我现在试图保存图像在pictureBox1到我的硬盘，但它保存它没有矩形在pictureBox1为什么

本文关键字：pictureBox1 保存 为什么 我的 图像 硬盘 | 更新日期: 2023-09-27 18:08:02

if (ImagesComparion1.ImageComparison(File1, file2, image_scan_text_rect) == true)
                                            {
                                               /* Logger.Write("File1 is >>>> " + combinedTemp);
                                                // Logger.Write("File2 is >>>> " + fi.FullName);
                                                Logger.Write("Last File is >>>> " + last_file);
                                                Logger.Write("image_scan_text_rect values are >>>>> " + image_scan_text_rect.ToString());
                                                Logger.Write("ImagesComparion1.ImageComparison(File1, file2, image_scan_text_rect) is now true");*/
                                                if (pictureBox1.Image != null)
                                                {
                                                    pictureBox1.Image.Dispose();
                                                    pictureBox1.Image = null;
                                                }
                                                pictureBox1.Load(last_file);
                                                File1.Dispose();
                                                Properties.Resources.RadarImageClose.Dispose();
                                                label18.Text = "The Radar Is Not Active Now";
                                                label18.Visible = true;
                                                if (paintDemoMode == true)
                                                {
                                                    Bitmap bmp = new Bitmap(combinedTemp);
                                                    Bitmap bb = new Bitmap(bmp);
                                                    bmp.Dispose();
                                                    bmp = null;

                                                    if (pictureBox1.Image != null)
                                                    {
                                                        pictureBox1.Image.Dispose();
                                                        pictureBox1.Image = null;
                                                    }
                                                    pictureBox1.Image = bb;
                                                    image_scan_text_rect = new Rectangle(25, 240, 341, 39);
                                                    float x = ((float)image_scan_text_rect.X / bb.Width) * (float)this.pictureBox1.Width;
                                                    //float y = ((float)Rect.Y / this.pictureBox1.ClientSize.Height) * (float)FirstImage.Height;
                                                    float y = ((float)image_scan_text_rect.Y / bb.Height) * (float)this.pictureBox1.Height;
                                                    //float newRight = ((float)Rect.Right / (float)pictureBox1.ClientSize.Width) * ((float)FirstImage.Width); 
                                                    float newRight = ((float)image_scan_text_rect.Right / bb.Width) * (float)pictureBox1.Width;
                                                    //float newBottom = ((float)Rect.Bottom / (float)pictureBox1.ClientSize.Height) * ((float)FirstImage.Height);
                                                    float newBottom = ((float)image_scan_text_rect.Bottom / bb.Height) * (float)pictureBox1.Height;
                                                    rectToDrawOut = new RectangleF(x, y, newRight - x, newBottom - y);
                                                    pictureBox1.Image.Save(@"d:'testit.png", System.Drawing.Imaging.ImageFormat.Png);
                                                }
                                                return;
                                            }

当我点击一个按钮并且paintDemoMode为true时它会在pictureBox1上显示rectToDrawOut作为矩形

现在我想把现在在pictureBox1中显示的图像保存到我的硬盘，包括矩形。

但是它只有来自pictureBox1的图像，没有矩形。我也试过代替pictureBox1.Image。保存，我试过bb。保存，但还是没有保存矩形。怎么了?

在pictureBox1_Paint事件中，如果需要，我将绘制矩形，下面是代码:

private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            using (Pen pen = new Pen(Color.Red, 2))
            {
                if (paintDemoButtonSwitch == true)
                {
                                        e.Graphics.DrawRectangle(pen, rectToDrawOut.X, rectToDrawOut.Y, rectToDrawOut.Width, rectToDrawOut.Height);
                                    }
            }
        }

我现在试图保存图像在pictureBox1到我的硬盘，但它保存它没有矩形在pictureBox1为什么

您正在屏幕上绘制矩形，其中位图刚刚由控件的常规Paint事件绘制。这不会影响位图。

你可以使用DrawToBitmap方法将控件呈现为位图。这将包括矩形，还将包括控件在渲染图像时所做的缩放/裁剪:

using (Bitmap b = new Bitmap(pictureBox1.Width, pictureBox1.Height)) {
  pictureBox1.DrawToBitmap(b, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
  b.Save(@"d:'testit.png", System.Drawing.Imaging.ImageFormat.Png);
}

这是因为您没有更改图像，而是更改了屏幕的输出。您需要使用

从图像创建一个图形对象
Graphics g = Graphics.FromImage(pictureBox1.Image);

如果你添加一个矩形的图形对象，它应该工作。

编辑:

将保存图像的行替换为:

   Graphics g = Graphics.FromImage(pictureBox1.Image);
   using (Pen pen = new Pen(Color.Red, 2))
      {
         if (paintDemoButtonSwitch == true)
         {
            g.DrawRectangle(pen, rectToDrawOut.X, rectToDrawOut.Y, rectToDrawOut.Width, rectToDrawOut.Height);
         }
   }
   pictureBox1.Image.Save(@"d:'testit.png", System.Drawing.Imaging.ImageFormat.Png);
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