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   源码介绍

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用户有上传本地图片的需求,但是服务器对图片的格式和尺寸有要求,用户冒然上传会不成功,做个小工具,注册后在图片上点击鼠标右键,在弹出的菜单里有格式转换的选项,一键转换为符合要求的图片格式,支持多选.

/// <summary>
        /// 转换
        /// </summary>
        private void PictureConvert()
        {
            //转换
            if (this.lvwPictureFile.Items.Count > 0)
            {
                bool _RunFlag = true;
                foreach (ListViewItem _lvi in this.lvwPictureFile.Items)
                {
                    //MessageBox.Show(Convert.ToString(_lvi.SubItems[0].Text));

                    if (_lvi.Text == "等待转换")
                    {
                        try
                        {
                            //定义输入文件
                            string LoadFile = _lvi.SubItems[1].Text;

                            //定义输出文件（分离全文件名）
                            string[] _Item = LoadFile.Split('\\');
                            string _FileItem = _Item[_Item.Length - 1];
                            string LoadPath = "";
                            for (int _i = 0; _i < _Item.Length - 1; _i )
                            {
                                if (LoadPath == "")
                                {
                                    LoadPath = _Item[_i];
                                }
                                else
                                {
                                    LoadPath = LoadPath "\\" _Item[_i];
                                }
                            }
                            //定义输出文件（分离文件名和扩展名）
                            string[] _SubItem = _FileItem.Split('.');
                            string FileItemMain = "";
                            for (int _i = 0; _i < _SubItem.Length - 1; _i )
                            {
                                if (FileItemMain == "")
                                {
                                    FileItemMain = _SubItem[_i];
                                }
                                else
                                {
                                    FileItemMain = FileItemMain "." _SubItem[_i];
                                }
                            }
                            //组合输出文件
                            string SaveFile = LoadPath "\\（反假）" FileItemMain ".jpg";

                            //装入源文件
                            Bitmap SrcImage = new Bitmap(LoadFile);
                            //循环降低照片分辨率从而找到适合的容量
                            double FileLength = 1024 * 1024 * 2;
                            for (float _i = 1f; _i > 0.1f; _i = _i - 0.1f)
                            {
                                //定义新的图片尺寸及图片对象
                                int DestWidth = (int)(SrcImage.Width * _i);
                                int DestHeight = (int)(SrcImage.Height * _i);
                                Bitmap DestImage = new Bitmap(DestWidth, DestHeight);
                                //进行图片转换
                                Graphics _Graphics = Graphics.FromImage(DestImage);
                                //将源图像画到画布上，注意最后一个参数GraphicsUnit.Pixel
                                _Graphics.DrawImage(SrcImage, new Rectangle(0, 0, DestWidth, DestHeight), new Rectangle(0, 0, SrcImage.Width, SrcImage.Height), GraphicsUnit.Pixel);
                                //设置压缩//设置压缩质量为level 75
                                EncoderParameters _EncoderParameters = new EncoderParameters();
                                _EncoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 75L);
                                //获取指定mimeType的ImageCodecInfo
                                ImageCodecInfo _ImageCodecInfo = ImageCodecInfo.GetImageEncoders().FirstOrDefault(ici => ici.MimeType == "image/jpeg");
                                //获取转换后的图片大小
                                MemoryStream _MemoryStream = new MemoryStream();
                                DestImage.Save(_MemoryStream, _ImageCodecInfo, _EncoderParameters);                            //判断图片大小
                                if (_MemoryStream.Length < FileLength)
                                {
                                    //DestImage.Save(SaveFile, ImageFormat.Jpeg);
                                    DestImage.Save(SaveFile, _ImageCodecInfo, _EncoderParameters);
                                    //MessageBox.Show("转换完毕!");
                                    _lvi.ImageIndex = 1;
                                    _lvi.Text = "转换完毕";

                                    break;
                                }
                            }
                        }
                        catch (Exception)
                        {
                            //MessageBox.Show("软件不支持的图片格式!请联系客服人员");
                            _lvi.ImageIndex = 0;
                            _lvi.Text = "不支持的图片格式";
                            _RunFlag = false;
                        }
                    }
                }
                if (_RunFlag == false)
                {
                    MessageBox.Show("遇到不支持的图片格式!请联系客服人员", "失败", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }

            }
        }