Last active
August 11, 2024 14:05
-
-
Save bruceburge/adc84840920ed262669353dd64ffd9f2 to your computer and use it in GitHub Desktop.
Single file example of how to extract a higher resolution (256x256) png from windows file extension, note for this to compile, "allow unsafe code" flag will have to be checked [credit to : http://stackoverflow.com/a/28530403/1572750]
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| using System; | |
| using System.Runtime.InteropServices; | |
| using System.Drawing; | |
| using System.Drawing.Imaging; | |
| namespace ExtractPngOfExtIcon | |
| { | |
| class Program | |
| { | |
| //Working example as of 2017/05/19 on windows 10 x64 | |
| //example found here. | |
| //http://stackoverflow.com/a/28530403/1572750 | |
| public static void Main(string[] args) | |
| { | |
| var ext = "cs"; | |
| IntPtr hIcon = GetJumboIcon(GetIconIndex("*." + ext)); | |
| // from native to managed | |
| using (Icon ico = (Icon)Icon.FromHandle(hIcon).Clone()) | |
| { | |
| // save to file (or show in a picture box) | |
| ico.ToBitmap().Save(ext + "icon.png", ImageFormat.Png); | |
| } | |
| Shell32.DestroyIcon(hIcon); // don't forget to cleanup | |
| } | |
| static int GetIconIndex(string pszFile) | |
| { | |
| SHFILEINFO sfi = new SHFILEINFO(); | |
| Shell32.SHGetFileInfo(pszFile | |
| , 0 | |
| , ref sfi | |
| , (uint)System.Runtime.InteropServices.Marshal.SizeOf(sfi) | |
| , (uint)(SHGFI.SysIconIndex | SHGFI.LargeIcon | SHGFI.UseFileAttributes)); | |
| return sfi.iIcon; | |
| } | |
| // 256*256 | |
| static IntPtr GetJumboIcon(int iImage) | |
| { | |
| IImageList spiml = null; | |
| Guid guil = new Guid(IID_IImageList2);//or IID_IImageList | |
| Shell32.SHGetImageList(Shell32.SHIL_JUMBO, ref guil, ref spiml); | |
| IntPtr hIcon = IntPtr.Zero; | |
| spiml.GetIcon(iImage, Shell32.ILD_TRANSPARENT | Shell32.ILD_IMAGE, ref hIcon); | |
| return hIcon; | |
| } | |
| const string IID_IImageList = "46EB5926-582E-4017-9FDF-E8998DAA0950"; | |
| const string IID_IImageList2 = "192B9D83-50FC-457B-90A0-2B82A8B5DAE1"; | |
| public static class Shell32 | |
| { | |
| public const int SHIL_LARGE = 0x0; | |
| public const int SHIL_SMALL = 0x1; | |
| public const int SHIL_EXTRALARGE = 0x2; | |
| public const int SHIL_SYSSMALL = 0x3; | |
| public const int SHIL_JUMBO = 0x4; | |
| public const int SHIL_LAST = 0x4; | |
| public const int ILD_TRANSPARENT = 0x00000001; | |
| public const int ILD_IMAGE = 0x00000020; | |
| [DllImport("shell32.dll", EntryPoint = "#727")] | |
| public extern static int SHGetImageList(int iImageList, ref Guid riid, ref IImageList ppv); | |
| [DllImport("user32.dll", EntryPoint = "DestroyIcon", SetLastError = true)] | |
| public static unsafe extern int DestroyIcon(IntPtr hIcon); | |
| [DllImport("shell32.dll")] | |
| public static extern uint SHGetIDListFromObject([MarshalAs(UnmanagedType.IUnknown)] object iUnknown, out IntPtr ppidl); | |
| [DllImport("Shell32.dll")] | |
| public static extern IntPtr SHGetFileInfo( | |
| string pszPath, | |
| uint dwFileAttributes, | |
| ref SHFILEINFO psfi, | |
| uint cbFileInfo, | |
| uint uFlags | |
| ); | |
| } | |
| [Flags] | |
| enum SHGFI : uint | |
| { | |
| /// <summary>get icon</summary> | |
| Icon = 0x000000100, | |
| /// <summary>get display name</summary> | |
| DisplayName = 0x000000200, | |
| /// <summary>get type name</summary> | |
| TypeName = 0x000000400, | |
| /// <summary>get attributes</summary> | |
| Attributes = 0x000000800, | |
| /// <summary>get icon location</summary> | |
| IconLocation = 0x000001000, | |
| /// <summary>return exe type</summary> | |
| ExeType = 0x000002000, | |
| /// <summary>get system icon index</summary> | |
| SysIconIndex = 0x000004000, | |
| /// <summary>put a link overlay on icon</summary> | |
| LinkOverlay = 0x000008000, | |
| /// <summary>show icon in selected state</summary> | |
| Selected = 0x000010000, | |
| /// <summary>get only specified attributes</summary> | |
| Attr_Specified = 0x000020000, | |
| /// <summary>get large icon</summary> | |
| LargeIcon = 0x000000000, | |
| /// <summary>get small icon</summary> | |
| SmallIcon = 0x000000001, | |
| /// <summary>get open icon</summary> | |
| OpenIcon = 0x000000002, | |
| /// <summary>get shell size icon</summary> | |
| ShellIconSize = 0x000000004, | |
| /// <summary>pszPath is a pidl</summary> | |
| PIDL = 0x000000008, | |
| /// <summary>use passed dwFileAttribute</summary> | |
| UseFileAttributes = 0x000000010, | |
| /// <summary>apply the appropriate overlays</summary> | |
| AddOverlays = 0x000000020, | |
| /// <summary>Get the index of the overlay in the upper 8 bits of the iIcon</summary> | |
| OverlayIndex = 0x000000040, | |
| } | |
| [StructLayout(LayoutKind.Sequential)] | |
| public struct SHFILEINFO | |
| { | |
| public const int NAMESIZE = 80; | |
| 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; | |
| }; | |
| [StructLayout(LayoutKind.Sequential)] | |
| public struct RECT | |
| { | |
| public int left, top, right, bottom; | |
| } | |
| [StructLayout(LayoutKind.Sequential)] | |
| public struct POINT | |
| { | |
| int x; | |
| int y; | |
| } | |
| [StructLayout(LayoutKind.Sequential)] | |
| public 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)] | |
| public struct IMAGEINFO | |
| { | |
| public IntPtr hbmImage; | |
| public IntPtr hbmMask; | |
| public int Unused1; | |
| public int Unused2; | |
| public RECT rcImage; | |
| } | |
| [ComImportAttribute()] | |
| [GuidAttribute("46EB5926-582E-4017-9FDF-E8998DAA0950")] | |
| [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)] | |
| public interface IImageList | |
| { | |
| [PreserveSig] | |
| int Add( | |
| IntPtr hbmImage, | |
| IntPtr hbmMask, | |
| ref int pi); | |
| [PreserveSig] | |
| int ReplaceIcon( | |
| int i, | |
| IntPtr hicon, | |
| ref int pi); | |
| [PreserveSig] | |
| int SetOverlayImage( | |
| int iImage, | |
| int iOverlay); | |
| [PreserveSig] | |
| int Replace( | |
| int i, | |
| IntPtr hbmImage, | |
| IntPtr hbmMask); | |
| [PreserveSig] | |
| int AddMasked( | |
| IntPtr hbmImage, | |
| int crMask, | |
| ref int pi); | |
| [PreserveSig] | |
| int Draw( | |
| ref IMAGELISTDRAWPARAMS pimldp); | |
| [PreserveSig] | |
| int Remove(int i); | |
| [PreserveSig] | |
| int GetIcon( | |
| int i, | |
| int flags, | |
| ref IntPtr picon); | |
| [PreserveSig] | |
| int GetImageInfo( | |
| int i, | |
| ref IMAGEINFO pImageInfo); | |
| [PreserveSig] | |
| int Copy( | |
| int iDst, | |
| IImageList punkSrc, | |
| int iSrc, | |
| int uFlags); | |
| [PreserveSig] | |
| int Merge( | |
| int i1, | |
| IImageList punk2, | |
| int i2, | |
| int dx, | |
| int dy, | |
| ref Guid riid, | |
| ref IntPtr ppv); | |
| [PreserveSig] | |
| int Clone( | |
| ref Guid riid, | |
| ref IntPtr ppv); | |
| [PreserveSig] | |
| int GetImageRect( | |
| int i, | |
| ref RECT prc); | |
| [PreserveSig] | |
| int GetIconSize( | |
| ref int cx, | |
| ref int cy); | |
| [PreserveSig] | |
| int SetIconSize( | |
| int cx, | |
| int cy); | |
| [PreserveSig] | |
| int GetImageCount(ref int pi); | |
| [PreserveSig] | |
| int SetImageCount( | |
| int uNewCount); | |
| [PreserveSig] | |
| int SetBkColor( | |
| int clrBk, | |
| ref int pclr); | |
| [PreserveSig] | |
| int GetBkColor( | |
| ref int pclr); | |
| [PreserveSig] | |
| int BeginDrag( | |
| int iTrack, | |
| int dxHotspot, | |
| int dyHotspot); | |
| [PreserveSig] | |
| int EndDrag(); | |
| [PreserveSig] | |
| int DragEnter( | |
| IntPtr hwndLock, | |
| int x, | |
| int y); | |
| [PreserveSig] | |
| int DragLeave( | |
| IntPtr hwndLock); | |
| [PreserveSig] | |
| int DragMove( | |
| int x, | |
| int y); | |
| [PreserveSig] | |
| int SetDragCursorImage( | |
| ref IImageList punk, | |
| int iDrag, | |
| int dxHotspot, | |
| int dyHotspot); | |
| [PreserveSig] | |
| int DragShowNolock( | |
| int fShow); | |
| [PreserveSig] | |
| int GetDragImage( | |
| ref POINT ppt, | |
| ref POINT pptHotspot, | |
| ref Guid riid, | |
| ref IntPtr ppv); | |
| [PreserveSig] | |
| int GetItemFlags( | |
| int i, | |
| ref int dwFlags); | |
| [PreserveSig] | |
| int GetOverlayImage( | |
| int iOverlay, | |
| ref int piIndex); | |
| }; | |
| } | |
| } |
Destroy icon and its usages comes from the ms docs, my guess is that continued use without properly freeing up those resources will cause memory leaks.
https://docs.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-extracticona
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
It seems there is no need to declare DestroyIcon as unsafe. The program works fine without it.