P4Server.internal.cs #1

/*******************************************************************************

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	notice, this list of conditions and the following disclaimer in the
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/*******************************************************************************
 * Name		: P4Server.internal.cs
 *
 * Author	: dbb
 *
 * Description	: Classes used to wrap calls in the P4Bridge DLL in C#.
 *
 ******************************************************************************/
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using System.Text;
using System.IO;
using System.Threading;

namespace Perforce.P4
{
	/// <summary>
	/// P4Server
	/// 
	/// Represents the connection to a Perforce Server using the the P4 Bridge 
	/// DLL. It wraps the calls exported by the DLL and transforms the data
	/// types exported by the DLL as native C#.NET data types.
	/// </summary>
	/// <remarks>
	/// This file contains the internal data a methods that are not part of the
	/// public interface
	/// </remarks>
	partial class P4Server
	{
		/// <summary>
		/// P4Encoding
		/// 
		/// How do we encode Unicode UTF-16 strings, the .NET internal format
		/// before sending them to the bridge dll?
		/// </summary>
		internal enum P4Encoding : int
		{
			ASCII = 0, // required for non Unicode 
			//     enabled servers
			utf8 = 1, // P4's 'native' encoding

			utf16 = 2, // Windows preferred encoding 
			//     for Unicode files
			utf16bom = 3
		};

		String[] Charset = { String.Empty, "utf8", "utf16le", "utf16le-bom" };

		// default encoding to ASCII
		private P4Encoding CurrentEncodeing = P4Encoding.ASCII;

		/// <summary>
		/// Is the server Unicode enabled
		/// </summary>
		private bool isUnicode;

		/// <summary>
		/// What API level does the server support
		/// </summary>
		private int apiLevel;

		/// <summary>
		/// Does the server require the login command be used
		/// </summary>
		private bool requiresLogin;

		/// <summary>
		/// Marshall a returned pointer as a UTF-16 encoded string
		/// </summary>
		/// <param name="pStr"> Native pointer to the string</param>
		/// <returns>UTF-16 String</returns>
		internal String MarshalPtrToStringUtf16(IntPtr pStr)
		{
			if (pStr == IntPtr.Zero)
				return null;

			if (UseUnicode)
				return Marshal.PtrToStringUni(pStr);
			else
				return Marshal.PtrToStringAnsi(pStr);
		}

		/// <summary>
		/// Marshall a returned pointer as a UTF-8 encoded string
		/// </summary>
		/// <param name="pStr"> Native pointer to the string</param>
		/// <returns>UTF-16 String</returns>
		static internal String MarshalPtrToStringUtf8_Int(IntPtr pStr)
		{
			if (pStr == IntPtr.Zero)
				return null;

			// there is no Marshall utility to directly translate
			// the strings encoding, so we need to copy it into a
			// byte[] and use the Encoding.UTF8 class to translate.
			Encoding utf8 = Encoding.UTF8;
			int cnt = 0;
			// count the characters till a null
			while (Marshal.ReadByte(pStr, cnt) != 0)
				cnt++;
			byte[] StrBytes = new byte[cnt]; //+ 1 ];
			for (int idx = 0; idx < cnt; idx++)
				StrBytes[idx] = Marshal.ReadByte(pStr, idx);
			return utf8.GetString(StrBytes);
		}

		/// <summary>
		/// Marshall a returned pointer as a UTF-8 encoded string
		/// </summary>
		/// <param name="pStr"> Native pointer to the string</param>
		/// <returns>UTF-16 String</returns>
		internal String MarshalPtrToStringUtf8(IntPtr pStr)
		{
			if (pStr == IntPtr.Zero)
				return null;

			if (UseUnicode)
			{
				return MarshalPtrToStringUtf8_Int(pStr);
			}
			else
				return Marshal.PtrToStringAnsi(pStr);
		}

		/// <summary>
		/// Translate a returned string based on the current encoding
		/// </summary>
		/// <param name="pStr"> Native pointer to the string</param>
		/// <returns>UTF-16 String</returns>
		internal String MarshalPtrToString(IntPtr pStr)
		{
			try
			{
				switch (CurrentEncodeing)
				{
					case P4Encoding.utf8:
						return MarshalPtrToStringUtf8(pStr);
					case P4Encoding.utf16:
						return MarshalPtrToStringUtf16(pStr);
					default:
					case P4Encoding.ASCII:
						return Marshal.PtrToStringAnsi(pStr);
				}
			}
			catch (Exception ex)
			{
				LogFile.LogException("MarshalPtrToString", ex);
				return null;
			}
		}

		/// <summary>
		/// Convert a returned c++ byte pointer (void *) to a byte[]
		/// </summary>
		/// <param name="pData">byte pointer</param>
		/// <param name="byteCnt">byte count</param>
		/// <returns>Converted byte[]</returns>
		internal byte[] MarshalPtrToByteArrary(IntPtr pData, int byteCnt)
		{
			// allocate a new byte[] to hold the data
			byte[] data = new byte[byteCnt];

			// copy each byte
			for (int idx = 0; idx < byteCnt; idx++)
				data[idx] = Marshal.ReadByte(pData, idx);

			return data;
		}

		/// <summary>
		/// Marshal a String[] into an array of native pointers to strings
		/// in the correct encoding for Unicode enabled servers
		/// </summary>
		/// <param name="args">The args to encode</param>
		/// <param name="argc">Count of args to encode</param>
		/// <returns>Array of IntPtrs to encoded strings</returns>
		internal PinnedByteArrays
			MarshalStringArrayToIntPtrArray(String[] args,
											  int argc)
		{
			Encoding encode = Encoding.Unicode;
			switch (CurrentEncodeing)
			{
				case P4Encoding.utf8:
					encode = Encoding.UTF8;
					break;
				case P4Encoding.utf16:
					encode = Encoding.Unicode;
					break;
			}

			PinnedByteArray[] args_b = new PinnedByteArray[argc];

			for (int i = 0; i < argc; i++)
			{
				//null terminate the strings
				byte[] arg_b = encode.GetBytes(args[i] + '\0');
				args_b[i] = new PinnedByteArray(arg_b);
			}
			return new PinnedByteArrays(args_b);
		}

		//        static GCHandle nullGCHandle = new GCHandle();

		/// <summary>
		/// Marshal a String into the correct encoding to pass to a Unicode
		/// enabled server.
		/// </summary>
		/// <param name="arg">String to encode</param>
		/// <returns>IntPtr of the encoded string</returns>
		internal PinnedByteArray MarshalStringToIntPtr(String arg)
		{
			if (arg == null)
			{
				return null;
			}
			Encoding encode = Encoding.UTF8;
			switch (CurrentEncodeing)
			{
				case P4Encoding.utf8:
					encode = Encoding.UTF8;
					break;
				case P4Encoding.utf16:
					encode = Encoding.Unicode;
					break;
			}
			//null terminate the string
			byte[] bytes = encode.GetBytes(arg + '\0');

			return new PinnedByteArray(bytes);
		}

		/// <summary>
		/// Marshal a String into the correct encoding to pass to a Unicode
		/// enabled server.
		/// </summary>
		/// <param name="arg">String to encode</param>
		/// <returns>IntPtr of the encoded string</returns>
		static internal PinnedByteArray MarshalStringToIntPtr(Encoding encode, String arg)
		{
			if (arg == null)
			{
				return null;
			}
			//null terminate the string
			byte[] bytes = encode.GetBytes(arg + '\0');

			return new PinnedByteArray(bytes);
		}

		internal void  CopyStringToIntPtr(String src, IntPtr dst, int maxBytes )
		{
			Encoding encode = Encoding.UTF8;
			switch (CurrentEncodeing)
			{
				case P4Encoding.utf8:
					encode = Encoding.UTF8;
					break;
				case P4Encoding.utf16:
					encode = Encoding.Unicode;
					break;
			}
			//null terminate the string
			byte[] bytes = encode.GetBytes(src + '\0');

			int max = bytes.Length;
			if (max > maxBytes)
			{
				max = maxBytes;
				// make sure the string ends with a null
				bytes[maxBytes - 1] = 0; 
			}
			Marshal.Copy(bytes, 0, dst, max);
		}

		/// <summary>
		/// Handle (pointer) to the P4BridgeServer wrapped by this P4Server
		/// </summary>
		internal IntPtr pServer = IntPtr.Zero;

		/// <summary>
		/// Internal creator for unit testing other classes
		/// </summary>
		/// <param name="unicode"></param>
		/// 
		internal P4Server(bool unicode)
		{
			isUnicode = unicode;
			if (unicode)
			{
				CurrentEncodeing = P4Encoding.utf8;
			}
		}

		/// <summary>
		/// Set the character set encoding used to pass parameters to a Unicode
		/// enabled server.
		/// </summary>
		/// <remarks>
		/// This is handled automatically after connecting with a P4 server.
		/// </remarks>
		/// <param name="charSet"></param>
		/// <param name="FileCharSet"></param>
		internal void SetCharacterSet(String charSet, String FileCharSet)
		{
			IntPtr pErrorStr = P4Bridge.SetCharacterSet(pServer, charSet, FileCharSet);

			if (pErrorStr == IntPtr.Zero)  // no error
				return;

			String ErrorMsg = MarshalPtrToString(pErrorStr);
			throw new P4Exception(ErrorSeverity.E_FAILED, ErrorMsg);
		}

		/// <summary>
		/// Holds the call back passed to the bridge used to receive the 
		/// individual key:value pairs for an object 
		/// </summary>
		internal P4CallBacks.TaggedOutputDelegate
			TaggedOutputCallbackFn_Int = null;

		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr pTaggedOutputCallbackFn = IntPtr.Zero;

		/// <summary>
		/// Used to build up an object as its key:value pairs are received
		/// </summary>
		internal TaggedObject CurrentObject = null;

		//We'll receive multiple calls for each StrDict object, one for each 
		//  key:value pair that will get combined into a single TaggedObject.

		/// <summary>
		/// Delegate used to send real time tagged results generated by a 
		/// command
		/// </summary>
		/// <remarks>
		/// We receive multiple calls for each StrDict object, one for each 
		/// key:value pair that will get combined into a single TaggedObject used
		/// to represent an 'object'. This client delegate receives a single
		/// TaggedObject representing the complete object.
		/// </remarks>
		internal void SetTaggedOutputCallback()
		{
			if (TaggedOutputCallbackFn_Int == null)
			{
				// initialize on first setting
				TaggedOutputCallbackFn_Int =
					new P4CallBacks.TaggedOutputDelegate(TaggedOutputCallback_Int);
				pTaggedOutputCallbackFn = Marshal.GetFunctionPointerForDelegate(TaggedOutputCallbackFn_Int);
				P4Bridge.SetTaggedOutputCallbackFn(pServer, pTaggedOutputCallbackFn);
			}
		}

		object TaggedOutputCallback_Int_Sync = new object();

		/// <summary>
		/// Internal callback used to receive the individual Key:Value pair 
		/// data for an object
		/// </summary>
		/// We receive multiple calls for each StrDict object, one for each 
		/// key:value pair that will get combined into a single TaggedObject used
		/// to represent an 'object'. Object IDs are unique for the objects
		/// returned by a single command, but are not unique across commands.
		/// <remarks>
		/// </remarks>
		/// <param name="objID">Object ID assigned by the bridge</param>
		/// <param name="Key">Key for this entry</param>
		/// <param name="pValue">Value for this entry</param>
		internal void TaggedOutputCallback_Int( uint cmdId,
												int objID,
												String Key,
												IntPtr pValue)
		{
			lock (TaggedOutputCallback_Int_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
					// no callback set, so ignore
					if (TaggedOutputReceived == null)
						return;

					if ((!String.IsNullOrEmpty(Key)) && (pValue != IntPtr.Zero))
					{
						if (CurrentObject == null)
							CurrentObject = new TaggedObject();

						CurrentObject[Key] = MarshalPtrToString(pValue);
					}
					else
					{
						Delegate[] targetList = TaggedOutputReceived.GetInvocationList();
						foreach (TaggedOutputDelegate d in targetList)
						{
							try
							{
								d(cmdId, objID, CurrentObject);
							}
							catch
							{
								// problem with delegate, so remove from the list
								TaggedOutputReceived -= d;
							}
						}
						//get ready for the next object
						CurrentObject = null;
					}
				}
				finally
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}
		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr pErrorCallbackFn = IntPtr.Zero;

		object ErrorCallback_Int_Sync = new object();

		/// <summary>
		/// Internal callback used to receive the raw data. 
		/// </summary>
		/// The text data pointed to by a char* is marshaled into a String
		/// <remarks>
		/// </remarks>
		/// <param name="severity">Severity level</param>
		/// <param name="pData">char* pointer for error message</param>
		internal void ErrorCallback_Int(uint cmdId, int severity, int errorNumber, IntPtr pData)
		{
			lock (ErrorCallback_Int_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
                    //System.Console.WriteLine("NOMO ErrorCallback_Int called");
					// no callback set, so ignore
					if (ErrorReceived == null)
						return;
                    //System.Console.WriteLine("NOMO ErrorCallback_Int 2 called");

					String data = null;
					if (pData != IntPtr.Zero)
					{
						data = MarshalPtrToString(pData);
					}

					Delegate[] targetList = ErrorReceived.GetInvocationList();
					foreach (ErrorDelegate d in targetList)
					{
						try
						{
							d(cmdId, severity, errorNumber, data);
						}
						catch
						{
							// problem with delegate, so remove from the list
							ErrorReceived -= d;
						}
					}
				}
				finally
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}

		/// <summary>
		/// Set the callback used to return real time Errors.
		/// </summary>
		internal void SetErrorCallback()
		{
			if (ErrorCallbackFn_Int == null)
			{
				// initialize on first setting
				ErrorCallbackFn_Int =
					new P4CallBacks.ErrorDelegate(ErrorCallback_Int);
				pErrorCallbackFn = Marshal.GetFunctionPointerForDelegate(ErrorCallbackFn_Int);
				P4Bridge.SetErrorCallbackFn(pServer, pErrorCallbackFn);
			}
		}

		/// <summary>
		/// Holds the call back passed to the bridge used to receive the 
		/// raw  data 
		/// </summary>
		P4CallBacks.InfoResultsDelegate
			InfoResultsCallbackFn_Int = null;

		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr pInfoResultsCallbackFn = IntPtr.Zero;

		object InfoResultsCallback_Sync = new object();

		/// <summary>
		/// Internal callback used to receive the raw data. 
		/// </summary>
		/// The text data pointed to by a char* is marshaled into a String
		/// <remarks>
		/// </remarks>
		/// <param name="level">message level</param>
		/// <param name="pData">char* pointer to message</param>
		internal void InfoResultsCallback_Int(uint cmdId, int msgId, int level, IntPtr pData)
		{
			lock (InfoResultsCallback_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
					// no callback set, so ignore
					if (InfoResultsReceived == null)
						return;

					String data = null;
					if (pData != IntPtr.Zero)
					{
						data = MarshalPtrToString(pData);
					}

					Delegate[] targetList = InfoResultsReceived.GetInvocationList();
					foreach (InfoResultsDelegate d in targetList)
					{
						try
						{
							d(cmdId, msgId, level, data);
						}
						catch
						{
							// problem with delegate, so remove from the list
							InfoResultsReceived -= d;
						}
					}
				}
				finally
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}

		/// <summary>
		/// Set the callback used to return real time info output.
		/// </summary>
		internal void SetInfoResultsCallback() //InfoResultsDelegate cb )
		{
			if (InfoResultsCallbackFn_Int == null)
			{
				// initialize on first setting
				InfoResultsCallbackFn_Int =
					new P4CallBacks.InfoResultsDelegate(InfoResultsCallback_Int);
				pInfoResultsCallbackFn = Marshal.GetFunctionPointerForDelegate(InfoResultsCallbackFn_Int);
				P4Bridge.SetInfoResultsCallbackFn(pServer, pInfoResultsCallbackFn);
			}
		}

		/// <summary>
		/// Holds the call back passed to the bridge used to receive the 
		/// raw binary data 
		/// </summary>
		P4CallBacks.TextResultsDelegate
			TextResultsCallbackFn_Int = null;

		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr pTextResultsCallbackFn = IntPtr.Zero;

		object TextResultsCallback_Int_Sync = new object();

		/// <summary>
		/// Internal callback used to receive the raw text data. 
		/// </summary>
		/// The text data pointed to by a char* is marshaled into a String
		/// <remarks>
		/// </remarks>
		/// <param name="pData">char* pointer</param>
		internal void TextResultsCallback_Int(uint cmdId, IntPtr pData)
		{
			lock (TextResultsCallback_Int_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
					// no callback set, so ignore
					if (TextResultsReceived == null)
						return;

					String data = null;
					if (pData != IntPtr.Zero)
					{
						data = MarshalPtrToString(pData);
					}

					Delegate[] targetList = TextResultsReceived.GetInvocationList();
					foreach (TextResultsDelegate d in targetList)
					{
						try
						{
							d(cmdId, data);
						}
						catch
						{
							// problem with delegate, so remove from the list
							TextResultsReceived -= d;
						}
					}
				}
				finally
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}

		/// <summary>
		/// Set the callback used to return real time text output.
		/// </summary>
		/// <remarks>
		/// Far large output, the client may receive multiple callbacks.
		/// Simply concatenate the data to get the complete data.
		/// </remarks>
		internal void SetTextResultsCallback()
		{
			if (TextResultsCallbackFn_Int == null)
			{
				// initialize on first setting
				TextResultsCallbackFn_Int =
					new P4CallBacks.TextResultsDelegate(TextResultsCallback_Int);
				pTextResultsCallbackFn = Marshal.GetFunctionPointerForDelegate(TextResultsCallbackFn_Int);
				P4Bridge.SetTextResultsCallbackFn(pServer, pTextResultsCallbackFn);
			}
		}

		/// <summary>
		/// Holds the call back passed to the bridge used to receive the 
		/// raw binary data 
		/// </summary>
		P4CallBacks.BinaryResultsDelegate
			BinaryResultsCallbackFn_Int = null;

		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr pBinaryResultsCallbackFn = IntPtr.Zero;

		object BinaryResultsCallback_Int_Sync = new object();

		/// <summary>
		/// Internal callback used to receive the raw binary data. 
		/// </summary>
		/// The binary data pointed to by a void* is marshaled into a byte[]
		/// <remarks>
		/// </remarks>
		/// <param name="pData">void* pointer</param>
		/// <param name="cnt">Byte count</param>
		internal void BinaryResultsCallback_Int(uint cmdId, IntPtr pData, int cnt)
		{
			lock (BinaryResultsCallback_Int_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
					// no callback set, so ignore
					if (BinaryResultsReceived == null)
						return;

					byte[] data = null;
					if (pData != IntPtr.Zero)
					{
						data = MarshalPtrToByteArrary(pData, cnt);
					}

					Delegate[] targetList = BinaryResultsReceived.GetInvocationList();
					foreach (BinaryResultsDelegate d in targetList)
					{
						try
						{
							d(cmdId, data);
						}
						catch
						{
							// problem with delegate, so remove from the list
							BinaryResultsReceived -= d;
						}
					}
				}
				finally
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}

		/// <summary>
		/// Set the callback used to return real time binary output.
		/// </summary>
		/// <remarks>
		/// Far large output, the client may receive multiple callbacks.
		/// Simply concatenate the data to get the complete data.
		/// </remarks>
		internal void SetBinaryResultsCallback()
		{
			if (BinaryResultsCallbackFn_Int == null)
			{
				// initialize on first setting
				BinaryResultsCallbackFn_Int =
					new P4CallBacks.BinaryResultsDelegate(BinaryResultsCallback_Int);
				pBinaryResultsCallbackFn = Marshal.GetFunctionPointerForDelegate(BinaryResultsCallbackFn_Int);
				P4Bridge.SetBinaryResultsCallbackFn(pServer, pBinaryResultsCallbackFn);
			}
		}

		/// <summary>
		/// Holds the call back passed to the bridge used to receive input 
		/// prompts from the server
		/// </summary>
		P4CallBacks.PromptDelegate
		   PromptCallbackFn_Int = null;

		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr pPromptCallbackFn = IntPtr.Zero;

		object PromptCallback_Int_Sync = new object();

		internal void PromptCallback_Int(uint cmdId, IntPtr pMsg, IntPtr pRspBuf, int buffSize, bool display)
		{
			lock (PromptCallback_Int_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
					// no callback set, so ignore
					if (PromptHandler == null)
						return;

					String msg = null;
					if (pMsg != IntPtr.Zero)
					{
						msg = MarshalPtrToString(pMsg);
					}

					String response = null;
					try
					{
						response = PromptHandler(cmdId, msg, display);
					}
					catch
					{
						// problem with delegate, so clear it
						PromptHandler = null;
					}
					CopyStringToIntPtr(response, pRspBuf, buffSize);
				}
				finally 
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}

		internal void SetPromptCallback()
		{
			if (PromptCallbackFn_Int == null)
			{
				// initialize on first setting
				PromptCallbackFn_Int =
					new P4CallBacks.PromptDelegate(PromptCallback_Int);
				pPromptCallbackFn = Marshal.GetFunctionPointerForDelegate(PromptCallbackFn_Int);
				P4Bridge.SetPromptCallbackFn(pServer, pPromptCallbackFn);
			}
		}

		/// <summary>
		/// Holds the call back passed to the bridge used to receive resolve callbacks 
		/// with a ClientMerge object from the server
		/// </summary>
		P4CallBacks.ResolveDelegate
		   ResolveCallbackFn_Int = null;

		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr ResolveCallbackFn = IntPtr.Zero;

		object ResolveCallback_Int_Sync = new object();

		internal int ResolveCallback_Int(uint cmdId, IntPtr pMerger)
		{
			lock (ResolveCallback_Int_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
					P4ClientMerge.MergeStatus result = P4ClientMerge.MergeStatus.CMS_NONE;

					// no callback set, so ignore
					if (ResolveHandler == null)
						return -1;

					P4ClientMerge Merger = null;
					if (pMerger != IntPtr.Zero)
					{
						Merger = new P4ClientMerge(this, pMerger);
					}

					try
					{
						result = ResolveHandler(cmdId, Merger);
					}
					catch
					{
						// problem with delegate, so clear it
						PromptHandler = null;
						result = P4ClientMerge.MergeStatus.CMS_QUIT;
					}
					return (int)result;
				}
				finally
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}

		internal void SetResolveCallback()
		{
			if (ResolveCallbackFn_Int == null)
			{
				// initialize on first setting
				ResolveCallbackFn_Int =
					new P4CallBacks.ResolveDelegate(ResolveCallback_Int);
				ResolveCallbackFn = Marshal.GetFunctionPointerForDelegate(ResolveCallbackFn_Int);
				P4ClientMergeBridge.SetResolveCallbackFn(pServer, ResolveCallbackFn);
			}
		}
		/// <summary>
		/// Holds the call back passed to the bridge used to receive resolve callbacks 
		/// with a ClientResolve object from the server
		/// </summary>
		P4CallBacks.ResolveADelegate
			ResolveACallbackFn_Int = null;

		/// <summary>
		/// Pinned function pointer for the delegate passed to the dll
		/// </summary>
		IntPtr ResolveACallbackFn = IntPtr.Zero;

		object ResolveACallback_Int_Sync = new object();

		internal int ResolveACallback_Int(uint cmdId, IntPtr pResolver, bool Preview)
		{
			lock (ResolveACallback_Int_Sync)
			{
				PauseRunCmdTimer(cmdId);
				try
				{
					P4ClientMerge.MergeStatus result = P4ClientMerge.MergeStatus.CMS_NONE;

					// no callback set, so ignore
					if (ResolveAHandler == null)
						return -1;

					P4ClientResolve Resolver = null;
					if (pResolver != IntPtr.Zero)
					{
						Resolver = new P4ClientResolve(this, pResolver);
					}

					try
					{
						result = ResolveAHandler(cmdId, Resolver);
					}
					catch
					{
						// problem with delegate, so clear it
						PromptHandler = null;
						result = P4ClientMerge.MergeStatus.CMS_QUIT;
					}
					return (int)result;
				}
				finally
				{
					ContinueRunCmdTimer(cmdId);
				}
			}
		}

		internal void SetResolveACallback()
		{
			if (ResolveACallbackFn_Int == null)
			{
				// initialize on first setting
				ResolveACallbackFn_Int =
					new P4CallBacks.ResolveADelegate(ResolveACallback_Int);
				ResolveACallbackFn = Marshal.GetFunctionPointerForDelegate(ResolveACallbackFn_Int);
				P4ClientResolveBridge.SetResolveACallbackFn(pServer, ResolveACallbackFn);
			}
		}
	}
}