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Graduation design has not finished, but my old habits again committed, for a small problem tangled up for me for a long time, but by the wind of Baidu and Google, I still can not find the answer, finally in an unexpected thinking to solve the

Windows uses a CreateWindowEx function to create a form that determines the style of the window by passing arguments to the function. The CreateParams virtual function is a vcl called before the window is created to get the style of the window to

Interface style If you have used windows-based applications, you may have noticed that not all user interfaces look or operate the same. There are two main types of user interface styles: Single Document Interface (SDI) and multiple Document interface (MDI). An example of an SDI interface is the WordPad (Notepad) application in Microsoft Windows (Figure 6.1). In WordPad, you can open only one document, and when you want to open another document, you

MDI Notepad ApplicationThe MDI NotePad sample application is a simple text editor similar to the NotePad application contained in MicrosoftWindows. However, the MDI NotePad application uses a multiple-document interface (MDI). At run time, the application creates a new instance of the subform if the user needs a new do

to 1. 9. Repeat step 5-8 for subsequent elements in the array. The elements of the Key menu control array must be contiguous in the Menu control list box and must be at the same indent level. When you create a menu control array, you include the separator bar that appears in the menu. Create and modify menus at run timeMenus created at design time can also dynamically respond to run-time conditions. For example, if the action of a menu item becomes inappropriate at some point, the selection

Wm_fontchange 0x001d This message is sent to all top-level windows when the system's font repository changes Wm_timechange 0x001e Send this message to all top-level windows when the system's time changes Wm_cancelmode 0x001f Send this message to cancel an operation that is in progress Wm_setcursor 0x0020

will be activated and the current activity (about to lose the activation) window will receive this message, sending this message to the application which window is active, which is the inactive Wm_fontchange 0x001d This message is sent to all top-level windows when the system's font repository changes Wm_timechange 0x001e Send this message to all top-level windows when the system's time changes

0x0020 If the mouse causes the cursor to move through a window and the mouse input is not captured, send a message to the window Wm_mouseactivate 0x0021 When the cursor is in a non-activated window and the user is pressing a key on the mouse to send this message to the current window Wm_childactivate 0x0022 Send this message to the MDI child window when the user taps the title bar of this wind

,Wm_systemerror = 0x0017;Wm_showwindow = 0x0018;When the hidden or displayed window is sent this message to this windowWm_activateapp = 0x001c;Send this message to the application which window is active and which is inactive;Wm_fontchange = 0x001d;This message is sent to all top-level windows when the system's font repository changesWm_timechange = 0x001e;Send this message to all top-level windows when the system's time changesWm_cancelmode = 0x001f;Send this message to cancel an in-progress sta

send this message to the current windowWm_childactivate = $0022;Send this message to the MDI subwindow. When the user clicks the title bar of this window, or the window is activated, move and change the size.Wm_queuesync =$ 0023;This message is sent by a computer-based training program through the wh_journalpalyback hook ProgramSeparates user input messagesWm_getminmaxinfo =$ 0024;This message is sent to the window when it is about to change the size

is sent to a window.Wm_mouseactivate =$ 0021;When the cursor is in an inactive window and the user is pressing a key of the mouse to send this message to the current windowWm_childactivate = $0022;Send this message to the MDI subwindow. When the user clicks the title bar of this window, or the window is activated, move and change the size.Wm_queuesync =$ 0023;This message is sent by a computer-based training program through the wh_journalpalyback hoo

window in which the message is sent to the application is activated and the window in which the message is not activated;Wm_fontchange = $ 001d; send this message to all top-level windows when the font resource pool of the system changesWm_timechange = $ 001e; send this message to all top-level windows when the system time changesWm_cancelmode = $ 001f; send this message to cancel an ongoing touch (Operation)Wm_setcursor = $0020; if the mouse causes the cursor to move in a window and the mouse

this message to all top-level windows wm_endsession =0016 0017; when the system process sends the wm_queryendsession message, this message is sent to the application to notify it whether the conversation ends wm_systemerror = $; wm_showwindow = $0018; when the hidden or display window sends this message to the window wm_activateapp = $ 001c; the window to which the message is sent to the application is activated and the window is not activated; wm_fontchange = $ 001d; send this message to all t

= $ 001c; Which window of the application is activated and which is not activated; Wm_fontchange = $ 001d; This message is sent to all top-level windows when the font resource library of the system changes Wm_timechange = $ 001e; Send this message to all top-level windows when the system time changes Wm_cancelmode = $ 001f; Send this message to cancel an ongoing touch (Operation) Wm_setcursor =$ 0020; If the mouse causes the cursor to move in a window and the mouse input is not captured, a mess

which is not activated;Wm_fontchange = $ 001d;This message is sent to all top-level windows when the font resource library of the system changesWm_timechange = $ 001e;Send this message to all top-level windows when the system time changesWm_cancelmode = $ 001f;Send this message to cancel an ongoing touch (Operation)Wm_setcursor =$ 0020;If the mouse causes the cursor to move in a window and the mouse input is not captured, a message is sent to a window.Wm_mouseactivate =$ 0021;When the cursor is

window in which the message is sent to the application is activated and the window in which the message is not activated;Wm_fontchange = $ 001d; send this message to all top-level windows when the font resource pool of the system changesWm_timechange = $ 001e; send this message to all top-level windows when the system time changesWm_cancelmode = $ 001f; send this message to cancel an ongoing touch (Operation)Wm_setcursor = $0020; if the mouse causes the cursor to move in a window and the mouse

= $0018; when the hidden or displayed window is sent to this windowWm_activateapp = $ 001c; the window in which the message is sent to the application is activated and the window in which the message is not activated;Wm_fontchange = $ 001d; send this message to all top-level windows when the font resource pool of the system changesWm_timechange = $ 001e; send this message to all top-level windows when the system time changesWm_cancelmode = $ 001f; send this message to cancel an ongoing touch (O

to the MDI subwindow. When the user clicks the title bar of this window, or the window is activated, move and change the size. Wm_queuesync =$ 0023; This message is sent by a computer-based training program through the wh_journalpalyback hook Program Separates user input messages Wm_getminmaxinfo =$ 0024; This message is sent to the window when it is about to change the size or position; Wm_painticon = $0026; Send to minimize window whe

=$ 0016; After the system process sends the wm_queryendsession message, the message is sent to the application, Indicates whether the conversation ends. Wm_systemerror = $0017; Wm_showwindow =$ 0018; This message is sent to the hidden or displayed window. Wm_activateapp = $ 001c; Which window of the application is activated and which is not activated; Wm_fontchange = $ 001d; This message is sent to all top-level windows when the font resource library of the system changes Wm

which is not activated;Wm_fontchange = $ 001d;This message is sent to all top-level windows when the font resource library of the system changesWm_timechange = $ 001e;Send this message to all top-level windows when the system time changesWm_cancelmode = $ 001f;Send this message to cancel an ongoing touch (Operation)Wm_setcursor =$ 0020;If the mouse causes the cursor to move in a window and the mouse input is not captured, a message is sent to a window.Wm_mouseactivate =$ 0021;When the cursor is