#include <Windows.h>
#include <stdio.h>
#include <math.h>


TCHAR className[] = TEXT("NazwaKlasy");

LRESULT CALLBACK WindowProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
///////////			WIN MAIN		//////////
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstace, LPSTR lpCmdLine, int NCmdShow) {

	WNDCLASSEX wc = {0};

	wc.cbSize = sizeof(WNDCLASSEX);
	wc.lpfnWndProc = WindowProc;
	wc.hInstance = hInstance;
	wc.lpszClassName = className;
	wc.hbrBackground = CreateSolidBrush(RGB(255, 0, 0));
	wc.style = CS_HREDRAW | CS_VREDRAW;

	if (!RegisterClassEx(&wc)) {
		MessageBox(0,TEXT("Odmowa rejestracji okna"), TEXT("ODMOWA"), MB_OK);
	}

	HWND h = CreateWindowEx(WS_EX_WINDOWEDGE, className, TEXT("HELLO WORLD"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 500, NULL, NULL, hInstance, NULL);

	if (!h) {
		MessageBox(0, TEXT("Odmowa stworzenia okna"), TEXT("ODMOWA"), MB_OK);
			UnregisterClass(className, hInstance);
			return 0;
	}

	ShowWindow(h, NCmdShow);
	UpdateWindow(h);

	MSG msg;

	while (GetMessage(&msg, 0, 0, 0) > 0) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	UnregisterClass(className, hInstance);

	return msg.wParam;
}

///////////		SWITCH		//////////

LRESULT CALLBACK WindowProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
	static int cxClient, cyClient;
	int szer_prz = 150, wys_prz = 30;
	DWORD dlugosc;
	LPSTR Bufor;
	int ID_RADIO1 = GetDlgCtrlID( GetDlgItem(hWnd, 2) );
	int ID_RADIO2 = GetDlgCtrlID( GetDlgItem(hWnd, 3) );
	char wyn[10];

	switch (Msg)
	{

	case WM_CREATE:

		CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", NULL, WS_CHILD | WS_VISIBLE | BS_CHECKBOX, 100, 100, szer_prz, wys_prz, hWnd, (HMENU)1, GetModuleHandle(NULL), NULL);

		CreateWindowEx(WS_EX_CLIENTEDGE, "BUTTON", "CM NA CAL", WS_CHILD | WS_VISIBLE | BS_RADIOBUTTON, 100, 150, szer_prz, wys_prz, hWnd, (HMENU)2, GetModuleHandle(NULL), NULL);

		CreateWindowEx(WS_EX_CLIENTEDGE, "BUTTON", "CAL NA CM", WS_CHILD | WS_VISIBLE | BS_RADIOBUTTON, 100, 200, szer_prz, wys_prz, hWnd, (HMENU)3, GetModuleHandle(NULL), NULL);

		CreateWindowEx(WS_EX_CLIENTEDGE, "STATIC", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER, 100, 250, szer_prz, wys_prz, hWnd, (HMENU)4, GetModuleHandle(NULL), NULL);

		break;

	case WM_SIZE: //Gdy okno zmienia rozmiar

		cxClient = LOWORD( lParam );
		cyClient = HIWORD( lParam );

		MoveWindow(GetDlgItem(hWnd, 1), cxClient / 2 - 65, cyClient / 2 - 75, szer_prz, wys_prz, TRUE);

		MoveWindow(GetDlgItem(hWnd, 2), cxClient / 2 - 65, cyClient / 2 - 25, szer_prz, wys_prz, TRUE);

		MoveWindow(GetDlgItem(hWnd, 3), cxClient / 2 - 65, cyClient / 2 + 25, szer_prz, wys_prz, TRUE);

		MoveWindow(GetDlgItem(hWnd, 4), cxClient / 2 - 65, cyClient / 2 + 75, szer_prz, wys_prz, TRUE);

		break;

	case WM_COMMAND:

		dlugosc = GetWindowTextLength(GetDlgItem(hWnd, 1));		//******************************
		Bufor = (LPSTR) GlobalAlloc(GPTR, dlugosc + 1 );		// POBIERANIE TEKSTU DO BUFORA
		GetWindowText(GetDlgItem(hWnd, 1), Bufor, dlugosc + 1);	//******************************

		double liczba;

		liczba = atof(Bufor);
		liczba = liczba * 2,54;
		sprintf(wyn,"%0.3f",liczba);

		SetWindowText(GetDlgItem(hWnd, 4), wyn);				// USTAWIENIE TEKSTU STATIC'A

		GlobalFree( Bufor );									//ZWOLNIENIE PAMIĘCI BUFORA

		break;

	case WM_CLOSE:
		DestroyWindow(hWnd);
		break;

	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(hWnd, Msg, wParam, lParam);
	}

	return 0;
}