//http://msdn.microsoft.com/en-us/library/bb761848(VS.85).aspx
public static bool GetIExtractImage(
IShellFolder2 parent,
IntPtr filePidl,
out IntPtr iExtractImagePtr,
out IExtractImage iExtractImage)
{
if (parent.GetUIObjectOf(
IntPtr.Zero,
1,
new IntPtr[] { filePidl },
ref ShellAPI.IID_IExtractImage,
IntPtr.Zero,
out iExtractImagePtr) == ShellAPI.S_OK)
{
iExtractImage =
(IExtractImage)Marshal.GetTypedObjectForIUnknown(
iExtractImagePtr, typeof(IExtractImage));
return(true);
}
else
{
iExtractImagePtr = IntPtr.Zero;
iExtractImage = null;
return(false);
}
}
private static bool isVistaUp = Environment.OSVersion.Version.Major >= 6; //5 = XP, 6 = Vista
//http://msdn.microsoft.com/en-us/library/bb761848(VS.85).aspx
public static bool GetIExtractImage(
IShellFolder2 parent,
IntPtr filePidl,
out IntPtr iExtractImagePtr,
out IExtractImage iExtractImage)
{
if (!isVistaUp)
{
throw new NotSupportedException("Require Vista or above.");
}
if (parent.GetUIObjectOf(
IntPtr.Zero,
1,
new IntPtr[] { filePidl },
ref ShellAPI.IID_IExtractImage,
IntPtr.Zero,
out iExtractImagePtr) == ShellAPI.S_OK)
{
iExtractImage =
(IExtractImage)Marshal.GetTypedObjectForIUnknown(
iExtractImagePtr, typeof(IExtractImage));
return(true);
}
else
{
iExtractImagePtr = IntPtr.Zero;
iExtractImage = null;
return(false);
}
}
//http://msdn.microsoft.com/en-us/library/bb761848(VS.85).aspx
public static bool GetIExtractImage(
IShellFolder2 parent,
IntPtr filePidl,
out IntPtr iExtractImagePtr,
out IExtractImage iExtractImage)
{
if (parent.GetUIObjectOf(
IntPtr.Zero,
1,
new IntPtr[] { filePidl },
ref ShellAPI.IID_IExtractImage,
IntPtr.Zero,
out iExtractImagePtr) == ShellAPI.S_OK)
{
iExtractImage =
(IExtractImage)Marshal.GetTypedObjectForIUnknown(
iExtractImagePtr, typeof(IExtractImage));
return true;
}
else
{
iExtractImagePtr = IntPtr.Zero;
iExtractImage = null;
return false;
}
}
private bool _getThumbNail(string file, IntPtr pidl, IShellFolder item)
{
IntPtr hBmp = IntPtr.Zero;
IExtractImage extractImage = null;
IntPtr[] pidl_array = new IntPtr[] { pidl };
try
{
string pidlPath = PathFromPidl(pidl);
if (Path.GetFileName(pidlPath).ToUpper().Equals(Path.GetFileName(file).ToUpper()))
{
object iunk = null;
Guid iidExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
item.GetUIObjectOf(IntPtr.Zero, 1, pidl_array, ref iidExtractImage, IntPtr.Zero, out iunk);
extractImage = (IExtractImage)iunk;
if (extractImage != null)
{
Console.WriteLine("Got an IExtractImage object!");
SIZE sz = new SIZE();
sz.cx = DesiredSize.Width;
sz.cy = DesiredSize.Height;
StringBuilder location = new StringBuilder(260, 260);
int priority = 0;
int requestedColourDepth = 32;
EIEIFLAG flags = EIEIFLAG.IEIFLAG_ASPECT | EIEIFLAG.IEIFLAG_SCREEN;
int uFlags = (int)flags;
extractImage.GetLocation(location, location.Capacity, ref priority, ref sz, requestedColourDepth, ref uFlags);
extractImage.Extract(ref hBmp);
if (hBmp != IntPtr.Zero)
{
_thumbNail = Bitmap.FromHbitmap(hBmp);
}
Marshal.ReleaseComObject(extractImage);
extractImage = null;
}
return(true);
}
else
{
return(false);
}
}
catch (Exception ex)
{
if (hBmp != IntPtr.Zero)
{
UnmanagedMethods.DeleteObject(hBmp);
}
if (extractImage != null)
{
Marshal.ReleaseComObject(extractImage);
}
throw ex;
}
}
private bool GetThumbnail(string file, IntPtr pidl, IShellFolder item, int width, int height)
{
IntPtr hBmp = IntPtr.Zero;
IExtractImage extractImage = null;
try
{
string pidlPath = PathFromPidl(pidl);
if (Path.GetFileName(pidlPath).ToUpper().Equals(Path.GetFileName(file).ToUpper()))
{
IUnknown iunk = null;
int prgf = 0;
Guid iidExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
item.GetUIObjectOf(IntPtr.Zero, 1, ref pidl, ref iidExtractImage, out prgf, ref iunk);
extractImage = (IExtractImage)iunk;
if (extractImage != null)
{
SIZE sz = new SIZE();
sz.cx = width;
sz.cy = height;
StringBuilder location = new StringBuilder(260, 260);
int priority = 0;
int requestedColourDepth = 32;
EIEIFLAG flags = EIEIFLAG.IEIFLAG_ASPECT | EIEIFLAG.IEIFLAG_SCREEN;
int uFlags = (int)flags;
extractImage.GetLocation(location, location.Capacity, ref priority, ref sz, requestedColourDepth, ref uFlags);
extractImage.Extract(out hBmp);
if (hBmp != IntPtr.Zero)
{
thumbNail = System.Drawing.Bitmap.FromHbitmap(hBmp);
}
Marshal.ReleaseComObject(extractImage);
extractImage = null;
}
return(true);
}
else
{
return(false);
}
}
catch (Exception ex)
{
if (hBmp != IntPtr.Zero)
{
UnmanagedMethods.DeleteObject(hBmp);
}
if (extractImage != null)
{
Marshal.ReleaseComObject(extractImage);
}
throw ex;
}
}
public static Bitmap ExtractImage(FileInfoEx entry, Size size, bool quality)
{
try
{
IntPtr iExtractImagePtr = IntPtr.Zero;
IExtractImage iExtractImage = null;
if (GetIExtractImage(entry, out iExtractImagePtr, out iExtractImage))
{
try
{
ShellDll.ShellAPI.SIZE prgSize = new ShellAPI.SIZE()
{
cx = size.Width, cy = size.Height
};
IExtractImageFlags flags = IExtractImageFlags.Cache | IExtractImageFlags.Aspect;
if (quality)
{
flags |= IExtractImageFlags.Quality;
}
StringBuilder location = new StringBuilder(260, 260);
try
{
int pdwPriority = 1;
iExtractImage.GetLocation(location,
location.Capacity, ref pdwPriority, ref prgSize, 32, ref flags);
}
catch (COMException) { }
IntPtr ptrBitmapImage = IntPtr.Zero;
iExtractImage.Extract(out ptrBitmapImage);
if (ptrBitmapImage != IntPtr.Zero)
{
return(Bitmap.FromHbitmap(ptrBitmapImage));
}
}
catch (Exception) { }
}
finally
{
if (iExtractImage != null)
{
Marshal.ReleaseComObject(iExtractImage);
}
if (iExtractImagePtr != IntPtr.Zero)
{
Marshal.Release(iExtractImagePtr);
}
}
return(null);
}
public static bool GetIExtractImage(
FileInfoEx file,
out IntPtr iExtractImagePtr,
out IExtractImage iExtractImage)
{
using (ShellFolder2 sf2 = file.Parent.ShellFolder)
{
PIDL filePIDL = file.PIDLRel;
try
{
return(GetIExtractImage(sf2, filePIDL.Ptr, out iExtractImagePtr, out iExtractImage));
}
finally { filePIDL.Free(); }
}
}
private void GenerateIExtractImage(string path)
{
try {
// we get the desktop shell then the PIDL for the file's folder.
// Once we have the PIDL then get a reference to the folder (BindToObject) then we can get the PIDL for the file.
//Now get the IExtractImage interface (GETUIObjectOf) from which we can cast to the IExtractImage object
SHGetDesktopFolder(out _desktopFolder);
int pdwAttributes = 0; // not required
int pchEaten = 0; // not required
_hResult = _desktopFolder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, System.IO.Path.GetDirectoryName(path), out pchEaten, out _folderPidl, out pdwAttributes);
if (_hResult != S_OK)
{
Marshal.ThrowExceptionForHR(_hResult);
}
_hResult = _desktopFolder.BindToObject(_folderPidl, IntPtr.Zero, ref _iidShellFolder, ref _folder);
if (_hResult != S_OK)
{
Marshal.ThrowExceptionForHR(_hResult);
}
_hResult = _folder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, System.IO.Path.GetFileName(path), out pchEaten, out _filePidl, out pdwAttributes);
if (_hResult != S_OK)
{
Marshal.ThrowExceptionForHR(_hResult);
}
IUnknown unk = null;
_hResult = _folder.GetUIObjectOf(IntPtr.Zero, 1, ref _filePidl, ref _iidExtractImage, out _reserved, ref unk);
if (_hResult != S_OK)
{
Marshal.ThrowExceptionForHR(_hResult);
}
// Now cast the unknown as the extractImage object
_extractImage = (IExtractImage)unk;
} catch (FileNotFoundException) {
} catch (COMException) {
} catch (Exception) {
}
}
private void GenerateIExtractImage()
{
try
{
ShellMgr.SHGetDesktopFolder(out this._desktopFolder);
int num = 0;
int num2 = 0;
this.hResult = this._desktopFolder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, System.IO.Path.GetDirectoryName(this._path), out num2, out this._folderPidl, out num);
if (this.hResult != 0)
{
Marshal.ThrowExceptionForHR(this.hResult);
}
this.hResult = this._desktopFolder.BindToObject(this._folderPidl, IntPtr.Zero, ref this.iidShellFolder, ref this._folder);
if (this.hResult != 0)
{
Marshal.ThrowExceptionForHR(this.hResult);
}
this.hResult = this._folder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, System.IO.Path.GetFileName(this._path), out num2, out this._filePidl, out num);
if (this.hResult != 0)
{
Marshal.ThrowExceptionForHR(this.hResult);
}
IUnknown unknown = null;
this.hResult = this._folder.GetUIObjectOf(IntPtr.Zero, 1, ref this._filePidl, ref this.iidExtractImage, out this._reserved, ref unknown);
if (this.hResult != 0)
{
Marshal.ThrowExceptionForHR(this.hResult);
}
this._extractImage = (IExtractImage)unknown;
}
catch (FileNotFoundException)
{
}
catch (COMException)
{
}
catch (Exception)
{
}
}
public static Bitmap ExtractImage(FileInfoEx entry, Size size, bool quality)
{
IntPtr iExtractImagePtr = IntPtr.Zero;
IExtractImage iExtractImage = null;
if (GetIExtractImage(entry, out iExtractImagePtr, out iExtractImage))
{
try
{
ShellDll.ShellAPI.SIZE prgSize = new ShellAPI.SIZE()
{
cx = size.Width, cy = size.Height
};
IExtractImageFlags flags = IExtractImageFlags.Async | IExtractImageFlags.Aspect;
if (quality)
{
flags |= IExtractImageFlags.Quality;
}
StringBuilder location = new StringBuilder(260, 260);
try
{
iExtractImage.GetLocation(location,
location.Capacity, 1, prgSize, 32, flags);
}
catch (COMException) { }
IntPtr ptrBitmapImage = IntPtr.Zero;
iExtractImage.Extract(out ptrBitmapImage);
if (ptrBitmapImage != IntPtr.Zero)
{
return(Bitmap.FromHbitmap(ptrBitmapImage));
}
}
catch (Exception) { }
}
private bool getThumbnail(string file, IntPtr pidl, IShellFolder item)
{
IntPtr hBmp = IntPtr.Zero;
IExtractImage extractImage = null;
try
{
string pidlPath = PathFromPidl(pidl);
if (Path.GetFileName(pidlPath).ToUpperInvariant().Equals(Path.GetFileName(file).ToUpperInvariant()))
{
// we have the item:
IUnknown iunk = null;
int prgf = 0;
Guid iidExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
item.GetUIObjectOf(IntPtr.Zero, 1, ref pidl, ref iidExtractImage, out prgf, ref iunk);
extractImage = (IExtractImage)iunk;
if (extractImage != null)
{
//Got an IExtractImage object!
SIZE sz = new SIZE();
sz.cx = desiredSize.Width;
sz.cy = desiredSize.Height;
StringBuilder location = new StringBuilder(260, 260);
int priority = 0;
int requestedColourDepth = 32;
//EIEIFLAG flags = EIEIFLAG.IEIFLAG_ASPECT | EIEIFLAG.IEIFLAG_SCREEN;
EIEIFLAG flags = EIEIFLAG.IEIFLAG_ORIGSIZE | EIEIFLAG.IEIFLAG_ASPECT | EIEIFLAG.IEIFLAG_QUALITY;
int uFlags = (int)flags;
// E.g. for PDFs on Vista...
try
{
extractImage.GetLocation(location, location.Capacity, ref priority, ref sz, requestedColourDepth,
ref uFlags);
}
catch (Exception) {}
extractImage.Extract(out hBmp);
if (hBmp != IntPtr.Zero)
{
// create the image object:
thumbNail = System.Drawing.Bitmap.FromHbitmap(hBmp);
// is thumbNail owned by the Bitmap?
}
Marshal.ReleaseComObject(extractImage);
extractImage = null;
}
return(true);
}
else
{
return(false);
}
}
catch (Exception ex)
{
if (hBmp != IntPtr.Zero)
{
UnManagedMethods.DeleteObject(hBmp);
}
if (extractImage != null)
{
Marshal.ReleaseComObject(extractImage);
}
throw ex;
}
}
public static bool GetIExtractImage(
FileInfoEx file,
out IntPtr iExtractImagePtr,
out IExtractImage iExtractImage)
{
using (ShellFolder2 sf2 = file.Parent.ShellFolder)
{
PIDL filePIDL = file.PIDLRel;
try
{
return GetIExtractImage(sf2, filePIDL.Ptr, out iExtractImagePtr, out iExtractImage);
}
finally { filePIDL.Free(); }
}
}
Bitmap GetThumbnailFromIExtractImage(string fileName, int colorDepth)
{
IShellFolder desktopFolder;
IShellFolder someFolder = null;
IExtractImage extract = null;
IntPtr pidl;
IntPtr filePidl;
// Manually define the IIDs for IShellFolder and IExtractImage
Guid IID_IShellFolder = new Guid("000214E6-0000-0000-C000-000000000046");
Guid IID_IExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
//Divide the file name into a path and file name
string folderName = Path.GetDirectoryName(fileName);
string shortFileName = Path.GetFileName(fileName);
//Get the desktop IShellFolder
desktopFolder = getDesktopFolder;
//Get the parent folder IShellFolder
int cParsed = 0;
int pdwAttrib = 0;
desktopFolder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, folderName, out cParsed, out pidl, out pdwAttrib);
desktopFolder.BindToObject(pidl, IntPtr.Zero, ref IID_IShellFolder, ref someFolder);
//Get the file//s IExtractImage
someFolder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, shortFileName, out cParsed, out filePidl, out pdwAttrib);
object iunk = null;
IntPtr[] pidl_array = new IntPtr[] { filePidl };
someFolder.GetUIObjectOf(IntPtr.Zero, 1, pidl_array, ref IID_IExtractImage, IntPtr.Zero, out iunk);
extract = (IExtractImage)iunk;
//Set the size
SIZE size;
size.cx = DesiredSize.Width;
size.cy = DesiredSize.Height;
StringBuilder location = new StringBuilder(260, 260);
int priority = 0;
int requestedColourDepth = 32;
// The IEIFLAG_ORIGSIZE flag tells it to use the original aspect
// ratio for the image size. The IEIFLAG_QUALITY flag tells the
// interface we want the image to be the best possible quality.
EIEIFLAG flags = EIEIFLAG.IEIFLAG_ORIGSIZE | EIEIFLAG.IEIFLAG_QUALITY; // EIEIFLAG.IEIFLAG_ASPECT;// EIEIFLAG.IEIFLAG_SCREEN; //EIEIFLAG flags = EIEIFLAG.IEIFLAG_ORIGSIZE | EIEIFLAG.IEIFLAG_QUALITY;
int uFlags = (int)flags;
IntPtr bmp;
//Interop will throw an exception if one of these calls fail.
try
{
extract.GetLocation(location, location.Capacity, ref priority, ref size, requestedColourDepth, ref uFlags);
extract.Extract(out bmp);
if (!bmp.Equals(IntPtr.Zero))
{
return(Image.FromHbitmap(bmp));
}
else
{
return(null);
}
}
catch
{
return(null);
}
finally
{
//Free the pidls. The Runtime Callable Wrappers should automatically release the COM objects
Marshal.FreeCoTaskMem(pidl);
Marshal.FreeCoTaskMem(filePidl);
}
}
private bool GetThumbnailHelper(string file, IntPtr pidl, IShellFolder item)
{
IntPtr bitmapPointer = IntPtr.Zero;
IExtractImage extractImage = null;
try
{
string pidlPath = this.PathFromPidl(pidl);
if (Path.GetFileName(pidlPath).ToUpper().Equals(Path.GetFileName(file).ToUpper()))
{
IUnknown iunk = null;
int prgf = 0;
Guid iidExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
item.GetUIObjectOf(IntPtr.Zero, 1, ref pidl, ref iidExtractImage, ref prgf, ref iunk);
extractImage = (IExtractImage)iunk;
if (extractImage != null)
{
Console.WriteLine("Got an IExtractImage object - " + file);
SIZE sz = new SIZE();
sz.HorizontalSize = this.DesiredSize.Width;
sz.VerticalSize = this.DesiredSize.Height;
StringBuilder location = new StringBuilder(260, 260);
int priority = 0;
int requestedColourDepth = 32;
EIEIFLAG flags = EIEIFLAG.IEIFLAG_ASPECT | EIEIFLAG.IEIFLAG_SCREEN;
int nameFlags = (int)flags;
extractImage.GetLocation(location, location.Capacity, ref priority, ref sz, requestedColourDepth, ref nameFlags);
extractImage.Extract(ref bitmapPointer);
if (bitmapPointer != IntPtr.Zero)
{
this.thumbNail = Bitmap.FromHbitmap(bitmapPointer);
}
Marshal.ReleaseComObject(extractImage);
extractImage = null;
}
return(true);
}
else
{
return(false);
}
}
catch (Exception ex)
{
if (bitmapPointer != IntPtr.Zero)
{
UnmanagedMethods.DeleteObject(bitmapPointer);
}
if (extractImage != null)
{
Marshal.ReleaseComObject(extractImage);
}
throw ex;
}
}
private static ImageData LoadThumbnail2(string path, DateTime dtLastWriteTime, out Size sizeRaw, out Size sizeActual, out string toolTipText, out bool fCached)
{
sizeRaw = sizeActual = Size.Empty;
toolTipText = null;
fCached = false;
IntPtr zero = IntPtr.Zero;
IShellFolder ppv = null;
object obj2 = null;
try {
IntPtr ptr3;
zero = PInvoke.ILCreateFromPath(path);
if ((zero != IntPtr.Zero) && (PInvoke.SHBindToParent(zero, ExplorerGUIDs.IID_IShellFolder, out ppv, out ptr3) == 0))
{
uint rgfReserved = 0;
Guid riid = ExplorerGUIDs.IID_IExtractImage;
IntPtr[] apidl = new IntPtr[] { ptr3 };
if (ppv.GetUIObjectOf(IntPtr.Zero, 1, apidl, ref riid, ref rgfReserved, out obj2) == 0)
{
IntPtr ptr2;
IExtractImage image = (IExtractImage)obj2;
StringBuilder pszPathBuffer = new StringBuilder(260);
int pdwPriority = 0;
Size prgSize = new Size(QTUtility.PreviewMaxWidth, QTUtility.PreviewMaxHeight);
int pdwFlags = 0x60;
if (((image.GetLocation(pszPathBuffer, pszPathBuffer.Capacity, ref pdwPriority, ref prgSize, 0x18, ref pdwFlags) == 0) && (image.Extract(out ptr2) == 0)) && (ptr2 != IntPtr.Zero))
{
Bitmap bmp = Image.FromHbitmap(ptr2);
Size size = bmp.Size;
sizeRaw = sizeActual = size;
ImageData data = new ImageData(bmp, null, path, dtLastWriteTime, size, size);
data.Thumbnail = true;
try {
toolTipText = data.TooltipText = ShellMethods.GetShellInfoTipText(zero, false);
}
catch {
}
return(data);
}
}
}
}
catch (Exception exception) {
QTUtility2.MakeErrorLog(exception, null);
}
finally {
if (zero != IntPtr.Zero)
{
PInvoke.CoTaskMemFree(zero);
}
if (ppv != null)
{
Marshal.ReleaseComObject(ppv);
}
if (obj2 != null)
{
Marshal.ReleaseComObject(obj2);
}
}
return(null);
}
public Bitmap LoadThumbnailFromExtractImage(string filename, Size requestedSize)
{
if (!System.IO.Directory.Exists(filename) && !System.IO.File.Exists(filename))
{
return(null);
}
Bitmap bm1 = null;
IntPtr hbitmap = IntPtr.Zero;
SIZE sz = new SIZE(requestedSize.Width, requestedSize.Height);
IShellFolder desktop = null;
IntPtr pidlParent = IntPtr.Zero;
IShellFolder shellFolder = null;
IUnknown iunk = null;
IExtractImage extractImage = null;
try
{
Debug.Write("Trying IExtractImage\r\n");
Shell32.SHGetDesktopFolder(ref desktop);
int cParsed = 0;
int pdwAttrib = 0;
string filePath = filename;
if (System.IO.File.Exists(filename))
{
filePath = System.IO.Path.GetDirectoryName(filename);
}
desktop.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, filePath, out cParsed, out pidlParent, out pdwAttrib);
Guid uuidShellFolder = new Guid("000214E6-0000-0000-C000-000000000046");
desktop.BindToObject(pidlParent, IntPtr.Zero, ref uuidShellFolder, out shellFolder);
Guid uuidExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
iunk = GetUIObject(shellFolder, filename, uuidExtractImage);
if (iunk == null)
{
Debug.Write(" IExtractImage not supported\r\n");
return(null);
}
extractImage = (IExtractImage)iunk;
StringBuilder location = new StringBuilder(260, 260);
int priority = 0;
EIEIFLAG flags = EIEIFLAG.IEIFLAG_ORIGSIZE;
int uFlags = (int)flags;
extractImage.GetLocation(location, location.Capacity, ref priority, ref sz, 32, ref uFlags);
extractImage.Extract(out hbitmap);
bm1 = GetBitmapFromHbitmap(hbitmap);
}
catch (Exception e)
{
Debug.Write(" Exception extracting image from IExtractImage: " + e.Message + "\r\n");
}
finally
{
if (extractImage != null)
{
Marshal.ReleaseComObject(extractImage);
extractImage = null;
}
if (iunk != null)
{
Marshal.ReleaseComObject(iunk);
iunk = null;
}
if (shellFolder != null)
{
Marshal.ReleaseComObject(shellFolder);
shellFolder = null;
}
if (pidlParent != IntPtr.Zero)
{
Allocator.Free(pidlParent);
pidlParent = IntPtr.Zero;
}
if (desktop != null)
{
Marshal.ReleaseComObject(desktop);
desktop = null;
}
if (_allocator != null)
{
Marshal.ReleaseComObject(_allocator);
_allocator = null;
}
}
return(bm1);
}
private void GenerateIExtractImage(string path)
{
try {
// we get the desktop shell then the PIDL for the file's folder.
// Once we have the PIDL then get a reference to the folder (BindToObject) then we can get the PIDL for the file.
//Now get the IExtractImage interface (GETUIObjectOf) from which we can cast to the IExtractImage object
SHGetDesktopFolder(out _desktopFolder);
int pdwAttributes = 0; // not required
int pchEaten = 0; // not required
_hResult = _desktopFolder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, System.IO.Path.GetDirectoryName(path), out pchEaten, out _folderPidl, out pdwAttributes);
if (_hResult != S_OK) Marshal.ThrowExceptionForHR(_hResult);
_hResult = _desktopFolder.BindToObject(_folderPidl, IntPtr.Zero, ref _iidShellFolder, ref _folder);
if (_hResult != S_OK) Marshal.ThrowExceptionForHR(_hResult);
_hResult = _folder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, System.IO.Path.GetFileName(path), out pchEaten, out _filePidl, out pdwAttributes);
if (_hResult != S_OK) Marshal.ThrowExceptionForHR(_hResult);
IUnknown unk = null;
_hResult = _folder.GetUIObjectOf(IntPtr.Zero, 1, ref _filePidl, ref _iidExtractImage, out _reserved, ref unk);
if (_hResult != S_OK) Marshal.ThrowExceptionForHR(_hResult);
// Now cast the unknown as the extractImage object
_extractImage = (IExtractImage) unk;
} catch (FileNotFoundException) {
} catch (COMException) {
} catch (Exception) {
}
}
//http://msdn.microsoft.com/en-us/library/bb761848(VS.85).aspx
public static bool GetIExtractImage(
IShellFolder2 parent,
IntPtr filePidl,
out IntPtr iExtractImagePtr,
out IExtractImage iExtractImage)
{
if (!isVistaUp)
throw new NotSupportedException("Require Vista or above.");
if (parent.GetUIObjectOf(
IntPtr.Zero,
1,
new IntPtr[] { filePidl },
ref ShellAPI.IID_IExtractImage,
IntPtr.Zero,
out iExtractImagePtr) == ShellAPI.S_OK)
{
iExtractImage =
(IExtractImage)Marshal.GetTypedObjectForIUnknown(
iExtractImagePtr, typeof(IExtractImage));
return true;
}
else
{
iExtractImagePtr = IntPtr.Zero;
iExtractImage = null;
return false;
}
}
//==========================================================
//renvoie la miniature (ou à défaut l'icône) du fichier szFileName
//=========================================================
//IN szFileName : nom du fichier dont on veut la miniature
//IN dwCX : largeur de la miniature
//IN dwCY : hauteur de la miniature
//IN allowIcon: some videos don't have a true thumbnail.
// if true, it will return the icon of the default program used to open this kind of file
// (the icon of VLC for example)
//renvoie une instance d'image VB IPictureDisp
//==========================================================
private Bitmap ExtractImage(string szFileName, int dwCX, int dwCY, bool allowIcon = true)
{
int priority = 0;
int requestedColourDepth;
int flags;
SIZE sz;
IntPtr pidl = IntPtr.Zero;
IShellFolder isf = null;
IExtractImage ie = null;
IExtractIcon ii = null;
StringBuilder szPath;
int pindex = 0;
IntPtr pIconLarge = IntPtr.Zero;
IntPtr pIconSmall = IntPtr.Zero;
SHFILEINFO shgfi = new SHFILEINFO();
Bitmap ret = null;
requestedColourDepth = 32;
flags = (int)(EIEIFLAG.IEIFLAG_ASPECT | EIEIFLAG.IEIFLAG_OFFLINE | EIEIFLAG.IEIFLAG_SCREEN);
//on récupère le nom de fichier sous forme ITEMLIST (pidl) et le dossier parent sous forme IShellFolder
isf = GetShellFolder(szFileName, ref pidl);
// Try to get the thumbnail
ie = getThumbnail(isf, pidl);
// If not possible
if (ie == null)
{
// The icon
ii = getIcon(isf, pidl);
// If possible
if (!(ii == null))
{
// Extract the icon
szPath = new StringBuilder(260);
ii.GetIconLocation(0, szPath, 260, ref pindex, ref flags);
ii.Extract(szPath.ToString(), pindex, ref pIconLarge, ref pIconSmall, dwCX + 65536 * dwCX);
if (pIconLarge == IntPtr.Zero)
{
SHGetFileInfo(szFileName, 0, ref shgfi, Marshal.SizeOf(shgfi), SHGFIFLAGS.SHGFI_LARGEICON | SHGFIFLAGS.SHGFI_ICON | SHGFIFLAGS.SHGFI_OVERLAYINDEX);
ret = Icon.FromHandle(shgfi.hIcon).ToBitmap();
}
else
{
ret = Icon.FromHandle(pIconLarge).ToBitmap();
}
}
else
{
SHGetFileInfo(szFileName, 0, ref shgfi, Marshal.SizeOf(shgfi), SHGFIFLAGS.SHGFI_LARGEICON | SHGFIFLAGS.SHGFI_ICON | SHGFIFLAGS.SHGFI_OVERLAYINDEX);
ret = Icon.FromHandle(shgfi.hIcon).ToBitmap();
}
}
else // If possible
// Extract the thumbnail with the wanted dimensions
{
sz.cx = dwCX;
sz.cy = dwCY;
szPath = new StringBuilder(260);
EIEIFLAG f = (EIEIFLAG)flags;
int r = ie.GetLocation(szPath, szPath.Capacity, out priority, ref sz, requestedColourDepth, ref f);
try {
pIconLarge = ie.Extract();
} catch { }
// If not possible
if (pIconLarge == IntPtr.Zero)
{
// Retry to get the icon
ii = getIcon(isf, pidl);
// If possible
if (!(ii == null))
{
szPath = new StringBuilder(260);
ii.GetIconLocation(0, szPath, 260, ref pindex, ref flags);
ii.Extract(szPath.ToString(), pindex, ref pIconLarge, ref pIconSmall, dwCX + 65536 * dwCX);
if (pIconLarge == IntPtr.Zero)
{
SHGetFileInfo(szFileName, 0, ref shgfi, Marshal.SizeOf(shgfi), SHGFIFLAGS.SHGFI_LARGEICON | SHGFIFLAGS.SHGFI_ICON);
ret = Icon.FromHandle(shgfi.hIcon).ToBitmap();
}
else
{
if (!allowIcon)
{
return(null);
}
ret = Icon.FromHandle(pIconLarge).ToBitmap();
}
}
else
{
SHGetFileInfo(szFileName, 0, ref shgfi, Marshal.SizeOf(shgfi), SHGFIFLAGS.SHGFI_LARGEICON | SHGFIFLAGS.SHGFI_ICON);
ret = Icon.FromHandle(shgfi.hIcon).ToBitmap();
}
}
else
{
ret = (Bitmap)Bitmap.FromHbitmap(pIconLarge);
}
}
ILFree(pidl);
if (ret == null)
{
ret.MakeTransparent();
}
if (pIconLarge != IntPtr.Zero)
{
DeleteObject(pIconLarge);
}
if (pIconSmall != IntPtr.Zero)
{
DeleteObject(pIconSmall);
}
if (isf != null)
{
Marshal.ReleaseComObject(isf);
}
if (ie != null)
{
Marshal.ReleaseComObject(ie);
}
if (ii != null)
{
Marshal.ReleaseComObject(ii);
}
return(ret);
}
private bool getThumbNail(string file, IntPtr pidl, IShellFolder item)
{
IntPtr hBmp = IntPtr.Zero;
IExtractImage extractImage = null;
try
{
var pidlPath = pathFromPidl(pidl);
if (!Path.GetFileName(pidlPath).ToUpper().Equals(Path.GetFileName(file).ToUpper()))
{
return(false);
}
IUnknown iunk = null;
var prgf = 0;
var iidExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
item.GetUIObjectOf(IntPtr.Zero, 1, ref pidl, ref iidExtractImage, ref prgf, ref iunk);
extractImage = (IExtractImage)iunk;
if (extractImage == null)
{
return(true);
}
var sz = new Size {
cx = DesiredSize.Width, cy = DesiredSize.Height
};
var location = new StringBuilder(260, 260);
var priority = 0;
const int requestedColourDepth = 32;
const EIEIFLAG flags =
EIEIFLAG.IeiflagScreen | EIEIFLAG.IeiflagAsync | EIEIFLAG.IeiflagQuality | EIEIFLAG.IeiflagCache;
var uFlags = (int)flags;
try
{
extractImage.GetLocation(
location, location.Capacity, ref priority, ref sz, requestedColourDepth, ref uFlags);
}
catch { }
extractImage.Extract(ref hBmp);
if (hBmp != IntPtr.Zero)
{
ThumbNail = Image.FromHbitmap(hBmp);
}
Marshal.ReleaseComObject(extractImage);
extractImage = null;
return(true);
}
finally
{
if (hBmp != IntPtr.Zero)
{
UnmanagedMethods.DeleteObject(hBmp);
}
if (extractImage != null)
{
Marshal.ReleaseComObject(extractImage);
}
}
}
