public void AttachPreview(IntPtr handler, string fileName, Rect viewRect)
{
Release();
string CLSID = "8895b1c6-b41f-4c1c-a562-0d564250836f";
Guid g = new Guid(CLSID);
string[] exts = fileName.Split('.');
string ext = exts[exts.Length - 1];
using (RegistryKey hk = Registry.ClassesRoot.OpenSubKey(string.Format(@".{0}\ShellEx\{1:B}", ext, g)))
{
if (hk != null)
{
g = new Guid(hk.GetValue("").ToString());
Type type = Type.GetTypeFromCLSID(g, true);
object comObj = Activator.CreateInstance(type);
IInitializeWithFile fileInit = comObj as IInitializeWithFile;
IInitializeWithStream streamInit = comObj as IInitializeWithStream;
bool isInitialized = false;
try
{
if (fileInit != null)
{
fileInit.Initialize(fileName, 0);
isInitialized = true;
}
else if (streamInit != null)
{
stream = new COMStream(File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.Read));
streamInit.Initialize((IStream)stream, 0);
isInitialized = true;
}
}
catch (Exception ex)
{
Logging.Log.Warn("Unable to initialize IPreviewHandler", ex);
}
pHandler = comObj as IPreviewHandler;
if (isInitialized && pHandler != null)
{
RECT r = new RECT(viewRect);
pHandler.SetWindow(handler, ref r);
pHandler.SetRect(ref r);
pHandler.DoPreview();
}
else
{
Marshal.FinalReleaseComObject(comObj);
Release();
}
}
}
}
private void Release()
{
if (pHandler != null)
{
try
{
pHandler.Unload();
}
catch { }
Marshal.FinalReleaseComObject(pHandler);
pHandler = null;
}
if (stream != null)
{
stream.Dispose();
stream = null;
}
}
private void Release()
{
if (pHandler != null)
{
try
{
pHandler.Unload();
}
catch { }
Marshal.FinalReleaseComObject(pHandler);
pHandler = null;
}
if (stream != null)
{
stream.Dispose();
stream = null;
}
}
public void AttachPreview(IntPtr handler, string fileName, Rect viewRect)
{
Release();
try
{
string CLSID = "8895b1c6-b41f-4c1c-a562-0d564250836f";
Guid g = new Guid(CLSID);
string[] exts = fileName.Split('.');
string ext = exts[exts.Length - 1];
var regKey = string.Format(@".{0}\ShellEx\{1:B}", ext, g);
using (RegistryKey hk = Registry.ClassesRoot.OpenSubKey(regKey))
{
if (hk == null)
{
Logging.Log.WarnOnce("Unable to initialize IPreviewHandler - Registry Key not found: " + regKey);
return;
}
var objValue = hk.GetValue("");
if (objValue == null)
{
Logging.Log.WarnOnce("Unable to initialize IPreviewHandler - no handler registrated in Registry");
return;
}
if (!Guid.TryParse(objValue.ToString(), out g))
{
Logging.Log.WarnOnce("Unable to initialize IPreviewHandler - cannot parse guid from registry: " + objValue);
return;
}
Type type = Type.GetTypeFromCLSID(g, false);
if (type == null)
{
Logging.Log.WarnOnce(string.Format("Unable to initialize IPreviewHandler - could not load COM Object, Type.GetTypeFromCLSID({0}) returend false", g));
return;
}
object comObj = Activator.CreateInstance(type);
IInitializeWithFile fileInit = comObj as IInitializeWithFile;
IInitializeWithStream streamInit = comObj as IInitializeWithStream;
IInitializeWithItem itemInit = comObj as IInitializeWithItem;
bool isInitialized = false;
if (fileInit != null)
{
fileInit.Initialize(fileName, 0); // 0 = STGM_READ
isInitialized = true;
}
else if (streamInit != null)
{
stream = new COMStream(File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.Read));
streamInit.Initialize((IStream)stream, 0); // 0 = STGM_READ
isInitialized = true;
}
else if (itemInit != null)
{
IShellItem shellItem;
SHCreateItemFromParsingName(fileName, IntPtr.Zero, typeof(IShellItem).GUID, out shellItem);
itemInit.Initialize(shellItem, 0); // 0 = STGM_READ
isInitialized = true;
}
pHandler = comObj as IPreviewHandler;
if (isInitialized && pHandler != null)
{
RECT r = new RECT(viewRect);
pHandler.SetWindow(handler, ref r);
pHandler.SetRect(ref r);
pHandler.DoPreview();
}
else
{
Release();
}
}
}
catch (Exception ex)
{
Logging.Log.Warn("Unable to initialize IPreviewHandler", ex);
Release();
}
}
public void AttachPreview(IntPtr handler, string fileName, Rect viewRect)
{
Release();
string CLSID = "8895b1c6-b41f-4c1c-a562-0d564250836f";
Guid g = new Guid(CLSID);
string[] exts = fileName.Split('.');
string ext = exts[exts.Length - 1];
using (RegistryKey hk = Registry.ClassesRoot.OpenSubKey(string.Format(@".{0}\ShellEx\{1:B}", ext, g)))
{
if (hk != null)
{
g = new Guid(hk.GetValue("").ToString());
Type type = Type.GetTypeFromCLSID(g, true);
object comObj = Activator.CreateInstance(type);
IInitializeWithFile fileInit = comObj as IInitializeWithFile;
IInitializeWithStream streamInit = comObj as IInitializeWithStream;
bool isInitialized = false;
try
{
if (fileInit != null)
{
fileInit.Initialize(fileName, 0);
isInitialized = true;
}
else if (streamInit != null)
{
stream = new COMStream(File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.Read));
streamInit.Initialize((IStream)stream, 0);
isInitialized = true;
}
}
catch (Exception ex)
{
Logging.Log.Warn("Unable to initialize IPreviewHandler", ex);
}
pHandler = comObj as IPreviewHandler;
if (isInitialized && pHandler != null)
{
RECT r = new RECT(viewRect);
pHandler.SetWindow(handler, ref r);
pHandler.SetRect(ref r);
pHandler.DoPreview();
}
else
{
Marshal.FinalReleaseComObject(comObj);
Release();
}
}
}
}
