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DialogBoxParam function

Creates a modal dialog box from a dialog box template resource. Before displaying the dialog box, the function passes an application-defined value to the dialog box procedure as the lParam parameter of the WM_INITDIALOG message. An application can use this value to initialize dialog box controls.

Syntax


INT_PTR WINAPI DialogBoxParam(
  _In_opt_  HINSTANCE hInstance,
  _In_      LPCTSTR lpTemplateName,
  _In_opt_  HWND hWndParent,
  _In_opt_  DLGPROC lpDialogFunc,
  _In_      LPARAM dwInitParam
);

Parameters

hInstance [in, optional]

Type: HINSTANCE

A handle to the module which contains the dialog box template. If this parameter is NULL, then the current executable is used.

lpTemplateName [in]

Type: LPCTSTR

The dialog box template. This parameter is either the pointer to a null-terminated character string that specifies the name of the dialog box template or an integer value that specifies the resource identifier of the dialog box template. If the parameter specifies a resource identifier, its high-order word must be zero and its low-order word must contain the identifier. You can use the MAKEINTRESOURCE macro to create this value.

hWndParent [in, optional]

Type: HWND

A handle to the window that owns the dialog box.

lpDialogFunc [in, optional]

Type: DLGPROC

A pointer to the dialog box procedure. For more information about the dialog box procedure, see DialogProc.

dwInitParam [in]

Type: LPARAM

The value to pass to the dialog box in the lParam parameter of the WM_INITDIALOG message.

Return value

Type: INT_PTR

If the function succeeds, the return value is the value of the nResult parameter specified in the call to the EndDialog function used to terminate the dialog box.

If the function fails because the hWndParent parameter is invalid, the return value is zero. The function returns zero in this case for compatibility with previous versions of Windows. If the function fails for any other reason, the return value is –1. To get extended error information, call GetLastError.

Remarks

The DialogBoxParam function uses the CreateWindowEx function to create the dialog box. DialogBoxParam then sends a WM_INITDIALOG message (and a WM_SETFONT message if the template specifies the DS_SETFONT or DS_SHELLFONT style) to the dialog box procedure. The function displays the dialog box (regardless of whether the template specifies the WS_VISIBLE style), disables the owner window, and starts its own message loop to retrieve and dispatch messages for the dialog box.

When the dialog box procedure calls the EndDialog function, DialogBoxParam destroys the dialog box, ends the message loop, enables the owner window (if previously enabled), and returns the nResult parameter specified by the dialog box procedure when it called EndDialog.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Winuser.h (include Windows.h)

Library

User32.lib

DLL

User32.dll

Unicode and ANSI names

DialogBoxParamW (Unicode) and DialogBoxParamA (ANSI)

See also

Reference
CreateWindowEx
DialogBox
DialogBoxIndirect
DialogBoxIndirectParam
DialogProc
EndDialog
MAKEINTRESOURCE
WM_INITDIALOG
WM_SETFONT
Conceptual
Dialog Boxes

 

 

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