在C#中保存图像

本文关键字:图像 保存 | 更新日期: 2023-09-27 18:21:56

我有一段代码应该保存一张图片(位图),但它没有保存,每次都会抛出异常,这是怎么回事?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.IO;
namespace PicConv {
    public partial class Form1 : Form {
        Bitmap bmp;
        Bitmap bmp2;
        public Form1() {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e) {
            for (int y = 0; y < bmp.Height; y++) {
                for (int x = 0; x < bmp.Width; x++) {
                    Color c = bmp2.GetPixel(x, y);
                    byte r = c.R;
                    byte g = c.G;
                    byte b = c.B;
                    byte I = (byte)(0.3 * r + 0.59 * g + 0.11 * b);
                    Color c1 = Color.FromArgb(I, I, I);
                    bmp2.SetPixel(x, y, c1);
                }
            }
            pictureBox2.Image = bmp2;
            pictureBox2.SizeMode = PictureBoxSizeMode.StretchImage;
        }
        private void pictureBox1_Click(object sender, EventArgs e) {
            bmp = new Bitmap(@"C:'pic.bmp");
            pictureBox1.Image = bmp;
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
            bmp2 = (Bitmap)bmp.Clone();
        }
        private void button2_Click(object sender, EventArgs e) {
            try {
                if (bmp2 != null) {
                    bmp2.Save(@"c:'test.bmp"); // <- this throws an exception every time and won't save anything
                }
            } catch (Exception ex) {
                MessageBox.Show("Error: " + ex.Message);
            }
        }
    }
}

我让它弹出一个消息框窗口,告诉我错误是什么,上面写着"GDI+中发生了一个通用错误"。

在C#中保存图像

尝试更改加载图像的方式

using(FileStream fs = new FileStream(@"C:'temp'pic.bmp", FileMode.Open, FileAccess.Read))
{
    MemoryStream ms = new MemoryStream();
    fs.CopyTo(ms);
    ms.Seek(0, System.IO.SeekOrigin.Begin);
    bmp = (Bitmap)System.Drawing.Image.FromStream(ms);
}
pictureBox1.Image = bmp;
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
bmp2 = (Bitmap)bmp.Clone();

请注意,这可能与您的问题无关,但最好避免在系统驱动器的根目录中写入。通常,此位置需要提升访问权限。

尝试将其保存到文件夹中,而不仅仅是C:。否则,我认为您需要使用管理员权限运行。