Screen Saver Problems

I'm new to windows programming.

I used the example screen saver code with the SDK.  The screen saver worked when I would preview it, but when I hit the settings button nothing would happen.  I defined the following three funtions and linked with the scrnsave.lib.  I also passed any unprocessed messages to
DefScreenSaverProc(hwnd, message, wParam, lParam).

BOOL WINAPI ScreenSaverConfigureDialog(HWND hDlg, UINT message, WPARAM
wParam, LONG lParam)

BOOL WINAPI RegisterDialogClasses(HANDLE hInst)

LONG WINAPI ScreenSaverProc(HWND hwnd, UINT message, WPARAM wParam, LONG
lParam)

Can anyone answer these questions or have other source code that I could look at that does not use MFC?


/*-----------------------------------------------------------------------

      sstest.c

      Dale Lepine
      7/14/97
      Screen Saver Program

-----------------------------------------------------------------------*/

#include <windows.h>
#include <scrnsave.h>
#include "sstest.h"

#define  DLG_SCRNSAVECONFIGURE 2003
 
 
//The following example shows the ScreenSaverConfigureDialog function found in the sample application.
 
#define MINVEL  1               /* minimum redraw-speed value    */
#define MAXVEL  10              /* maximum redraw-speed value    */
#define DEFVEL  1               /* default redraw-speed value    */
 
LONG    lSpeed = DEFVEL;        /* redraw-speed variable         */
 
extern HINSTANCE hMainInstance; /* screen saver instance handle  */
 
CHAR   szTemp[20];              /* temporary array of characters */
CHAR   szRedrawSpeed[] = "Redraw Speed";   /* .INI speed entry   */


BOOL WINAPI ScreenSaverConfigureDialog(HWND hDlg, UINT message, WPARAM wParam, LONG lParam)
{
    static HWND hSpeed; /* handle of speed scroll bar */
    static HWND hOK;    /* handle of OK push button */
 
    switch(message)
    {
        case WM_INITDIALOG:
 
            /* Retrieve the application name from the .RC file. */
 
            LoadString(hMainInstance, idsAppName, szAppName, 40);
 
            /* Retrieve the .INI (or registry) filename. */
 
            LoadString(hMainInstance, idsIniFile, szIniFile,
                MAXFILELEN);
 
            /* Retrieve any redraw-speed data from the registry. */
 
            lSpeed = GetPrivateProfileInt(szAppName, szRedrawSpeed,
                DEFVEL, szIniFile);
 
            /*
             * If the initialization file does not contain an entry
             * for this screen saver, use the default value.
             */
 
            if(lSpeed > MAXVEL || lSpeed < MINVEL)
                lSpeed = DEFVEL;
 
            /* Initialize the redraw-speed scroll bar control. */
 
            hSpeed = GetDlgItem(hDlg, ID_SPEED);
            SetScrollRange(hSpeed, SB_CTL, MINVEL, MAXVEL, FALSE);
            SetScrollPos(hSpeed, SB_CTL, lSpeed, TRUE);
 
            /* Retrieve a handle of the OK push button control. */
 
            hOK = GetDlgItem(hDlg, ID_OK);
 
            return TRUE;
 
        case WM_HSCROLL:
 
            /*
             * Process scroll bar input, adjusting the lSpeed
             * value as appropriate.
             */
 
            switch (LOWORD(wParam))
                {
                    case SB_PAGEUP:
                        --lSpeed;
                    break;
 
                    case SB_LINEUP:
                        --lSpeed;
                    break;
 
                    case SB_PAGEDOWN:
                        ++lSpeed;
                    break;
 
                    case SB_LINEDOWN:
                        ++lSpeed;
                    break;
 
                    case SB_THUMBPOSITION:
                        lSpeed = HIWORD(wParam);
                    break;
 
                    case SB_BOTTOM:
                        lSpeed = MINVEL;
                    break;
 
                    case SB_TOP:
                        lSpeed = MAXVEL;
                    break;
 
                    case SB_THUMBTRACK:
                    case SB_ENDSCROLL:
                        return TRUE;
                    break;
                }
                if ((int) lSpeed <= MINVEL)
                    lSpeed = MINVEL;
                if ((int) lSpeed >= MAXVEL)
                    lSpeed = MAXVEL;
 
                SetScrollPos((HWND) lParam, SB_CTL, lSpeed, TRUE);
            break;
 
        case WM_COMMAND:
            switch(LOWORD(wParam))
            {
                case ID_OK:
 
                   /*
                    * Write the current redraw-speed variable to
                    * the .INI file.
                    */
 
                    wsprintf(szTemp, "%ld", lSpeed);
                    WritePrivateProfileString(szAppName, szRedrawSpeed,
                        szTemp, szIniFile);
 
                case ID_CANCEL:
                    EndDialog(hDlg, LOWORD(wParam) == ID_OK);
                return TRUE;
            }
    }
    return FALSE;
}



BOOL WINAPI RegisterDialogClasses(HANDLE hInst)
{

      return TRUE;

}



LONG WINAPI ScreenSaverProc(HWND hwnd, UINT message, WPARAM wParam, LONG lParam)
{
static HDC          hdc;    /* device-context handle */
static RECT         rc;     /* RECT structure */
static UINT         uTimer; /* timer identifier */
static int i = 0;
 
    switch(message)
    {
        case WM_CREATE:
 
            /* Retrieve the application name from the .RC file. */
 
            LoadString(hMainInstance, idsAppName, szAppName, 40);
 
            /* Retrieve the .INI (or registry) filename. */
 
            LoadString(hMainInstance, idsIniFile, szIniFile,
                MAXFILELEN);
 
            /* Retrieve any redraw-speed data from the registry. */
 
            lSpeed = GetPrivateProfileInt(szAppName, szRedrawSpeed,
                DEFVEL, szIniFile);
 
           /*
            * Set a timer for the screen saver window using the
            * redraw-rate stored in REGEDIT.INI.
            */
 
            uTimer = SetTimer(hwnd, 1, lSpeed * 1000, NULL);
            break;
 
        case WM_ERASEBKGND:
 
           /*
            * The WM_ERASEBKGND message is issued before the
            * WM_TIMER message, allowing the screen saver to
            * paint the background as appropriate.
            */
 
            hdc = GetDC(hwnd);
            GetClientRect (hwnd, &rc);
                  FillRect (hdc, &rc, GetStockObject(WHITE_BRUSH));
            ReleaseDC(hwnd,hdc);
            break;
 
        case WM_TIMER:
 
           /*
            * The WM_TIMER message is issued at (lSpeed * 1000)
            * intervals, where lSpeed == .001 seconds. This
            * code repaints the entire desktop with a white,
            * light gray, dark gray, or black brush each
            * time a WM_TIMER message is issued.
            */
 
            hdc = GetDC(hwnd);
            GetClientRect(hwnd, &rc);
            if (i++ <= 4)
            {
                        FillRect(hdc, &rc, GetStockObject(i));
                        DrawText(hdc, "Hello, Windows95!", -1, &rc, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
                  }
                  else
                (i = 0);
            ReleaseDC(hwnd,hdc);
            break;
 
        case WM_DESTROY:
 
           /*
            * When the WM_DESTROY message is issued, the screen saver
            * must destroy any of the timers that were set at WM_CREATE
            * time.
            */
 
            if (uTimer)
                KillTimer(hwnd, uTimer);
            break;
    }
 
   /*
    * DefScreenSaverProc processes any messages
    * ignored by ScreenSaverProc.
    */
 
    return DefScreenSaverProc(hwnd, message, wParam, lParam);
}

sstest.rc

#include <winnt.h>
#include <winuser.h>
#include "sstest.h"


DLG_SCRNSAVECONFIGURE DIALOG 6, 18, 160, 63
LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
STYLE DS_MODALFRAME | WS_POPUP | WS_VISIBLE | WS_CAPTION |
    WS_SYSMENU
CAPTION "Sample Screen-Saver Setup"
FONT 8, "MS Sans Serif"
BEGIN
    GROUPBOX      "Redraw Speed", 101, 0, 6, 98, 40
    SCROLLBAR     ID_SPEED, 5, 31, 89, 10
    LTEXT         "Fast", 103, 6, 21, 20, 8
    LTEXT         "Slow", 104, 75, 21, 20, 8
    PUSHBUTTON    "OK", ID_OK, 117, 10, 40, 14
    PUSHBUTTON    "Cancel", ID_CANCEL, 117, 32, 40, 14
END

sstest.h:

#define ID_SPEED 109
#define ID_OK       108
#define ID_CANCEL 107

sstest.def:

DESCRIPTION 'SCRNSAVE : Test'
 
 
CODE    MOVEABLE
DATA    MOVEABLE MULTIPLE
 
HEAPSIZE  1024
STACKSIZE 4096
 
EXPORTS
        ScreenSaverConfigureDialog
        ScreenSaverProc

Dale Lepine
UNH
del@hopper.unh.edu