stream.Write(UintToBytes(0), 0, 4); 
_Stream.Write(UintToBytes(0), 0, 4); 
byte[] _Write24 = new byte[0]; 
for (int i = 0; i != m_Image.Height; i++) 
{ 
_Write24 = new byte[_WidthCount24]; 
int _WriteIndex = 0; 
int _StarIndex = i * _Stride24; 
for (int z = 0; z != m_Image.Width; z++) 
{ 
_Write24[_WriteIndex] = _DataBytes24[_StarIndex + 2]; 
_Write24[_WriteIndex + 1] = _DataBytes24[_StarIndex + 1]; 
_Write24[_WriteIndex + 2] = _DataBytes24[_StarIndex]; 
_WriteIndex += 3; 
_StarIndex += 3; 
} 
_Stream.Write(_Write24, 0, _Write24.Length); 
} 
_NewBitmap.Dispose(); 
break; 
} 
byte[] _Return = _Stream.ToArray(); 
return _Return; 
} 
/// <summary> 
/// 保存图形到RAS文件 
/// </summary> 
/// <param name="p_File"></param> 
public void SaveRas(string p_File) 
{ 
byte[] _Value = SaveImageOfRas(); 
if (_Value.Length != 0) File.WriteAllBytes(p_File, _Value); 
} 
} 
} 

 
 




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