c# - 在应用程序中使用 256 x 256 Windows Vista 图标

Question

我有一个应用程序，我为其制作了 256 x 256 Windows Vista 图标。

我想知道如何在用作应用程序图标的 ico 文件中使用 256x256 PNG 文件并将其显示在表单上的图片框中。

我正在使用 VB.NET，但 C# 中的答案很好。我想我可能不得不使用反射。

我不确定这在 Windows XP 中是否可行并且可能需要 Windows Vista API

Answer 1

Today, I made a very nice function for extracting the 256x256 Bitmaps from Vista icons.

Like you, Nathan W, I use it to display the large icon as a Bitmap in "About" box. For example, this code gets Vista icon as PNG image, and displays it in a 256x256 PictureBox:

picboxAppLogo.Image = ExtractVistaIcon(myIcon);

This function takes Icon object as a parameter. So, you can use it with any icons - from resources, from files, from streams, and so on. (Read below about extracting EXE icon).

It runs on any OS, because it does not use any Win32 API, it is 100% managed code :-)

// Based on: http://www.codeproject.com/KB/cs/IconExtractor.aspx
// And a hint from: http://www.codeproject.com/KB/cs/IconLib.aspx

Bitmap ExtractVistaIcon(Icon icoIcon)
{
    Bitmap bmpPngExtracted = null;
    try
    {
        byte[] srcBuf = null;
        using (System.IO.MemoryStream stream = new System.IO.MemoryStream())
            { icoIcon.Save(stream); srcBuf = stream.ToArray(); }
        const int SizeICONDIR = 6;
        const int SizeICONDIRENTRY = 16;
        int iCount = BitConverter.ToInt16(srcBuf, 4);
        for (int iIndex=0; iIndex<iCount; iIndex++)
        {
            int iWidth  = srcBuf[SizeICONDIR + SizeICONDIRENTRY * iIndex];
            int iHeight = srcBuf[SizeICONDIR + SizeICONDIRENTRY * iIndex + 1];
            int iBitCount   = BitConverter.ToInt16(srcBuf, SizeICONDIR + SizeICONDIRENTRY * iIndex + 6);
            if (iWidth == 0 && iHeight == 0 && iBitCount == 32)
            {
                int iImageSize   = BitConverter.ToInt32(srcBuf, SizeICONDIR + SizeICONDIRENTRY * iIndex + 8);
                int iImageOffset = BitConverter.ToInt32(srcBuf, SizeICONDIR + SizeICONDIRENTRY * iIndex + 12);
                System.IO.MemoryStream destStream = new System.IO.MemoryStream();
                System.IO.BinaryWriter writer = new System.IO.BinaryWriter(destStream);
                writer.Write(srcBuf, iImageOffset, iImageSize);
                destStream.Seek(0, System.IO.SeekOrigin.Begin);
                bmpPngExtracted = new Bitmap(destStream); // This is PNG! :)
                break;
            }
        }
    }
    catch { return null; }
    return bmpPngExtracted;
}

IMPORTANT! If you want to load this icon directly from EXE file, then you CAN'T use Icon.ExtractAssociatedIcon(Application.ExecutablePath) as a parameter, because .NET function ExtractAssociatedIcon() is so stupid, it extracts ONLY 32x32 icon!

Instead, you better use the whole IconExtractor class, created by Tsuda Kageyu (http://www.codeproject.com/KB/cs/IconExtractor.aspx). You can slightly simplify this class, to make it smaller. Use IconExtractor this way:

// Getting FILL icon set from EXE, and extracting 256x256 version for logo...
using (TKageyu.Utils.IconExtractor IconEx = new TKageyu.Utils.IconExtractor(Application.ExecutablePath))
{
    Icon icoAppIcon = IconEx.GetIcon(0); // Because standard System.Drawing.Icon.ExtractAssociatedIcon() returns ONLY 32x32.
    picboxAppLogo.Image = ExtractVistaIcon(icoAppIcon);
}

Note: I'm still using my ExtractVistaIcon() function here, because I don't like how IconExtractor handles this job - first, it extracts all icon formats by using IconExtractor.SplitIcon(icoAppIcon), and then you have to know the exact 256x256 icon index to get the desired vista-icon. So, using my ExtractVistaIcon() here is much faster and simplier way :)

Answer 2

在这里找到信息。要获得大的 Vista 图标，您需要使用 Shell32 的 SHGetFileInfo 方法。我已经复制了下面的相关文本，当然您需要将文件名变量替换为“Assembly.GetExecutingAssembly().Location”。

using System.Runtime.InteropServices;

我们将在调用 SHGetFileInfo() 时使用一堆常量来指定我们希望检索的图标的大小：

// Constants that we need in the function call
private const int SHGFI_ICON = 0x100;
private const int SHGFI_SMALLICON = 0x1;
private const int SHGFI_LARGEICON = 0x0;

SHFILEINFO 结构非常重要，因为它将是我们处理各种文件信息的句柄，其中包括图形图标。

// This structure will contain information about the file
public struct SHFILEINFO
{
    // Handle to the icon representing the file
    public IntPtr hIcon;
    // Index of the icon within the image list
    public int iIcon;
    // Various attributes of the file
    public uint dwAttributes;
    // Path to the file
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
    public string szDisplayName;
    // File type
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
    public string szTypeName;
};

非托管代码的最后准备工作是定义 SHGetFileInfo 的签名，该签名位于流行的 Shell32.dll 内：

// The signature of SHGetFileInfo (located in Shell32.dll)
[DllImport("Shell32.dll")]
public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, int cbFileInfo, uint uFlags);

现在我们已经准备好一切，是时候调用函数并显示我们检索到的图标了。将检索的对象是一个图标类型 (System.Drawing.Icon)，但我们希望将其显示在 PictureBox 中，因此我们将使用 ToBitmap() 方法将图标转换为位图。

But first of all there are 3 controls you need to add to the form, a Button btnExtract that has "Extract Icon" for its Text property, picIconSmall which is a PictureBox and a picIconLarge which is also a PictureBox. That's because we will get two icons sizes. Now double click btnExtract in Visual Studio's Design view and you'll get to its Click event. Inside it is the rest of the code:

private void btnExtract_Click(object sender, EventArgs e)
{
    // Will store a handle to the small icon
    IntPtr hImgSmall;
    // Will store a handle to the large icon
    IntPtr hImgLarge;

    SHFILEINFO shinfo = new SHFILEINFO();

    // Open the file that we wish to extract the icon from
    if(openFile.ShowDialog() == DialogResult.OK)
    {
        // Store the file name
        string FileName = openFile.FileName;
        // Sore the icon in this myIcon object
        System.Drawing.Icon myIcon;

        // Get a handle to the small icon
        hImgSmall = SHGetFileInfo(FileName, 0, ref shinfo, Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_SMALLICON);
        // Get the small icon from the handle
        myIcon = System.Drawing.Icon.FromHandle(shinfo.hIcon);
        // Display the small icon
        picIconSmall.Image = myIcon.ToBitmap();

        // Get a handle to the large icon
        hImgLarge = SHGetFileInfo(FileName, 0, ref shinfo, Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_LARGEICON);
        // Get the large icon from the handle
        myIcon = System.Drawing.Icon.FromHandle(shinfo.hIcon);
        // Display the large icon
        picIconLarge.Image = myIcon.ToBitmap();

    }
}

UPDATE: found even more info here.

Answer 3

None of the above answers handle Vista Icons - only small (32x32) and large (48x48)

There is a library that handles Vista Icons here

...it looks quite complicated due to the dual-png alpha channel format.

I will try to make a concise answer in vb .net but it may take some time.

Answer 4

Having the same problem of displaying the 256*256*32 image from an ICO file in a picture box, I found the solution from SAL80 the most efficient one (and almost working). However, the original code doesn't support images stored as BMP (the large icon is usually PNG, but not always...).

Here is my version for future references. The code to create the bitmap is also slightly simpler :

    /// <summary>
    /// Extracts  the large Vista icon from a ICO file 
    /// </summary>
    /// <param name="srcBuf">Bytes of the ICO file</param>
    /// <returns>The large icon or null if not found</returns>
    private static Bitmap ExtractVistaIcon(byte[] srcBuf)
    {
        const int SizeIcondir = 6;
        const int SizeIcondirentry = 16;

        // Read image count from ICO header
        int iCount = BitConverter.ToInt16(srcBuf, 4);

        // Search for a large icon
        for (int iIndex = 0; iIndex < iCount; iIndex++)
        {
            // Read image information from image directory entry
            int iWidth = srcBuf[SizeIcondir + SizeIcondirentry * iIndex];
            int iHeight = srcBuf[SizeIcondir + SizeIcondirentry * iIndex + 1];
            int iBitCount = BitConverter.ToInt16(srcBuf, SizeIcondir + SizeIcondirentry * iIndex + 6);

            // If Vista icon
            if (iWidth == 0 && iHeight == 0 && iBitCount == 32)
            {
                // Get image data position and length from directory
                int iImageSize = BitConverter.ToInt32(srcBuf, SizeIcondir + SizeIcondirentry * iIndex + 8);
                int iImageOffset = BitConverter.ToInt32(srcBuf, SizeIcondir + SizeIcondirentry * iIndex + 12);

                // Check if the image has a PNG signature
                if (srcBuf[iImageOffset] == 0x89 && srcBuf[iImageOffset+1] == 0x50 && srcBuf[iImageOffset+2] == 0x4E && srcBuf[iImageOffset+3] == 0x47)
                {
                    // the PNG data is stored directly in the file
                    var x = new MemoryStream(srcBuf, iImageOffset, iImageSize, false, false);
                    return new Bitmap(x); 
                }

                // Else it's bitmap data with a partial bitmap header
                // Read size from partial header
                int w = BitConverter.ToInt32(srcBuf, iImageOffset + 4);
                // Create a full header
                var b = new Bitmap(w, w, PixelFormat.Format32bppArgb);
                // Copy bits into bitmap
                BitmapData bmpData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.WriteOnly, b.PixelFormat);
                Marshal.Copy(srcBuf, iImageOffset + Marshal.SizeOf(typeof(Bitmapinfoheader)), bmpData.Scan0, b.Width*b.Height*4);
                b.UnlockBits(bmpData);
                return b;
            }
        }

        return null;
    }

Answer 5

Have a look at the Windows icon functions that are available. There's also an overview that mentions querying for different icon sizes. There's a Dream.In.Code forum thread for using the APIs in C# as well as a Pinvoke.net reference.