C++, WinApi, Month Calendar Control - c++

Question

I need a Calendar application to get START and END dates (2 DATES) from the user. I do not know how to implement it in the best way. So, I started looking this Month Calendar Control example. It has only one calendar, but I need 2-month calendars.
But, the first problem I faced is that I am getting this error
Error LNK2019 unresolved external symbol __imp_InitCommonControlsEx referenced in function "void __cdecl CreateControls(struct HWND__ *)" (?CreateControls##YAXPEAUHWND__###Z)
I cannot figure out the solution.
The complete code as given on the website:
#include <windows.h>
#include <commctrl.h>
#include <wchar.h>
#include <strsafe.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void CreateControls(HWND);
void GetSelectedDate(HWND, HWND);
HWND hStat;
HWND hMonthCal;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow) {
HWND hwnd;
MSG msg;
WNDCLASSW wc = {0};
wc.lpszClassName = L"Month Calendar";
wc.hInstance = hInstance ;
wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
wc.lpfnWndProc = WndProc ;
wc.hCursor = LoadCursor(0, IDC_ARROW);
RegisterClassW(&wc);
hwnd = CreateWindowW(wc.lpszClassName, L"Month Calendar",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
100, 100, 250, 300, 0, 0, hInstance, 0);
while (GetMessage(&msg, NULL, 0, 0)) {
DispatchMessage(&msg);
}
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam) {
LPNMHDR lpNmHdr;
switch(msg) {
case WM_CREATE:
CreateControls(hwnd);
break;
case WM_NOTIFY:
lpNmHdr = (LPNMHDR) lParam;
if (lpNmHdr->code == MCN_SELECT) {
GetSelectedDate(hMonthCal, hStat);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProcW(hwnd, msg, wParam, lParam);
}
void CreateControls(HWND hwnd) {
hStat = CreateWindowW(WC_STATICW, L"",
WS_CHILD | WS_VISIBLE, 80, 240, 80, 30,
hwnd, (HMENU)1, NULL, NULL);
INITCOMMONCONTROLSEX icex;
icex.dwSize = sizeof(icex);
icex.dwICC = ICC_DATE_CLASSES;
InitCommonControlsEx(&icex);
hMonthCal = CreateWindowW(MONTHCAL_CLASSW, L"",
WS_BORDER | WS_CHILD | WS_VISIBLE | MCS_NOTODAYCIRCLE,
20, 20, 200, 200, hwnd, (HMENU)2, NULL, NULL);
}
void GetSelectedDate(HWND hMonthCal, HWND hStat) {
SYSTEMTIME time;
const int dsize = 20;
wchar_t buf[dsize];
ZeroMemory(&time, sizeof(SYSTEMTIME));
SendMessage(hMonthCal, MCM_GETCURSEL, 0, (LPARAM) &time);
size_t cbDest = dsize * sizeof(wchar_t);
StringCbPrintfW(buf, cbDest, L"%d-%d-%d",
time.wYear, time.wMonth, time.wDay);
SetWindowTextW(hStat, buf);
}

Answer 1

You need to link Comctl32.lib:
#pragma comment(lib,"Comctl32.lib")