Win32 API Constants Reference

Window Messaging Constants

WM_NULL

0x0000

Notifies an application of a null message.

WM_CREATE

0x0001

Notifies an application of the creation of a window.

WM_DESTROY

0x0002

Notifies an application of the destruction of a window.

WM_MOVE

0x0003

Notifies an application of a change in the position of a window.

WM_SIZE

0x0005

Notifies an application of a change in the size of a window.

WM_ACTIVATEAPP

0x0018

Notifies an application that a specified window is being deactivated or activated.

WM_PAINT

0x000F

Notifies an application that a part or all of a window has been invalidated and needs to be redrawn.

Window Style Constants

WS_OVERLAPPED

0x00000000L

Creates an overlapped window.

WS_POPUP

0x80000000L

Creates a popup window.

WS_CHILD

0x40000000L

Creates a child window.

WS_MINIMIZEBOX

0x00020000L

Includes a minimize button.

WS_MAXIMIZEBOX

0x00010000L

Includes a maximize button.

WS_CAPTION

0x00800000L

Includes a window caption (title bar).

WS_THICKFRAME

0x00400000L

Includes a thick, resizable frame.

File Attribute Constants

FILE_ATTRIBUTE_READONLY

0x00000001

The file is read-only.

FILE_ATTRIBUTE_HIDDEN

0x00000002

The file is hidden.

FILE_ATTRIBUTE_SYSTEM

0x00000004

The file is a system file.

FILE_ATTRIBUTE_DIRECTORY

0x00000010

The file is a directory.

FILE_ATTRIBUTE_ARCHIVE

0x00000020

The file is an archive file.

Error Code Constants

ERROR_SUCCESS

0

The operation completed successfully.

ERROR_INVALID_FUNCTION

1

Incorrect function.

ERROR_FILE_NOT_FOUND

2

The system cannot find the file specified.

ERROR_ACCESS_DENIED

5

Access is denied.

ERROR_INVALID_HANDLE

6

The handle is invalid.