private void Extract(int width, int height, IEIFLAG flags)
{
IntPtr bitmap = IntPtr.Zero;
SIZE size = new SIZE {
cx = width,
cy = height
};
try {
if (_extractImage != null) {
StringBuilder location = new StringBuilder(260);
int priority = 0;
const int requestedColorDepth = 32;
_hResult = _extractImage.GetLocation(location, location.Capacity, ref priority, ref size, requestedColorDepth, ref flags);
if (_hResult != S_OK) Marshal.ThrowExceptionForHR(_hResult);
_hResult = _extractImage.Extract(out bitmap);
if (_hResult != S_OK) Marshal.ThrowExceptionForHR(_hResult);
Thumbnail = Image.FromHbitmap(bitmap);
}
} catch (COMException) {
} catch (Exception) {
} finally {
if (bitmap != IntPtr.Zero)
Marshal.Release(bitmap);
}
}
private Bitmap Extract(int width, int height, IEIFLAG flags, bool scale, bool aspect)
{
IntPtr zero = IntPtr.Zero;
SIZE sIZE = default(SIZE);
sIZE.cx = width;
sIZE.cy = height;
PixelFormat bgra = PixelFormats.Bgra32;
BitmapPalette halftone256Transparent = BitmapPalettes.Halftone256Transparent;
int num = (width * bgra.BitsPerPixel + 7) / 8;
byte[] pixels = new byte[num * height];
BitmapSource bmpSrc = BitmapSource.Create(width, height, 96.0, 96.0, bgra, halftone256Transparent, pixels, num);
try
{
if (this._extractImage != null)
{
StringBuilder stringBuilder = new StringBuilder(260);
int num2 = 0;
this.hResult = this._extractImage.GetLocation(stringBuilder, stringBuilder.Capacity, ref num2, ref sIZE, 32, ref flags);
if (this.hResult != 0)
{
Marshal.ThrowExceptionForHR(this.hResult);
}
this.hResult = this._extractImage.Extract(out zero);
if (this.hResult != 0)
{
Marshal.ThrowExceptionForHR(this.hResult);
}
BitmapSource bitmapSource = Imaging.CreateBitmapSourceFromHBitmap(zero, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
if (scale && (bitmapSource.PixelHeight != sIZE.cy || bitmapSource.PixelWidth != sIZE.cx))
{
return(this.BmpFromBmpSource(ShellMgr.ScaleImage(bitmapSource, sIZE.cx, sIZE.cy, aspect)));
}
return(this.BmpFromBmpSource(bitmapSource));
}
return(this.BmpFromBmpSource(bmpSrc));
}
catch (COMException)
{
return(this.BmpFromBmpSource(bmpSrc));
}
catch (Exception)
{
return(this.BmpFromBmpSource(bmpSrc));
}
finally
{
if (zero != IntPtr.Zero)
{
Marshal.Release(zero);
}
}
}
private void Extract(int width, int height, IEIFLAG flags)
{
IntPtr bitmap = IntPtr.Zero;
SIZE size = new SIZE {
cx = width,
cy = height
};
try {
if (_extractImage != null)
{
StringBuilder location = new StringBuilder(260);
int priority = 0;
const int requestedColorDepth = 32;
_hResult = _extractImage.GetLocation(location, location.Capacity, ref priority, ref size, requestedColorDepth, ref flags);
if (_hResult != S_OK)
{
Marshal.ThrowExceptionForHR(_hResult);
}
_hResult = _extractImage.Extract(out bitmap);
if (_hResult != S_OK)
{
Marshal.ThrowExceptionForHR(_hResult);
}
Thumbnail = Image.FromHbitmap(bitmap);
}
} catch (COMException) {
} catch (Exception) {
} finally {
if (bitmap != IntPtr.Zero)
{
Marshal.Release(bitmap);
}
}
}
public Bitmap ExtractImage(int width, int height, IEIFLAG flags, bool scale, bool aspect)
{
return(this.Extract(width, height, flags, scale, aspect));
}
public Bitmap ExtractImage(int squareWidth, IEIFLAG flags, bool scale, bool aspect)
{
return(this.Extract(squareWidth, squareWidth, flags, scale, aspect));
}
static Image getThumbnailImageInternal(string filePath, IEIFLAG flags, Size size) {
IShellFolder desktopFolder = null;
IShellFolder folderShell = null;
IExtractImage extract = null;
object extractObj = null;
IntPtr folderPidl = IntPtr.Zero;
int dwAttributes = 0;
int dwFileAttributes = 0;
IntPtr filePidl = IntPtr.Zero;
IntPtr thePath = IntPtr.Zero;
int chEaten = 0;
int chFileEaten = 0;
int prfgInOut = 0;
IntPtr hBmpThumbnail = IntPtr.Zero;
int dwPriority = 0;
var IID_IShellFolder = new Guid("000214E6-0000-0000-C000-000000000046");
var IID_IExtractImage = new Guid("BB2E617C-0920-11d1-9A0B-00C04FC2D6C1");
var folderName = Path.GetDirectoryName(filePath);
var shortFileName = Path.GetFileName(filePath);
try {
SHGetDesktopFolder(out desktopFolder);
desktopFolder.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, folderName, ref chEaten, out folderPidl, ref dwAttributes);
if (folderPidl == IntPtr.Zero) {
throw new Exception("fault: ParseDisplayName #1");
}
desktopFolder.BindToObject(folderPidl, IntPtr.Zero, ref IID_IShellFolder, ref folderShell);
if (folderShell == null) {
throw new Exception("fault: BindToObject");
}
folderShell.ParseDisplayName(IntPtr.Zero, IntPtr.Zero, shortFileName, ref chFileEaten, out filePidl, ref dwFileAttributes);
if (filePidl == IntPtr.Zero) {
throw new Exception("fault: ParseDisplayName #2");
}
folderShell.GetUIObjectOf(IntPtr.Zero, 1, ref filePidl, ref IID_IExtractImage, ref prfgInOut, out extractObj);
if (extractObj == null) {
throw new Exception("fault: GetUIObjectOf");
}
extract = (IExtractImage)extractObj;
SIZE prgSize = new SIZE() { cx = size.Width, cy = size.Height };
StringBuilder pathBuffer = new StringBuilder(MAX_PATH);
Console.WriteLine(pathBuffer);
extract.GetLocation(pathBuffer, pathBuffer.Capacity, ref dwPriority, ref prgSize, 32, ref flags);
hBmpThumbnail = IntPtr.Zero;
extract.Extract(out hBmpThumbnail);
if (hBmpThumbnail == IntPtr.Zero) {
throw new Exception("fault: Extract");
}
Image img = Image.FromHbitmap(hBmpThumbnail);
Bitmap bmp = new Bitmap(img);
return bmp;
}
catch (Exception ex) {
throw ex;
}
finally {
if (extract != null) Marshal.ReleaseComObject(extract);
if (filePidl != IntPtr.Zero) Marshal.FreeCoTaskMem(filePidl);
if (folderShell != null) Marshal.ReleaseComObject(folderShell);
if (folderPidl != IntPtr.Zero) Marshal.FreeCoTaskMem(folderPidl);
if (hBmpThumbnail != IntPtr.Zero) DeleteObject(hBmpThumbnail);
}
}
