MFC Data Type

The following data types are used together with Win32 programs.

Bool: Boolean value; Value: true or false

BSTR: 32-bit character pointer

Byte: an 8-bit integer with no plus or minus signs

Colorref: 32-bit value, representing a color value

DWORD: 32-bit integer without plus or minus signs

Long: 32-bit integer with positive and negative numbers

Lparam: 32-bit integer, used as a parameter of the window function or callback function.

Lpcstr: 32-bit pointer, pointing to a constant string

Lpstr: 32-bit pointer, pointing to a string

Lpctstr: 32-bit pointer, pointing to a constant string, which can be transplanted to Unicode and DBCS

Lptstr: 32-bit pointer, pointing to a string, which can be transplanted to Unicode and DBCS

Lpvoid: 32-bit pointer, pointing to an unspecified type of data

Lpresult: 32-bit value, which is returned by the window function or callback function.

Uint: In Win16, It is a 16-bit integer without plus or minus signs. in Win32, It is a 32-bit integer without plus or minus signs,

Wndproc: 32-bit pointer, pointing to a window function

Word: A 16-bit integer without a plus or minus sign

Wparam: a parameter of the window function or callback function. It is 16-bit in Win16 and 32-bit in Win32.

The following are the unique data types of MFC:

Position: A value that represents the position of elements in a collection object (such as an array or a linked list). It is often used in MFC collection classes (that is, data processing classes, such as carray)

Lpcrect: 32-bit pointer pointing to an unchanged rect Structure