PropSheetProc


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PropSheetProc
int CALLBACK PropSheetProc(
    HWND hwndDlg,
    UINT uMsg,
    LPARAM lParam
);		
An application-defined callback function that the system calls when the property sheet is being created and initialized.
Returns zero.

hwndDlg
Handle to the property sheet dialog box.
uMsg
Message being received. This parameter is one of the following values:

PSCB_INITIALIZED Indicates that the property sheet is being initialized. The lParam value is zero for this message.
PSCB_PRECREATE Indicates that the property sheet is about to be created. The hwndDlg parameter is NULL, and the lParam parameter is the address of a dialog template in memory. This template is in the form of a DLGTEMPLATE structure followed by one or more DLGITEMTEMPLATE structures.

lParam
Additional information about the message. The meaning of this value depends on the uMsg parameter.

To enable a PropSheetProc callback function, use the PROPSHEETHEADER structure when you call the PropertySheet function to create the property sheet. Use the pfnCallback member to specify an address of the callback function, and set the PSP_USECALLBACK flag in the dwFlags member.
PropSheetProc is a placeholder for the application-defined function name. The PFNPROPSHEETCALLBACK type is the address of a PropSheetProc callback function.

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PSCB_INITIALIZED	Indicates that the property sheet is being initialized. The lParam value is zero for this message.
PSCB_PRECREATE	Indicates that the property sheet is about to be created. The hwndDlg parameter is NULL, and the lParam parameter is the address of a dialog template in memory. This template is in the form of a DLGTEMPLATE structure followed by one or more DLGITEMTEMPLATE structures.