DLGPROC callback function

Application-defined callback function used with the CreateDialog and DialogBox families of functions. It processes messages sent to a modal or modeless dialog box. The DLGPROC type defines a pointer to this callback function. DialogProc is a placeholder for the application-defined function name.

Syntax

DLGPROC Dlgproc;

INT_PTR Dlgproc(
  HWND Arg1,
  UINT Arg2,
  WPARAM Arg3,
  LPARAM Arg4
)
{...}

Parameters

Arg1

Arg2

Arg3

Arg4

Return Value

Type: INT_PTR

Typically, the dialog box procedure should return TRUE if it processed the message, and FALSE if it did not. If the dialog box procedure returns FALSE, the dialog manager performs the default dialog operation in response to the message.

If the dialog box procedure processes a message that requires a specific return value, the dialog box procedure should set the desired return value by calling SetWindowLong(hwndDlg, DWL_MSGRESULT, lResult) immediately before returning TRUE. Note that you must call SetWindowLong immediately before returning TRUE; doing so earlier may result in the DWL_MSGRESULT value being overwritten by a nested dialog box message.

The following messages are exceptions to the general rules stated above. Consult the documentation for the specific message for details on the semantics of the return value.

Remarks

You should use the dialog box procedure only if you use the dialog box class for the dialog box. This is the default class and is used when no explicit class is specified in the dialog box template. Although the dialog box procedure is similar to a window procedure, it must not call the DefWindowProc function to process unwanted messages. Unwanted messages are processed internally by the dialog box window procedure.

Requirements

   
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header winuser.h (include Windows.h)

See Also

Conceptual

CreateDialog

CreateDialogIndirect

CreateDialogIndirectParam

CreateDialogParam

DefWindowProc

Dialog Boxes

DialogBox

DialogBoxIndirect

DialogBoxIndirectParam

DialogBoxParam

Reference

SetFocus

WM_INITDIALOG