直播平台搭建，实现图片缩略图功能

直播平台搭建，实现图片缩略图功能

 

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public partial class Form1 : Form<br>{<br>    public Form1()<br>    {<br>        InitializeComponent();<br>    }<br>    public Image ResourceImage;<br>    private int ImageWidth;<br>    private int ImageHeight;<br>    public string ErrMessage;<br>    public bool ThumbnailCallback()<br>    {<br>        return false;<br>    }<br>    public bool GetReducedImage(double Percent, string targetFilePath)<br>    {<br>        try<br>        {<br>            Bitmap bt = new Bitmap(120, 120);<br>            Graphics g = Graphics.FromImage(bt);<br>            g.Clear(Color.White);<br>            Image ReducedImage;<br>            Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);<br>            ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);<br>            ImageHeight = Convert.ToInt32(ResourceImage.Height * Percent);<br>            ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);<br>            if (ImageWidth > ImageHeight)<br>            {<br>                g.DrawImage(ReducedImage, 0, (int) (120 - ImageHeight) / 2, ImageWidth, ImageHeight);<br>            }<br>            else<br>            {<br>                g.DrawImage(ReducedImage, (int) (120 - ImageWidth) / 2, 0, ImageWidth, ImageHeight);<br>            }<br>            g.DrawRectangle(new Pen(Color.Gainsboro), 0, 0, 119, 119);<br>            bt.Save(@targetFilePath, ImageFormat.Jpeg);<br>            bt.Dispose();<br>            ReducedImage.Dispose();<br>            return true;<br>        }<br>        catch (Exception e)<br>        {<br>            ErrMessage = e.Message;<br>            return false;<br>        }<br>    }<br>    private void button1_Click(object sender, EventArgs e)<br>    {<br>        if (openFileDialog1.ShowDialog() == DialogResult.OK)<br>        {<br>            pictureBox1.Image = Image.FromFile(openFileDialog1.FileName);<br>        }<br>    }<br>    private void button2_Click(object sender, EventArgs e)<br>    {<br>        double percent;<br>        string imgpath = openFileDialog1.FileName;<br>        string imgName = imgpath.ToString().Substring(imgpath.ToString().LastIndexOf("\\") + 1,<br>            imgpath.ToString().Length - 1 - imgpath.ToString().LastIndexOf("\\"));<br>        imgName = imgName.Remove(imgName.LastIndexOf("."));<br>        if (openFileDialog1.FileName.Length != 0)<br>        {<br>            ResourceImage = Image.FromFile(openFileDialog1.FileName);<br>            if (ResourceImage.Width < ResourceImage.Height)<br>            {<br>                percent = (double) 120 / ResourceImage.Height;<br>            }<br>            else<br>            {<br>                percent = (double) 120 / ResourceImage.Width;<br>            }<br>            GetReducedImage(percent, "c:\\_" + imgName + ".JPG");<br>            pictureBox2.Image = Image.FromFile("c:\\_" + imgName + ".JPG");<br>        }<br>    }<br>}

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