My Dialog App Download For Pc Windows 7

A dialog box is a temporary window an application creates to retrieve user input. An application typically uses dialog boxes to prompt the user for additional information for menu items. A dialog box usually contains one or more controls (child windows) with which the user enters text, chooses options, or directs the action.

Windows also provides predefined dialog boxes that support common menu items such as Open and Print. Applications that use these menu items should use the common dialog boxes to prompt for this user input, regardless of the type of application.

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You use dialog boxes to display information and prompt for input from the user. Your application loads and initializes the dialog box, processes user input, and destroys the dialog box when the user finishes the task. The process for handling dialog boxes varies, depending on whether the dialog box is modal or modeless. A modal dialog box requires the user to close the dialog box before activating another window in the application. However, the user can activate windows in different applications. A modeless dialog box does not require an immediate response from the user. It is similar to a main window containing controls.

The simplest form of modal dialog box is the message box. Most applications use message boxes to warn the user of errors and to prompt for directions on how to proceed after an error has occurred. You create a message box by using the MessageBox or MessageBoxEx function, specifying the message and the number and type of buttons to display. The system creates a modal dialog box, providing its own dialog box template and procedure. After the user closes the message box, MessageBox or MessageBoxEx returns a value identifying the button chosen by the user to close the message box.

You create a modal dialog box by using the DialogBox function. You must specify the identifier or name of a dialog box template resource and a pointer to the dialog box procedure. The DialogBox function loads the template, displays the dialog box, and processes all user input until the user closes the dialog box.

In the following example, the application displays a modal dialog box when the user clicks Delete Item from an application menu. The dialog box contains an edit control (in which the user enters the name of an item) and OK and Cancel buttons. The control identifiers for these controls are ID_ITEMNAME, IDOK, and IDCANCEL, respectively.

The first part of the example consists of the statements that create the modal dialog box. These statements, in the window procedure for the application's main window, create the dialog box when the system receives a WM_COMMAND message having the IDM_DELETEITEM menu identifier. The second part of the example is the dialog box procedure, which retrieves the contents of the edit control and closes the dialog box upon receiving a WM_COMMAND message.

In this example, the application specifies its main window as the owner window for the dialog box. When the system initially displays the dialog box, its position is relative to the upper left corner of the owner window's client area. The application uses the return value from DialogBox to determine whether to proceed with the operation or cancel it. The following statements define the dialog box procedure.

In this example, the procedure uses GetDlgItemText to retrieve the current text from the edit control identified by ID_ITEMNAME. The procedure then calls the EndDialog function to set the dialog box's return value to either IDOK or IDCANCEL, depending on the message received, and to begin the process of closing the dialog box. The IDOK and IDCANCEL identifiers correspond to the OK and Cancel buttons. After the procedure calls EndDialog, the system sends additional messages to the procedure to destroy the dialog box and returns the dialog box's return value back to the function that created the dialog box.

You create a modeless dialog box by using the CreateDialog function, specifying the identifier or name of a dialog box template resource and a pointer to the dialog box procedure. CreateDialog loads the template, creates the dialog box, and optionally displays it. Your application is responsible for retrieving and dispatching user input messages to the dialog box procedure.

The statements in the first part of the example create the modeless dialog box. These statements, in the window procedure for the application's main window, create the dialog box when the window procedure receives a WM_COMMAND message having the IDM_GOTO menu identifier, but only if the global variable does not already contain a valid handle. The second part of the example is the application's main message loop. The loop includes the IsDialogMessage function to ensure that the user can use the dialog box keyboard interface in this modeless dialog box. The third part of the example is the dialog box procedure. The procedure retrieves the contents of the edit control and check box when the user clicks the OK button. The procedure destroys the dialog box when the user clicks the Cancel button.

In the preceding statements, CreateDialog is called only if hwndGoto does not contain a valid window handle. This ensures that the application does not display two dialog boxes at the same time. To support this method of checking, the dialog procedure must set to NULL when it destroys the dialog box.

The loop checks the validity of the window handle to the dialog box and only calls the IsDialogMessage function if the handle is valid. IsDialogMessage only processes the message if it belongs to the dialog box. Otherwise, it returns FALSE and the loop dispatches the message to the appropriate window.

If the user clicks the OK button, the procedure retrieves the current state of the check box and assigns it to the fRelative variable. It then uses the variable to retrieve the line number from the edit control. GetDlgItemInt translates the text in the edit control into an integer. The value of fRelative determines whether the function interprets the number as a signed or unsigned value. If the edit control text is not a valid number, GetDlgItemInt sets the value of the fError variable to nonzero. The procedure checks this value to determine whether to display an error message or carry out the task. In the event of an error, the dialog box procedure sends a message to the edit control, directing it to select the text in the control so that the user can easily replace it. If GetDlgItemInt does not return an error, the procedure can either carry out the requested task itself or send a message to the owner window, directing it to carry out the operation.

You initialize the dialog box and its contents while processing the WM_INITDIALOG message. The most common task is to initialize the controls to reflect the current dialog box settings. Another common task is to center a dialog box on the screen or within its owner window. A useful task for some dialog boxes is to set the input focus to a specified control rather than accept the default input focus.

In the following example, the dialog box procedure centers the dialog box and sets the input focus while processing the WM_INITDIALOG message. To center the dialog box, the procedure retrieves the window rectangles for the dialog box and the owner window and calculates a new position for the dialog box. To set the input focus, the procedure checks the wParam parameter to determine the identifier of the default input focus.

In the preceding statements, the procedure uses the GetParent function to retrieve the owner window handle to a dialog box. The function returns the owner window handle to dialog boxes, and the parent window handle to child windows. Because an application can create a dialog box that has no owner, the procedure checks the returned handle and uses the GetDesktopWindow function to retrieve the desktop window handle, if necessary. After calculating the new position, the procedure uses the SetWindowPos function to move the dialog box, specifying the HWND_TOP value to ensure that the dialog box remains on top of the owner window.

Applications sometimes adapt or modify the content of dialog boxes depending on the current state of the data being processed. In such cases, it is not practical to provide all possible dialog box templates as resources in the application's executable file. But creating templates in memory gives the application more flexibility to adapt to any circumstances.

In a dialog template, all character strings, such as the dialog box and button titles, must be Unicode strings. This example uses the MultiByteToWideChar function to generate these Unicode strings.

The DLGITEMTEMPLATE structures in a dialog template must be aligned on DWORD boundaries. To align these structures, this example uses a helper routine that takes an input pointer and returns the closest pointer that is aligned on a DWORD boundary.

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