我目前正在制作一个Windows窗体应用程序，我必须实现从.txt（其中写入字节）加载图像并将图像保存为.txt文件。 以下是我的方法：
struct [[nodiscard]] error_info { /* ... */ };
error_info &foo();
void f() { foo(); } // warning not encouraged: not a nodiscard call, because neither
// the (reference) return type nor the function is declared nodiscard
当我尝试读取.txt文件时，有一个＆＃34;参数无效＆＃34;例外情况： public static Image ByteToImage(byte[] byteArrayIn)
{
using (MemoryStream ms = new MemoryStream(byteArrayIn, 0, byteArrayIn.Length))
{
ms.Seek(0, SeekOrigin.Begin);
Image returnImage = System.Drawing.Image.FromStream(ms);
return returnImage;
}
}
private void button3_Click(object sender, EventArgs e)
{
if (byteArr != null)
{
pictureBox1.Image = ByteToImage(byteArr);
}
}
private void button4_Click(object sender, EventArgs e)
{
Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
System.Drawing.Imaging.BitmapData bmpData =
bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, bmp.PixelFormat);
IntPtr ptr = bmpData.Scan0; // adres pierwszej linii
int bytes = Math.Abs(bmpData.Stride) * bmp.Height;
byte[] values = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, values, 0, bytes);
File.WriteAllBytes("file.txt", values);
}
private void ReadBytearrToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog open_file = new OpenFileDialog();
open_file.ShowDialog();
string path = open_file.FileName;
if (File.Exists(path))
{
FileStream fs = new System.IO.FileStream(path, FileMode.Open);
byteArr = new byte[fs.Length];
fs.Position = 0;
fs.Read(byteArr, 0, (int)(fs.Length));
fs.Close();
}
}