/// <summary>
/// 生成缩略图重载方法4，返回缩略图的Image对象
/// 必须先调用SetConstructer
/// </summary>
/// <param name="Percent">缩略图的宽度百分比 如：需要百分之80，就填0.8</param>
/// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:\Images\filename.jpg</param>
/// <returns>成功返回true,否则返回false</returns>
public bool GetReducedImage(double Percent, string targetFilePath)
{
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);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return(true);
}
catch (Exception e)
{
ErrMessage = e.Message;
return(false);
}
}
//<summary>
//生成缩略图重载方法2，将缩略图文件保存到指定的路径
//</summary>.
//<param name=”Width”>缩略图的宽度</param>
//<param name=”Height”>缩略图的高度</param>
//<param name=”targetFilePath”>缩略图保存的全文件名，(带路径)，参数格式：D:Images ilename.jpg</param>
//<returns>成功返回true，否则返回false</returns>
public static bool GetReducedImage(int Width, int Height, string sourcePath, string targetFilePath)
{
try
{
Image ResourceImage = Image.FromFile(sourcePath);
#region 过滤掉很小不用做缩略图的图片
if (ResourceImage.Width < Width)
{
ResourceImage.Save(@targetFilePath, ImageFormat.Jpeg);
if (System.IO.File.Exists(@targetFilePath))
{
File.SetAttributes(@targetFilePath, FileAttributes.Hidden);
}
ResourceImage.Dispose();
return(true);
}
#endregion
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(() => { return(false); });
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
ResourceImage.Dispose();
if (System.IO.File.Exists(@targetFilePath))
{
File.SetAttributes(@targetFilePath, FileAttributes.Hidden);
}
return(true);
}
catch
{
return(false);
}
}
/// <summary>
/// 生成缩略图重载方法4，返回缩略图的Image对象
/// </summary>
/// <param name="Percent">缩略图的宽度百分比 如：需要百分之80，就填0.8</param>
/// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:Images ilename.jpg</param>
/// <returns>成功返回true,否则返回false</returns>
public static bool GetReducedImage(string sourceFilePath, double Percent, string targetFilePath)
{
try
{
var image = Image.FromFile(sourceFilePath);
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
var width = Convert.ToInt32(image.Width * Percent);
var height = Convert.ToInt32(image.Width * Percent);
ReducedImage = image.GetThumbnailImage(width, height, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return(true);
}
catch (Exception e)
{
return(false);
}
}
/// <summary>
/// 按照固定宽度来缩放
/// </summary>
/// <param name="sourceFilePath"></param>
/// <param name="Width"></param>
/// <param name="Height"></param>
/// <param name="targetFilePath"></param>
/// <returns></returns>
public static bool GetReducedImage(string sourceFilePath, int width, string targetFilePath)
{
try
{
var image = Image.FromFile(sourceFilePath);
Image ReducedImage;
var height = 0;
if (image.Width > image.Height)
{
height = Convert.ToInt32((image.Height * 1.0) / image.Width * width);
}
else
{
height = width;
width = Convert.ToInt32(image.Width * 1.0 / image.Height * width);
}
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = image.GetThumbnailImage(width, height, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return(true);
}
catch (Exception e)
{
return(false);
}
}
public bool GetReducedImage(double Percent, string targetFilePath)
{
try
{
Bitmap bt = new Bitmap(120, 120); //创建Bitmap实例
Graphics g = Graphics.FromImage(bt); //创建Graphics实例
g.Clear(Color.White); //设置画布背景颜色为白色
Image ReducedImage; //缩略图
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent); //设置宽度
ImageHeight = Convert.ToInt32(ResourceImage.Height * Percent); //设置高度
//获取所谓图
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
if (ImageWidth > ImageHeight) //如果原图宽度大于高度
{
//缩放图片
g.DrawImage(ReducedImage, 0, (int)(120 - ImageHeight) / 2, ImageWidth, ImageHeight);
}
else
{
g.DrawImage(ReducedImage, (int)(120 - ImageWidth) / 2, 0, ImageWidth, ImageHeight);
}
g.DrawRectangle(new Pen(Color.Gray), 0, 0, 119, 119); //绘制缩略图的边框
bt.Save(@targetFilePath, ImageFormat.Jpeg); //保存缩略图
bt.Dispose(); //释放对象
ReducedImage.Dispose(); //释放对象
return(true);
}
catch (Exception e)
{
ErrMessage = e.Message;
return(false);
}
}
/// <summary>
/// 按大小压缩
/// </summary>
/// <param name="Width">压缩宽</param>
/// <param name="Height">压缩高</param>
/// <param name="targetFilePath">要压缩的图片路径</param>
/// <returns>返回压缩后的图片路径</returns>
public static string ReducedImage(int Width, int Height, string targetFilePath)
{
using (Image ResourceImage = Image.FromFile(targetFilePath))
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(delegate { return(false); });
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero); //按大小压缩
string newImagePath = targetFilePath.Substring(0, targetFilePath.LastIndexOf("\\") + 1) + Guid.NewGuid().ToString() + ".jpg"; //压缩图片的存储路径
ReducedImage.Save(newImagePath, ImageFormat.Jpeg); //保存压缩图片
ReducedImage.Dispose();
return(newImagePath); //返回压缩图片的存储路径
}
}
// 方法1，按大小
/// <summary>
/// 按大小缩放图片
/// </summary>
/// <param name="Width">缩放到的宽</param>
/// <param name="Height">缩放到的高</param>
/// <param name="targetFilePath">图片的名字</param>
/// <returns>bool</returns>
public bool ReducedImage(int Width, int Height, string targetFilePath)
{
try
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return(true);
}
catch (Exception e)
{
ErrorMessage = e.Message;
return(false);
}
}
/// <summary>
/// 生成缩略图重载方法2，将缩略图文件保存到指定的路径
/// 必须先调用SetConstructer
/// </summary>
/// <param name="Width">缩略图的宽度</param>
/// <param name="Height">缩略图的高度</param>
/// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:\Images\filename.jpg</param>
/// <returns>成功返回true，否则返回false</returns>
public bool GetReducedImage(int Width, int Height, string targetFilePath)
{
try
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
string fExt = System.IO.Path.GetExtension(targetFilePath).ToLower();
ImageFormat imagef = ImageFormat.Jpeg;
switch (fExt)
{
case ".jpg":
case ".jpeg":
imagef = ImageFormat.Jpeg;
break;
case ".bmp":
imagef = ImageFormat.Bmp;
break;
case ".png":
imagef = ImageFormat.Png;
break;
default:
break;
}
ReducedImage.Save(@targetFilePath, imagef);
ReducedImage.Dispose();
return(true);
}
catch (Exception e)
{
ErrMessage = e.Message;
return(false);
}
}
// 方法2，按百分比 缩小60% Percent为0.6 targetFilePath为目标路径
public static bool ReducedImage(Stream stream, double Percent, string targetFilePath)
{
try
{
ErrorMessage = "";
ResourceImage = Image.FromStream(stream);
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
ImageHeight = (ResourceImage.Height) * ImageWidth / ResourceImage.Width;//等比例缩放
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
ReducedImage.Save(targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return(true);
}
catch (Exception e)
{
ErrorMessage = e.Message;
return(false);
}
}
/// <summary>
/// 生成缩略图重载方法，将缩略图文件保存到指定的路径
/// </summary>
/// <param name="Width">缩略图的宽度</param>
/// <param name="Height">缩略图的高度</param>
/// <param name="targetFilePath">缩略图保存的全文件名，(带路径)，参数格式：D:Images ilename.jpg</param>
/// <returns>成功返回true，否则返回false</returns>
public bool GetReducedImage(int Width, int Height, string targetFilePath)
{
try
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
ReducedImage.Dispose();
return(true);
}
catch (Exception ex)
{
CSharpUtils.LogHelper.Error(String.Format("GetReducedImage {0} {1} {2} 异常", Width, Height, targetFilePath), ex);
return(false);
}
}
