The MFC library provides a rich series of collection classes aimed at providing an easy and safe way to manage dynamic data. The MFC library collection classes are divided into two categories: template-based and non-template classes.
The Template Classes
CArray – Supports arrays that can dynamically reduce and grow as necessary.
For further detailed reading – https://docs.microsoft.com/en-us/cpp/mfc/reference/carray-class?view=vs-2019
CList – supports ordered lists of nonunique objects accessible sequentially or by value.
https://docs.microsoft.com/en-us/cpp/mfc/reference/clist-class?view=vs-2019
CMap – is a dictionary collection class that maps unique keys to values
https://docs.microsoft.com/en-us/cpp/mfc/reference/cobject-class?view=vs-2019
CtypedPtrArray – Provides a type-safe “wrapper” for objects of class CPtrArray or CObArray.
https://docs.microsoft.com/en-us/cpp/mfc/reference/ctypedptrarray-class?view=vs-2019
CTypedPtrList – Provides a type-safe “wrapper” for objects of class CPtrList
https://docs.microsoft.com/en-us/cpp/mfc/reference/ctypedptrlist-class?view=vs-2019
CTypedPtrMap – Provides a type-safe “wrapper” for objects of the pointer-map classes CMapPtrToPtr, CMapPtrToWord, CMapWordToPtr, and CMapStringToPtr.
https://docs.microsoft.com/en-us/cpp/mfc/reference/ctypedptrmap-class?view=vs-2019
The Non-Template Classes
CObArray – Supports arrays of CObject pointers.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cobarray-class?view=vs-2019
CByteArray – Supports dynamic arrays of bytes.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cbytearray-class?view=vs-2019
CDWordArray – Supports arrays of 32-bit doublewords.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cdwordarray-class?view=vs-2019
CPtrArray – Supports arrays of void pointers.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cptrarray-class?view=vs-2019
CStringArray – Supports arrays of CString objects.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cstringarray-class?view=vs-2019
CWordArray – Supports arrays of 16-bit words
https://docs.microsoft.com/en-us/cpp/mfc/reference/cwordarray-class?view=vs-2019
CUIntArray – Supports arrays of unsigned integers.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cuintarray-class?view=vs-2019
CObList – Supports ordered lists of nonunique CObject pointers accessible sequentially or by pointer value.
https://docs.microsoft.com/en-us/cpp/mfc/reference/coblist-class?view=vs-2019
CPtrList – Supports lists of void pointers.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cptrlist-class?view=vs-2019
CStringList – Supports lists of CString objects.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cstringlist-class?view=vs-2019
CmapPtrToWord – Supports maps of 16-bit words keyed by void pointers.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cmapptrtoword-class?view=vs-2019
CMapPtrToPtr – Supports maps of void pointers keyed by void pointers.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cmapptrtoptr-class?view=vs-2019
CMapStringToOb – A dictionary collection class that maps unique CString objects to CObject pointers.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cmapstringtoob-class?view=vs-2019
CMapStringToPtr – Supports maps of void pointers keyed by CString objects.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cmapstringtoptr-class?view=vs-2019
CMapStringToString – Supports maps of CString objects keyed by CString objects.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cmapstringtostring-class?view=vs-2019
CMapWordToOb – Supports maps of CObject pointers keyed by 16-bit words
https://docs.microsoft.com/en-us/cpp/mfc/reference/cmapwordtoob-class?view=vs-2019
CMapWordToPtr – Supports maps of void pointers keyed by 16-bit words.
https://docs.microsoft.com/en-us/cpp/mfc/reference/cmapwordtoptr-class?view=vs-2019
Simple Data Type Classes
MFC supplies a number of classes to encapsulate various data types widely used as parameters to the member functions of Windows classes. These are
CStringT – Holds character strings.
CTime – Holds absolute time and date values.
COleDateTime – Wrapper for the OLE automation type DATE.
CTimeSpan – Holds relative time and date values.
COleDateTimeSpan – Holds relative COleDateTime values
CPoint – Holds coordinate (x, y) pairs.
CSize – Holds distance, relative positions, or paired values.
CRect – Holds coordinates of rectangular areas.
CImageList – Provides the functionality of the Windows image list.
COleVariant – Wrapper for the OLE automation type VARIANT
COleCurrency – Wrapper for the OLE automation type CURRENCY
For further detailed reading
https://docs.microsoft.com/en-us/cpp/mfc/simple-data-type-classes?view=vs-2019
File Input and Output
MFC encapsulates the windows API file handling functions in the CFile class. If includes member functions for opening and closing files, reading and writing file data, deleting and renaming files, and retrieving file information. For a full description of the Cfile class and associated member function go to the following. For further reading
https://docs.microsoft.com/en-us/cpp/mfc/reference/cfile-class?view=vs-2019
