C#實(shí)現(xiàn)圖片縮略圖功能的示例詳解
更新時間:2022年12月23日 08:55:06 作者:芝麻粒兒
這篇文章主要為大家詳細(xì)介紹了如何利用C#實(shí)現(xiàn)圖片縮略圖的功能,文中的示例代碼講解詳細(xì),對我們學(xué)習(xí)C#有一定的幫助,感興趣的小伙伴可以跟隨小編一起了解一下
實(shí)踐過程
效果
代碼
public partial class Form1 : Form { public Form1() { InitializeComponent(); } public Image ResourceImage; private int ImageWidth; private int ImageHeight; public string ErrMessage; public bool ThumbnailCallback() { return false; } public bool GetReducedImage(double Percent, string targetFilePath) { try { Bitmap bt = new Bitmap(120, 120); Graphics g = Graphics.FromImage(bt); g.Clear(Color.White); Image ReducedImage; Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback); ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent); ImageHeight = Convert.ToInt32(ResourceImage.Height * Percent); ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero); if (ImageWidth > ImageHeight) { g.DrawImage(ReducedImage, 0, (int) (120 - ImageHeight) / 2, ImageWidth, ImageHeight); } else { g.DrawImage(ReducedImage, (int) (120 - ImageWidth) / 2, 0, ImageWidth, ImageHeight); } g.DrawRectangle(new Pen(Color.Gainsboro), 0, 0, 119, 119); bt.Save(@targetFilePath, ImageFormat.Jpeg); bt.Dispose(); ReducedImage.Dispose(); return true; } catch (Exception e) { ErrMessage = e.Message; return false; } } private void button1_Click(object sender, EventArgs e) { if (openFileDialog1.ShowDialog() == DialogResult.OK) { pictureBox1.Image = Image.FromFile(openFileDialog1.FileName); } } private void button2_Click(object sender, EventArgs e) { double percent; string imgpath = openFileDialog1.FileName; string imgName = imgpath.ToString().Substring(imgpath.ToString().LastIndexOf("\\") + 1, imgpath.ToString().Length - 1 - imgpath.ToString().LastIndexOf("\\")); imgName = imgName.Remove(imgName.LastIndexOf(".")); if (openFileDialog1.FileName.Length != 0) { ResourceImage = Image.FromFile(openFileDialog1.FileName); if (ResourceImage.Width < ResourceImage.Height) { percent = (double) 120 / ResourceImage.Height; } else { percent = (double) 120 / ResourceImage.Width; } GetReducedImage(percent, "c:\\_" + imgName + ".JPG"); pictureBox2.Image = Image.FromFile("c:\\_" + imgName + ".JPG"); } } }
partial class Form1 { /// <summary> /// 必需的設(shè)計(jì)器變量。 /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// 清理所有正在使用的資源。 /// </summary> /// <param name="disposing">如果應(yīng)釋放托管資源,為 true;否則為 false。</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows 窗體設(shè)計(jì)器生成的代碼 /// <summary> /// 設(shè)計(jì)器支持所需的方法 - 不要 /// 使用代碼編輯器修改此方法的內(nèi)容。 /// </summary> private void InitializeComponent() { this.pictureBox1 = new System.Windows.Forms.PictureBox(); this.pictureBox2 = new System.Windows.Forms.PictureBox(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog(); ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit(); ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).BeginInit(); this.SuspendLayout(); // // pictureBox1 // this.pictureBox1.Location = new System.Drawing.Point(11, 42); this.pictureBox1.Name = "pictureBox1"; this.pictureBox1.Size = new System.Drawing.Size(262, 232); this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom; this.pictureBox1.TabIndex = 0; this.pictureBox1.TabStop = false; // // pictureBox2 // this.pictureBox2.Location = new System.Drawing.Point(305, 80); this.pictureBox2.Name = "pictureBox2"; this.pictureBox2.Size = new System.Drawing.Size(155, 132); this.pictureBox2.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom; this.pictureBox2.TabIndex = 1; this.pictureBox2.TabStop = false; // // button1 // this.button1.Location = new System.Drawing.Point(11, 13); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(75, 23); this.button1.TabIndex = 2; this.button1.Text = "選擇圖片"; this.button1.UseVisualStyleBackColor = true; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(93, 12); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(75, 23); this.button2.TabIndex = 3; this.button2.Text = "顯示縮略圖"; this.button2.UseVisualStyleBackColor = true; this.button2.Click += new System.EventHandler(this.button2_Click); // // openFileDialog1 // this.openFileDialog1.Filter = "圖片文件|*.jpg;*.jpeg;*.bmp;*.png"; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(487, 296); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.pictureBox2); this.Controls.Add(this.pictureBox1); this.Name = "Form1"; this.Text = "Form1"; ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit(); ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).EndInit(); this.ResumeLayout(false); } #endregion private System.Windows.Forms.PictureBox pictureBox1; private System.Windows.Forms.PictureBox pictureBox2; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private System.Windows.Forms.OpenFileDialog openFileDialog1; }
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