win32api. MessageBox

int MessageBox(
  HWND    hWnd,
  LPCTSTR lpText,
  LPCTSTR lpCaption,
  UINT    uType
);

Requirements. 

Header : winuser.h (include windows.h)

Library : user32.lib 

DLL : user32.dll

example codes

int DisplayResourceNAMessageBox() {     int msgboxID = MessageBox(         NULL,         (LPCWSTR)L"Resource not available\nDo you want to try again?",         (LPCWSTR)L"Account Details",         MB_ICONWARNING | MB_CANCELTRYCONTINUE | MB_DEFBUTTON2     );     switch (msgboxID)     {     case IDCANCEL:         // TODO: add code         break;     case IDTRYAGAIN:         // TODO: add code         break;     case IDCONTINUE:         // TODO: add code         break;     }     return msgboxID; }

from MS : https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-messagebox

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