Win32 Windows programming Seven

Timer messages

1, Wm_timer

Automatically sends a timer message wm_timer to the window according to the time period set by the timer. Relatively low priority level

Low timer accuracy, millisecond level, and low message generation time

2. Messages and Functions

WM_TIMER: Message ID

ID of the WParam timer

Processing function of LParam timer

SetTimer : Setting a Timer

Uint_ptr SetTimer (  hwnd  hwnd,              //Handle to window handle can be null    uint_ptr nidevent ,       Timer identifier  Timer ID 0 is not preset ID  UINT  uelapse,           / /time-out value  timer interval    timerproc  lptimerfunc   //Timer Procedure  Timer processing function, can be null);

Returns a created Timer ID

KillTimer : End a timer

           BOOL KillTimer (HWND hwnd,/   /handle   to window handle  Uint_ PTR  uidevent   //Timer identifier  Timer ID);

Timerproc: Timer handler function

VOID CALLBACK Timerproc (hwnd  hwnd,         //Handle to  window   handle  UINT   umsg ,          Wm_timer messagewm_timer messages ID  uint_ptr  idevent  ,  //Timer identifier  Timer ID  DWORD  dwtime        //  current system time   );

3. How to use

3.1 Creating Timers

3.1.1 Specifies the window handle HWND so the Timerproc parameter can be empty, then the WM_TIMER message will be sent to the specified window.

If not specified, the Timerproc cannot be empty and a timer handler must be specified.

3.1.2 If the timer ID settimer will create a timer based on this ID, if not specified, it will return a create timer ID

3.2 Processing Timer messages

can be processed separately according to the message incoming timer ID number

3.3 End Timer

KillTimer End timer when not in use

Menu

1. Menu Basics

Menu-Each menu will have a hmenu handle

menu item: Each menu item will have an ID number that can perform different actions depending on the ID.

2. Menu creation

2. Creation of the 1 menu

Createmenu-menu Menu

Createpopupmenu-popupmenu Pop-up menu

AppendMenu-Add menu item

BOOL appendmenu (  HMENU  HMENU,         //Handle  to menu handle   UINT uflags ,          Menu-item Options  menu item Identification   uint_ptr  uidnewitem//identifier, menu, The ID  of the Or submenu menu item or the self-   lpctstr  lpnewitem    //menu-item content  the name of the menu item );

Uflags

Mf_string-lpnewitem is a string

Mf_popup-uidnewitem is a sub-menu handle

Mf_separator-Adding split items

Mf_checket/mf_unchecked-Set and cancel the checkmark for a menu item

Mf_disabled/mf_enable-menu item forbidden and allowed states

2.2 Menu Command Response

2.2.1 Wm_conmand message

When a user taps a menu, button control, and so on, the system sends a WM_COMMAND message to the window.

Identification of the WPARAM:HIWORD notification message

LOWORD Generate Message ID number/or something else

LPARAM: Handle to the control, empty for menu

2.2.2 Command Processing

Processing according to the ID number of the message item

2.3 Status of the menu item

2.3.1 Wm_initmenupopup News

When the user clicks the menu to display the pop-up menu, the same will be sent to the window Wm_initmenupopup

WPARAM is a menu handle

Lparam:loword Menu Location

Whether the HiWord is a system menu

2.3.2 Command Processing