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An error occurred after the code for the login form was set up; only one MDI form allowed That is, the loading of the Frmmain form occurs when the MDI is loaded two times, where does the code problem occur? A code problem occurs when the code in the Sub Main () in the module is read, and the logic of the code is problematic. The code is as follows: Sub Main () Dim flogin As New frmlogin ' Dim f

Properties of the date Control Attribute Description MaxDate Get the set maximum Date and Time MinDate Get the set minimum Date and Time Value Date/time value selected by the Control Format Used to set the format of the date and time displayed in the control Use the Anchor attribute In WinForms, the Anchor attribute is provided for the control. You only need to set the Anchor attribute of the control to maintain the rationality

scenarios, if a user editing component needs to be used independently, the user needs to encode the datasource and State (new, modify, delete, and other States) attributes for the user editing component, this allows the user to edit the component to know the object to be processed and the processing method. The following code: Entitycontrolhost. State = new entitycontrolhostaddnewstate () Entitycontrolhost. entitycontrol. datasource = r By now, an entity editing component has been completed, i

++ are the dibview program and showdib program in the SDK package. How can I change the size of a view? Generally, you can call the movewindow () function to change the window size. In an application developed using the MFC Library, the view is a subwindow surrounded by the Framework Window. To change the size of a view, you can call the getparentframe () function to obtain the pointer to the frame window, and then call the movewindow () function to change the size of the parent window. When

);Afxgetmainwnd ()-> sendmessage (wm_section, true, (lparam) hicon );10. How can I change the default window style?Resend cwnd: precreatewindow and modify the createstruct structure to specify the window style and other creation information.Example: Delete "Max" button and set original window's position and sizeBool cmainframe: precreatewindow (createstruct CS){CS. Style = ~ Ws_maxinizemox;CS. x = cs. Y = 0;CS. Cx = getsystemmetrics (sm_cxscreen/2 );CS. Cy = getsystemmetrics (sm_cyscreen/2 );

9. How to make a form of MDI 1. Create a new Windows Application project 2. Add two forms Form1, Form2 3. Set the Form1 IsMdiContainer property to True. Make it the MDI main form. 4. Add a RichTextBox control to the Form2 and set the dock to: Fill 5. Drag a MainMenu to the form Form1 in the Tools form, and then create a menu file| windows| Help three menu items, including new, exit menu items in file,

MDIApplicationProgramIs another important type of document view program. It features that users can open multiple documents at a time, and each document corresponds to a different window; the menu of the main window will automatically change with the change of the subwindow of the current activity; sub-windows can be stacked, tiled, and other operations; Sub-windows can beMDIPosition, change, maximize, and minimize the size of the main window. When the sub-window is maximized, it will be full.MD

Application of Multi-template document view structure I. Overview ① In an MDI program, different types of subwindows need to be used, and each type of window may have many, corresponding to different data. In this case, you can use the multi-template document view structure. This facilitates the use of the document view structure. ② When a certain type of MDI subwindow is created, the opendocumentfile () o

Most complex programs use the MDI framework, which allows the control MDI area to be dragged directly into use in Qt Designer.Qmdiarea is typically used in the main window to hold multiple child windows QmdisubwindowThe code is as follows:Mainwindow.h1 #ifndef Mainwindow_h2 #defineMainwindow_h3 4#include 5#include 6#include 7#include 8 9 namespaceUi {Ten classMainWindow; One } A - classMainWindow: PublicQm

The port of the core switch is mainly a fiber type, but the price of the switch fibre port is very expensive and requires special attention from the user, while the fibre port of the switch is not stacked and can only be used for cascading purposes. Cascading can use either a normal port or a special mdi-ii port. A pass-through cable should be used when the two ports that are cascaded are normal (that is, mdi