private void each(string path)
{
DirectoryInfo TheFolder = new DirectoryInfo(path);
DirectoryInfo[] directoryInfos = TheFolder.GetDirectories();
foreach (DirectoryInfo directoryInfo in directoryInfos)
{
each(directoryInfo.FullName);
}
//判断是否有压缩文件夹
DirectoryInfo mypath = new DirectoryInfo(path + "\\压缩\\");
//先判断是否有需要压缩的图片
FileInfo[] files = TheFolder.GetFiles();
int fileCount = 0;
foreach (FileInfo file in files)
{
if (file.Extension == ".jpg" || file.Extension == "png" || file.Extension == "gif")
{
fileCount++;
}
}
if (fileCount > 0)
{
//创建压缩文件夹
mypath.Create();
foreach (FileInfo fileInfo in TheFolder.GetFiles())
{
string savePath = fileInfo.DirectoryName + "\\压缩\\" + fileInfo.Name;
ImageParams image = new ImageParams();
image.sFile = fileInfo.FullName;
image.dFile = savePath;
image.flag = 90;
image.size = 300;
image.sfsc = true;
ThreadPool.QueueUserWorkItem(new WaitCallback(CompressImage), image);
//CompressImage(fileInfo.FullName, savePath);
}
}
}
/// <summary>
/// 无损压缩图片
/// </summary>
/// <param name="sFile">原图片地址</param>
/// <param name="dFile">压缩后保存图片地址</param>
/// <param name="flag">压缩质量（数字越小压缩率越高）1-100</param>
/// <param name="size">压缩后图片的最大大小</param>
/// <param name="sfsc">是否是第一次调用</param>
/// <returns></returns>
private void CompressImage(object iamgeObj)
{
ImageParams imageParams = (ImageParams)iamgeObj;
string sFile = imageParams.sFile;
string dFile = imageParams.dFile;
int flag = imageParams.flag;
int size = imageParams.size;
bool sfsc = imageParams.sfsc;
//如果是第一次调用，原始图像的大小小于要压缩的大小，则直接复制文件，并且返回true
FileInfo firstFileInfo = new FileInfo(sFile);
if (sfsc == true && firstFileInfo.Length < size * 1024)
{
firstFileInfo.CopyTo(dFile);
add(1);
//return true;
}
else
{
try
{
System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);
ImageFormat tFormat = iSource.RawFormat;
int dHeight = iSource.Height / 2;
int dWidth = iSource.Width / 2;
int sW = 0, sH = 0;
//按比例缩放
System.Drawing.Size tem_size = new System.Drawing.Size(iSource.Width, iSource.Height);
if (tem_size.Width > dHeight || tem_size.Width > dWidth)
{
if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth))
{
sW = dWidth;
sH = Convert.ToInt32(dWidth) * tem_size.Height / tem_size.Width;
}
else
{
sH = dHeight;
sW = (tem_size.Width * dHeight) / tem_size.Height;
}
}
else
{
sW = tem_size.Width;
sH = tem_size.Height;
}
Bitmap ob = new Bitmap(dWidth, dHeight);
Graphics g = Graphics.FromImage(ob);
g.Clear(System.Drawing.Color.WhiteSmoke);
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.DrawImage(iSource, new System.Drawing.Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
g.Dispose();
//以下代码为保存图片时，设置压缩质量
EncoderParameters ep = new EncoderParameters();
long[] qy = new long[1];
qy[0] = flag;//设置压缩的比例1-100
EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
ep.Param[0] = eParam;
try
{
ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo jpegICIinfo = null;
for (int x = 0; x < arrayICI.Length; x++)
{
if (arrayICI[x].FormatDescription.Equals("JPEG"))
{
jpegICIinfo = arrayICI[x];
break;
}
}
if (jpegICIinfo != null)
{
ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径
FileInfo fi = new FileInfo(dFile);
if (fi.Length > 1024 * size)
{
flag = flag - 10;
ImageParams image = new ImageParams();
image.sFile = sFile;
image.dFile = dFile;
image.flag = flag;
image.size = size;
image.sfsc = false;
CompressImage(image);
}
else
{
add(2);
}
}
else
{
ob.Save(dFile, tFormat);
add(3);
}
iSource.Dispose();
ob.Dispose();
//return true;
}
catch
{
//return false;
}
}
catch (Exception e)
{
//return false;
}
}
}