public static Stream CreateFileGroupDescriptorW(string fileName, DateTimeOffset lastWriteTime)
{
var fileGroupDescriptor = new FILEGROUPDESCRIPTORW()
{
cItems = 1
};
var fileDescriptor = new FILEDESCRIPTORW()
{
cFileName = fileName
};
fileDescriptor.dwFlags |= FD_SHOWPROGRESSUI;
fileDescriptor.dwFlags |= FD_CREATETIME | FD_WRITESTIME;
var changeTime = lastWriteTime.ToLocalTime().ToFileTime();
var changeTimeFileTime = new System.Runtime.InteropServices.ComTypes.FILETIME
{
dwLowDateTime = (int)(changeTime & 0xffffffff),
dwHighDateTime = (int)(changeTime >> 32),
};
fileDescriptor.ftLastWriteTime = changeTimeFileTime;
fileDescriptor.ftCreationTime = changeTimeFileTime;
var fileGroupDescriptorBytes = StructureBytes(fileGroupDescriptor);
var fileDescriptorBytes = StructureBytes(fileDescriptor);
var memoryStream = new MemoryStream();
memoryStream.Write(fileGroupDescriptorBytes, 0, fileGroupDescriptorBytes.Length);
memoryStream.Write(fileDescriptorBytes, 0, fileDescriptorBytes.Length);
return(memoryStream);
}
public static Stream CreateFileGroupDescriptorW(string fileName, DateTimeOffset lastWriteTime, long?fileSize)
{
var fileGroupDescriptor = new FILEGROUPDESCRIPTORW()
{
cItems = 1
};
var fileDescriptor = new FILEDESCRIPTORW()
{
cFileName = fileName
};
fileDescriptor.dwFlags |= FD_SHOWPROGRESSUI;
if (lastWriteTime != default)
{
fileDescriptor.dwFlags |= FD_CREATETIME | FD_WRITESTIME;
var changeTime = lastWriteTime.ToFileTime();
var changeTimeFileTime = new System.Runtime.InteropServices.ComTypes.FILETIME
{
dwLowDateTime = (int)(changeTime & 0xffffffff),
dwHighDateTime = (int)(changeTime >> 32),
};
fileDescriptor.ftLastWriteTime = changeTimeFileTime;
fileDescriptor.ftCreationTime = changeTimeFileTime;
}
if (fileSize.HasValue)
{
fileDescriptor.dwFlags |= FD_FILESIZE;
// TODO: remove ! once https://github.com/dotnet/roslyn/issues/33330 is fixed
fileDescriptor.nFileSizeLow = (uint)(fileSize & 0xffffffff) !;
fileDescriptor.nFileSizeHigh = (uint)(fileSize >> 32) !;
}
var fileGroupDescriptorBytes = StructureBytes(fileGroupDescriptor);
var fileDescriptorBytes = StructureBytes(fileDescriptor);
var memoryStream = new MemoryStream();
memoryStream.Write(fileGroupDescriptorBytes, 0, fileGroupDescriptorBytes.Length);
memoryStream.Write(fileDescriptorBytes, 0, fileDescriptorBytes.Length);
return(memoryStream);
}
/// <summary>
/// Retrieves the data associated with the specified data format, using a Boolean to determine whether to convert the data to the format.
/// </summary>
/// <param name="format">The format of the data to retrieve. See <see cref="T:System.Windows.DataFormats"></see> for predefined formats.</param>
/// <param name="autoConvert">true to convert the data to the specified format; otherwise, false.</param>
/// <returns>
/// The data associated with the specified format, or null.
/// </returns>
public object GetData(string format, bool autoConvert)
{
//handle the "FileGroupDescriptor" and "FileContents" format request in this class otherwise pass through to underlying IDataObject
switch (format)
{
case "FileGroupDescriptor":
//override the default handling of FileGroupDescriptor which returns a
//MemoryStream and instead return a string array of file names
IntPtr fileGroupDescriptorAPointer = IntPtr.Zero;
try
{
//use the underlying IDataObject to get the FileGroupDescriptor as a MemoryStream
MemoryStream fileGroupDescriptorStream = (MemoryStream)this._underlyingDataObject.GetData("FileGroupDescriptor", autoConvert);
byte[] fileGroupDescriptorBytes = new byte[fileGroupDescriptorStream.Length];
fileGroupDescriptorStream.Read(fileGroupDescriptorBytes, 0, fileGroupDescriptorBytes.Length);
fileGroupDescriptorStream.Close();
//copy the file group descriptor into unmanaged memory
fileGroupDescriptorAPointer = Marshal.AllocHGlobal(fileGroupDescriptorBytes.Length);
Marshal.Copy(fileGroupDescriptorBytes, 0, fileGroupDescriptorAPointer, fileGroupDescriptorBytes.Length);
//marshal the unmanaged memory to to FILEGROUPDESCRIPTORA struct
object fileGroupDescriptorObject = Marshal.PtrToStructure(fileGroupDescriptorAPointer, typeof(FILEGROUPDESCRIPTORA));
FILEGROUPDESCRIPTORA fileGroupDescriptor = (FILEGROUPDESCRIPTORA)fileGroupDescriptorObject;
//create a new array to store file names in of the number of items in the file group descriptor
string[] fileNames = new string[fileGroupDescriptor.cItems];
//get the pointer to the first file descriptor
IntPtr fileDescriptorPointer = (IntPtr)((int)fileGroupDescriptorAPointer + Marshal.SizeOf(fileGroupDescriptorAPointer));
//loop for the number of files acording to the file group descriptor
for (int fileDescriptorIndex = 0; fileDescriptorIndex < fileGroupDescriptor.cItems; fileDescriptorIndex++)
{
//marshal the pointer top the file descriptor as a FILEDESCRIPTORA struct and get the file name
FILEDESCRIPTORA fileDescriptor = (FILEDESCRIPTORA)Marshal.PtrToStructure(fileDescriptorPointer, typeof(FILEDESCRIPTORA));
fileNames[fileDescriptorIndex] = fileDescriptor.cFileName;
//move the file descriptor pointer to the next file descriptor
fileDescriptorPointer = (IntPtr)((int)fileDescriptorPointer + Marshal.SizeOf(fileDescriptor));
}
//return the array of filenames
return(fileNames);
}
finally
{
//free unmanaged memory pointer
Marshal.FreeHGlobal(fileGroupDescriptorAPointer);
}
case "FileGroupDescriptorW":
//override the default handling of FileGroupDescriptorW which returns a
//MemoryStream and instead return a string array of file names
IntPtr fileGroupDescriptorWPointer = IntPtr.Zero;
try
{
//use the underlying IDataObject to get the FileGroupDescriptorW as a MemoryStream
MemoryStream fileGroupDescriptorStream = (MemoryStream)this._underlyingDataObject.GetData("FileGroupDescriptorW");
byte[] fileGroupDescriptorBytes = new byte[fileGroupDescriptorStream.Length];
fileGroupDescriptorStream.Read(fileGroupDescriptorBytes, 0, fileGroupDescriptorBytes.Length);
fileGroupDescriptorStream.Close();
//copy the file group descriptor into unmanaged memory
fileGroupDescriptorWPointer = Marshal.AllocHGlobal(fileGroupDescriptorBytes.Length);
Marshal.Copy(fileGroupDescriptorBytes, 0, fileGroupDescriptorWPointer, fileGroupDescriptorBytes.Length);
//marshal the unmanaged memory to to FILEGROUPDESCRIPTORW struct
object fileGroupDescriptorObject = Marshal.PtrToStructure(fileGroupDescriptorWPointer, typeof(FILEGROUPDESCRIPTORW));
FILEGROUPDESCRIPTORW fileGroupDescriptor = (FILEGROUPDESCRIPTORW)fileGroupDescriptorObject;
//create a new array to store file names in of the number of items in the file group descriptor
string[] fileNames = new string[fileGroupDescriptor.cItems];
//get the pointer to the first file descriptor
IntPtr fileDescriptorPointer = (IntPtr)((int)fileGroupDescriptorWPointer + Marshal.SizeOf(fileGroupDescriptorWPointer));
//loop for the number of files acording to the file group descriptor
for (int fileDescriptorIndex = 0; fileDescriptorIndex < fileGroupDescriptor.cItems; fileDescriptorIndex++)
{
//marshal the pointer top the file descriptor as a FILEDESCRIPTORW struct and get the file name
FILEDESCRIPTORW fileDescriptor = (FILEDESCRIPTORW)Marshal.PtrToStructure(fileDescriptorPointer, typeof(FILEDESCRIPTORW));
fileNames[fileDescriptorIndex] = fileDescriptor.cFileName;
//move the file descriptor pointer to the next file descriptor
fileDescriptorPointer = (IntPtr)((int)fileDescriptorPointer + Marshal.SizeOf(fileDescriptor));
}
//return the array of filenames
return(fileNames);
}
finally
{
//free unmanaged memory pointer
Marshal.FreeHGlobal(fileGroupDescriptorWPointer);
}
case "FileContents":
//override the default handling of FileContents which returns the
//contents of the first file as a memory stream and instead return
//a array of MemoryStreams containing the data to each file dropped
//get the array of filenames which lets us know how many file contents exist
string[] fileContentNames = (string[])this.GetData("FileGroupDescriptor");
//create a MemoryStream array to store the file contents
MemoryStream[] fileContents = new MemoryStream[fileContentNames.Length];
//loop for the number of files acording to the file names
for (int fileIndex = 0; fileIndex < fileContentNames.Length; fileIndex++)
{
//get the data at the file index and store in array
fileContents[fileIndex] = this.GetData(format, fileIndex);
}
//return array of MemoryStreams containing file contents
return(fileContents);
}
//use underlying IDataObject to handle getting of data
return(this._underlyingDataObject.GetData(format, autoConvert));
}
