C# 图片操作(图片读取，保存，转换，传输)
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JPG PNG GIF BMP图片格式的区别:
| 类型 | 优点 | 缺点 | 应用场景 | 相同图片大小比较 |
| BMP | 无损压缩图质最好 | 文件太大不利于网络传输 | 152K | |
| GIF | 动画存储格式 | 最多256色画质差 | 53K | |
| PNG | 可保存透明背景的图片 | 画质中等 | 202K | |
| JPG | 文件小利于网络传输 | 画质损失 | 车牌识别 | 84K |
图片代码操作:
根据图片的相对路径 获取Image对象:
/// <summary>
/// 根据图片的相对路径 获取Image对象
/// </summary>
/// <param name="imgPath">图片的相对路径(如:@"/images/star.png")</param>
/// <returns></returns>
public static Image GetImage(string imgPath)
{
if (File.Exists(imgPath))
{
Image im = new Image();
im.Source = GetBitmapImage(imgPath);
return im;
}
else
return null;
}根据图片的相对路径 返回 BitmapImage对象的实例化:
/// <summary>
/// 根据图片的相对路径 返回 BitmapImage对象的实例化
/// </summary>
/// <param name="imgPath">图片的相对路径(如:@"/images/star.png")</param>
/// <returns></returns>
public static BitmapImage GetBitmapImage(string imgPath)
{
try
{
if (!imgPath.StartsWith("/"))
{
imgPath = "/" + imgPath;
}
return new BitmapImage(new Uri("Pack://application:,,," + imgPath));
}
catch
{
return null;
}
}根据图片的相对路径 获取ImageBrush对象:
/// <summary>
/// 根据图片的相对路径 获取ImageBrush对象 (此对象资源可以直接用于绑定控件的Background属性)
/// </summary>
/// <param name="imgPath">图片的相对路径(如:@"/images/star.png")</param>
/// <returns></returns>
public static ImageBrush GetImageBrush(string imgPath)
{
if (File.Exists(imgPath))
{
ImageBrush ib = new ImageBrush();
ib.ImageSource = GetBitmapImage(imgPath);
return ib;
}
else
return null;
}在Path中读取图片byte[]:
/// <summary>
/// 根据图片的路径解析成图片资源
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public static byte[] BitmapImageToByteArray(String filePath)
{
byte[] byteArray = null ;
if(File.Exists(filePath))
byteArray = File.ReadAllBytes(filePath);
return byteArray;
}byte[]转BitmapImage
/// <summary>
/// 解析字节数组成图片
/// </summary>
/// <param name="byteArray"></param>
/// <returns></returns>
public static BitmapImage ByteArrayToBitmapImage(byte[] byteArray)
{
BitmapImage bmp = null;
try
{
bmp = new BitmapImage();
bmp.BeginInit();
bmp.StreamSource = new MemoryStream(byteArray);
bmp.EndInit();
}
catch
{
bmp = null;
}
return bmp;
}BitmapImage转byte[]
/// <summary>
/// 图片数据解析成字节流数组(用于存储到数据库)
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
public static byte[] BitmapImageToByteArray(BitmapImage bmp)
{
byte[] byteArray = null;
try
{
Stream sMarket = bmp.StreamSource;
if (sMarket != null && sMarket.Length > 0)
{
sMarket.Position = 0;
using (BinaryReader br = new BinaryReader(sMarket))
{
byteArray = br.ReadBytes((int)sMarket.Length);
}
}
}
catch
{
}
return byteArray;
}将Bitmap对象转换成bitmapImage对象:
/// <summary>
/// 将Bitmap对象转换成bitmapImage对象
/// </summary>
/// <param name="bitmap"></param>
/// <returns></returns>
public BitmapImage ConvertBitmapToBitmapImage(Bitmap bitmap)
{
MemoryStream stream = new MemoryStream();
bitmap.Save(stream, ImageFormat.Bmp);
BitmapImage image = new BitmapImage();
image.BeginInit();
image.StreamSource = stream;
image.EndInit();
return image;
}将bitmapImage对象转换成Bitmap对象:
/// <summary>
/// 将bitmapImage对象转换成Bitmap对象
/// </summary>
/// <param name="bitmapImage"></param>
/// <returns></returns>
public static System.Drawing.Bitmap BitmapImageToBitmap(BitmapImage bitmapImage)
{
using (System.IO.MemoryStream outStream = new System.IO.MemoryStream())
{
BitmapEncoder enc = new BmpBitmapEncoder();
enc.Frames.Add(BitmapFrame.Create(bitmapImage));
enc.Save(outStream);
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(outStream);
return bitmap;
}
}bitmap转换成ImageSource:
[DllImport("gdi32.dll", SetLastError = true)]
private static extern bool DeleteObject(IntPtr hObject);
/// <summary>
/// 从bitmap转换成ImageSource
/// </summary>
/// <param name="icon"></param>
/// <returns></returns>
public static ImageSource ChangeBitmapToImageSource(Bitmap bitmap)
{
IntPtr hBitmap = bitmap.GetHbitmap();
ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
hBitmap,
IntPtr.Zero,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
if (!DeleteObject(hBitmap))//记得要进行内存释放。否则会有内存不足的报错。
{
throw new System.ComponentModel.Win32Exception();
}
return wpfBitmap;
}从Bitmap转换成BitmapSource:
/// <summary>
/// 从Bitmap转换成BitmapSource
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
public static BitmapSource ChangeBitmapToBitmapSource(Bitmap bmp)
{
BitmapSource returnSource;
try
{
returnSource = Imaging.CreateBitmapSourceFromHBitmap(bmp.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
}
catch
{
returnSource = null;
}
return returnSource;
}从Icon到ImageSource的转换:
/// <summary>
/// 从Icon到ImageSource的转换
/// </summary>
public ImageSource ChangeIconToImageSource(Icon icon)
{
ImageSource imageSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(
icon.Handle,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
return imageSource;
}Stream保存图片:
FileStream fs = new FileStream("A.jpg", FileMode.Create, FileAccess.ReadWrite);
Stream MyStream = new MemoryStream((byte[])imageBytes); //取出的byte[]数组
int read = 0;
byte[] Mybyte = new byte[1024];
do
{
read = MyStream.Read(Mybyte,0,1024);
fs.Write(Mybyte,0,read);
} while (read > 0);
MyStream.Flush();
MyStream.Close();
fs.Flush();
fs.Close();
图片通过CGI获取保存到本地快照:
public string Address = "url address";
public void SavefromWeb()
{
FileStream fs = new FileStream("D:\\Image.jpg",FileMode.Create,FileAccess.ReadWrite);
HttpWebRequest MyHttpWebRequest = null;
HttpWebResponse MyHttpWebResponse = null;
Stream MyStream = null;
try
{
MyHttpWebRequest = (HttpWebRequest)HttpWebRequest.Create(Address);
MyHttpWebResponse = (HttpWebResponse)MyHttpWebRequest.GetResponse();
MyStream = MyHttpWebResponse.GetResponseStream();
}
catch(Exception)
{
}
int read = 0;
byte[] Mybyte=new byte[1024];
do
{
read = MyStream.Read(Mybyte,0,1024);
fs.Write(Mybyte,0,read);
}while(read>0);
MyStream.Flush();
MyStream.Close();
MyHttpWebResponse.Close();
fs.Flush();
fs.Close();
}参考:wpf 图片操作类 ImageBrush BitmapImage - ﹎蓝言觅ぷ雨 - 博客园
WPF1---图片的获取与存储 - Probably - 博客园
JPG PNG GIF BMP图片格式的区别_Wanda && Aidem -CSDN博客_bmp jpg png 区别