1 #include <Windows.h>
  2 #include <stdlib.h>
  3 #include <string.h>
  4 #include <tchar.h>
  5 
  6 // Global variables
  7 // The main window class name
  8 TCHAR szWindowClass[] = _T("Win32app");
  9 
 10 // The string that appear in the application's title bar
 11 TCHAR szTitle[] = _T("Win32");
 12 HINSTANCE hInst;
 13 
 14 // Forward declaration of function
 15 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
 16 
 17 
 18 int WINAPI WinMain(HINSTANCE hInstance,
 19                 HINSTANCE hPrevInstace,
 20                 LPSTR lpCmdLine,
 21                 int nCmdShow)
 22 {
 23     WNDCLASSEX wcex;
 24 
 25     wcex.cbSize = sizeof(WNDCLASSEX);
 26     wcex.style = CS_HREDRAW | CS_VREDRAW;
 27     wcex.lpfnWndProc = WndProc;
 28     wcex.cbClsExtra = 0;
 29     wcex.cbWndExtra = 0;
 30     wcex.hInstance = hInstance;
 31     wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
 32     wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
 33     wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
 34     wcex.lpszMenuName = NULL;
 35     wcex.lpszClassName = szWindowClass;
 36     wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
 37 
 38     if (!RegisterClassEx(&wcex))
 39     {
 40         MessageBox(NULL,
 41             _T("Call to RegisterClassEx failed!"),
 42             _T("Win32 Guided Tour"),
 43             NULL);
 44         
 45         return 1;
 46     }
 47 
 48     hInst = hInstance;            // Store instance handle in our global variable.
 49 
 50 
 51     HWND hWnd = CreateWindow(
 52         szWindowClass,
 53         szTitle,
 54         WS_OVERLAPPEDWINDOW,
 55         CW_USEDEFAULT, CW_USEDEFAULT,
 56         500, 100,
 57         NULL,
 58         NULL,
 59         hInstance,
 60         NULL);
 61 
 62     if (!hWnd)
 63     {
 64         MessageBox(NULL,
 65             _T("Call to CreateWindow failed!"),
 66             _T("Win32 Guided Tour"),
 67             NULL);
 68 
 69         return 1;
 70     }
 71 
 72     ShowWindow(hWnd, nCmdShow);
 73     UpdateWindow(hWnd);
 74 
 75     MSG msg;
 76 
 77     while (GetMessage(&msg, NULL, 0, 0))
 78     {
 79         TranslateMessage(&msg);
 80         DispatchMessage(&msg);
 81     }
 82 
 83     return (int)msg.wParam;
 84 }
 85 
 86 
 87 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 88 {
 89     switch (message)
 90     {
 91 
 92     case WM_PAINT:
 93     {
 94         PAINTSTRUCT ps;
 95         BeginPaint(hWnd, &ps);
 96 
 97         RECT rc;
 98         GetClientRect(
 99             hWnd,
100             &rc
101             );
102 
103 
104         HGDIOBJ original = NULL;
105         original = SelectObject(
106             ps.hdc,
107             GetStockObject(DC_PEN)
108             );
109             
110         HPEN blackPen = CreatePen(PS_SOLID, 3, 0);
111 
112 
113         SelectObject(ps.hdc, blackPen);
114 
115         Rectangle(
116             ps.hdc,
117             rc.left + 100,
118             rc.top + 100,
119             rc.right - 100,
120             rc.bottom - 100);
121 
122         DeleteObject(blackPen);
123 
124         
125         SelectObject(ps.hdc, original);
126 
127         EndPaint(hWnd, &ps);
128     }
129         return 0;
130     }
131 
132 }