C#实现无损压缩图片的示例详解
目录
- 实践过程
- 效果
- 代码
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 sende编程r, 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.Locajavascripttion = 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.Popythonint(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; 编程 // // 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.lblPicNpythonum.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); 开发者_C教程 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; }
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