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C#实现无损压缩图片的示例详解

作者:芝麻粒儿

这篇文章主要为大家详细介绍了如何利用C#实现无损压缩图片功能,文中的示例代码讲解详细,对我们学习C#有一定的帮助,感兴趣的小伙伴可以了解一下

实践过程

效果

代码

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    FileSystemInfo[] fsi = null;
    string ImgPath = "";
    ArrayList al = new ArrayList();
    string ImgSavePath = "";
    string strSourcePath = "";
    Thread td;
    Image ig = null;
    string strSavePath = "";

    private void Form1_Load(object sender, EventArgs e)
    {
        CheckForIllegalCrossThreadCalls = false;
    }

    /// <summary>
    /// 无损图片缩放
    /// </summary>
    /// <param name="sFile">图片的原始路径</param>
    /// <param name="dFile">缩放后图片的保存路径</param>
    /// <param name="dHeight">缩放后图片的高度</param>
    /// <param name="dWidth">缩放后图片的宽度</param>
    /// <returns></returns>
    public static bool GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth)
    {
        Image iSource = Image.FromFile(sFile);
        ImageFormat tFormat = iSource.RawFormat;
        int sW = 0, sH = 0;
        // 按比例缩放
        Size tem_size = new Size(iSource.Width, iSource.Height);
        if (tem_size.Height > dHeight || tem_size.Width > dWidth)
        {
            if ((tem_size.Width * dHeight) > (tem_size.Height * dWidth))
            {
                sW = dWidth;
                sH = (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(Color.WhiteSmoke);
        // 设置画布的描绘质量
        g.CompositingQuality = CompositingQuality.HighQuality;
        g.SmoothingMode = SmoothingMode.HighQuality;
        g.InterpolationMode = 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] = 100;
        EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
        eP.Param[0] = eParam;
        try
        {
            //获得包含有关内置图像编码解码器的信息的ImageCodecInfo对象。
            ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
            ImageCodecInfo jpegICIinfo = null;
            for (int x = 0; x < arrayICI.Length; x++)
            {
                if (arrayICI[x].FormatDescription.Equals("JPEG"))
                {
                    jpegICIinfo = arrayICI[x]; //设置JPEG编码
                    break;
                }
            }

            if (jpegICIinfo != null)
            {
                oB.Save(dFile, jpegICIinfo, eP);
            }
            else
            {
                oB.Save(dFile, tFormat);
            }

            return true;
        }
        catch
        {
            return false;
        }
        finally
        {
            iSource.Dispose();
            oB.Dispose();
        }
    }

    private void pictureBox1_Click(object sender, EventArgs e)
    {
        if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
        {
            fsi = null;
            al.Clear();
            txtPicPath.Text = folderBrowserDialog1.SelectedPath;
            ImgPath = txtPicPath.Text.Trim();
            DirectoryInfo di = new DirectoryInfo(txtPicPath.Text);
            fsi = di.GetFileSystemInfos();
            for (int i = 0; i < fsi.Length; i++)
            {
                string ofile = fsi[i].ToString();
                string fileType = ofile.Substring(ofile.LastIndexOf(".") + 1, ofile.Length - ofile.LastIndexOf(".") - 1);
                fileType = fileType.ToLower();
                if (fileType == "jpeg" || fileType == "jpg" || fileType == "bmp" || fileType == "png")
                {
                    al.Add(ofile);
                }
            }

            lblPicNum.Text = al.Count.ToString();
        }
    }

    private void pictureBox2_Click(object sender, EventArgs e)
    {
        if (folderBrowserDialog2.ShowDialog() == DialogResult.OK)
        {
            txtSavePath.Text = folderBrowserDialog2.SelectedPath;
            ImgSavePath = txtSavePath.Text.Trim();
        }
    }

    private void button2_Click(object sender, EventArgs e)
    {
        Application.Exit();
    }

    private void rbPercent_Enter(object sender, EventArgs e)
    {
        groupBox1.Focus();
    }

    private void rbResolving_Enter(object sender, EventArgs e)
    {
        groupBox1.Focus();
    }

    private void CompleteIMG()
    {
        progressBar1.Maximum = al.Count;
        progressBar1.Minimum = 1;
        if (ImgPath.Length == 3)
            strSourcePath = ImgPath;
        else
            strSourcePath = ImgPath + "\\";

        if (ImgSavePath.Length == 3)
            strSavePath = ImgSavePath;
        else
            strSavePath = ImgSavePath + "\\";
        for (int i = 0; i < al.Count; i++)
        {
            ig = Image.FromFile(strSourcePath + al[i].ToString());
            if (rbPercent.Checked)
            {
                GetPicThumbnail(strSourcePath + al[i].ToString(), strSavePath + al[i].ToString(), Convert.ToInt32(ig.Width * (numericUpDown1.Value / 100)),
                    Convert.ToInt32(ig.Height * (numericUpDown1.Value / 100)));
            }

            ig.Dispose();
            progressBar1.Value = i + 1;
            lblComplete.Text = Convert.ToString(i + 1);
        }

        if (lblComplete.Text == al.Count.ToString())
        {
            MessageBox.Show("压缩成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            progressBar1.Value = 1;
            pictureBox1.Enabled = true;
            pictureBox2.Enabled = true;
            rbPercent.Enabled = true;
            lblPicNum.Text = "0";
            lblComplete.Text = "0";
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (txtPicPath.Text.Trim() != "" && txtSavePath.Text.Trim() != "" && lblPicNum.Text != "0")
        {
            pictureBox1.Enabled = false;
            pictureBox2.Enabled = false;
            rbPercent.Enabled = false;
            td = new Thread(new ThreadStart(this.CompleteIMG));
            td.Start();
        }
        else
        {
            if (txtPicPath.Text.Trim() == "" && txtSavePath.Text.Trim() == "")
            {
                MessageBox.Show("警告:请选择待处理的图片目录及保存位置", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {
                if (txtPicPath.Text.Trim() == "")
                    MessageBox.Show("警告:请选择待处理的图片", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);
                if (txtSavePath.Text.Trim() == "")
                    MessageBox.Show("警告:请选择保存路径", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }

    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
        if (td != null)
        {
            td.Abort();
        }
    }
}
 partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源,为 true;否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.panel2 = new System.Windows.Forms.Panel();
            this.pictureBox2 = new System.Windows.Forms.PictureBox();
            this.txtSavePath = new System.Windows.Forms.TextBox();
            this.panel1 = new System.Windows.Forms.Panel();
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            this.txtPicPath = new System.Windows.Forms.TextBox();
            this.label2 = new System.Windows.Forms.Label();
            this.label1 = new System.Windows.Forms.Label();
            this.groupBox2 = new System.Windows.Forms.GroupBox();
            this.numericUpDown1 = new System.Windows.Forms.NumericUpDown();
            this.label4 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.rbPercent = new System.Windows.Forms.RadioButton();
            this.groupBox3 = new System.Windows.Forms.GroupBox();
            this.progressBar1 = new System.Windows.Forms.ProgressBar();
            this.label13 = new System.Windows.Forms.Label();
            this.lblComplete = new System.Windows.Forms.Label();
            this.lblPicNum = new System.Windows.Forms.Label();
            this.label8 = new System.Windows.Forms.Label();
            this.label7 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.folderBrowserDialog1 = new System.Windows.Forms.FolderBrowserDialog();
            this.folderBrowserDialog2 = new System.Windows.Forms.FolderBrowserDialog();
            this.groupBox1.SuspendLayout();
            this.panel2.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).BeginInit();
            this.panel1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
            this.groupBox2.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).BeginInit();
            this.groupBox3.SuspendLayout();
            this.SuspendLayout();
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.panel2);
            this.groupBox1.Controls.Add(this.panel1);
            this.groupBox1.Controls.Add(this.label2);
            this.groupBox1.Controls.Add(this.label1);
            this.groupBox1.Location = new System.Drawing.Point(3, 1);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(458, 81);
            this.groupBox1.TabIndex = 0;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "常规";
            // 
            // panel2
            // 
            this.panel2.BackColor = System.Drawing.Color.White;
            this.panel2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.panel2.Controls.Add(this.pictureBox2);
            this.panel2.Controls.Add(this.txtSavePath);
            this.panel2.Location = new System.Drawing.Point(130, 53);
            this.panel2.Name = "panel2";
            this.panel2.Size = new System.Drawing.Size(322, 21);
            this.panel2.TabIndex = 5;
            // 
            // pictureBox2
            // 
            this.pictureBox2.Cursor = System.Windows.Forms.Cursors.PanSE;
            this.pictureBox2.Image = global::CompressImg.Properties.Resources.文件夹打开;
            this.pictureBox2.Location = new System.Drawing.Point(300, 0);
            this.pictureBox2.Name = "pictureBox2";
            this.pictureBox2.Size = new System.Drawing.Size(19, 18);
            this.pictureBox2.TabIndex = 8;
            this.pictureBox2.TabStop = false;
            this.pictureBox2.Click += new System.EventHandler(this.pictureBox2_Click);
            // 
            // txtSavePath
            // 
            this.txtSavePath.BackColor = System.Drawing.Color.White;
            this.txtSavePath.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.txtSavePath.Location = new System.Drawing.Point(0, 1);
            this.txtSavePath.Name = "txtSavePath";
            this.txtSavePath.ReadOnly = true;
            this.txtSavePath.Size = new System.Drawing.Size(302, 14);
            this.txtSavePath.TabIndex = 1;
            // 
            // panel1
            // 
            this.panel1.BackColor = System.Drawing.Color.White;
            this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.panel1.Controls.Add(this.pictureBox1);
            this.panel1.Controls.Add(this.txtPicPath);
            this.panel1.Location = new System.Drawing.Point(130, 23);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(322, 21);
            this.panel1.TabIndex = 4;
            // 
            // pictureBox1
            // 
            this.pictureBox1.Cursor = System.Windows.Forms.Cursors.PanSE;
            this.pictureBox1.Image = global::CompressImg.Properties.Resources.文件夹打开;
            this.pictureBox1.Location = new System.Drawing.Point(300, 0);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(19, 18);
            this.pictureBox1.TabIndex = 8;
            this.pictureBox1.TabStop = false;
            this.pictureBox1.Click += new System.EventHandler(this.pictureBox1_Click);
            // 
            // txtPicPath
            // 
            this.txtPicPath.BackColor = System.Drawing.Color.White;
            this.txtPicPath.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.txtPicPath.Location = new System.Drawing.Point(0, 1);
            this.txtPicPath.Name = "txtPicPath";
            this.txtPicPath.ReadOnly = true;
            this.txtPicPath.Size = new System.Drawing.Size(302, 14);
            this.txtPicPath.TabIndex = 1;
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(7, 57);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(125, 12);
            this.label2.TabIndex = 2;
            this.label2.Text = "处理后的图片保存至:";
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(8, 28);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(125, 12);
            this.label1.TabIndex = 0;
            this.label1.Text = "等待处理的图片位置:";
            // 
            // groupBox2
            // 
            this.groupBox2.Controls.Add(this.numericUpDown1);
            this.groupBox2.Controls.Add(this.label4);
            this.groupBox2.Controls.Add(this.label3);
            this.groupBox2.Controls.Add(this.rbPercent);
            this.groupBox2.Location = new System.Drawing.Point(3, 86);
            this.groupBox2.Name = "groupBox2";
            this.groupBox2.Size = new System.Drawing.Size(458, 47);
            this.groupBox2.TabIndex = 1;
            this.groupBox2.TabStop = false;
            this.groupBox2.Text = "改变大小";
            // 
            // numericUpDown1
            // 
            this.numericUpDown1.Location = new System.Drawing.Point(188, 17);
            this.numericUpDown1.Maximum = new decimal(new int[] {
            200,
            0,
            0,
            0});
            this.numericUpDown1.Minimum = new decimal(new int[] {
            1,
            0,
            0,
            0});
            this.numericUpDown1.Name = "numericUpDown1";
            this.numericUpDown1.Size = new System.Drawing.Size(40, 21);
            this.numericUpDown1.TabIndex = 8;
            this.numericUpDown1.Value = new decimal(new int[] {
            50,
            0,
            0,
            0});
            // 
            // label4
            // 
            this.label4.AutoSize = true;
            this.label4.Location = new System.Drawing.Point(234, 22);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(11, 12);
            this.label4.TabIndex = 4;
            this.label4.Text = "%";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(92, 22);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(89, 12);
            this.label3.TabIndex = 2;
            this.label3.Text = "改成原图大小的";
            // 
            // rbPercent
            // 
            this.rbPercent.AutoSize = true;
            this.rbPercent.Checked = true;
            this.rbPercent.Location = new System.Drawing.Point(10, 20);
            this.rbPercent.Name = "rbPercent";
            this.rbPercent.Size = new System.Drawing.Size(71, 16);
            this.rbPercent.TabIndex = 0;
            this.rbPercent.TabStop = true;
            this.rbPercent.Text = "按百分比";
            this.rbPercent.UseVisualStyleBackColor = true;
            this.rbPercent.Enter += new System.EventHandler(this.rbPercent_Enter);
            // 
            // groupBox3
            // 
            this.groupBox3.Controls.Add(this.progressBar1);
            this.groupBox3.Controls.Add(this.label13);
            this.groupBox3.Controls.Add(this.lblComplete);
            this.groupBox3.Controls.Add(this.lblPicNum);
            this.groupBox3.Controls.Add(this.label8);
            this.groupBox3.Controls.Add(this.label7);
            this.groupBox3.Location = new System.Drawing.Point(3, 139);
            this.groupBox3.Name = "groupBox3";
            this.groupBox3.Size = new System.Drawing.Size(458, 85);
            this.groupBox3.TabIndex = 9;
            this.groupBox3.TabStop = false;
            this.groupBox3.Text = "操作显示";
            // 
            // progressBar1
            // 
            this.progressBar1.Location = new System.Drawing.Point(107, 54);
            this.progressBar1.Name = "progressBar1";
            this.progressBar1.Size = new System.Drawing.Size(302, 18);
            this.progressBar1.Step = 1;
            this.progressBar1.TabIndex = 16;
            // 
            // label13
            // 
            this.label13.AutoSize = true;
            this.label13.Location = new System.Drawing.Point(42, 57);
            this.label13.Name = "label13";
            this.label13.Size = new System.Drawing.Size(53, 12);
            this.label13.TabIndex = 15;
            this.label13.Text = "处理进度";
            // 
            // lblComplete
            // 
            this.lblComplete.AutoSize = true;
            this.lblComplete.Location = new System.Drawing.Point(339, 25);
            this.lblComplete.Name = "lblComplete";
            this.lblComplete.Size = new System.Drawing.Size(11, 12);
            this.lblComplete.TabIndex = 12;
            this.lblComplete.Text = "0";
            // 
            // lblPicNum
            // 
            this.lblPicNum.AutoSize = true;
            this.lblPicNum.Location = new System.Drawing.Point(149, 26);
            this.lblPicNum.Name = "lblPicNum";
            this.lblPicNum.Size = new System.Drawing.Size(11, 12);
            this.lblPicNum.TabIndex = 11;
            this.lblPicNum.Text = "0";
            // 
            // label8
            // 
            this.label8.AutoSize = true;
            this.label8.Location = new System.Drawing.Point(255, 26);
            this.label8.Name = "label8";
            this.label8.Size = new System.Drawing.Size(77, 12);
            this.label8.TabIndex = 10;
            this.label8.Text = "已经处理成功";
            // 
            // label7
            // 
            this.label7.AutoSize = true;
            this.label7.Location = new System.Drawing.Point(42, 26);
            this.label7.Name = "label7";
            this.label7.Size = new System.Drawing.Size(101, 12);
            this.label7.TabIndex = 9;
            this.label7.Text = "待处理的图片共有";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(305, 230);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 10;
            this.button1.Text = "开始压缩";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(386, 230);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(75, 23);
            this.button2.TabIndex = 11;
            this.button2.Text = "取消";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(463, 261);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.groupBox3);
            this.Controls.Add(this.groupBox2);
            this.Controls.Add(this.groupBox1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "无损压缩图片";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.FormClosed += new System.Windows.Forms.FormClosedEventHandler(this.Form1_FormClosed);
            this.groupBox1.ResumeLayout(false);
            this.groupBox1.PerformLayout();
            this.panel2.ResumeLayout(false);
            this.panel2.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).EndInit();
            this.panel1.ResumeLayout(false);
            this.panel1.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
            this.groupBox2.ResumeLayout(false);
            this.groupBox2.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).EndInit();
            this.groupBox3.ResumeLayout(false);
            this.groupBox3.PerformLayout();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.TextBox txtPicPath;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.GroupBox groupBox2;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.RadioButton rbPercent;
        private System.Windows.Forms.GroupBox groupBox3;
        private System.Windows.Forms.Label label13;
        private System.Windows.Forms.Label lblComplete;
        private System.Windows.Forms.Label lblPicNum;
        private System.Windows.Forms.Label label8;
        private System.Windows.Forms.Label label7;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Panel panel1;
        private System.Windows.Forms.PictureBox pictureBox1;
        private System.Windows.Forms.Panel panel2;
        private System.Windows.Forms.PictureBox pictureBox2;
        private System.Windows.Forms.TextBox txtSavePath;
        private System.Windows.Forms.ProgressBar progressBar1;
        private System.Windows.Forms.FolderBrowserDialog folderBrowserDialog1;
        private System.Windows.Forms.FolderBrowserDialog folderBrowserDialog2;
        private System.Windows.Forms.NumericUpDown numericUpDown1;
    }

到此这篇关于C#实现无损压缩图片的示例详解的文章就介绍到这了,更多相关C#无损压缩图片内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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