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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user-defined
| Header File
| commdlg.h
| Unicode
| No
| Platform Notes
| LPPRINTHOOKPROC
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PrintHookProc
A PrintHookProc hook procedure is an application-defined or library-defined callback
procedure that is used with the Print common dialog box. The hook procedure receives
messages or notifications intended for the default dialog box procedure.
UINT APIENTRY PrintHookProc(
HWND hdlg,
| // handle to the dialog box window
| UINT uiMsg,
| // message identifier
| WPARAM wParam,
| // message parameter
| LPARAM lParam
| // message parameter
| );
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Parameters
hdlg
Handle to the Print common dialog box window for which the message is
intended.
uiMsg
Identifies the message being received.
wParam
Specifies additional information about the message. The exact meaning depends
on the value of the uiMsg parameter.
lParam
Specifies additional information about the message. The exact meaning depends
on the value of the uiMsg parameter.
If the uiMsg parameter indicates the WM_INITDIALOG message, lParam is a pointer to a PRINTDLG structure containing the values specified when the common dialog box was
created.
Return Values
If the hook procedure returns zero, the default dialog box procedure processes
the message.
If the hook procedure returns a nonzero value, the default dialog box
procedure ignores the message.
Remarks
When you use the PrintDlg function to create a Print common dialog box, you can provide a PrintHookProc hook procedure to process messages or notifications intended for the dialog
box procedure. To enable the hook procedure, use the PRINTDLG structure that you passed to the dialog creation function. Specify the
address of the hook procedure in the lpfnPrintHook member and specify the PD_ENABLEPRINTHOOK flag in the Flags member.
The default dialog box procedure processes the WM_INITDIALOG message before
passing it to the hook procedure. For all other messages, the hook procedure
receives the message first. Then, the return value of the hook procedure determines
whether the default dialog procedure processes the message or ignores it.
If the hook procedure processes the WM_CTLCOLORDLG message, it must return a valid brush handle for painting the background of
the dialog box. In general, if the hook procedure processes any WM_CTLCOLOR*
message, it must return a valid brush handle for painting the background of the
specified control.
Do not call the EndDialog function from the hook procedure. Instead, the hook procedure can call the PostMessage function to post a WM_COMMAND message with the IDABORT value to the dialog
box procedure. Posting IDABORT closes the dialog box and causes the dialog box
function to return FALSE. If you need to know why the hook procedure closed the
dialog box, you must provide your own communication mechanism between the hook
procedure and your application.
You can subclass the standard controls of the common dialog box. However, the
common dialog box procedure may also subclass the controls. Because of this,
you should subclass controls when your hook procedure processes the WM_INITDIALOG
message. This ensures that your subclass procedure receives the
control-specific messages before the subclass procedure set by the dialog box procedure.
PrintHookProc is a placeholder for the application-defined or library-defined function
name. The LPPRINTHOOKPROC type is a pointer to a PrintHookProc hook procedure.
See Also
EndDialog, PostMessage, PrintDlg, PRINTDLG, WM_INITDIALOG, WM_CTLCOLORDLG
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