1 //Include necessary Headers// 2 #include <windows.h> 3 4 //Define variables/constants// 5 LPCTSTR WndClassName = L"firstwindow"; //Define our window class name 6 HWND hwnd = NULL; //Sets our windows handle to NULL 7 8 const int Width = 800; //window width 9 const int Height = 600; //window height 10 11 //Functions// 12 bool InitializeWindow(HINSTANCE hInstance, //Initialize our window 13 int ShowWnd, 14 int width, int height, 15 bool windowed); 16 17 int messageloop(); //Main part of the program 18 19 LRESULT CALLBACK WndProc(HWND hWnd, //Windows callback procedure 20 UINT msg, 21 WPARAM wParam, 22 LPARAM lParam); 23 24 int WINAPI WinMain(HINSTANCE hInstance, //Main windows function 25 HINSTANCE hPrevInstance, 26 LPSTR lpCmdLine, 27 int nShowCmd) 28 { 29 //Initialize Window// 30 if(!InitializeWindow(hInstance, nShowCmd, Width, Height, true)) 31 { 32 //If initialization failed, display an error message 33 MessageBoxW(0, L"Window Initialization - Failed", 34 L"Error", MB_OK); 35 return 0; 36 } 37 38 messageloop(); //Jump into the heart of our program 39 40 return 0; 41 } 42 43 bool InitializeWindow(HINSTANCE hInstance, //Initialize our window 44 int ShowWnd, 45 int width, int height, 46 bool windowed) 47 { 48 //Start creating the window// 49 50 WNDCLASSEX wc; //Create a new extended windows class 51 52 wc.cbSize = sizeof(WNDCLASSEX); //Size of our windows class 53 wc.style = CS_HREDRAW | CS_VREDRAW; //class styles 54 wc.lpfnWndProc = WndProc; //Default windows procedure function 55 wc.cbClsExtra = NULL; //Extra bytes after our wc structure 56 wc.cbWndExtra = NULL; //Extra bytes after our windows instance 57 wc.hInstance = hInstance; //Instance to current application 58 wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); //Title bar Icon 59 wc.hCursor = LoadCursor(NULL, IDC_ARROW); //Default mouse Icon 60 wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 2); //Window bg color 61 wc.lpszMenuName = NULL; //Name of the menu attached to our window 62 wc.lpszClassName = WndClassName; //Name of our windows class 63 wc.hIconSm = LoadIcon(NULL, IDI_WINLOGO); //Icon in your taskbar 64 65 if (!RegisterClassEx(&wc)) //Register our windows class 66 { 67 //if registration failed, display error 68 MessageBoxW(NULL, L"Error registering class", 69 L"Error", MB_OK | MB_ICONERROR); 70 return 1; 71 } 72 73 hwnd = CreateWindowExW( //Create our Extended Window 74 NULL, //Extended style 75 WndClassName, //Name of our windows class 76 L"Window Title ----Hello", //Name in the title bar of our window 77 WS_OVERLAPPEDWINDOW, //style of our window 78 CW_USEDEFAULT, CW_USEDEFAULT, //Top left corner of window 79 width, //Width of our window 80 height, //Height of our window 81 NULL, //Handle to parent window 82 NULL, //Handle to a Menu 83 hInstance, //Specifies instance of current program 84 NULL //used for an MDI client window 85 ); 86 87 if (!hwnd) //Make sure our window has been created 88 { 89 //If not, display error 90 MessageBoxW(NULL, L"Error creating window", 91 L"Error", MB_OK | MB_ICONERROR); 92 return 1; 93 } 94 95 ShowWindow(hwnd, ShowWnd); //Shows our window 96 UpdateWindow(hwnd); //Its good to update our window 97 98 return true; //if there were no errors, return true 99 } 100 101 int messageloop(){ //The message loop 102 103 MSG msg; //Create a new message structure 104 ZeroMemory(&msg, sizeof(MSG)); //clear message structure to NULL 105 106 while(true) //while there is a message 107 { 108 //if there was a windows message 109 if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) 110 { 111 if (msg.message == WM_QUIT) //if the message was WM_QUIT 112 break; //Exit the message loop 113 114 TranslateMessage(&msg); //Translate the message 115 116 //Send the message to default windows procedure 117 DispatchMessage(&msg); 118 } 119 else 120 { //Otherewise, keep the flow going 121 122 } 123 124 125 } 126 127 return (int)msg.wParam; //return the message 128 129 } 130 131 LRESULT CALLBACK WndProc(HWND hwnd, //Default windows procedure 132 UINT msg, 133 WPARAM wParam, 134 LPARAM lParam) 135 { 136 switch( msg ) //Check message 137 { 138 139 case WM_KEYDOWN: //For a key down 140 //if escape key was pressed, display popup box 141 if( wParam == VK_ESCAPE ){ 142 if(MessageBoxW(0, L"Are you sure you want to exit?", 143 L"Really?", MB_YESNO | MB_ICONQUESTION) == IDYES) 144 145 //Release the windows allocated memory 146 DestroyWindow(hwnd); 147 } 148 return 0; 149 150 case WM_DESTROY: //if x button in top right was pressed 151 PostQuitMessage(0); 152 return 0; 153 } 154 //return the message for windows to handle it 155 return DefWindowProc(hwnd, 156 msg, 157 wParam, 158 lParam); 159 }
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