how to pass the arguments to procedure to close the window

hi,this is part of my code.in this code when i execute the code first time it will create one borderless window in which the command line arguments will scroll.when i execute the same code second time in presence of the previous banner running it should close the previous banner and open the new window and the arguments whatever i pass will scroll in that newly created banner.
i want single instance of banner. i also want to know how to pass the arguments to procedure.

part of code:

Code:

using std::string;

using namespace std;

WNDCLASSEX  WndCls;

HWND hwnd;

LRESULT CALLBACK WindProcedure(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
 
CString string1,string2="",string3="";

string pre_lines="";




LPWSTR *szArglist;		//holds commandline arguments
   int nArgs;
   int i,j,k,l;
  

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow)
{
//string1.Format("%-0s",lpCmdLine);

    static char szAppName[] = "GDISuite";
    MSG         Msg;

    WndCls.cbSize        = sizeof(WndCls);
    WndCls.style         = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;
    WndCls.lpfnWndProc   = WindProcedure;
    WndCls.cbClsExtra    = 0;
    WndCls.cbWndExtra    = 0;
    WndCls.hInstance     = hInstance;
    WndCls.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    WndCls.hCursor       = LoadCursor(NULL, IDC_ARROW);
    WndCls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    WndCls.lpszMenuName  = NULL;
    WndCls.lpszClassName = szAppName;
    WndCls.hIconSm       = LoadIcon(hInstance, IDI_APPLICATION);
    RegisterClassEx(&WndCls);


	//creates window

    CreateWindowEx(WS_EX_OVERLAPPEDWINDOW | WS_EX_TOPMOST,
                          szAppName,
                          "GDI Accessories and Tools",
                          WS_POPUPWINDOW | WS_VISIBLE,
                          0,
                          0,
                          1500,
                          50,
		NULL,
                          NULL,
                          hInstance,
                          NULL);

    while( GetMessage(&Msg, NULL, 0, 0) )
    {
        TranslateMessage(&Msg);
        DispatchMessage( &Msg);
    }

    return static_cast<int>(Msg.wParam);
}

LRESULT CALLBACK WindProcedure(HWND hWnd, UINT Msg,
			   WPARAM wParam, LPARAM lParam)
{
	HDC hDC;
         PAINTSTRUCT Ps;
		 int a;

	switch(Msg)
	{
	
	case WM_PAINT:

		szArglist = CommandLineToArgvW(GetCommandLineW(), &nArgs);

		if( NULL == szArglist )
		{
			wprintf(L"CommandLineToArgvW failed\n");
			return 0;
		}

		if( (CString)szArglist[1]=="a")
		{
	
		/*if(FindWindow("szAppName","GDI Accessories and Tools")!=NULL)
		{
			DestroyWindow(hWnd);
		}*/
			
			ifstream myfile7;

			myfile7.open  ("C:\\cmd.txt"); 

			//sText="EOD has not been started yet";

			if(myfile7.is_open())

			{

		while (! myfile7.eof() )

		{

		       string pline="";

		      getline (myfile7,pline);

		       pre_lines+=(pline+"\n"); 

						
	            }

	}

			myfile7.close();

			for( i=2; i<nArgs; i++)
				{ 
					string1=(CString)szArglist[i];

					string2=string2+" "+string1;
				}


			CString str=pre_lines.c_str();
			string3=str+" "+string2;

			ofstream myfile4; 

					myfile4.open("C:\\cmd.txt");

					if (myfile4.is_open())

					{


				myfile4 << pre_lines << string(string2);

					}

					myfile4.close();

			
			do
				{
			hDC = BeginPaint(hWnd, &Ps);
			TextOut(hDC, 10, 1,"Priority 1 Issues:",20);

			for(a=1;a<1100;a++)
			{
					
		TextOut(hDC, a+10, 18,string2,string2.GetLength());
		EndPaint(hWnd, &Ps);
		Sleep(10);
						
			}
					
		}while(!_kbhit());

		}	

		else if( (CString)szArglist[1]=="r")
		{
			ifstream myfile7;

			myfile7.open  ("C:\\cmd.txt"); 

			//sText="EOD has not been started yet";

			if(myfile7.is_open())

			{

			while (! myfile7.eof() )

			{

			string pline="";

			getline (myfile7,pline);

			pre_lines+=(pline+"\n"); 						
		}

			}

			myfile7.close();
			
				CString str1=pre_lines.c_str();

			for( i=2; i<nArgs; i++)
				{ 
					string1=(CString)szArglist[i];
					string2=string2+string1;
					//char s[]=(string)str1;
					//j=InStr(string1,str1)-1;
					k = string2.GetLength();
					j=str1.Find(string2);
					if (j<k)
					{

					for(l=j ;l<k+1;l++)
		
					str1.SetAt(j,' ');
					if(j!=0)
					{
								                                                      string1="";
					}
					string2=string1;
					}
					else if(j>k)
					{
						for(l=j ;l<j+k+1;l++)
						str1.SetAt(l,' ');
						if(j!=0)
						{
							string1="";
						}
						string2=string1;
					}
					else
					{
		AfxMessageBox("The entered String  do not match");
					}
		
			}

			CString str=pre_lines.c_str();
			string3=str+" "+string2;

			ofstream myfile4; 

			myfile4.open("C:\\cmd.txt");

		            if (myfile4.is_open())

		          {


		              //myfile4 << pre_lines << string(str1);
			myfile4 << string(str1);

		           }

			myfile4.close();

			
			do
				{
				hDC = BeginPaint(hWnd, &Ps);
			TextOut(hDC, 10, 1,"Priority 1 Issues:",20);

			for(a=1;a<1100;a++)
			{
			TextOut(hDC, a+10, 18,str1,str1.GetLength());
			EndPaint(hWnd, &Ps);
			Sleep(10);	
		             }	
		}while(!_kbhit());

		}


		
		else
		{
		 for( i=1; i<nArgs; i++)
			{ 
			string1=(CString)szArglist[i];
			string2=string2+string1;
			}

			ofstream myfile4; 

			myfile4.open("C:\\cmd.txt");

			if (myfile4.is_open())

			{


			myfile4 << string(string2);

			}

			myfile4.close();
					
			do
			{
			hDC = BeginPaint(hWnd, &Ps);

			for(a=1;a<1100;a++)
			{
		TextOut(hDC, a+10, 6,string2,string2.GetLength());
				EndPaint(hWnd, &Ps);
				Sleep(10);
						
			}
					
		}while(!_kbhit());
			break;
		}

		case WM_DESTROY:
		PostQuitMessage(WM_QUIT);
		break;
	default:
		return DefWindowProc(hWnd, Msg, wParam, lParam);
	}
	return 0;
}