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Screensaver not configuring properly The problem: Whenever I compile and run the screensaver, and open the configure dialog, and try to move the scrollbar, the scrollbar does not move. What is wrong??
I know this is a lot of code, but I think the problem lies in the WM_HSCROLL message or in the ID_OK message.
Code://main.c #define MINVEL 1 // minimum redraw speed value #define MAXVEL 10 // maximum redraw speed value #define DEFVEL 5 // default redraw speed value #include <stdio.h> #include "resource.h" LONG lSpeed = DEFVEL; // redraw speed variable extern HINSTANCE hMainInstance; // screen saver instance handle CHAR szAppName[80]; // .ini section name CHAR szTemp[20]; // temporary array of characters CHAR szRedrawSpeed[ ] = "Redraw Speed"; // .ini speed entry CHAR szIniFile[MAXFILELEN]; // .ini or registry file name UINT i=0; BOOL WINAPI ScreenSaverConfigureDialog(hDlg, message, wParam, lParam) HWND hDlg; UINT message; WPARAM wParam; LPARAM lParam; { static HWND hSpeed; // handle to speed scroll bar static HWND hOK; // handle to OK push button switch(message) { case WM_INITDIALOG: // Retrieve the application name from the .rc file. LoadString(hMainInstance, idsAppName, szAppName, 80 * sizeof(TCHAR)); // Retrieve the .ini (or registry) file name. LoadString(hMainInstance, idsIniFile, szIniFile, MAXFILELEN * sizeof(TCHAR)); // TODO: Add error checking to verify LoadString success // for both calls. // 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 to 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. //hr = StringCchPrintf(szTemp, 20, "%ld", lSpeed); wsprintf(szTemp, "%ld", lSpeed); //if (SUCCEEDED(hr)) WritePrivateProfileString(szAppName, szRedrawSpeed, szTemp, szIniFile); case ID_CANCEL: EndDialog(hDlg, LOWORD(wParam) == ID_OK); return TRUE; } } return FALSE; } BOOL WINAPI RegisterDialogClasses(hInst) HANDLE hInst; { return TRUE; } LONG WINAPI ScreenSaverProc(hwnd, message, wParam, lParam) HWND hwnd; UINT message; WPARAM wParam; LPARAM lParam; { static HDC hdc; // device-context handle static RECT rc; // RECT structure static UINT uTimer; // timer identifier switch(message) { case WM_CREATE: // Retrieve the application name from the .rc file. LoadString(hMainInstance, idsAppName, szAppName, 80 * sizeof(TCHAR)); // Retrieve the .ini (or registry) file name. LoadString(hMainInstance, idsIniFile, szIniFile, MAXFILELEN * sizeof(TCHAR)); // TODO: Add error checking to verify LoadString success // for both calls. // 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(BLACK_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)); 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); }Code://resource.h #include <windows.h> #include <wingdi.h> #include <scrnsave.h> #ifndef ID_SPEED #define ID_SPEED 200453 #endif #ifndef ID_OK #define ID_OK IDOK #endif #ifndef ID_CANCEL #define ID_CANCEL IDCANCEL #endifCode://resource.rc #include "resource.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 Shell Dlg" 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 LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL 1 RT_MANIFEST "manifest.xml"Code://manifest.xml <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"> <dependency> <dependentAssembly> <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/> </dependentAssembly> </dependency> <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3"> <security> <requestedPrivileges> <requestedExecutionLevel level="asInvoker" uiAccess="false"/> </requestedPrivileges> </security> </trustInfo> </assembly>
