直播平臺搭建，實現圖片縮圖功能

直播平臺搭建，實現圖片縮圖功能

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");
        }
    }
}

以上就是直播平臺搭建，實現圖片縮圖功能， 更多內容歡迎關注之後的文章