使用SHFILEINFO获取文件图标

穆尔哈夫·索斯利(Murhaf Sousli)

我一直在寻找ac#库,该库获取具有多种尺寸的给定路径的图标,最后,当我确切地得到所需的类时,它有一个问题:

此方法获取给定路径的图标:

public static BitmapSource GetIcon(string FileName, bool small, bool checkDisk, bool addOverlay)
    {
        SHFILEINFO shinfo = new SHFILEINFO();

        uint SHGFI_USEFILEATTRIBUTES = 0x000000010;
        uint SHGFI_LINKOVERLAY = 0x000008000;

        uint flags;
        if (small)
        {
            flags = SHGFI_ICON | SHGFI_SMALLICON;
        }
        else
        {
            flags = SHGFI_ICON | SHGFI_LARGEICON;
        }
        if (!checkDisk)
            flags |= SHGFI_USEFILEATTRIBUTES;
        if (addOverlay)
            flags |= SHGFI_LINKOVERLAY;

        var res = SHGetFileInfo(FileName, 0, ref shinfo, Marshal.SizeOf(shinfo), flags);
        if (res == 0)
        {
            throw (new System.IO.FileNotFoundException());
        }

        var ico = System.Drawing.Icon.FromHandle(shinfo.hIcon); //**Here**

        var bs = BitmapFromIcon(ico);
        ico.Dispose();
        bs.Freeze();
        DestroyIcon(shinfo.hIcon);

        //   CloseHandle(shinfo.hIcon);  it always give exception
        return bs;

    }

public static extern Boolean CloseHandle(IntPtr handle);

上面的代码,因为它是在这个问题上的工作,因为它假定到,但得到的文件路径的图标成功的目录,它给在这条线的异常:
var ico = System.Drawing.Icon.FromHandle(shinfo.hIcon);

An exception of type 'System.IO.FileNotFoundException' occurred in WPF_REMOTE.exe but was not handled in user code

Additional information: Unable to find the specified file.

那么为什么会这样呢? 更新:我发现发生这种情况是因为存在一个包含Unicode字符的路径,而我需要使用SHFILEINFOW来代替,但仍然不知道如何更改SHFILEINFOSHFILEINFOW

关于该行的另一个问题CloseHandle(shinfo.hIcon);总是给出一个例外:

An exception of type 'System.Runtime.InteropServices.SEHException' occurred in WPF_REMOTE.exe but was not handled in user code

Additional information: External component has thrown an exception.

我想知道为什么它不起作用!以及如果没有该方法该方法已经可以工作,为什么还要使用它。

如果您有任何改进,我可以在课堂上告诉我,谢谢。

穆尔哈夫·索斯利(Murhaf Sousli)

编辑一些代码后,您可以从该库中轻松获取图标,在我的情况下,我需要将图标作为字节[]

public class IconHelper
{
    // 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;

    private const int SHIL_JUMBO = 0x4;
    private const int SHIL_EXTRALARGE = 0x2;

    // 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;

    };

    [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
    public static extern Boolean CloseHandle(IntPtr handle);

    private struct IMAGELISTDRAWPARAMS
    {
        public int cbSize;
        public IntPtr himl;
        public int i;
        public IntPtr hdcDst;
        public int x;
        public int y;
        public int cx;
        public int cy;
        public int xBitmap;        // x offest from the upperleft of bitmap
        public int yBitmap;        // y offset from the upperleft of bitmap
        public int rgbBk;
        public int rgbFg;
        public int fStyle;
        public int dwRop;
        public int fState;
        public int Frame;
        public int crEffect;
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct IMAGEINFO
    {
        public IntPtr hbmImage;
        public IntPtr hbmMask;
        public int Unused1;
        public int Unused2;
        public Rect rcImage;
    }
    [DllImport("shell32.dll", EntryPoint = "#727")]
    private extern static int SHGetImageList(
        int iImageList,
        ref Guid riid,
        out IImageList ppv
        );

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

    [DllImport("Shell32.dll", CharSet = CharSet.Unicode)]
    public static extern int SHGetFileInfo(IntPtr pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, int cbFileInfo, uint uFlags);

    [DllImport("shell32.dll", SetLastError = true)]
    static extern int SHGetSpecialFolderLocation(IntPtr hwndOwner, Int32 nFolder,
             ref IntPtr ppidl);

    [DllImport("user32")]
    public static extern int DestroyIcon(IntPtr hIcon);

    public struct pair
    {
        public System.Drawing.Icon icon { get; set; }
        public IntPtr iconHandleToDestroy { set; get; }

    }


    private static byte[] ByteFromIcon(System.Drawing.Icon ic)
    {
        var icon = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(ic.Handle,
                                                System.Windows.Int32Rect.Empty,
                                                System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
        icon.Freeze();
        byte[] data;
        PngBitmapEncoder encoder = new PngBitmapEncoder();
        encoder.Frames.Add(BitmapFrame.Create(icon));
        using (MemoryStream ms = new MemoryStream())
        {
            encoder.Save(ms);
            data = ms.ToArray();
        }
        return data;
    }
private static byte[] GetSmallIcon(string FileName, IconSize iconSize)
    {
        SHFILEINFO shinfo = new SHFILEINFO();
        uint flags;
        if (iconSize == IconSize.Small)
        {
            flags = SHGFI_ICON | SHGFI_SMALLICON;
        }
        else
        {
            flags = SHGFI_ICON | SHGFI_LARGEICON;
        }
        var res = SHGetFileInfo(FileName, 0, ref shinfo, Marshal.SizeOf(shinfo), flags);
        if (res == 0)
        {
            throw (new System.IO.FileNotFoundException());
        }
        var ico = (System.Drawing.Icon)System.Drawing.Icon.FromHandle(shinfo.hIcon);
        var bs = ByteFromIcon(ico);
        ico.Dispose();
        DestroyIcon(shinfo.hIcon);
        return bs;
    }

    private static byte[] GetLargeIcon(string FileName)
    {
        SHFILEINFO shinfo = new SHFILEINFO();
        uint SHGFI_SYSICONINDEX = 0x4000;
        int FILE_ATTRIBUTE_NORMAL = 0x80;
        uint flags;
        flags = SHGFI_SYSICONINDEX;
        var res = SHGetFileInfo(FileName, FILE_ATTRIBUTE_NORMAL, ref shinfo, Marshal.SizeOf(shinfo), flags);
        if (res == 0)
        {
            throw (new System.IO.FileNotFoundException());
        }
        var iconIndex = shinfo.iIcon;
        Guid iidImageList = new Guid("46EB5926-582E-4017-9FDF-E8998DAA0950");
        IImageList iml;
        int size = SHIL_EXTRALARGE;
        var hres = SHGetImageList(size, ref iidImageList, out  iml); // writes iml
        IntPtr hIcon = IntPtr.Zero;
        int ILD_TRANSPARENT = 1;
        hres = iml.GetIcon(iconIndex, ILD_TRANSPARENT, ref hIcon);
        var ico = System.Drawing.Icon.FromHandle(hIcon);
        var bs = ByteFromIcon(ico);
        ico.Dispose();
        DestroyIcon(hIcon);
        return bs;
    }

}

您可以得到四种不同尺寸的图标

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