Get a 32x32 icon for a given file : File Util « File Stream « C# / C Sharp

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C# / C Sharp » File Stream » File UtilScreenshots 
Get a 32x32 icon for a given file
 



//Microsoft Reciprocal License (Ms-RL)
//http://bmcommons.codeplex.com/license
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Text;

namespace BlueMirror.Commons
{

    public static class Win32
    {

        public const uint SHGFI_ICON = 0x100;
        public const uint SHGFI_DISPLAYNAME = 0x200;
        public const uint SHGFI_TYPENAME = 0x400;
        public const uint SHGFI_ATTRIBUTES = 0x800;
        public const uint SHGFI_ICONLOCATION = 0x1000;
        public const uint SHGFI_EXETYPE = 0x2000;
        public const uint SHGFI_SYSICONINDEX = 0x4000;
        public const uint SHGFI_LINKOVERLAY = 0x8000;
        public const uint SHGFI_SELECTED = 0x10000;
        public const uint SHGFI_LARGEICON = 0x0;
        public const uint SHGFI_SMALLICON = 0x1;
        public const uint SHGFI_OPENICON = 0x2;
        public const uint SHGFI_SHELLICONSIZE = 0x4;
        public const uint SHGFI_PIDL = 0x8;
        public const uint SHGFI_USEFILEATTRIBUTES = 0x10;

        private const uint FILE_ATTRIBUTE_NORMAL = 0x80;
        private const uint FILE_ATTRIBUTE_DIRECTORY = 0x10;

        [DllImport("comctl32.dll")]
        private static extern int ImageList_GetImageCount(int himl);

        [DllImport("comctl32.dll")]
        private static extern int ImageList_GetIcon(int HIMAGELIST, int ImgIndex, int hbmMask);

        [DllImport("shell32.dll")]
        private static extern int SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, int cbfileInfo, uint uFlags);

        private struct SHFILEINFO
        {
            public IntPtr hIcon;
            public int iIcon;
            public int dwAttributes;
            public string szDisplayName;
            public string szTypeName;
        }

        public enum FileIconSize
        {
            Small,    // 16x16 pixels
            Large    // 32x32 pixels
        }

        // get a 32x32 icon for a given file

        public static Image GetFileIconAsImage(string fullpath) {
            return GetFileIconAsImage(fullpath, FileIconSize.Large);
        }

        public static Image GetFileIconAsImage(string fullpath, FileIconSize size) {
            SHFILEINFO info = new SHFILEINFO();

            uint flags = SHGFI_USEFILEATTRIBUTES | SHGFI_ICON;
            if (size == FileIconSize.Small) {
                flags |= SHGFI_SMALLICON;
            }

            int retval = SHGetFileInfo(fullpath, FILE_ATTRIBUTE_NORMAL, ref info, System.Runtime.InteropServices.Marshal.SizeOf(info), flags);
            if (retval == 0) {
                return null;  // error occured
            }

            System.Drawing.Icon icon = System.Drawing.Icon.FromHandle(info.hIcon);

            //ImageList imglist = new ImageList();
            //imglist.ImageSize = icon.Size;
            //imglist.Images.Add(icon);

            //Image image = imglist.Images[0];
            //icon.Dispose();
            //return image;
            return icon.ToBitmap();
        }

        public static Icon GetFileIcon(string fullpath, FileIconSize size) {
            SHFILEINFO info = new SHFILEINFO();

            uint flags = SHGFI_USEFILEATTRIBUTES | SHGFI_ICON;
            if (size == FileIconSize.Small) {
                flags |= SHGFI_SMALLICON;
            }

            int retval = SHGetFileInfo(fullpath, FILE_ATTRIBUTE_NORMAL, ref info, System.Runtime.InteropServices.Marshal.SizeOf(info), flags);
            if (retval == 0) {
                return null;  // error occured
            }

            System.Drawing.Icon icon = System.Drawing.Icon.FromHandle(info.hIcon);
            return icon;
        }

        public static Icon GetFolderIcon(string fullPath, FileIconSize size) {
            SHFILEINFO info = new SHFILEINFO();

            uint flags = SHGFI_USEFILEATTRIBUTES | SHGFI_ICON;
            if (size == FileIconSize.Small) {
                flags |= SHGFI_SMALLICON;
            }

            int retval = SHGetFileInfo(fullPath, FILE_ATTRIBUTE_DIRECTORY, ref info, System.Runtime.InteropServices.Marshal.SizeOf(info), flags);
            if (retval == 0) {
                return null;  // error occured
            }

            System.Drawing.Icon icon = System.Drawing.Icon.FromHandle(info.hIcon);
            return icon;
        }

        public static int GetFileIconIndex(string fullpath, FileIconSize size) {
            SHFILEINFO info = new SHFILEINFO();

            uint flags = SHGFI_USEFILEATTRIBUTES | SHGFI_SYSICONINDEX;
            if (size == FileIconSize.Small) {
                flags |= SHGFI_SMALLICON;
            }

            int retval = SHGetFileInfo(fullpath, FILE_ATTRIBUTE_NORMAL, ref info, System.Runtime.InteropServices.Marshal.SizeOf(info), flags);
            if (retval == 0) {
                return -1;  // error
            }

            return info.iIcon;
        }

        public static int GetFolderIconIndex(string fullpath, FileIconSize size) {
            SHFILEINFO info = new SHFILEINFO();

            uint flags = SHGFI_USEFILEATTRIBUTES | SHGFI_SYSICONINDEX;
            if (size == FileIconSize.Small) {
                flags |= SHGFI_SMALLICON;
            }

            int retval = SHGetFileInfo(fullpath, FILE_ATTRIBUTE_DIRECTORY, ref info, System.Runtime.InteropServices.Marshal.SizeOf(info), flags);
            if (retval == 0) {
                return -1;  // error
            }

            return info.iIcon;
        }

        public static void UpdateSystemImageList(ImageList imageList, FileIconSize size, bool isSelected, Image deletedImage) {
            SHFILEINFO info = new SHFILEINFO();
            uint flags = SHGFI_SYSICONINDEX;

            if (size == FileIconSize.Small)
                flags |= SHGFI_SMALLICON;

            if (isSelected == true)
                flags |= SHGFI_OPENICON;

            int imageHandle = SHGetFileInfo("C:\\", 0, ref info, System.Runtime.InteropServices.Marshal.SizeOf(info), flags);
            int iconCount = ImageList_GetImageCount(imageHandle);
            for (int i = imageList.Images.Count; i < iconCount; i++) {

                IntPtr iconHandle = (IntPtr)ImageList_GetIcon(imageHandle, i, 0);
                try {
                    if (iconHandle.ToInt64() != 0) {
                        Icon icon = Icon.FromHandle(iconHandle);
                        imageList.Images.Add(icon);
                        icon.Dispose();
                        DestroyIcon(iconHandle);
                    }
                }
                catch {
                    imageList.Images.Add(deletedImage);
                }
            }
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public extern static bool DestroyIcon(IntPtr handle);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public extern static int SendMessage(IntPtr hWnd, UInt32 Msg, int wParam, int lParam);

        [DllImport("winmm.dll", EntryPoint = "mciSendStringA")]
        extern static void mciSendStringA(string lpstrCommand, string lpstrReturnString, long uReturnLength, long hwndCallback);

        public static void Eject(string driveLetter) {
            string returnString = "";
            mciSendStringA("set cdaudio!" + driveLetter + " door open", returnString, 0, 0);
        }

        public static void Close(string driveLetter) {
            string returnString = "";
            mciSendStringA("set cdaudio!" + driveLetter + " door closed", returnString, 0, 0);
        }

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public extern static uint RegisterWindowMessage(string lpString);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public extern static void SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public extern static int GetWindowLong(IntPtr hWnd, int nIndex);

        // Constants and structs defined in DBT.h

        public const int WM_DEVICECHANGE = 0x0219;
        public const int DBT_DEVICEARRIVAL = 0x8000;
        public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
        public const int DBT_DEVNODES_CHANGED = 0x0007;

        public enum DeviceType : int
        {
            OEM = 0x00000000,           //DBT_DEVTYP_OEM
            DeviceNode = 0x00000001,    //DBT_DEVTYP_DEVNODE
            Volume = 0x00000002,        //DBT_DEVTYP_VOLUME
            Port = 0x00000003,          //DBT_DEVTYP_PORT
            Net = 0x00000004            //DBT_DEVTYP_NET
        }

        public struct BroadcastHeader   //_DEV_BROADCAST_HDR 
        {
            public int Size;            //dbch_size
            public DeviceType Type;     //dbch_devicetype
            public int Reserved;       //dbch_reserved
        }

        public struct Volume            //_DEV_BROADCAST_VOLUME 
        {
            public int Size;            //dbcv_size
            public DeviceType Type;     //dbcv_devicetype
            public int Reserved;       //dbcv_reserved
            public int Mask;            //dbcv_unitmask
            public int Flags;           //dbcv_flags
        }

        [DllImport("kernel32.dll")]
        public extern static long GetVolumeInformation(string PathName, StringBuilder VolumeNameBuffer, int VolumeNameSize, ref uint VolumeSerialNumber, ref uint MaximumComponentLength, ref uint FileSystemFlags, StringBuilder FileSystemNameBuffer, int FileSystemNameSize);

        public static string GetVolumeSerialNumber(string drive) {
            uint serNum = 0;
            uint maxCompLen = 0;
            StringBuilder volLabel = new StringBuilder(256);
            uint volFlags = 0;
            StringBuilder fileSystemName = new StringBuilder(256);
            /* long ret = */ GetVolumeInformation(drive, volLabel, volLabel.Capacity, ref serNum, ref maxCompLen, ref volFlags, fileSystemName, fileSystemName.Capacity);

            string serialNumberAsString = serNum.ToString("X");
            serialNumberAsString.PadLeft(8, '0');
            serialNumberAsString = serialNumberAsString.Substring(0, 4) + "-" + serialNumberAsString.Substring(4);
            return serialNumberAsString;
        }

        // List View
        public const int LVS_EX_DOUBLEBUFFER = 0x10000;

        public const int LVM_FIRST = 0x1000;
        public const int LVM_SETITEMSTATE = LVM_FIRST + 43;
        public const int LVM_SETEXTENDEDLISTVIEWSTYLE = LVM_FIRST + 54;
        public const int LVM_GETEXTENDEDLISTVIEWSTYLE = LVM_FIRST + 55;
        public const int LVM_SETCOLUMNORDERARRAY = LVM_FIRST + 58;
        public const int LVM_GETCOLUMNORDERARRAY = LVM_FIRST + 59;

        public const int LVIF_STATE = 0x0008;
        public const int LVIS_SELECTED = 0x0002;
        public const int LVIS_FOCUSED = 0x0001; 

        [StructLayout(LayoutKind.Sequential)]
        public struct LVITEM
        {
            public uint mask;
            public int iItem;
            public int iSubItem;
            public uint state;
            public uint stateMask;
            public string pszText;
            public int cchTextMax;
            public int iImage;
            public int lParam;
            public int iIndent;
            public int iGroupId;
            public uint cColumns;
            public uint puColumns;
        }

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public extern static int SendMessage(IntPtr hWnd, UInt32 Msg, int wParam, ref LVITEM lvItem);

        // Tree View Styles
        public const int TV_FIRST = 0x1100;
        public const int TVM_SETEXTENDEDSTYLE = TV_FIRST + 44;
        public const int TVM_GETEXTENDEDSTYLE = TV_FIRST + 45;
        public const int TVM_SETAUTOSCROLLINFO = TV_FIRST + 59;

        public const int TVS_NOHSCROLL = 0x8000;
        public const int TVS_EX_MULTISELECT = 0x0002;
        public const int TVS_EX_DOUBLEBUFFER = 0x0004;
        public const int TVS_EX_AUTOHSCROLL = 0x0020;
        public const int TVS_EX_FADEINOUTEXPANDOS = 0x0040;
        public const int GWL_STYLE = -16;

        [DllImport("uxtheme.dll", CharSet = CharSet.Unicode)]
        public extern static int SetWindowTheme(IntPtr hWnd, string pszSubAppName, string pszSubIdList);


        
    }

}

   
  
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