#include <windows.h> #include <time.h> //V-6 LPCSTR registration_error_message = "Couldn't initialize class!"; LPCSTR registration_error_title = "Error: initializing"; LPCSTR creating_window_error_title = "Error: creating"; LPCSTR creating_window_error_message = "Couldn't create window!"; LPCSTR button_show_text = "Show"; LPCSTR button_clear_text = "Clear"; LPCSTR button_about_text = "About"; LPCSTR main_window_name = "Hello App"; LPCSTR main_window_class = "hello_class"; LPCSTR about_text = "Sergey Rakhmanov (IU3-21B)"; LRESULT CALLBACK window_callback(HWND, UINT, WPARAM, LPARAM); HINSTANCE hInst; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { HWND main_window; MSG msg; WNDCLASSEX wc; wc.cbSize = sizeof(wc); wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = window_callback; wc.lpszMenuName = NULL; wc.lpszClassName = main_window_class; wc.cbWndExtra = 0; wc.cbClsExtra = 0; wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wc.hInstance = hInstance; if(!RegisterClassEx(&wc)){ MessageBox(NULL, registration_error_message, registration_error_title, MB_OK); return NULL; } main_window = CreateWindow(main_window_class, main_window_name, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); if(!main_window){

MessageBox(NULL, creating_window_error_message, creating_window_error_title, MB_OK); return NULL; } ShowWindow(main_window, iCmdShow); UpdateWindow(main_window); while(GetMessage(&msg, NULL, 0, 0)){ TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam ; } #define BTN_WIDTH 150 #define BTN_HEIGHT 20 LRESULT CALLBACK window_callback(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam){ HDC hdc; PAINTSTRUCT ps; RECT rect; HWND button_show, button_clear, button_author; int loword; static int choise = 0; static HPEN hpen; static HBRUSH hbrush; switch (iMsg) { case WM_CREATE : button_show = CreateWindow ("button", button_show_text, WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 100, 50, BTN_WIDTH, BTN_HEIGHT, hwnd, (HMENU) 1, hInst, NULL); button_clear = CreateWindow ("button", button_clear_text, WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 100, 100, BTN_WIDTH, BTN_HEIGHT, hwnd, (HMENU) 2, hInst, NULL); button_author = CreateWindow ("button", button_about_text, WS_CHILD | WS_VISIBLE |BS_PUSHBUTTON, 100, 250, BTN_WIDTH, BTN_HEIGHT, hwnd, (HMENU) 3, hInst, NULL); return 0; case WM_COMMAND : hpen = CreatePen(PS_SOLID, 10,RGB(204, 51, 0)); hbrush = CreateSolidBrush(RGB(204, 51, 0)); loword=LOWORD(wParam); switch(loword){ case 1: choise = 1; break; case 2: choise = 2; break; case 3: choise = 3; break; default: break; }

InvalidateRect(hwnd, NULL, TRUE); return 0; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rect); SelectObject(hdc, hbrush); SelectObject(hdc, hpen); switch(choise){ case 1: Rectangle(hdc, 600, 100, 624, 300); hbrush = CreateSolidBrush(RGB(0, 255, 0)); hpen = CreatePen(PS_SOLID, 10,RGB(0, 255, 0)); SelectObject(hdc, hbrush); SelectObject(hdc, hpen); Ellipse(hdc, 525, 50, 698, 200); break; case 2: break; case 3: TextOut(hdc, 500, 100, about_text, strlen(about_text)); break; } EndPaint(hwnd, &ps); return 0; case WM_DESTROY : PostQuitMessage(0); return 0; } return DefWindowProc (hwnd, iMsg, wParam, lParam) ; }