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From: koziol@yoyodyne.ncsa.uiuc.edu (Quincey Koziol)
Newsgroups: comp.windows.ms.programmer
Subject: How to open two windows from one application
Summary: how do you open two windows?
Keywords: multiple windows
Message-ID: <1991Apr12.181046.14531@ux1.cso.uiuc.edu>
Date: 12 Apr 91 18:10:46 GMT
Sender: koziol@ncsa.uiuc.edu
Organization: National Center for Supercomputing Applications at Urbana Illinois
Lines: 150


Ok, I'm stumped.  How does one open two windows from one Windows App?  I have
tried so many combinations I'm really getting sick of this problem.  Attached
below is the relevant section of my current iteration of the code:

===============================================================================

char far szAppName[] = "SciVis";       /* App. name           */
char far szPalName[] = "SciVis_Pal";   /* Name of the palette window */

typedef struct info_node {  /* structure for information about the window */
    WORD WindowWidth,       /* the width and height of the data int the window in pixels */
        WindowHeight;
  } wind_info;

typedef struct wind_node {  /* a structure which contains all the information needed to display a window on the screen */
    HPALETTE hWindPal;      /* handle to the window's palette */
    HANDLE hdibWindow;      /* handle to the window's DIB */
    HBITMAP hbmWindow;      /* handle to the window's BM */
    HANDLE hbiWindow;       /* handle to the window's BitmapInfo */
  } window;

HPALETTE hpalCurrent = NULL;/* Handle to current palette           */
HANDLE hdibCurrent = NULL;	/* Handle to current memory DIB	       */
HBITMAP hbmCurrent = NULL;	/* Handle to current memory BITMAP      */
HANDLE hbiCurrent = NULL;	/* Handle to current bitmap info struct */

WORD wBitmapWidth,wBitmapHeight,    /* width and height of the bitmap loaded currently */
    wDisplayWidth,wDisplayHeight;   /* width and height of the bitmap displayed currently */
HWND hWndApp;               /* Handle to app. window           */
HWND hDebugWnd;             /* Handle to the debugging window */
HWND hPaletteWnd;           /* Handle to the palette window */

short xScreen, yScreen;     /* size of the screen */
short xFrame, yFrame;       /* frame around the sizeable window */
short MenuHeight;           /* height of the menu bar */
short CaptionHeight;        /* height of caption */

/* Styles of app. window */
DWORD dwStyle = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MAXIMIZEBOX | WS_MINIMIZEBOX | WS_THICKFRAME;

DWORD dwPalStyle = DS_MODALFRAME | WS_OVERLAPPED | DS_NOIDLEMSG | WS_CAPTION | WS_BORDER ;

/****************************************************************************
 *									    *
 *  FUNCTION   : WinMain(HANDLE, HANDLE, LPSTR, int)			    *
 *									    *
 *  PURPOSE    : Creates the app. window and enters the message loop.	    *
 *									    *
 ****************************************************************************/
int PASCAL WinMain(hInstance, hPrevInstance, lpszCmdLine, nCmdShow)
HANDLE hInstance, hPrevInstance;
LPSTR lpszCmdLine;
int nCmdShow;
{
	HWND hWnd;
    WNDCLASS wndclass;
    WNDCLASS palclass;
    FARPROC lpProc;
	MSG msg;
	char ach[40];

	hInst = hInstance;

	/* default to MEMORY DIB's if XWindows */
	bMemoryDIB = WinFlags & WF_PMODE;

	/* Initialize clip rectangle */
	SetRectEmpty(&rcClip);

    /* get a procedure instance for the palette window */
    lpProc=MakeProcInstance((FARPROC)PalWndProc,hInst);

	if (!hPrevInstance) {
		wndclass.style = CS_DBLCLKS;
		wndclass.lpfnWndProc = WndProc;
		wndclass.cbClsExtra = 0;
		wndclass.cbWndExtra = 0;
		wndclass.hInstance = hInstance;
		wndclass.hIcon = LoadIcon(hInst, "SHOWICON");
		wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
		wndclass.hbrBackground = GetStockObject(BLACK_BRUSH);
		wndclass.lpszMenuName = szAppName;
		wndclass.lpszClassName = szAppName;

		if (!RegisterClass(&wndclass))
			return FALSE;

        palclass.style = CS_DBLCLKS;
        palclass.lpfnWndProc = lpProc;
        palclass.cbClsExtra = 0;
        palclass.cbWndExtra = 0;
        palclass.hInstance = hInstance;
        palclass.hIcon = LoadIcon(hInst, "SHOWICON");
        palclass.hCursor = LoadCursor(NULL, IDC_ARROW);
        palclass.hbrBackground = GetStockObject(BLACK_BRUSH);
        palclass.lpszMenuName = szPalName;
        palclass.lpszClassName = szPalName;

        if (!RegisterClass(&palclass))
			return FALSE;
    }

	/* Save the pointer to the command line */
	lstrcpy(achFileName, lpszCmdLine);

	xScreen = GetSystemMetrics(SM_CXSCREEN);
	yScreen = GetSystemMetrics(SM_CYSCREEN);
    xFrame = GetSystemMetrics(SM_CXFRAME);
    yFrame = GetSystemMetrics(SM_CYFRAME);
    MenuHeight = GetSystemMetrics(SM_CYMENU);
    CaptionHeight = GetSystemMetrics(SM_CYCAPTION);

	/* Create the app. window */
    hWndApp = hWnd =CreateWindow(szAppName,szAppName,dwStyle,CW_USEDEFAULT,
                0,xScreen / 2,yScreen / 2,NULL,NULL,hInstance,NULL);

    ShowWindow(hWndApp , nCmdShow);

    hDebugWnd=CreateDebugWindow(hWndApp);      /* Open the debugging window */

    hPaletteWnd = CreateWindow(szPalName,szPalName,dwPalStyle,0,
                yScreen-(24+CaptionHeight+10),256+2,24+CaptionHeight+8,NULL,NULL,hInstance,NULL);

ErrMsg("Palette Window Handle:%d",(int)hPaletteWnd);
ErrMsg("szPalName=%ld",(long int)szPalName);

    ShowWindow(hPaletteWnd , SW_SHOWNORMAL);


	/* Enter message loop */
	while (GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

    FreeProcInstance(lpProc);   /* free the procedure instance for the palette */

	return msg.wParam;
}

===============================================================================

Somebody please help me, this is really driving me mad!

		Quincey Koziol
		Programmer
		NCSA

koziol@ncsa.uiuc.edu