using System;
using System.Text;	//for StringBuilder
using System.Windows.Forms;	//for MessageBox
using System.Reflection;	//for Assembly
using System.Runtime.InteropServices;

namespace cs03
{
	public class custFileDlg
	{
		[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
		public class OPENFILENAME
		{	public uint lStructSize=0;
			public IntPtr hwndOwner=IntPtr.Zero;
			public IntPtr hInstance=IntPtr.Zero;
			public string lpstrFilter=null;
			public string lpstrCustomFilter=null;
			public uint nMaxCustFilter=0;
			public uint nFilterIndex=0;
			public string lpstrFile=null;
			public uint nMaxFile=0;
			public string lpstrFileTitle=null;
			public uint nMaxFileTitle=0;
			public string lpstrInitialDir=null;
			public string lpstrTitle=null;
			public uint Flags=0;
			public ushort nFileOffset=0;
			public ushort nFileExtension=0;
			public string lpstrDefExt=null;
			public uint lCustData=0;
			public OFNHookProc lpfnHook;
			public IntPtr lpTemplateName;
			//#if(_WIN32_WINNT >= 0x0500)
				public IntPtr pvReserved=IntPtr.Zero;
				public uint dwReserved=0;
				public uint FlagsEx=0;
		}

		public const uint OFN_ALLOWMULTISELECT=0x200;
		public const uint OFN_CREATEPROMPT=0x2000;
		public const uint OFN_ENABLEHOOK=0x20;
		public const uint OFN_ENABLETEMPLATE=0x40;
		public const uint OFN_ENABLETEMPLATEHANDLE=0x80;
		public const uint OFN_ENABLEINCLUDENOTIFY=0x00400000;
		public const uint OFN_ENABLESIZING=0x00800000;
		public const uint OFN_EXPLORER=0x80000;
		public const uint OFN_EXTENSIONDIFFERENT=0x400;
		public const uint OFN_FILEMUSTEXIST=0x1000;
		public const uint OFN_HIDEREADONLY=0x4;
		public const uint OFN_LONGNAMES=0x200000;
		public const uint OFN_NOCHANGEDIR=0x8;
		public const uint OFN_NODEREFERENCELINKS=0x100000;
		public const uint OFN_NOLONGNAMES=0x40000;
		public const uint OFN_NONETWORKBUTTON=0x20000;
		public const uint OFN_NOREADONLYRETURN=0x8000;
		public const uint OFN_NOTESTFILECREATE=0x10000;
		public const uint OFN_NOVALIDATE=0x100;
		public const uint OFN_DONTADDTORECENT=0x02000000;
		public const uint OFN_OVERWRITEPROMPT=0x2;
		public const uint OFN_PATHMUSTEXIST=0x800;
		public const uint OFN_READONLY=0x1;
		public const uint OFN_SHAREAWARE=0x4000;
		public const uint OFN_SHAREFALLTHROUGH=2;
		public const uint OFN_SHARENOWARN=1;
		public const uint OFN_SHAREWARN=0;
		public const uint OFN_SHOWHELP=0x10;

		public const uint CDN_FIRST=unchecked(0U-601U);
		public const uint CDN_INITDONE=CDN_FIRST;
		public const uint CDN_SELCHANGE=CDN_FIRST-0x0001;
		public const uint CDN_FOLDERCHANGE=CDN_FIRST-0x0002;
		public const uint CDN_SHAREVIOLATION=CDN_FIRST-0x0003;
		public const uint CDN_HELP=CDN_FIRST-0x0004;
		public const uint CDN_FILEOK=CDN_FIRST-0x0005;
		public const uint CDN_TYPECHANGE=CDN_FIRST-0x0006;
		public const uint CDN_INCLUDEITEM=CDN_FIRST-0x0007;

		public const int WM_USER=0x0400;
		public const int CDM_FIRST=WM_USER+100;
		public const int CDM_GETSPEC=CDM_FIRST+0x0000;
		public const int CDM_GETFILEPATH=CDM_FIRST+0x0001;
		public const int CDM_GETFOLDERPATH=CDM_FIRST+0x0002;
		public const int CDM_GETFOLDERIDLIST=CDM_FIRST+0x0003;
		public const int CDM_SETCONTROLTEXT=CDM_FIRST+0x0004;
		public const int CDM_HIDECONTROL=CDM_FIRST+0x0005;
		public const int CDM_SETDEFEXT=CDM_FIRST+0x0006;

		[StructLayout(LayoutKind.Sequential)]
		public struct NMHDR
		{	public IntPtr hwndFrom;
			public uint idFrom;
			public uint code;
		}

		public const int WM_COMMAND=0x0111;
		public const int WM_SETFOCUS=0x0007;
		public const int WM_INITDIALOG=0x0110;
		public const int WM_LBUTTONDOWN=0x0201;
		public const int WM_RBUTTONDOWN=0x0204;
		public const int WM_MOVE=0x0003;
		public const int WM_NOTIFY=0x004e;
		
		public const int LB_RESETCONTENT=0x184;
		public const int LB_ADDSTRING=0x180;
		public const int LB_GETSEL=0x187;
		public const int LB_SETHORIZONTALEXTENT=0x193;
		public const int LB_GETCOUNT=0x18b;
		public const int LB_SETCURSEL=0x186;
		public const int LB_GETCURSEL=0x188;
		public const int LB_GETTEXT=0x189;
		public const int LB_GETTEXTLEN=0x18a;
		public const int LB_FINDSTRING=0x18f;
		public const int LB_ERR=-1;
		
		public const int IDOK=1;
		public const int IDCANCEL=2;
		public const int IDC_EDIT_FIND=1000;
		public const int IDC_EDIT_REPLACE=1001;
		public const int IDC_STATIC_VIEW=1002;
		public const int IDC_STATIC_STATE=1003;
		public const int IDC_STATIC_FIND=1004;
		public const int IDC_STATIC_REPLACE=1005;
		public const int IDC_BUTTON_FIND=1007;
		public const int IDC_BUTTON_REPLACE=1008;
		public const int IDC_LIST_FOUND=1009;
		public const int IDC_TAB=1010;

		[DllImport( "Comdlg32.dll",CharSet=CharSet.Auto)]public static extern bool GetOpenFileName([ In, Out ] OPENFILENAME ofn );

		[DllImport("User32")]public static extern IntPtr GetParent(IntPtr hWnd);
		[DllImport("User32",CharSet=CharSet.Auto)]public static extern uint SetDlgItemText(IntPtr hDlg,int nIDDlgItem,string lpString);

		[DllImport("User32",CharSet=CharSet.Auto)]public static extern uint GetDlgItemText(IntPtr hDlg,int nIDDlgItem,[MarshalAs(UnmanagedType.LPTStr)]string lpString,int nMaxCount);
		[DllImport("User32",CharSet=CharSet.Auto)]public static extern uint GetDlgItemText(IntPtr hDlg,int nIDDlgItem,[MarshalAs(UnmanagedType.LPTStr)]StringBuilder lpString,int nMaxCount);
		[DllImport("User32",CharSet=CharSet.Auto)]public static extern IntPtr GetDlgItem(IntPtr hDlg,int nIDDlgItem);

		[DllImport("User32",CharSet=CharSet.Auto)]public static extern int SendMessage(IntPtr hWnd,uint Msg,uint wParam,uint lParam);
		[DllImport("User32",CharSet=CharSet.Auto)]public static extern int SendMessage(IntPtr hWnd,uint Msg,uint wParam,[MarshalAs(UnmanagedType.LPTStr)]string lParam);
		[DllImport("User32",CharSet=CharSet.Auto)]public static extern int SendMessage(IntPtr hWnd,uint Msg,uint wParam,[MarshalAs(UnmanagedType.LPTStr)]StringBuilder lParam);
		
		public const int DWL_MSGRESULT=0;
		[DllImport("User32",CharSet=CharSet.Auto)]public static extern int SetWindowLong(IntPtr hWnd,int nIndex,int dwNewLong);
		[DllImport("User32",CharSet=CharSet.Auto)]public static extern int GetWindowLong(IntPtr hWnd,int nIndex);
   
		public custFileDlg(){}

		public delegate uint OFNHookProc(IntPtr hdlg,uint uiMsg,uint wParam,uint lParam);

		public const int MAX_PATH=260;
		public const int FILES=128;

		public static OPENFILENAME ofn=null;

		protected virtual uint hookProc(IntPtr hdlg,uint uiMsg,uint wParam,uint lParam)
		{	switch(uiMsg)
			{	case WM_INITDIALOG:
					ofn=(OPENFILENAME)Marshal.PtrToStructure(new IntPtr(lParam),typeof(OPENFILENAME));
					MessageBox.Show(ofn.lpstrTitle);
					SendMessage(GetDlgItem(hdlg,IDC_LIST_FOUND),LB_RESETCONTENT,0,0);
					return 1;
				case WM_COMMAND:
					switch(wParam)
					{	case IDC_BUTTON_FIND:
						case IDC_BUTTON_REPLACE:
							string findPattern=new string(new char[MAX_PATH]);
							string replaceString=new string(new char[MAX_PATH]);
							if(0 < GetDlgItemText(hdlg,IDC_EDIT_FIND,findPattern,findPattern.Length))
								MessageBox.Show(findPattern);
							if(0 < GetDlgItemText(hdlg,IDC_EDIT_FIND,findPattern,findPattern.Length)
								&& 0!=GetDlgItemText(hdlg,IDC_EDIT_REPLACE,replaceString,replaceString.Length))
							{	char sep='\0';	//string strSep="\",; \t";char[] seps=sepstr.ToCharArray();
								MessageBox.Show("Replace "+findPattern.Split(sep)[0]+" by "+replaceString.Split(sep)[0] + "?");
							}
							return 1;
					}
					break;
				case WM_NOTIFY:
					NMHDR hdr=(NMHDR)Marshal.PtrToStructure(new IntPtr(lParam),typeof(NMHDR));
					switch((uint)hdr.code)
					{	case CDN_INITDONE:
							SendMessage(GetParent(hdlg),CDM_HIDECONTROL,IDOK,0);
							SetDlgItemText(GetParent(hdlg),IDCANCEL,"&Quit");
							SendMessage(GetDlgItem(hdlg,IDC_LIST_FOUND),LB_ADDSTRING,0,"CDN_INITDONE");
							return 1;
						case CDN_FILEOK:
							SetWindowLong(hdlg,DWL_MSGRESULT,-1);	//for [ENTER]
							return 1;
						case CDN_SHAREVIOLATION:
							SendMessage(GetDlgItem(hdlg,IDC_LIST_FOUND),LB_ADDSTRING,0,"CDN_SHAREVIOLATION");
							break;
						case CDN_FOLDERCHANGE:
							string path=new string(new char[MAX_PATH]);
							SendMessage(GetParent(hdlg),CDM_GETFOLDERPATH,(uint)path.Length,path);
							SendMessage(GetDlgItem(hdlg,IDC_LIST_FOUND),LB_ADDSTRING,0,"CDN_FOLDERCHANGE"+path);
							return 1;
						case CDN_SELCHANGE:
							//StringBuilder sb=new StringBuilder();	//too difficult
							string file=new string(new char[MAX_PATH*FILES]);
							//if(0 < SendMessage(GetParent(hdlg),CDM_GETSPEC,(uint)file.Length,file))
							if(0 < SendMessage(GetParent(hdlg),CDM_GETFILEPATH,(uint)file.Length,file))
								SetDlgItemText(hdlg,IDC_STATIC_STATE,file);
							break;
					}
					break;
			}
			return 0;
		}

		public string strInitialDir="C:\\";
		public string strTitle="Choose some files";
		string strFilter="";
		uint dwFlags=0;

		public string Filter
		{	get{return strFilter;}
			set{strFilter=value;}
		}
		
		public uint Flags
		{	get{return dwFlags;}
			set{dwFlags=value;}
		}
		
		public DialogResult ShowDialog()
		{	const int IDD_DIALOG1=101;

			OPENFILENAME ofn=new OPENFILENAME();
			ofn.lStructSize=(uint)Marshal.SizeOf(ofn);
			ofn.hInstance=Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]);
			ofn.lpstrFilter=strFilter;
			ofn.lpstrFile=new String(new char[MAX_PATH*FILES]);
			ofn.nMaxFile=(uint)ofn.lpstrFile.Length;
//			ofn.lpstrFileTitle=new String(new char[MAX_PATH]);
//			ofn.nMaxFileTitle=(uint)ofn.lpstrFileTitle.Length;
			ofn.lpstrInitialDir=strInitialDir;
			ofn.lpstrTitle=strTitle;
			ofn.Flags=dwFlags;
			ofn.lpfnHook=new OFNHookProc(hookProc);
			ofn.lpTemplateName=new IntPtr(IDD_DIALOG1);

			if(GetOpenFileName(ofn))return DialogResult.OK;
			else return DialogResult.Cancel;
		}
	}

	public class TestDialog
	{
		public static void Main()
		{
			custFileDlg cfd=new custFileDlg();
			cfd.Filter="DWG(*.dwg)\0*.dwg\0DXF(*.dxf)\0*.dxf\0";
			cfd.Flags=custFileDlg.OFN_DONTADDTORECENT |
				custFileDlg.OFN_NONETWORKBUTTON |
				custFileDlg.OFN_SHAREFALLTHROUGH |
				custFileDlg.OFN_EXPLORER |
				custFileDlg.OFN_LONGNAMES |
				custFileDlg.OFN_PATHMUSTEXIST |
				custFileDlg.OFN_ENABLEHOOK |
				custFileDlg.OFN_ENABLETEMPLATE |
				custFileDlg.OFN_ENABLESIZING |
				custFileDlg.OFN_ALLOWMULTISELECT;
			cfd.ShowDialog();
		}
	}
}