c 2b 2b window code

1// HelloWindowsDesktop.cpp
2// compile with: /D_UNICODE /DUNICODE /DWIN32 /D_WINDOWS /c
3
4#include <windows.h>
5#include <stdlib.h>
6#include <string.h>
7#include <tchar.h>
8
9// Global variables
10
11// The main window class name.
12static TCHAR szWindowClass[] = _T("DesktopApp");
13
14// The string that appears in the application's title bar.
15static TCHAR szTitle[] = _T("Windows Desktop Guided Tour Application");
16
17HINSTANCE hInst;
18
19// Forward declarations of functions included in this code module:
20LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
21
22int CALLBACK WinMain(
23   _In_ HINSTANCE hInstance,
24   _In_opt_ HINSTANCE hPrevInstance,
25   _In_ LPSTR     lpCmdLine,
26   _In_ int       nCmdShow
27)
28{
29   WNDCLASSEX wcex;
30
31   wcex.cbSize = sizeof(WNDCLASSEX);
32   wcex.style          = CS_HREDRAW | CS_VREDRAW;
33   wcex.lpfnWndProc    = WndProc;
34   wcex.cbClsExtra     = 0;
35   wcex.cbWndExtra     = 0;
36   wcex.hInstance      = hInstance;
37   wcex.hIcon          = LoadIcon(hInstance, IDI_APPLICATION);
38   wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
39   wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
40   wcex.lpszMenuName   = NULL;
41   wcex.lpszClassName  = szWindowClass;
42   wcex.hIconSm        = LoadIcon(wcex.hInstance, IDI_APPLICATION);
43
44   if (!RegisterClassEx(&wcex))
45   {
46      MessageBox(NULL,
47         _T("Call to RegisterClassEx failed!"),
48         _T("Windows Desktop Guided Tour"),
49         NULL);
50
51      return 1;
52   }
53
54   // Store instance handle in our global variable
55   hInst = hInstance;
56
57   // The parameters to CreateWindow explained:
58   // szWindowClass: the name of the application
59   // szTitle: the text that appears in the title bar
60   // WS_OVERLAPPEDWINDOW: the type of window to create
61   // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
62   // 500, 100: initial size (width, length)
63   // NULL: the parent of this window
64   // NULL: this application does not have a menu bar
65   // hInstance: the first parameter from WinMain
66   // NULL: not used in this application
67   HWND hWnd = CreateWindow(
68      szWindowClass,
69      szTitle,
70      WS_OVERLAPPEDWINDOW,
71      CW_USEDEFAULT, CW_USEDEFAULT,
72      500, 100,
73      NULL,
74      NULL,
75      hInstance,
76      NULL
77   );
78
79   if (!hWnd)
80   {
81      MessageBox(NULL,
82         _T("Call to CreateWindow failed!"),
83         _T("Windows Desktop Guided Tour"),
84         NULL);
85
86      return 1;
87   }
88
89   // The parameters to ShowWindow explained:
90   // hWnd: the value returned from CreateWindow
91   // nCmdShow: the fourth parameter from WinMain
92   ShowWindow(hWnd,
93      nCmdShow);
94   UpdateWindow(hWnd);
95
96   // Main message loop:
97   MSG msg;
98   while (GetMessage(&msg, NULL, 0, 0))
99   {
100      TranslateMessage(&msg);
101      DispatchMessage(&msg);
102   }
103
104   return (int) msg.wParam;
105}
106
107//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
108//
109//  PURPOSE:  Processes messages for the main window.
110//
111//  WM_PAINT    - Paint the main window
112//  WM_DESTROY  - post a quit message and return
113LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
114{
115   PAINTSTRUCT ps;
116   HDC hdc;
117   TCHAR greeting[] = _T("Hello, Windows desktop!");
118
119   switch (message)
120   {
121   case WM_PAINT:
122      hdc = BeginPaint(hWnd, &ps);
123
124      // Here your application is laid out.
125      // For this introduction, we just print out "Hello, Windows desktop!"
126      // in the top left corner.
127      TextOut(hdc,
128         5, 5,
129         greeting, _tcslen(greeting));
130      // End application-specific layout section.
131
132      EndPaint(hWnd, &ps);
133      break;
134   case WM_DESTROY:
135      PostQuitMessage(0);
136      break;
137   default:
138      return DefWindowProc(hWnd, message, wParam, lParam);
139      break;
140   }
141
142   return 0;
143}
144