///<Summary>Given an IntPtr pointing to a CIDA,
/// copy the CIDA to a new MemoryStream</Summary>
private MemoryStream MakeStreamFromCIDA(IntPtr ptr)
{
MemoryStream returnValue;
returnValue = null; //assume failure
if (ptr.Equals(IntPtr.Zero))
{
return(returnValue);
}
int nrItems = Marshal.ReadInt32(ptr, 0);
if (!(nrItems > 0))
{
return(returnValue);
}
int[] offsets = new int[nrItems + 1];
int curB = 4; //already read first 4
int i;
for (i = 0; i <= nrItems; i++)
{
offsets[i] = Marshal.ReadInt32(ptr, curB);
curB += 4;
}
int pidlLen = 0;
object[] pidlobjs = new object[nrItems + 1];
for (i = 0; i <= nrItems; i++)
{
IntPtr ipt = new IntPtr(ptr.ToInt32() + offsets[i]);
ExpTreeLib.CShItem.cPidl cp = new ExpTreeLib.CShItem.cPidl(ipt);
pidlobjs[i] = cp.PidlBytes;
pidlLen += ((byte[])(pidlobjs[i])).Length;
}
returnValue = new MemoryStream(pidlLen + (4 * offsets.Length) + 4);
BinaryWriter BW = new BinaryWriter(returnValue);
BW.Write(nrItems);
for (i = 0; i <= nrItems; i++)
{
BW.Write(offsets[i]);
}
for (i = 0; i <= nrItems; i++)
{
BW.Write((byte[])(pidlobjs[i]));
}
// DumpHex(MakeStreamFromCIDA.ToArray)
returnValue.Seek(0, SeekOrigin.Begin);
return(returnValue);
}
///<Summary>Given an IntPtr pointing to a CIDA,
/// copy the CIDA to a new MemoryStream</Summary>
private MemoryStream MakeStreamFromCIDA(IntPtr ptr)
{
MemoryStream returnValue;
returnValue = null; //assume failure
if (ptr.Equals(IntPtr.Zero))
{
return returnValue;
}
int nrItems = Marshal.ReadInt32(ptr, 0);
if (!(nrItems > 0))
{
return returnValue;
}
int[] offsets = new int[nrItems + 1];
int curB = 4; //already read first 4
int i;
for (i = 0; i <= nrItems; i++)
{
offsets[i] = Marshal.ReadInt32(ptr, curB);
curB += 4;
}
int pidlLen = 0;
object[] pidlobjs = new object[nrItems + 1];
for (i = 0; i <= nrItems; i++)
{
IntPtr ipt = new IntPtr(ptr.ToInt32() + offsets[i]);
ExpTreeLib.CShItem.cPidl cp = new ExpTreeLib.CShItem.cPidl(ipt);
pidlobjs[i] = cp.PidlBytes;
pidlLen += ((byte[]) (pidlobjs[i])).Length;
}
returnValue = new MemoryStream(pidlLen + (4 * offsets.Length) + 4);
BinaryWriter BW = new BinaryWriter(returnValue);
BW.Write(nrItems);
for (i = 0; i <= nrItems; i++)
{
BW.Write(offsets[i]);
}
for (i = 0; i <= nrItems; i++)
{
BW.Write((byte[]) (pidlobjs[i]));
}
// DumpHex(MakeStreamFromCIDA.ToArray)
returnValue.Seek(0, SeekOrigin.Begin);
return returnValue;
}
///<Summary>
/// Shell Folders prefer their IDragData to contain this format which is
/// NOT directly supported by .Net. The underlying structure is the CIDA structure
/// which is basically VB and VB.Net Hostile.
///If "Make ShortCut(s) here" is the desired or
/// POSSIBLE effect of the drag, then this format is REQUIRED -- otherwise the
/// Folder will interpret the DragDropEffects.Link to be "Create Document Shortcut"
/// which is NEVER the desired effect in this case
/// The normal CIDA contains the Absolute PIDL of the source Folder and
/// Relative PIDLs for each Item in the Drag.
/// I cheat a bit an provide the Absolute PIDL of the Desktop (00, a short)
/// and the Absolute PIDLs for the Items (all such Absolute PIDLS ar
/// relative to the Desktop.
///</Summary>
///<Credit>http://www.dotnetmonster.com/Uwe/Forum.aspx/dotnet-interop/3482/Drag-and-Drop
/// The overall concept and much code taken from the above reference
/// Dave Anderson's response, translated from C# to VB.Net, was the basis
/// of this routine
/// An AHA momemnt and a ref to the above url came from
///http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=61324%26lngWId=1
///
///</Credit>
public static System.IO.MemoryStream MakeShellIDArray(ArrayList CSIList)
{
System.IO.MemoryStream returnValue;
//ensure that we have an arraylist of only CShItems
Type AllowedType = typeof(CShItem);
object oCSI;
foreach (object tempLoopVar_oCSI in CSIList)
{
oCSI = tempLoopVar_oCSI;
if (!AllowedType.Equals(oCSI.GetType()))
{
return(null);
}
}
//ensure at least one item
if (CSIList.Count < 1)
{
return(null);
}
//bArrays is an Array of Byte() each containing the bytes of a PIDL
object[] bArrays = new object[CSIList.Count];
CShItem CSI;
int i = 0;
foreach (CShItem tempLoopVar_CSI in CSIList)
{
CSI = tempLoopVar_CSI;
bArrays[i] = new ExpTreeLib.CShItem.cPidl(CSI.PIDL).PidlBytes;
i++;
}
returnValue = new System.IO.MemoryStream();
System.IO.BinaryWriter BW = new System.IO.BinaryWriter(returnValue);
BW.Write(Convert.ToUInt32(CSIList.Count)); //we don't count the parent (Desktop)
int Desktop = 0; //we only use the lowval 2 bytes (VB lacks meaninful uint)
int Offset; //offset into Structure of a PIDL
// Calculate and write the offset to each pidl (defined as an array of uint32)
// The first pidl is 2 bytes long (0 0) and represents the desktop
// The 2 in the statement below is for the offset to the
// folder pidl and the count field in the CIDA structure
Offset = Marshal.SizeOf(typeof(UInt32)) * (bArrays.Length + 2);
BW.Write(Convert.ToUInt32(Offset)); //offset to desktop pidl
Offset += 2; //Marshal.SizeOf(GetType(UInt16)) 'point to the next one
for (i = 0; i <= bArrays.Length - 1; i++)
{
BW.Write(Convert.ToUInt32(Offset));
Offset += ((byte[])(bArrays[i])).Length;
}
//done with the array of offsets, write the parent pidl (0 0) = Desktop
BW.Write(Convert.ToUInt16(Desktop));
//Write the pidl bytes
byte[] b;
foreach (byte[] tempLoopVar_b in bArrays)
{
b = tempLoopVar_b;
BW.Write(b);
}
//done, returning the memorystream
Debug.WriteLine("Done MakeShellIDArray");
return(returnValue);
}
///<Summary>
/// Shell Folders prefer their IDragData to contain this format which is
/// NOT directly supported by .Net. The underlying structure is the CIDA structure
/// which is basically VB and VB.Net Hostile.
///If "Make ShortCut(s) here" is the desired or
/// POSSIBLE effect of the drag, then this format is REQUIRED -- otherwise the
/// Folder will interpret the DragDropEffects.Link to be "Create Document Shortcut"
/// which is NEVER the desired effect in this case
/// The normal CIDA contains the Absolute PIDL of the source Folder and
/// Relative PIDLs for each Item in the Drag.
/// I cheat a bit an provide the Absolute PIDL of the Desktop (00, a short)
/// and the Absolute PIDLs for the Items (all such Absolute PIDLS ar
/// relative to the Desktop.
///</Summary>
///<Credit>http://www.dotnetmonster.com/Uwe/Forum.aspx/dotnet-interop/3482/Drag-and-Drop
/// The overall concept and much code taken from the above reference
/// Dave Anderson's response, translated from C# to VB.Net, was the basis
/// of this routine
/// An AHA momemnt and a ref to the above url came from
///http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=61324%26lngWId=1
///
///</Credit>
public static System.IO.MemoryStream MakeShellIDArray(ArrayList CSIList)
{
System.IO.MemoryStream returnValue;
//ensure that we have an arraylist of only CShItems
Type AllowedType = typeof(CShItem);
object oCSI;
foreach (object tempLoopVar_oCSI in CSIList)
{
oCSI = tempLoopVar_oCSI;
if (! AllowedType.Equals(oCSI.GetType()))
{
return null;
}
}
//ensure at least one item
if (CSIList.Count < 1)
{
return null;
}
//bArrays is an Array of Byte() each containing the bytes of a PIDL
object[] bArrays = new object[CSIList.Count];
CShItem CSI;
int i = 0;
foreach (CShItem tempLoopVar_CSI in CSIList)
{
CSI = tempLoopVar_CSI;
bArrays[i] = new ExpTreeLib.CShItem.cPidl(CSI.PIDL).PidlBytes;
i++;
}
returnValue = new System.IO.MemoryStream();
System.IO.BinaryWriter BW = new System.IO.BinaryWriter(returnValue);
BW.Write(Convert.ToUInt32(CSIList.Count)); //we don't count the parent (Desktop)
int Desktop = 0; //we only use the lowval 2 bytes (VB lacks meaninful uint)
int Offset; //offset into Structure of a PIDL
// Calculate and write the offset to each pidl (defined as an array of uint32)
// The first pidl is 2 bytes long (0 0) and represents the desktop
// The 2 in the statement below is for the offset to the
// folder pidl and the count field in the CIDA structure
Offset = Marshal.SizeOf(typeof(UInt32)) * (bArrays.Length + 2);
BW.Write(Convert.ToUInt32(Offset)); //offset to desktop pidl
Offset += 2; //Marshal.SizeOf(GetType(UInt16)) 'point to the next one
for (i = 0; i <= bArrays.Length - 1; i++)
{
BW.Write(Convert.ToUInt32(Offset));
Offset += ((byte[]) (bArrays[i])).Length;
}
//done with the array of offsets, write the parent pidl (0 0) = Desktop
BW.Write(Convert.ToUInt16(Desktop));
//Write the pidl bytes
byte[] b;
foreach (byte[] tempLoopVar_b in bArrays)
{
b = tempLoopVar_b;
BW.Write(b);
}
//done, returning the memorystream
Debug.WriteLine("Done MakeShellIDArray");
return returnValue;
}
