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C/C++ Source or Header  |  1988-08-11  |  4.1 KB  |  142 lines
  1. /*
  2.  *   GetDlgItem
  3.  *
  4.  *   This program demonstrates the use of the GetDlgItem function.
  5.  *
  6.  */
  7.  
  8. #include <windows.h>
  9. #include <stdio.h>
  10. #include "gdlgitm.h"
  11.  
  12. long FAR PASCAL DlgItmWndProc(HWND, unsigned, WORD, LONG);
  13.  
  14. HANDLE  hInst;        /* Instance handle for dialog box. */
  15. FARPROC lpprocDialog; /* Pointer to dialog procedure.    */
  16.  
  17. BOOL FAR PASCAL DialogBoxProc(hDlg, message, wParam, lParam)
  18. HWND     hDlg;
  19. unsigned message;
  20. WORD     wParam;
  21. LONG     lParam;
  22. { 
  23.   switch (message)
  24.     {
  25.     case WM_INITDIALOG:
  26.       SetFocus(GetDlgItem(hDlg, EDIT_CONTROL));
  27.       return FALSE;
  28.  
  29.     case WM_COMMAND:
  30.       if (wParam == ID_OK)
  31.         { 
  32.         char szBuff[80]; /* Output buffer from the edit control. */
  33.         HWND hCtl;       /* Handle to the edit control, Used by  */
  34.                          /* GetDlgItem().                        */
  35.  
  36.         /* Get the handle to the edit control window. */
  37.         MessageBox(GetFocus(),
  38.                    (LPSTR)"Getting handle to control in dialog box",
  39.                    (LPSTR)"GetDlgItem", MB_OK);
  40.         hCtl = GetDlgItem(hDlg, EDIT_CONTROL);
  41.         if (hCtl == NULL)
  42.           MessageBox(GetFocus(), (LPSTR)"Error In Obatining Handle!",
  43.                      (LPSTR)"GetDlgItem() Error!",
  44.                      MB_OK | MB_ICONEXCLAMATION);
  45.         else
  46.           /* If the handle is good, get and show the edit control text. */
  47.           SendMessage(hCtl, WM_GETTEXT, (WORD)80, (LONG)szBuff);
  48.           MessageBox(GetFocus(), (LPSTR)szBuff,
  49.                      (LPSTR)"Edit Box Contents using GetDlgItem()",
  50.                      MB_OK);
  51.         /* And Quit. */
  52.         EndDialog(hDlg,TRUE);
  53.         return TRUE;
  54.         }
  55.       else return FALSE;
  56.  
  57.     default:
  58.       return FALSE;
  59.    } 
  60. }
  61.  
  62. int PASCAL WinMain(hInstance, hPrevInstance, lpszCmdLine, cmdShow)
  63. HANDLE hInstance, hPrevInstance;
  64. LPSTR  lpszCmdLine;
  65. int    cmdShow;
  66. {
  67.   MSG       msg;          /* Window messages.           */
  68.   HWND      hWnd;         /* Window handle.             */
  69.   PWNDCLASS pDlgItmClass; /* Pointer to the class data. */
  70.  
  71.   pDlgItmClass = (PWNDCLASS)LocalAlloc(LPTR, sizeof(WNDCLASS));
  72.  
  73.   pDlgItmClass->hCursor       = LoadCursor(NULL, IDC_ARROW);
  74.   pDlgItmClass->hIcon         = LoadIcon(hInstance, NULL);
  75.   pDlgItmClass->lpszMenuName  = (LPSTR)"dlgmenu";
  76.   pDlgItmClass->lpszClassName = (LPSTR)"gdlgitm";
  77.   pDlgItmClass->hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
  78.   pDlgItmClass->hInstance     = hInstance;
  79.   pDlgItmClass->style         = CS_HREDRAW | CS_VREDRAW;
  80.   pDlgItmClass->lpfnWndProc   = DlgItmWndProc;
  81.  
  82.   if (!RegisterClass((LPWNDCLASS)pDlgItmClass))
  83.     return FALSE;
  84.  
  85.   LocalFree((HANDLE)pDlgItmClass);
  86.  
  87.   hWnd = CreateWindow((LPSTR)"gdlgitm", (LPSTR)"GetDlgItem",
  88.                       WS_OVERLAPPEDWINDOW,
  89.                       CW_USEDEFAULT, CW_USEDEFAULT,
  90.                       CW_USEDEFAULT,  CW_USEDEFAULT,
  91.                       (HWND)NULL, (HMENU)NULL, (HANDLE)hInstance,
  92.                       (LPSTR)NULL);
  93.   hInst = hInstance;
  94.  
  95.   ShowWindow(hWnd, cmdShow);
  96.   UpdateWindow(hWnd);
  97.  
  98.   while (GetMessage((LPMSG)&msg, NULL, 0, 0))
  99.     {
  100.     TranslateMessage((LPMSG)&msg);
  101.     DispatchMessage((LPMSG)&msg);
  102.     }
  103.  
  104.   return (int)msg.wParam;
  105. }
  106.  
  107. /* Procedures which make up the window class. */
  108. long FAR PASCAL DlgItmWndProc(hWnd, message, wParam, lParam)
  109. HWND     hWnd;
  110. unsigned message;
  111. WORD     wParam;
  112. LONG     lParam;
  113. {
  114.   switch (message)
  115.     {
  116.     case WM_COMMAND:
  117.       switch (wParam)
  118.         {
  119.         case ID_DLGMENU:
  120.           /* Show the demo dialog box. */
  121.           lpprocDialog = MakeProcInstance((FARPROC)DialogBoxProc, hInst);
  122.           DialogBox(hInst, MAKEINTRESOURCE(ITEMBOX), hWnd, lpprocDialog);
  123.           FreeProcInstance((FARPROC)lpprocDialog);
  124.           break;
  125.  
  126.         default:
  127.           return DefWindowProc(hWnd, message, wParam, lParam);
  128.           break;
  129.         }
  130.       break;
  131.  
  132.     case WM_DESTROY:
  133.       PostQuitMessage(0);
  134.       break;
  135.  
  136.     default:
  137.       return DefWindowProc(hWnd, message, wParam, lParam);
  138.       break;
  139.     }
  140.   return(0L);
  141. }
  142.