private void CreateLocalCopyFromHttpSource(
NativeInterfaces.IShellItem item,
IFileTransferProgressEvents progressEvents,
out string pathNameResult)
{
string url = null;
item.GetDisplayName(NativeConstants.SIGDN.SIGDN_URL, out url);
Uri uri = new Uri(url);
string pathName = FileSystem.GetTempPathName(url);
WebRequest webRequest = WebRequest.Create(uri);
webRequest.Timeout = 5000;
using (WebResponse webResponse = webRequest.GetResponse())
{
VerifyNotCanceled();
using (Stream uriStream = webResponse.GetResponseStream())
{
VerifyNotCanceled();
using (FileStream outStream = new FileStream(pathName, FileMode.Create, FileAccess.Write, FileShare.Read))
{
VerifyNotCanceled();
const int bufSize = 512;
long length = webResponse.ContentLength;
long bytesLeft = length;
byte[] buffer = new byte[bufSize];
progressEvents.SetItemWorkTotal(length);
while (bytesLeft > 0)
{
int amtRead = uriStream.Read(buffer, 0, buffer.Length);
VerifyNotCanceled();
outStream.Write(buffer, 0, amtRead);
VerifyNotCanceled();
bytesLeft -= amtRead;
progressEvents.SetItemWorkProgress(length - bytesLeft);
VerifyNotCanceled();
}
}
}
}
pathNameResult = pathName;
}
private unsafe void CreateLocalCopyFromIStreamSource(
NativeInterfaces.IShellItem item,
IFileTransferProgressEvents progressEvents,
out string pathNameResult)
{
string fileName = null;
item.GetDisplayName(NativeConstants.SIGDN.SIGDN_NORMALDISPLAY, out fileName);
string pathName = FileSystem.GetTempPathName(fileName);
Guid bhidStream = NativeConstants.BHID_Stream;
Guid iid_IStream = new Guid(NativeConstants.IID_IStream);
NativeInterfaces.IStream iStream = null;
item.BindToHandler(IntPtr.Zero, ref bhidStream, ref iid_IStream, out iStream);
try
{
VerifyNotCanceled();
NativeStructs.STATSTG statstg = new NativeStructs.STATSTG();
iStream.Stat(out statstg, NativeConstants.STATFLAG.STATFLAG_NONAME);
progressEvents.SetItemWorkTotal((long)statstg.cbSize);
const int bufSize = 4096;
byte[] buffer = new byte[bufSize];
fixed(void *pbBuffer = buffer)
{
IntPtr pbBuffer2 = new IntPtr(pbBuffer);
ulong qwBytesLeft = statstg.cbSize;
using (FileStream localFile = new FileStream(pathName, FileMode.Create, FileAccess.Write, FileShare.Read))
{
VerifyNotCanceled();
// NOTE: We do not call VerifyNotCanceled() during any individual item. This is because, while testing
// this, it was determined that oftentimes the transfer gets very confused if we just stop
// calling Read() and jump straight to Marshal.ReleaseComObject(). By "confused" I mean that
// the "Canceling..." text would remain on the progress dialog for up to a minute, and then
// the blinking light on the camera would continue indefinitely and you wouldn't be able to
// use the camera again until you unplugged it and plugged it back in.
while (qwBytesLeft > 0)
{
uint wantToRead = (uint)Math.Min(qwBytesLeft, bufSize);
uint amtRead = 0;
iStream.Read(pbBuffer2, wantToRead, out amtRead);
if (amtRead > qwBytesLeft)
{
throw new InvalidOperationException("IStream::Read() reported that more bytes were read than were in the file");
}
qwBytesLeft -= amtRead;
localFile.Write(buffer, 0, (int)amtRead);
progressEvents.SetItemWorkProgress((long)(statstg.cbSize - qwBytesLeft));
}
}
VerifyNotCanceled();
}
}
finally
{
if (iStream != null)
{
try
{
Marshal.ReleaseComObject(iStream);
}
catch (Exception)
{
}
iStream = null;
}
}
pathNameResult = pathName;
}
// Returns true if the item copied successfully, false if it didn't (error or skipped)
private CopyResult CreateLocalCopy(
NativeInterfaces.IShellItem item,
IFileTransferProgressEvents progressEvents,
out string pathNameResult)
{
CopyResult returnResult;
WorkItemResult itemResult;
string displayName = null;
item.GetDisplayName(NativeConstants.SIGDN.SIGDN_NORMALDISPLAY, out displayName);
progressEvents.SetItemInfo(displayName);
progressEvents.BeginItem();
while (true)
{
// Determine whether to copy from HTTP or from IStream. The heuristic we use here is simple:
// if the attributes has SFGAO_CANCOPY, we IStream it. Else, we HTTP it.
NativeConstants.SFGAO attribs;
item.GetAttributes((NativeConstants.SFGAO) 0xfffffff, out attribs);
try
{
if ((attribs & NativeConstants.SFGAO.SFGAO_CANCOPY) == NativeConstants.SFGAO.SFGAO_CANCOPY)
{
CreateLocalCopyFromIStreamSource(item, progressEvents, out pathNameResult);
}
else
{
CreateLocalCopyFromHttpSource(item, progressEvents, out pathNameResult);
}
returnResult = CopyResult.Success;
itemResult = WorkItemResult.Finished;
break;
}
catch (OperationCanceledException)
{
returnResult = CopyResult.CancelOperation;
itemResult = WorkItemResult.Skipped;
pathNameResult = null;
break;
}
catch (Exception ex)
{
WorkItemFailureAction choice = progressEvents.ReportItemFailure(ex);
if (choice == WorkItemFailureAction.SkipItem)
{
pathNameResult = null;
returnResult = CopyResult.Skipped;
itemResult = WorkItemResult.Skipped;
break;
}
else if (choice == WorkItemFailureAction.RetryItem)
{
continue;
}
else if (choice == WorkItemFailureAction.CancelOperation)
{
pathNameResult = null;
returnResult = CopyResult.CancelOperation;
itemResult = WorkItemResult.Skipped;
break;
}
}
}
progressEvents.EndItem(itemResult);
return(returnResult);
}
int NativeInterfaces.IFileDialogEvents.OnFileOk(NativeInterfaces.IFileDialog pfd)
{
int hr = NativeConstants.S_OK;
NativeInterfaces.IShellItemArray results = null;
FileOpenDialog.GetResults(out results);
uint count = 0;
results.GetCount(out count);
List <NativeInterfaces.IShellItem> items = new List <NativeInterfaces.IShellItem>();
List <NativeInterfaces.IShellItem> needLocalCopy = new List <NativeInterfaces.IShellItem>();
List <NativeInterfaces.IShellItem> cannotCopy = new List <NativeInterfaces.IShellItem>();
List <string> localPathNames = new List <string>();
for (uint i = 0; i < count; ++i)
{
NativeInterfaces.IShellItem item = null;
results.GetItemAt(i, out item);
items.Add(item);
}
foreach (NativeInterfaces.IShellItem item in items)
{
// If it's a file system object, nothing special needs to be done.
NativeConstants.SFGAO sfgaoAttribs;
item.GetAttributes((NativeConstants.SFGAO) 0xffffffff, out sfgaoAttribs);
if ((sfgaoAttribs & NativeConstants.SFGAO.SFGAO_FILESYSTEM) == NativeConstants.SFGAO.SFGAO_FILESYSTEM)
{
string pathName = null;
item.GetDisplayName(NativeConstants.SIGDN.SIGDN_FILESYSPATH, out pathName);
localPathNames.Add(pathName);
}
else if ((sfgaoAttribs & NativeConstants.SFGAO.SFGAO_STREAM) == NativeConstants.SFGAO.SFGAO_STREAM)
{
needLocalCopy.Add(item);
}
else
{
cannotCopy.Add(item);
}
}
Marshal.ReleaseComObject(results);
results = null;
if (needLocalCopy.Count > 0)
{
IntPtr hwnd = IntPtr.Zero;
NativeInterfaces.IOleWindow oleWindow = (NativeInterfaces.IOleWindow)pfd;
oleWindow.GetWindow(out hwnd);
Win32Window win32Window = new Win32Window(hwnd, oleWindow);
IFileTransferProgressEvents progressEvents = this.FileDialogUICallbacks.CreateFileTransferProgressEvents();
ThreadStart copyThreadProc =
delegate()
{
try
{
progressEvents.SetItemCount(needLocalCopy.Count);
for (int i = 0; i < needLocalCopy.Count; ++i)
{
NativeInterfaces.IShellItem item = needLocalCopy[i];
string pathName = null;
progressEvents.SetItemOrdinal(i);
CopyResult result = CreateLocalCopy(item, progressEvents, out pathName);
if (result == CopyResult.Success)
{
localPathNames.Add(pathName);
}
else if (result == CopyResult.Skipped)
{
// do nothing
}
else if (result == CopyResult.CancelOperation)
{
hr = NativeConstants.S_FALSE;
break;
}
else
{
throw new InvalidEnumArgumentException();
}
}
}
finally
{
OperationResult result;
if (hr == NativeConstants.S_OK)
{
result = OperationResult.Finished;
}
else
{
result = OperationResult.Canceled;
}
progressEvents.EndOperation(result);
}
};
Thread copyThread = new Thread(copyThreadProc);
copyThread.SetApartmentState(ApartmentState.STA);
EventHandler onUIShown =
delegate(object sender, EventArgs e)
{
copyThread.Start();
};
this.cancelSink = new CancelableTearOff();
progressEvents.BeginOperation(win32Window, onUIShown, cancelSink);
this.cancelSink = null;
copyThread.Join();
Marshal.ReleaseComObject(oleWindow);
oleWindow = null;
}
this.FileNames = localPathNames.ToArray();
// If they selected a bunch of files, and then they all errored or something, then don't proceed.
if (this.FileNames.Length == 0)
{
hr = NativeConstants.S_FALSE;
}
foreach (NativeInterfaces.IShellItem item in items)
{
Marshal.ReleaseComObject(item);
}
items.Clear();
items = null;
GC.KeepAlive(pfd);
return(hr);
}
private unsafe void CreateLocalCopyFromIStreamSource(
NativeInterfaces.IShellItem item,
IFileTransferProgressEvents progressEvents,
out string pathNameResult)
{
string fileName = null;
item.GetDisplayName(NativeConstants.SIGDN.SIGDN_NORMALDISPLAY, out fileName);
string pathName = FileSystem.GetTempPathName(fileName);
Guid bhidStream = NativeConstants.BHID_Stream;
Guid iid_IStream = new Guid(NativeConstants.IID_IStream);
NativeInterfaces.IStream iStream = null;
item.BindToHandler(IntPtr.Zero, ref bhidStream, ref iid_IStream, out iStream);
try
{
VerifyNotCanceled();
NativeStructs.STATSTG statstg = new NativeStructs.STATSTG();
iStream.Stat(out statstg, NativeConstants.STATFLAG.STATFLAG_NONAME);
progressEvents.SetItemWorkTotal((long)statstg.cbSize);
const int bufSize = 4096;
byte[] buffer = new byte[bufSize];
fixed (void* pbBuffer = buffer)
{
IntPtr pbBuffer2 = new IntPtr(pbBuffer);
ulong qwBytesLeft = statstg.cbSize;
using (FileStream localFile = new FileStream(pathName, FileMode.Create, FileAccess.Write, FileShare.Read))
{
VerifyNotCanceled();
// NOTE: We do not call VerifyNotCanceled() during any individual item. This is because, while testing
// this, it was determined that oftentimes the transfer gets very confused if we just stop
// calling Read() and jump straight to Marshal.ReleaseComObject(). By "confused" I mean that
// the "Canceling..." text would remain on the progress dialog for up to a minute, and then
// the blinking light on the camera would continue indefinitely and you wouldn't be able to
// use the camera again until you unplugged it and plugged it back in.
while (qwBytesLeft > 0)
{
uint wantToRead = (uint)Math.Min(qwBytesLeft, bufSize);
uint amtRead = 0;
iStream.Read(pbBuffer2, wantToRead, out amtRead);
if (amtRead > qwBytesLeft)
{
throw new InvalidOperationException("IStream::Read() reported that more bytes were read than were in the file");
}
qwBytesLeft -= amtRead;
localFile.Write(buffer, 0, (int)amtRead);
progressEvents.SetItemWorkProgress((long)(statstg.cbSize - qwBytesLeft));
}
}
VerifyNotCanceled();
}
}
finally
{
if (iStream != null)
{
try
{
Marshal.ReleaseComObject(iStream);
}
catch (Exception)
{
}
iStream = null;
}
}
pathNameResult = pathName;
}
private void CreateLocalCopyFromHttpSource(
NativeInterfaces.IShellItem item,
IFileTransferProgressEvents progressEvents,
out string pathNameResult)
{
string url = null;
item.GetDisplayName(NativeConstants.SIGDN.SIGDN_URL, out url);
Uri uri = new Uri(url);
string pathName = FileSystem.GetTempPathName(url);
WebRequest webRequest = WebRequest.Create(uri);
webRequest.Timeout = 5000;
using (WebResponse webResponse = webRequest.GetResponse())
{
VerifyNotCanceled();
using (Stream uriStream = webResponse.GetResponseStream())
{
VerifyNotCanceled();
using (FileStream outStream = new FileStream(pathName, FileMode.Create, FileAccess.Write, FileShare.Read))
{
VerifyNotCanceled();
const int bufSize = 512;
long length = webResponse.ContentLength;
long bytesLeft = length;
byte[] buffer = new byte[bufSize];
progressEvents.SetItemWorkTotal(length);
while (bytesLeft > 0)
{
int amtRead = uriStream.Read(buffer, 0, buffer.Length);
VerifyNotCanceled();
outStream.Write(buffer, 0, amtRead);
VerifyNotCanceled();
bytesLeft -= amtRead;
progressEvents.SetItemWorkProgress(length - bytesLeft);
VerifyNotCanceled();
}
}
}
}
pathNameResult = pathName;
}
// Returns true if the item copied successfully, false if it didn't (error or skipped)
private CopyResult CreateLocalCopy(
NativeInterfaces.IShellItem item,
IFileTransferProgressEvents progressEvents,
out string pathNameResult)
{
CopyResult returnResult;
WorkItemResult itemResult;
string displayName = null;
item.GetDisplayName(NativeConstants.SIGDN.SIGDN_NORMALDISPLAY, out displayName);
progressEvents.SetItemInfo(displayName);
progressEvents.BeginItem();
while (true)
{
// Determine whether to copy from HTTP or from IStream. The heuristic we use here is simple:
// if the attributes has SFGAO_CANCOPY, we IStream it. Else, we HTTP it.
NativeConstants.SFGAO attribs;
item.GetAttributes((NativeConstants.SFGAO)0xfffffff, out attribs);
try
{
if ((attribs & NativeConstants.SFGAO.SFGAO_CANCOPY) == NativeConstants.SFGAO.SFGAO_CANCOPY)
{
CreateLocalCopyFromIStreamSource(item, progressEvents, out pathNameResult);
}
else
{
CreateLocalCopyFromHttpSource(item, progressEvents, out pathNameResult);
}
returnResult = CopyResult.Success;
itemResult = WorkItemResult.Finished;
break;
}
catch (OperationCanceledException)
{
returnResult = CopyResult.CancelOperation;
itemResult = WorkItemResult.Skipped;
pathNameResult = null;
break;
}
catch (Exception ex)
{
WorkItemFailureAction choice = progressEvents.ReportItemFailure(ex);
if (choice == WorkItemFailureAction.SkipItem)
{
pathNameResult = null;
returnResult = CopyResult.Skipped;
itemResult = WorkItemResult.Skipped;
break;
}
else if (choice == WorkItemFailureAction.RetryItem)
{
continue;
}
else if (choice == WorkItemFailureAction.CancelOperation)
{
pathNameResult = null;
returnResult = CopyResult.CancelOperation;
itemResult = WorkItemResult.Skipped;
break;
}
}
}
progressEvents.EndItem(itemResult);
return returnResult;
}
