#include <Windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR LpCmdLine, int nCmdShow)
{
	HWND hMainWnd;
	static LPCWSTR szClassName= L"MyClass";
	MSG msg;
		WNDCLASSEX wc;
		wc.cbSize			= sizeof(wc);
		wc.style			= CS_HREDRAW | CS_VREDRAW;
		wc.lpfnWndProc		= WndProc;
		wc.cbClsExtra		= 0;
		wc.cbWndExtra		= 0;
		wc.hInstance		= hInstance;
		wc.hIcon			= LoadIcon(NULL, IDI_APPLICATION);
		wc.hCursor			= LoadCursor(NULL, IDC_ARROW);
		wc.hbrBackground	= static_cast <HBRUSH>(GetStockObject (WHITE_BRUSH));
		wc.lpszMenuName	= NULL;
		wc.lpszClassName	        = szClassName;
		wc.hIconSm		= LoadIcon(NULL, IDI_APPLICATION);

		if(!RegisterClassEx(&wc)) {
			MessageBox(NULL, L"Can not registr class",L"Error",MB_OK);
			return 0;
		}

		hMainWnd = CreateWindow (szClassName,(LPCWSTR)"A Hallo1 Application", WS_OVERLAPPEDWINDOW, 
			CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT, 
			0, 0, 
			hInstance,0);
		if (!hMainWnd) {
			MessageBox(NULL, L"Can not create main window",L"Error",MB_OK);
			return 0;
		}

		ShowWindow(hMainWnd,nCmdShow);
		UpdateWindow(hMainWnd);

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

		return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HDC hDC;
	PAINTSTRUCT ps;
	RECT rect;

	switch (uMsg)
	{
	case WM_PAINT: hDC = BeginPaint(hWnd, &ps);
		GetClientRect(hWnd, &rect);
		DrawText(hDC, L"Hello World", -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
		EndPaint(hWnd, &ps);
		break;
	case WM_CLOSE:
		DestroyWindow(hWnd);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default: DefWindowProc(hWnd, uMsg, wParam, lParam);
	}

	return 0;
} 

void ErrorExit(LPTSTR lpszFunction) 
{ 
    // Retrieve the system error message for the last-error code

    LPVOID lpMsgBuf;
    LPVOID lpDisplayBuf;
    DWORD dw = GetLastError(); 

    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | 
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPTSTR) &lpMsgBuf,
        0, NULL );

    // Display the error message and exit the process

    lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT, 
        (lstrlen((LPCTSTR)lpMsgBuf) + lstrlen((LPCTSTR)lpszFunction) + 40) * sizeof(TCHAR)); 
    StringCchPrintf((LPTSTR)lpDisplayBuf, 
        LocalSize(lpDisplayBuf) / sizeof(TCHAR),
        TEXT("%s failed with error %d: %s"), 
        lpszFunction, dw, lpMsgBuf); 
    MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT("Error"), MB_OK); 

    LocalFree(lpMsgBuf);
    LocalFree(lpDisplayBuf);
    ExitProcess(dw); 
}