[dev-c++] Niente bitmap ?

[DanieleC88]

Usando Dev-C++ 4, sto cercando di creare un gioco 2D stile Raptor, ma purtroppo non riesco a disegnare le bitmap. Il codice che sto usando e' solo un test, ma non capisco dove io sbagli (non vi ho incluso i file resource.rc e resource.h perche' li potreste facilmente riscrivare anche voi.)

Questo e' il mio codice:

//General including section
  #include <windows.h>
//Custom including section
  #include "resource.h"

/* Constants declarations */
#define FAIL -1

/* Types declarations */
typedef struct SCREEN {
  int width, height, bpp;
};

/* General declarations */
HINSTANCE hinst;        //instance handle
SCREEN screen;          //screen params
HWND hwnd;              //window handle
HDC  hdc;               //device context

int rc;                 //return code

/* Bitmaps declarations */
  HBITMAP hback; /* handle */
  BITMAP  sback; /* size   */

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/*  Make the class name into a global variable  */
char *szClassName = "GDI";
char *lpAppName   = "Raptor";

void GetScreenMode (SCREEN *scr)
{
  HDC sdc; //screen device context

  sdc = CreateDC ("DISPLAY", NULL, NULL, NULL);
    /* Get screen params */
    scr->width  = GetDeviceCaps (hdc, HORZRES);
    scr->height = GetDeviceCaps (hdc, VERTRES);
    scr->bpp    = GetDeviceCaps (hdc, BITSPIXEL);
  DeleteDC (sdc);
}

void ResizeWindow (HWND hwin, int w, int h)
{
  RECT wrec;
  
  GetWindowRect (hwin, &wrec);
  MoveWindow (hwnd, wrec.left, wrec.top, w, h, TRUE);
}

/* ------------------------------------------------------------------------- */
/* MAIN PROCEDURE                                                            */
/* ------------------------------------------------------------------------- */

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
  HDC bdc;                 /* Bitmap device context */
  HPEN hpen;               /* Custom color pen */

  POINT mpos;              /* Mouse position */
  MSG messages;            /* Here messages to the application are saved */
  BOOL ldFailed;           /* To check if the loading is failed */
  DEVMODE cdsdm;           /* ChangeDisplaySettings Device Mode */
  WNDCLASSEX wincl;        /* Data structure for the windowclass */

  //General assignements that don't deserve to load nothing
  ldFailed = FALSE;

  /* First of all, we must load the GDI bitmaps. */
  /* Bitmaps are the heart of a 2D game, and if  */
  /* they're not loaded, there is no reason to   */
  /* continue with creating classes or windows.  */
  
    //Setting the hinst variable
  hinst = hThisInstance;
  
    // Default is the BITMAPS directory
    // We declared bitmap files in our RESOURCE
    // ----------------------------------------
    // Background bitmap
  hback = LoadBitmap (hinst, MAKEINTRESOURCE (BMPBACKGROUND));
  if (hback == NULL || !hback) ldFailed = TRUE;
  
  if (ldFailed) {
    MessageBox (0, "Cannot load game bitmaps.\n\n"
                   "Please, make sure that the folder \"bitmaps\" "
                   "is in the main game folder and that it contains "
                   "valid 24-bit bitmaps.", lpAppName, MB_ICONERROR);
  //return FAIL;
  }

  /* The Window structure */
  wincl.hInstance = hThisInstance;
  wincl.lpszClassName = szClassName;
  wincl.lpfnWndProc = WindowProcedure; /* This function is called by Windows */
  wincl.style = CS_DBLCLKS;            /* Catch double-clicks */
  wincl.cbSize = sizeof (WNDCLASSEX);

  /* Use default icon and mouse-pointer */
  wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
  wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
  wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
  wincl.lpszMenuName = NULL;        /* No menu */
  wincl.cbClsExtra = 0;             /* No extra bytes after the window class */
  wincl.cbWndExtra = 0;             /* structure or the window instance */
  /* Use Windows's default color as the background of the window */
  wincl.hbrBackground = (HBRUSH) NULL;

  /* Register the window class, and if it fails quit the program */
  if (!RegisterClassEx (&wincl))
    return FAIL;

  /* The class is registered, let's create the window */
  hwnd = CreateWindowEx (
         0,                   /* Extended possibilites for variation */
         szClassName,         /* Classname */
         "GDI Game",          /* Title Text */
         WS_POPUPWINDOW,      /* default window */
         CW_USEDEFAULT,       /* Windows decides the position */
         CW_USEDEFAULT,       /* where the window ends up on the screen */
         0,                   /* The programs width */
         0,                   /* and height in pixels */
         HWND_DESKTOP,        /* The window is a child-window to desktop */
         NULL,                /* No menu */
         hThisInstance,       /* Program Instance handler */
         NULL                 /* No Window Creation data */
         );
  hdc = GetDC(hwnd);

  /* Get screen settings */
  GetScreenMode (&screen);
  
  /* Set screen mode */
  ZeroMemory (&cdsdm, sizeof (cdsdm));
  cdsdm.dmBitsPerPel = 24;    //color depth
  cdsdm.dmPelsWidth  = 640;   //x-resolution
  cdsdm.dmPelsHeight = 480;   //y-resolution
  cdsdm.dmFields = (DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT);
  if (!(screen.bpp >= 24) || (screen.height != 480) || (screen.width != 640)) {
    rc = ChangeDisplaySettings (&cdsdm, CDS_FULLSCREEN);
  } else
    rc = DISP_CHANGE_SUCCESSFUL;
  
  if (rc != DISP_CHANGE_SUCCESSFUL) {
    MessageBox (hwnd, "Cannot change display mode.\n\n"
                      "Maybe your color depth is too low. Try to change it to "
                      "24-bit and restart Windows if asked. After restarting "
                      "Windows, start again the game. If you see this message "
                      "again, then you'd better check up your monitor and video "
                      "card capabilities.", lpAppName, MB_ICONERROR);
  //DestroyWindow (hwnd);
  //return FAIL;
  }

  /* Refresh screen settings */
  GetScreenMode (&screen);
  /* Resize the window */
  ResizeWindow (hwnd, screen.width, screen.height);
  /* Make the window visible on the screen */
  ShowWindow (hwnd, nFunsterStil);

  hpen = CreatePen (PS_SOLID, 0x0, 0xCCCCCC);
  SelectObject (hdc, hpen);

  GetCursorPos (&mpos);
  MoveToEx (hdc, mpos.x, mpos.y, NULL);

  /* Run the message loop. It will run until GetMessage() returns 0 */
  while (GetMessage (&messages, NULL, 0, 0))
  {
      /* Translate virtual-key messages into character messages */
      TranslateMessage(&messages);
      /* Send message to WindowProcedure */
      DispatchMessage(&messages);
  
    /* The main game loop. We must do all here. */
    GetCursorPos (&mpos);
    LineTo (hdc, mpos.x, mpos.y);

    bdc = CreateCompatibleDC (hdc);             /* create a bitmap DC */
      GetObject (hback, sizeof(sback), &sback); /* get bitmap size */
      SelectObject (bdc, hback);                /* select bitmap */
      BitBlt (hdc, mpos.x, mpos.y,              /* draw bitmap */
                  (mpos.x + sback.bmWidth), (mpos.y + sback.bmHeight),
              bdc, sback.bmWidth, sback.bmHeight, SRCCOPY);
    DeleteDC (bdc);                             /* delete bitmap DC */
  }

  /* We must destroy our HGDIOBJ */
  DeleteObject (hpen);
  DeleteObject (hback);

  /* Restore screen mode */
  cdsdm.dmBitsPerPel = screen.bpp;
  cdsdm.dmPelsWidth  = screen.width;
  cdsdm.dmPelsHeight = screen.height;
  cdsdm.dmFields = (DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT);
  rc = ChangeDisplaySettings (&cdsdm, 0);

  if (rc != DISP_CHANGE_SUCCESSFUL) {
    MessageBox (hwnd, "Cannot restore display mode.\n\n"
                      "You can manually restore it by right-clicking the "
                      "desktop, selecting \"Properties\", switching to tab "
                      "\"Settings\" and changing the resolution with the "
                      "slider and the color depth with the combo box.",
                      lpAppName, MB_ICONERROR);
    return FAIL;
  }

  /* The program return-value is 0 - The value that PostQuitMessage() gave */
  return messages.wParam;
}

/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  switch (message)                  /* handle the messages */
  {
    case WM_KEYDOWN:
      int keycode;
    
      keycode = (int)wParam;
      if (keycode == VK_ESCAPE) DestroyWindow(hwnd);
      break;
    case WM_ERASEBKGND:           /* VERY COOOOL without it ! */
      HBRUSH hodb;  HPEN hopn;    // old brush    - old pen
      HBRUSH htbr;  HPEN hnwp;    // new brush    - new pen
      RECT   winr;                // window rect
    
      GetWindowRect (hwnd, &winr);
      htbr = CreateSolidBrush (0x000000); hnwp = CreatePen(PS_SOLID, 0x0, 0x0);
      hodb = (HBRUSH) SelectObject (hdc, htbr);
      hopn = (HPEN)   SelectObject (hdc, hnwp);
        Rectangle (hdc, winr.left, winr.top, winr.right, winr.bottom);
      SelectObject (hdc, hopn); SelectObject (hdc, hodb);
      DeleteObject (htbr);      DeleteObject (hnwp);
      break;
    case WM_DESTROY:
      PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
      break;
    default:                      /* for messages that we don't deal with */
      return DefWindowProc (hwnd, message, wParam, lParam);
  }

  return 0;
}

continuo a non capire dove sia l'errore.

[DanieleC88]

Dato che mi trovo, come mai ChangeDisplaySettings non funziona ? Anche qui, non vedo l'errore.

[misterx]

io ho provato a compilare il tuo sorgente e funziona

[Kleidemos]

Originariamente inviato da misterx
io ho provato a compilare il tuo sorgente e funziona

a me no

[misterx]

perchè non sei uno specialista.........



































ma nemmeno io


dunque, a me permette di disegnare su uno schermo nero e senza che vi sia la necessità di premere il pulsante sx del mouse

[Kleidemos]

Originariamente inviato da misterx
perchè non sei uno specialista.........

è vero!

[gokan]

Non conosco un gioco 2d di nome raptor, mi potete erudire?

[cionci]

L'unico Raptor che conosco è uno sparatutto a scrolling verticale di una decina di anni fa...

[DanieleC88]

cionci indovina ancora: sto cercando di fare proprio un gioco come il vecchio Raptor della Apogee. Cmq, e' normale che si veda lo schermo nero con una linea continua, era solo per testare se l'hdc era buono. Purtroppo non vedo nessuna bitmap sul mio schermo. Dovrebbe anche cambiare risoluzione ma e' sempre DISP_CHANGE_BADMODE.

[DanieleC88]

Ecco, vi mando l'intera cartella. Comunque il problema forse e' nei makefile. Come detto da misterx, "perche' non sei uno specialista". Non lo sono nemmeno io.