获取程序图标

问题描述

我正在制作一个类似应用程序的资源管理器来浏览存储在我计算机上的文件.我的应用程序将在图标"视图中.问题是:如何显示一个exe文件的图标?

I'm making a explorer like app to browse files stored on my computer. My app will be in "Icon" view. The question is: How to display the icon of an exe file?

推荐答案

有几种方法可以做到这一点.最简单的方法可能是添加对 System.Drawing 的引用并利用 Icon.ExtractAssociatedIcon 方法:

There are several ways to do that. The easiest is probably to add a reference to System.Drawing and take advantage of the Icon.ExtractAssociatedIcon method:

public static ImageSource GetIcon(string fileName)
{
    Icon icon = Icon.ExtractAssociatedIcon(fileName);
    return System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(
                icon.Handle, 
                new Int32Rect(icon.Width, icon.Height),
                BitmapSizeOptions.FromEmptyOptions());
}

如果您不想使用 System.Drawing，另一种选择是从 SHGetFileInfo API 获取图标.它更难，但也更灵活；例如，您可以根据扩展名获取不存在的文件的图标(当然对于可执行文件来说它不是很有用，因为它会返回可执行文件的默认图标).

Another option, if you don't want to use System.Drawing, is to obtain the icon from the SHGetFileInfo API. It's more difficult, but also much more flexible; for instance you can get the icon of a file that doesn't exist, based on the extension (of course for an executable it's not very useful, since it would return the default icon for executable files).

public static ImageSource GetIcon(string path, bool smallIcon, bool isDirectory)
{
    // SHGFI_USEFILEATTRIBUTES takes the file name and attributes into account if it doesn't exist
    uint flags = SHGFI_ICON | SHGFI_USEFILEATTRIBUTES;
    if (smallIcon)
        flags |= SHGFI_SMALLICON;

    uint attributes = FILE_ATTRIBUTE_NORMAL;
    if (isDirectory)
        attributes |= FILE_ATTRIBUTE_DIRECTORY;

    SHFILEINFO shfi;
    if (0 != SHGetFileInfo(
                path,
                attributes,
                out shfi,
                (uint)Marshal.SizeOf(typeof(SHFILEINFO)),
                flags))
    {
        return System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(
                    shfi.hIcon, 
                    Int32Rect.Empty,
                    BitmapSizeOptions.FromEmptyOptions());
    }
    return null;
}

[StructLayout(LayoutKind.Sequential)]
private struct SHFILEINFO
{
    public IntPtr hIcon;
    public int iIcon;
    public uint dwAttributes;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
    public string szDisplayName;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
    public string szTypeName;
}

    [DllImport("shell32")]
    private static extern int SHGetFileInfo(string pszPath, uint dwFileAttributes, out SHFILEINFO psfi, uint cbFileInfo, uint flags);

private const uint FILE_ATTRIBUTE_READONLY = 0x00000001;
private const uint FILE_ATTRIBUTE_HIDDEN = 0x00000002;
private const uint FILE_ATTRIBUTE_SYSTEM = 0x00000004;
private const uint FILE_ATTRIBUTE_DIRECTORY = 0x00000010;
private const uint FILE_ATTRIBUTE_ARCHIVE = 0x00000020;
private const uint FILE_ATTRIBUTE_DEVICE = 0x00000040;
private const uint FILE_ATTRIBUTE_NORMAL = 0x00000080;
private const uint FILE_ATTRIBUTE_TEMPORARY = 0x00000100;
private const uint FILE_ATTRIBUTE_SPARSE_FILE = 0x00000200;
private const uint FILE_ATTRIBUTE_REPARSE_POINT = 0x00000400;
private const uint FILE_ATTRIBUTE_COMPRESSED = 0x00000800;
private const uint FILE_ATTRIBUTE_OFFLINE = 0x00001000;
private const uint FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000;
private const uint FILE_ATTRIBUTE_ENCRYPTED = 0x00004000;
private const uint FILE_ATTRIBUTE_VIRTUAL = 0x00010000;

private const uint SHGFI_ICON = 0x000000100;     // get icon
private const uint SHGFI_DISPLAYNAME = 0x000000200;     // get display name
private const uint SHGFI_TYPENAME = 0x000000400;     // get type name
private const uint SHGFI_ATTRIBUTES = 0x000000800;     // get attributes
private const uint SHGFI_ICONLOCATION = 0x000001000;     // get icon location
private const uint SHGFI_EXETYPE = 0x000002000;     // return exe type
private const uint SHGFI_SYSICONINDEX = 0x000004000;     // get system icon index
private const uint SHGFI_LINKOVERLAY = 0x000008000;     // put a link overlay on icon
private const uint SHGFI_SELECTED = 0x000010000;     // show icon in selected state
private const uint SHGFI_ATTR_SPECIFIED = 0x000020000;     // get only specified attributes
private const uint SHGFI_LARGEICON = 0x000000000;     // get large icon
private const uint SHGFI_SMALLICON = 0x000000001;     // get small icon
private const uint SHGFI_OPENICON = 0x000000002;     // get open icon
private const uint SHGFI_SHELLICONSIZE = 0x000000004;     // get shell size icon
private const uint SHGFI_PIDL = 0x000000008;     // pszPath is a pidl
private const uint SHGFI_USEFILEATTRIBUTES = 0x000000010;     // use passed dwFileAttribute

这种方法的另一个优点是它还可以获取目录的图标(请参阅代码中的最后一次编辑)，而 Icon.ExtractAssociatedIcon

Another advantage of this approach is that it can also get the icon for a directory (see last edit in the code), which isn't possible with Icon.ExtractAssociatedIcon

这篇关于获取程序图标的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！