如何将位图另存为图标? [英] How to save Bitmap as icon?

问题描述

我需要保存从图像文件(.png、.jpeg、.bmp)加载的 Bitmap 对象，并将其作为图标 (.ico) 保存到单独的文件中.

I need to save Bitmap object loaded from image file (.png, .jpeg, .bmp) and save it as an icon (.ico) to a separate file.

首先，我尝试使用 Icon ImageFormat 将 Bitmap 对象保存到文件中:

First I tried saving Bitmap object to a file with Icon ImageFormat:

using System.Drawing;

Bitmap bmp = (Bitmap)pictureBox1.Image;
bmp.Save(@"C:icon.ico", Imaging.ImageFormat.Icon);

这个失败了，因为生成的图标格式不正确，不能用作图标.

This one fails, as the icon produced is not in a proper format and it cannot be used as an icon.

接下来是从 Bitmap 中获取 HIcon 并将其保存到文件中:

Next one was to get HIcon from Bitmap and save it to a file:

using System.Drawing;
using System.IO;

StreamWriter iconWriter = new StreamWriter(@"C:icon.ico");
Icon ico = Icon.FromHandle(((Bitmap)pictureBox1.Image).GetHicon())
ico.Save(iconWriter.BaseStream);
iconWriter.Close();
iconWriter.Dispose();

这个也不行.图标文件虽然写的很好，但是只有16种颜色，宽度和高度有限.

This one does not do the job too. Although icon file is properly written, it has only 16 colors and a limited width and height.

我希望能够编写具有自定义宽度和高度的图标，以保留原始图像的颜色.这可以在 .NET 中实现吗?

I'd like to be able to write icons with custom width and height that would preserve colors from the original image. Is this possible to achive in .NET?

提前致谢.

推荐答案

使用名称空间 System.IO 的工作示例可以是这样的

a working sample using the name space System.IO can be like this

[System.Runtime.InteropServices.DllImport("user32.dll")]
extern static bool DestroyIcon(IntPtr handle);

private void buttonConvert2Ico_Click(object sender, EventArgs e)
{
    OpenFileDialog openFileDialog1 = new OpenFileDialog 

    openFileDialog1.InitialDirectory = "C:\Data\";
    openFileDialog1.Filter = "BitMap(*.bmp)|*.bmp";
    openFileDialog1.FilterIndex = 2;
    openFileDialog1.RestoreDirectory = true;

    if(openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        try
        {
            string sFn = openFileDialog1.FileName;
            MessageBox.Show("Filename=" + sFn);
            string destFileName = sFn.Substring(0, sFn.Length -3) +"ico";

            // Create a Bitmap object from an image file.
            Bitmap bmp = new Bitmap(sFn);

            // Get an Hicon for myBitmap. 
            IntPtr Hicon = bmp.GetHicon();

            // Create a new icon from the handle. 
            Icon newIcon = Icon.FromHandle(Hicon);

            //Write Icon to File Stream
            System.IO.FileStream fs = new System.IO.FileStream(destFileName, System.IO.FileMode.OpenOrCreate);
            newIcon.Save(fs);
            fs.Close();
            DestroyIcon(Hicon);

            //DestroyIcon( hIcon);
            setStatus("Created icon From=" + sFn + ", into " + destFileName);
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error: Could not read/write file. Original error: " + ex.Message);
        }
    }
}

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