如何使用Windows shell获取文件扩展名的大图标？

我找到了关于获取文件甚至文件扩展名的系统映像的各种文章。 我有以下方法，用于获取小型16×16和大型32×32图像。

// DLL Import [DllImport("shell32")] private static extern IntPtr SHGetFileInfo( string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbFileInfo, uint uFlags); // Constants/Enums private const int FILE_ATTRIBUTE_NORMAL = 0x80; private enum SHGetFileInfoConstants : int { SHGFI_ICON = 0x100, // get icon SHGFI_DISPLAYNAME = 0x200, // get display name SHGFI_TYPENAME = 0x400, // get type name SHGFI_ATTRIBUTES = 0x800, // get attributes SHGFI_ICONLOCATION = 0x1000, // get icon location SHGFI_EXETYPE = 0x2000, // return exe type SHGFI_SYSICONINDEX = 0x4000, // get system icon index SHGFI_LINKOVERLAY = 0x8000, // put a link overlay on icon SHGFI_SELECTED = 0x10000, // show icon in selected state SHGFI_ATTR_SPECIFIED = 0x20000, // get only specified attributes SHGFI_LARGEICON = 0x0, // get large icon SHGFI_SMALLICON = 0x1, // get small icon SHGFI_OPENICON = 0x2, // get open icon SHGFI_SHELLICONSIZE = 0x4, // get shell size icon SHGFI_PIDL = 0x8, // pszPath is a pidl SHGFI_USEFILEATTRIBUTES = 0x10, // use passed dwFileAttribute SHGFI_ADDOVERLAYS = 0x000000020, // apply the appropriate overlays SHGFI_OVERLAYINDEX = 0x000000040 // Get the index of the overlay } public static Icon GetSmallIconForExtension(string extension) { // Get the small icon and clone it, as we MUST destroy the handle when we are done. SHFILEINFO shinfo = new SHFILEINFO(); IntPtr ptr = SHGetFileInfo( extension, FILE_ATTRIBUTE_NORMAL, ref shinfo, (uint)Marshal.SizeOf(shinfo), (int)(SHGetFileInfoConstants.SHGFI_ICON | SHGetFileInfoConstants.SHGFI_SMALLICON | SHGetFileInfoConstants.SHGFI_USEFILEATTRIBUTES | SHGetFileInfoConstants.SHGFI_TYPENAME)); Icon icon = Icon.FromHandle(shinfo.hIcon).Clone() as Icon; DestroyIcon(shinfo.hIcon); return icon; } public static Icon GetLargeIconForExtension(string extension) { // Get the small icon and clone it, as we MUST destroy the handle when we are done. SHFILEINFO shinfo = new SHFILEINFO(); IntPtr ptr = SHGetFileInfo( extension, FILE_ATTRIBUTE_NORMAL, ref shinfo, (uint)Marshal.SizeOf(shinfo), (int)( SHGetFileInfoConstants.SHGFI_ICON | SHGetFileInfoConstants.SHGFI_LARGEICON | SHGetFileInfoConstants.SHGFI_USEFILEATTRIBUTES | SHGetFileInfoConstants.SHGFI_TYPENAME )); Icon icon = Icon.FromHandle(shinfo.hIcon).Clone() as Icon; DestroyIcon(shinfo.hIcon); return icon; } 

从上述方法之一获取图标后，我将其转换为位图，如下所示：

 Image image = icon.ToBitmap(); 

在上面指定SHGetFileInfoConstants.SHGFI_LARGEICON时，我得到32×32大小的位图图像。 但是，在Windows资源管理器中，当您选择查看Medium Icons图标时，您将获得48×48大小的图标。

我想要48×48大小的图标（不是32×32）。 我需要做什么？

Answer 1

shell图标的大小在SHGetImageList的文档中SHGetImageList ：

• 16×16 =小
• 32×32 =大
• 48×48 = extralarge
• 256×256 = jumbo

所以当你要求“大”图标时，你会得到32×32。 如果你想要超大图标，你需要从SHIL_EXTRALARGE图像列表中获取它们。