WEP_V2.1.3/SourceCode/We.Zero/IwbYue.Zero/ToolCommon/FileHelpers/FileUpload.cs

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

using IwbZero.ToolCommon.LogHelpers;

namespace IwbZero.ToolCommon.FileHelpers
{
    public static class FileUpload
    {
        private static string GetFileExt(string fileName)
        {
            string fileExt = fileName.Substring(fileName.LastIndexOf(".", StringComparison.Ordinal) + 1, fileName.Length - fileName.LastIndexOf(".", StringComparison.Ordinal) - 1);
            return fileExt.ToLower();
        }

        public static string Base64ToFile(this string base64Str, string fileName, string filePath, string fileExt)
        {
            fileName = $"{fileName}.{fileExt}";
            string lcRetVal = Base64ToFile(base64Str, fileName, filePath);
            return lcRetVal;
        }

        public static string Base64ToFile(this string base64Str, string fileName, string filePath)
        {
            string lcRetVal = "error@";
            try
            {
                filePath = filePath.StartsWith("/") ? filePath : ("/" + filePath);
                filePath = filePath.EndsWith("/") ? filePath : (filePath + "/");

                string path = $"{AppDomain.CurrentDomain.BaseDirectory}{filePath}";
                if (!Directory.Exists(path))
                    Directory.CreateDirectory(path);
                byte[] bytes = Convert.FromBase64String(base64Str);
                using (FileStream fs = new FileStream($"{path}{fileName}", FileMode.Create, FileAccess.Write))
                {
                    fs.Write(bytes, 0, bytes.Length);
                    fs.Close();
                }

                lcRetVal = filePath + fileName;
            }
            catch (Exception e)
            {
                typeof(FileUpload).LogError(e);
                lcRetVal += "文件上传异常。";
            }

            return lcRetVal;
        }

        public static string Base64ToPng(this string base64Str, string fileName, string filePath = "/Image")
        {
            string lcRetVal = "error@";
            try
            {
                fileName = $"{fileName}-{DateTime.Now:yyMMddHHmmss}{new Random().Next(1000, 9999)}.png";
                filePath = filePath.StartsWith("/") ? filePath : ("/" + filePath);
                filePath = filePath.EndsWith("/") ? filePath : (filePath + "/");

                string path = $"{AppDomain.CurrentDomain.BaseDirectory}{filePath}";
                if (!Directory.Exists(path))
                    Directory.CreateDirectory(path);
                byte[] bytes = Convert.FromBase64String(base64Str);
                using (MemoryStream ms = new MemoryStream(bytes))
                {
                    var img = Image.FromStream(ms);
                    img.Save($"{path}{fileName}");
                }

                lcRetVal = filePath + fileName;
            }
            catch (Exception e)
            {
                typeof(FileUpload).LogError(e);
                lcRetVal += "文件上传异常。";
            }

            return lcRetVal;
        }

        public static void DeleteFile(this string filePath)
        {
            try
            {
                filePath = filePath.StartsWith("/") ? filePath : ("/" + filePath);
                string path = $"{AppDomain.CurrentDomain.BaseDirectory}{filePath}";
                if (File.Exists(path))
                    File.Delete(path);
            }
            catch
            {
                //
            }
        }

        /// <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>
        public static bool CompressImage(this string sFile, string dFile, int flag = 90, int size = 300, bool sfsc = true)
        {
            //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 && firstFileInfo.Length < size * 1024)
            {
                if (File.Exists(dFile))
                {
                    File.Delete(dFile);
                }
                firstFileInfo.CopyTo(dFile);
                return true;
            }
            Image iSource = Image.FromFile(sFile);
            ImageFormat tFormat = iSource.RawFormat;

            int dHeight = iSource.Height / 2;
            int dWidth = iSource.Width / 2;
            int sW, sH;
            //按比例缩放
            Size temSize = new Size(iSource.Width, iSource.Height);
            if (temSize.Width > dHeight || temSize.Width > dWidth)
            {
                if ((temSize.Width * dHeight) > (temSize.Width * dWidth))
                {
                    sW = dWidth;
                    sH = (dWidth * temSize.Height) / temSize.Width;
                }
                else
                {
                    sH = dHeight;
                    sW = (temSize.Width * dHeight) / temSize.Height;
                }
            }
            else
            {
                sW = temSize.Width;
                sH = temSize.Height;
            }

            //新建第二个bitmap类型的bmp2变量，我这里是根据我的程序需要设置的。
            Bitmap ob = new Bitmap(dWidth, dHeight, PixelFormat.Format16bppRgb555);
            Graphics g = Graphics.FromImage(ob);
            //Bitmap ob = new Bitmap(dWidth, dHeight);
            //Graphics g = Graphics.FromImage(ob);
            g.Clear(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 Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
            g.Dispose();
            //将第一个bmp拷贝到bmp2中
            //Bitmap ob = new Bitmap(bmp.Width, bmp.Height, PixelFormat.Format16bppRgb555);
            //Graphics draw = Graphics.FromImage(ob);
            //draw.DrawImage(bmp, 0, 0);
            //draw.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(Encoder.Quality, qy);
            ep.Param[0] = eParam;

            try
            {
                ImageCodecInfo[] arrayIci = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo jpegIcIinfo = null;
                var ext = GetFileExt(dFile)?.ToUpper();
                foreach (var t in arrayIci)
                {
                    if (t.FormatDescription.Equals(ext))
                    {
                        jpegIcIinfo = t;
                        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;
                        CompressImage(sFile, dFile, flag, size, false);
                    }
                }
                else
                {
                    ob.Save(dFile, tFormat);
                }
                return true;
            }
            catch (Exception e)
            {
                typeof(FileUpload).LogError(e);
                return false;
            }
            finally
            {
                iSource.Dispose();
                //bmp.Dispose();
                ob.Dispose();
            }
        }

        /// <summary>
        /// 无损压缩图片
        /// </summary>
        /// <param name="fileStream">原图片</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>
        public static bool CompressImage(this MemoryStream fileStream, string dFile, int flag = 90, int size = 300, bool sfsc = true)
        {
            //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
            Image iSource = Image.FromStream(fileStream);
            if (sfsc && fileStream.Length < size * 1024)
            {
                iSource.Save(dFile);
                return true;
            }
            ImageFormat tFormat = iSource.RawFormat;

            int dHeight = iSource.Height / 2;
            int dWidth = iSource.Width / 2;
            int sW, sH;
            //按比例缩放
            Size temSize = new Size(iSource.Width, iSource.Height);
            if (temSize.Width > dHeight || temSize.Width > dWidth)
            {
                if ((temSize.Width * dHeight) > (temSize.Width * dWidth))
                {
                    sW = dWidth;
                    sH = (dWidth * temSize.Height) / temSize.Width;
                }
                else
                {
                    sH = dHeight;
                    sW = (temSize.Width * dHeight) / temSize.Height;
                }
            }
            else
            {
                sW = temSize.Width;
                sH = temSize.Height;
            }

            Bitmap ob = new Bitmap(dWidth, dHeight);
            Graphics g = Graphics.FromImage(ob);

            g.Clear(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 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(Encoder.Quality, qy);
            ep.Param[0] = eParam;

            try
            {
                ImageCodecInfo[] arrayIci = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo jpegIcIinfo = null;
                foreach (var t in arrayIci)
                {
                    if (t.FormatDescription.Equals("JPEG"))
                    {
                        jpegIcIinfo = t;
                        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;
                        CompressImage(fileStream, dFile, flag, size, false);
                    }
                }
                else
                {
                    ob.Save(dFile, tFormat);
                }
                return true;
            }
            catch
            {
                return false;
            }
            finally
            {
                iSource.Dispose();
                ob.Dispose();
            }
        }
    }
}