This system-provided window procedure processes the actions that control the operation of windows.

Purpose

General window messages are used for standard processing. These messages can be requested from the system or sent to the system for information, or for actions such as create window, validate window, track mouse movement, and select and deselect actions.

Reserved Messages

These message ranges are reserved:

WM_USER

All messages below this value are reserved for system use. Private messages must have an identifier with a value of WM_USER or higher.

Note: The operating system uses certain message values higher than WM_USER. These message values should not be used by an application. A partial listing of these messages is in the following figure:

From PMSTDDLG.H:

#define FDM_FILTER       WM_USER+40
#define FDM_VALIDATE     WM_USER+41
#define FDM_ERROR        WM_USER+42

#define FNTM_FACENAMECHANGED   WM_USER+50
#define FNTM_POINTSIZECHANGED  WM_USER+51
#define FNTM_STYLECHANGED      WM_USER+52
#define FNTM_COLORCHANGED      WM_USER+53
#define FNTM_UPDATEPREVIEW     WM_USER+54
#define FNTM_FILTERLIST        WM_USER+55

You should scan your header files to see if other messages have been defined with values higher than WM_USER.

General Window Styles

The window is the mechanism by which the application communicates with the operator. Each window can have a window style that controls the appearance and behavior of the window. There are also class styles that apply to all the windows of a particular class (class being FRAME, BUTTON, and so on).

See Window Class Styles and Window Styles for more information.

---

[Back] [Next]