private MemoryStream GetFileDescriptor(OleDataObjectItem[] SelectedItems)
{
MemoryStream FileDescriptorMemoryStream = new MemoryStream();
// Write out the FILEGROUPDESCRIPTOR.cItems value
FileDescriptorMemoryStream.Write(BitConverter.GetBytes(SelectedItems.Length), 0, sizeof(UInt32));
Win32.NativeMethods.FILEDESCRIPTORW FileDescriptor = new Win32.NativeMethods.FILEDESCRIPTORW();
foreach (OleDataObjectItem si in SelectedItems)
{
FileDescriptor.cFileName = si.FileName;
Int64 FileWriteTimeUtc = si.WriteTime.ToFileTimeUtc();
FileDescriptor.ftLastWriteTime.dwHighDateTime = (Int32)(FileWriteTimeUtc >> 32);
FileDescriptor.ftLastWriteTime.dwLowDateTime = (Int32)(FileWriteTimeUtc & 0xFFFFFFFF);
FileDescriptor.nFileSizeHigh = (UInt32)(si.FileSize >> 32);
FileDescriptor.nFileSizeLow = (UInt32)(si.FileSize & 0xFFFFFFFF);
FileDescriptor.dwFlags = Win32.NativeMethods.FD_WRITESTIME | Win32.NativeMethods.FD_FILESIZE | Win32.NativeMethods.FD_PROGRESSUI;
// Marshal the FileDescriptor structure into a byte array and write it to the MemoryStream.
Int32 FileDescriptorSize = Marshal.SizeOf(FileDescriptor);
IntPtr FileDescriptorPointer = Marshal.AllocHGlobal(FileDescriptorSize);
Marshal.StructureToPtr(FileDescriptor, FileDescriptorPointer, true);
Byte[] FileDescriptorByteArray = new Byte[FileDescriptorSize];
Marshal.Copy(FileDescriptorPointer, FileDescriptorByteArray, 0, FileDescriptorSize);
Marshal.FreeHGlobal(FileDescriptorPointer);
FileDescriptorMemoryStream.Write(FileDescriptorByteArray, 0, FileDescriptorByteArray.Length);
}
return(FileDescriptorMemoryStream);
}
private MemoryStream GetFileDescriptor(OleDataObjectItem[] SelectedItems)
{
MemoryStream FileDescriptorMemoryStream = new MemoryStream();
// Write out the FILEGROUPDESCRIPTOR.cItems value
FileDescriptorMemoryStream.Write(BitConverter.GetBytes(SelectedItems.Length), 0, sizeof(UInt32));
Win32.NativeMethods.FILEDESCRIPTORW FileDescriptor = new Win32.NativeMethods.FILEDESCRIPTORW();
foreach (OleDataObjectItem si in SelectedItems)
{
FileDescriptor.cFileName = si.FileName;
Int64 FileWriteTimeUtc = si.WriteTime.ToFileTimeUtc();
FileDescriptor.ftLastWriteTime.dwHighDateTime = (Int32)(FileWriteTimeUtc >> 32);
FileDescriptor.ftLastWriteTime.dwLowDateTime = (Int32)(FileWriteTimeUtc & 0xFFFFFFFF);
FileDescriptor.nFileSizeHigh = (UInt32)(si.FileSize >> 32);
FileDescriptor.nFileSizeLow = (UInt32)(si.FileSize & 0xFFFFFFFF);
FileDescriptor.dwFlags = Win32.NativeMethods.FD_WRITESTIME | Win32.NativeMethods.FD_FILESIZE | Win32.NativeMethods.FD_PROGRESSUI;
// Marshal the FileDescriptor structure into a byte array and write it to the MemoryStream.
Int32 FileDescriptorSize = Marshal.SizeOf(FileDescriptor);
IntPtr FileDescriptorPointer = Marshal.AllocHGlobal(FileDescriptorSize);
Marshal.StructureToPtr(FileDescriptor, FileDescriptorPointer, true);
Byte[] FileDescriptorByteArray = new Byte[FileDescriptorSize];
Marshal.Copy(FileDescriptorPointer, FileDescriptorByteArray, 0, FileDescriptorSize);
Marshal.FreeHGlobal(FileDescriptorPointer);
FileDescriptorMemoryStream.Write(FileDescriptorByteArray, 0, FileDescriptorByteArray.Length);
}
return FileDescriptorMemoryStream;
}
/// <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.Forms.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);
//read the cItem from the FILEGROUPDESCRIPTORA
int fileDescriptorCount = Marshal.ReadInt32(fileGroupDescriptorAPointer);
//create a new array to store file names in of the number of items in the file group descriptor
string[] fileNames = new string[fileDescriptorCount];
//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 < fileDescriptorCount; fileDescriptorIndex++)
{
//marshal the pointer top the file descriptor as a FILEDESCRIPTORA struct and get the file name
Win32.NativeMethods.FILEDESCRIPTORA fileDescriptor = (Win32.NativeMethods.FILEDESCRIPTORA)Marshal.PtrToStructure(fileDescriptorPointer, typeof(Win32.NativeMethods.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);
//read the cItem from the FILEGROUPDESCRIPTORW
int fileDescriptorCount = Marshal.ReadInt32(fileGroupDescriptorWPointer);
//create a new array to store file names in of the number of items in the file group descriptor
string[] fileNames = new string[fileDescriptorCount];
//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 < fileDescriptorCount; fileDescriptorIndex++)
{
//marshal the pointer top the file descriptor as a FILEDESCRIPTORW struct and get the file name
Win32.NativeMethods.FILEDESCRIPTORW fileDescriptor = (Win32.NativeMethods.FILEDESCRIPTORW)Marshal.PtrToStructure(fileDescriptorPointer, typeof(Win32.NativeMethods.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));
}
