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EXTPUSH structure (compstui.h)

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The EXTPUSH structure is used by CPSUI applications (including printer interface DLLs) for specifying an extended push button, which can be added to a property sheet page option. When the button is pushed, a new dialog can be displayed.

Syntax

typedef struct _EXTPUSH {
  WORD      cbSize;
  WORD      Flags;
  LPTSTR    pTitle;
  union {
    DLGPROC DlgProc;
    FARPROC pfnCallBack;
  } DUMMYUNIONNAME;
  ULONG_PTR IconID;
  union {
    WORD   DlgTemplateID;
    HANDLE hDlgTemplate;
  } DUMMYUNIONNAME2;
  ULONG_PTR dwReserved[3];
} EXTPUSH, *PEXTPUSH;

Members

cbSize

Size, in bytes, of the EXTPUSH structure.

Flags

Bit flags, which can be one of the following:

Flag Description
EPF_ICONID_AS_HICON If set, the IconID member contains an icon handle. If not set, the IconID member contains an icon resource identifier.
EPF_INCLUDE_SETUP_TITLE If set, CPSUI appends "Setup" to the string pointed to by pTitle.
EPF_NO_DOT_DOT_DOT If set, CPSUI does not append "..." to the string pointed to by pTitle.
EPF_OVERLAY_NO_ICON If set, CPSUI overlays its IDI_CPSUI_NO icon onto the icon identified by the IconID member.
EPF_OVERLAY_STOP_ICON If set, CPSUI overlays the IDI_CPSUI_STOP icon onto the icon identified by the IconID member.
EPF_OVERLAY_WARNING_ICON If set, CPSUI overlays its IDI_CPSUI_WARNING icon onto the icon identified by the IconID member.
EPF_PUSH_TYPE_DLGPROC If set, the DlgProc and DlgTemplateID/hDlgTemplate members are valid. If not set, the pfnCallBack member is valid.
EPF_USE_HDLGTEMPLATE If set, hDlgTemplate contains a template handle. If not set, DlgTemplateID contains a template resource identifier.

pTitle

String identifier, representing the push button title. This can be a 32-bit pointer to a NULL-terminated string, or it can be a 16-bit string resource identifier with HIWORD set to zero.

DUMMYUNIONNAME

Defines the DUMMYUNIONNAME union.

DUMMYUNIONNAME.DlgProc

DLGPROC-typed pointer to a dialog box procedure to process messages for the push button's dialog box. For more information on using DialogProc, see the Remarks section below.

If this pointer is supplied, EPF_PUSH_TYPE_DLGPROC must be set in Flags.

DUMMYUNIONNAME.pfnCallBack

Pointer to a _CPSUICALLBACK-typed callback function to handle the CPSUICB_REASON_PUSHBUTTON reason. For more information, see the following Remarks section.

If this pointer is supplied, EPF_PUSH_TYPE_DLGPROC must be cleared in Flags.

IconID

One of the following icon identifiers:

  • An icon resource identifier. This can be application-defined, or it can be one of the CPSUI-supplied, IDI_CPSUI-prefixed icon resource identifiers.

  • An icon handle. If a handle is specified, EPF_ICONID_AS_HICON must be set in the Flags member.

  • CPSUI displays the icon next to the push button. If this value is zero, an icon is not displayed.

DUMMYUNIONNAME2

Defines the DUMMYUNIONNAME2 union.

DUMMYUNIONNAME2.DlgTemplateID

Specifies the resource ID for the dialog box.

If DlgTemplateID = 0 then common UI will call DlgProc with following parameter:

DlgProc(hDlg, WM_USER, NULL, (LPARAM)pCPSUICBParam);

DUMMYUNIONNAME2.hDlgTemplate

Handle to the DLGTEMPLATE which will be used for a pop up dialog box.

dwReserved[3]

Reserved, must be initialized to zero.

Remarks

An extended push button is a CPSUI-defined type of push button that can be associated with an OPTITEM structure. An OPTITEM structure can have one extended push button or one extended check box associated with it.

When you use the EXTPUSH structure to create a push button, you can optionally create an additional dialog box that opens when the user clicks on the button. To create this dialog box, you should specify a pointer to a dialog box procedure in the DlgProc member, and include a dialog template specification in either the DlgTemplateID or the hDlgTemplate member.

If EPF_USE_HDLGTEMPLATE is set in Flags, CPSUI creates the dialog box by calling DialogBoxIndirectParam, passing the contents of the DlgProc and hDlgTemplate members.

If EPF_USE_HDLGTEMPLATE is not set in Flags, CPSUI creates the dialog box by calling DialogBoxParam, passing the contents of the DlgProc and DlgTemplateID members.

When the dialog box procedure is called with a uMsg value of WM_INITDIALOG, the lParam value is the address of a CPSUICBPARAM structure, with the Reason member set to CPSUICB_REASON_EXTPUSH. For more information about the uMsg and lParam parameters, see DialogProc.

If you do not need CPSUI to display a dialog box when the user clicks on the button, you can specify the address of a _CPSUICALLBACK-typed callback function in the pfnCallBack member. When a user clicks on the button, CPSUI calls the callback function. The accompanying CPSUICBPARAM structure's Reason member will be set to CPSUICB_REASON_EXTPUSH.

Requirements

Requirement Value
Header compstui.h (include Compstui.h)

See also

EXTCHKBOX