Kalender med win32

Kode 

#include <windows>
#include <commctrl>
#include <map>

using namespace std;

HWND c_hwnd;

//////////////////////********** WndProc *************\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{

    switch(msg)
    {
        case WM_CLOSE:
            DestroyWindow(hwnd);
        break;

        case WM_DESTROY:
            PostQuitMessage(0);
        break;
	
	case WM_NOTIFY:	{
		LPNMHDR hdr = (LPNMHDR) lParam;


		switch (hdr->code) {

			case MCN_GETDAYSTATE: {

				NMDAYSTATE* pDayState = (NMDAYSTATE*) lParam;
				MONTHDAYSTATE mds[3];

				for(int i=0; i< pDayState->cDayState; ++i) {
					mds[i] = (MONTHDAYSTATE) 0;	
				}
				mds[1] |= 1<<15;
				
				pDayState->prgDayState = mds;
			}
			break;

			default:
			break;
		}
	}
	break;

        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}


//////////////////////********** MAIN *************\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow)
{
	WNDCLASSEX wc;
	HWND hwnd;
	MSG Msg;
	RECT rc;

	wc.cbSize        = sizeof(WNDCLASSEX);
	wc.style         = 0;
	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 = (HBRUSH)(COLOR_WINDOW+1);
	wc.lpszMenuName  = NULL;
	wc.lpszClassName = "Vækkeur_vindueklasse1";
	wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);


	if(!RegisterClassEx(&wc)) {
		MessageBox(NULL, "Vindueregistreringen har slået fejl.\\nProgrammet lukkes ned", "Fejl", MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}


	INITCOMMONCONTROLSEX icex;

	icex.dwSize = sizeof(icex);
	icex.dwICC = ICC_DATE_CLASSES;

	InitCommonControlsEx(&icex);

	hwnd = CreateWindowEx (
		WS_EX_CLIENTEDGE,
		"Vækkeur_vindueklasse1",
		"Indstillinger for opvækkning",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, 400, 300,
		NULL, NULL, hInstance, NULL);

	 c_hwnd = CreateWindowEx (
				0,
				MONTHCAL_CLASS,
				"",
				WS_BORDER | WS_CHILD | WS_VISIBLE | MCS_DAYSTATE,
				0, 0, 0, 0,
				hwnd, NULL, hInstance, NULL);

	if(hwnd==NULL || c_hwnd==NULL) {
		MessageBox(NULL, "Vinduekreationen har slået fejl.\\nProgrammet lukkes.", "Fejl", MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}

	MonthCal_GetMinReqRect(c_hwnd, &rc);
	SetWindowPos(c_hwnd, NULL, 40, 35, 35 + rc.right, 40 + rc.bottom, SWP_NOZORDER);

	ShowWindow(hwnd, nCmdShow);
	UpdateWindow(hwnd);

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

	return Msg.wParam;
}