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;
}
}
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;
}
}
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;
}
}
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 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);
}
}
}
//==========================================================
//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);
}
