MCdemo: C/C++ Version

The C/C++ version of MCdemo activates the new cursor by passing its handle to fg_mousecur() in the WM_SETCURSOR message handler (Windows issues a WM_SETCURSOR message when the cursor moves into a window). If the message was generated as a result of the cursor moving into the window's client area, WM_SETCURSOR activates our new mouse cursor. The WM_DESTROY handler calls DestroyCursor() to free the mouse cursor handle before the program exits.

/****************************************************************************\
*                                                                            *
*  MCdemo.c                                                                  *
*                                                                            *
*  This program shows how to change the shape of the mouse cursor.           *
*                                                                            *
\****************************************************************************/
#include <fgwin.h>
#define vbWidth  320
#define vbHeight 240
LRESULT CALLBACK WindowProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdParam, int iCmdShow)
{
   static char szAppName[] = "FGmcdemo";
   HWND        hWnd;
   MSG         msg;
   WNDCLASSEX  wndclass;
   wndclass.cbSize        = sizeof(wndclass);
   wndclass.style         = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
   wndclass.lpfnWndProc   = WindowProc;
   wndclass.cbClsExtra    = 0;
   wndclass.cbWndExtra    = 0;
   wndclass.hInstance     = hInstance;
   wndclass.hIcon         = LoadIcon(NULL,IDI_APPLICATION);
   wndclass.hCursor       = LoadCursor (NULL,IDC_ARROW);
   wndclass.hbrBackground = NULL;
   wndclass.lpszMenuName  = NULL;
   wndclass.lpszClassName = szAppName;
   wndclass.hIconSm       = LoadIcon(NULL,IDI_APPLICATION);
   RegisterClassEx(&wndclass);
   hWnd = CreateWindow(szAppName, // window class name
      "Mouse Cursor Demo",     // window caption
      WS_OVERLAPPEDWINDOW,     // window style
      CW_USEDEFAULT,           // initial x position
      CW_USEDEFAULT,           // initial y position
      CW_USEDEFAULT,           // initial x size
      CW_USEDEFAULT,           // initial y size
      NULL,                    // parent window handle
      NULL,                    // window menu handle
      hInstance,               // program instance handle
      NULL);                   // creation parameters
   ShowWindow(hWnd,iCmdShow);
   UpdateWindow(hWnd);
   while (GetMessage(&msg,NULL,0,0))
   {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }
   return msg.wParam;
}
/****************************************************************************\
*                                                                            *
*  WindowProc()                                                              *
*                                                                            *
\****************************************************************************/
WORD Cross[] = {
   0xE03F,0xE03F,0xE03F,0x0007,0x0007,0x0007,0x0007,0x0007,
   0x0007,0x0007,0xE03F,0xE03F,0xE03F,0xFFFF,0xFFFF,0xFFFF,
   0x0000,0x0F80,0x0F80,0x0F80,0x7FF0,0x7FF0,0x7FF0,0x7FF0,
   0x7FF0,0x0F80,0x0F80,0x0F80,0x0000,0x0000,0x0000,0x0000};
HCURSOR  hCursor;
HDC      hDC;
HPALETTE hPal;
int      hVB;
UINT     cxClient, cyClient;
LRESULT CALLBACK WindowProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
   PAINTSTRUCT ps;
   switch (iMsg)
   {
      case WM_CREATE:
         hDC = GetDC(hWnd);
         fg_setdc(hDC);
         hPal = fg_defpal();
         fg_realize(hPal);
         fg_vbinit();
         hVB = fg_vballoc(vbWidth,vbHeight);
         fg_vbopen(hVB);
         fg_vbcolors();
         fg_setcolor(20);
         fg_fillpage();
         fg_mouseini();
         hCursor = fg_mouseptr(Cross,6,6);
         return 0;
      case WM_PAINT:
         BeginPaint(hWnd,&ps);
         fg_vbscale(0,vbWidth-1,0,vbHeight-1,0,cxClient-1,0,cyClient-1);
         EndPaint(hWnd,&ps);
         return 0;
      case WM_SETCURSOR:
         if (LOWORD(lParam) == HTCLIENT)
         {
            fg_mousecur(hCursor);
            return 0;
         }
         break;
      case WM_SETFOCUS:
         fg_realize(hPal);
         InvalidateRect(hWnd,NULL,TRUE);
         return 0;
      case WM_SIZE:
         cxClient = LOWORD(lParam);
         cyClient = HIWORD(lParam);
         return 0;
      case WM_DESTROY:
         fg_vbclose();
         fg_vbfree(hVB);
         fg_vbfin();
         DestroyCursor(hCursor);
         DeleteObject(hPal);
         ReleaseDC(hWnd,hDC);
         PostQuitMessage(0);
         return 0;
   }
   return DefWindowProc(hWnd,iMsg,wParam,lParam);
}