HELPMSGSTRING

A common dialog box sends the HELPMSGSTRING registered message to the window procedure of its owner window when the user clicks the Help button.

For Explorer-style Open and Save As dialog boxes, this message has been superseded by the CDN_HELP notification message.

MessageID = RegisterWindowMessage(HELPMSGSTRING);
hdlg = (HWND) wParam; 
lpStruct = (LPVOID) lParam; 
 

Parameters

hdlg

Handle of the common dialog box.

lpStruct

Pointer to the initialization structure for the common dialog box. This structure can be a CHOOSECOLOR, CHOOSEFONT, FINDREPLACE, OPENFILENAME, PRINTDLG or PAGESETUPDLG structure.

Return Values

No return value.

Remarks

You must specify the HELPMSGSTRING constant in a call to the RegisterWindowMessage function to get the identifier for the message sent by the dialog box.

When you create the dialog box, use the hwndOwner member of the initialization structure to identify the window to receive HELPMSGSTRING messages.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in commdlg.h.
  Unicode: Defined as Unicode and ANSI messages.

See Also

Common Dialog Box Library Overview, Common Dialog Box Messages, CDN_HELP, CHOOSECOLOR, CHOOSEFONT, FINDREPLACE, OPENFILENAME, PRINTDLG, PAGESETUPDLG, RegisterWindowMessage