Member

Description

uStructSize

Size of this structure, in bytes. Use the sizeof operator to calculate this value.

pBitmap

Pointer to the bitmap handle that references the bitmap used for preview or processing.

bZoomToFit

Flag that indicates the initial zoom level for previewing the image. Possible values are:

Value

Meaning

TRUE

Set the initial zoom level to "Zoom to fit".

FALSE

Set the initial zoom level to "Normal (1:1)".

pFilter

Address of a variable to be updated with the spatial filter selected in the dialog. Laplacian filters apply Laplacian line detection. There are three omnidirectional filters and three bi-directional ones. All pixels not on the detected lines are changed to black. Possible values are:

Value

FLT_LAPLACE_1

FLT_LAPLACE_2

FLT_LAPLACE_3

FLT_LAPLACE_DIAG

FLT_LAPLACE_HORZ

FLT_LAPLACE_VERT

uDlgFlags

User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:

Value

Meaning

DLG_LAPLACIANFILTER_AUTOPROCESS

[0x00000001] process the image on OK. The pBitmap member of this structure should contain a valid bitmap.

DLG_LAPLACIANFILTER_SHOW_CONTEXTHELP

[0x00000002] dialog should contain a context sensitive help icon.

DLG_LAPLACIANFILTER_SHOW_PREVIEW

[0x00000004] show a preview of the image in the dialog. The pBitmap member of this structure should contain a valid bitmap.

DLG_LAPLACIANFILTER_SHOW_TOOL_ZOOMLEVEL

[0x00000008] show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The DLG_LAPLACIANFILTER_SHOW_PREVIEW flag must be set in order to show these buttons.

pfnHelpCallback

Pointer to an optional help callback function. If you do not wish to provide help to this dialog, use NULL as the value of this parameter. To provide help to this dialog, use the function pointer as the value of this parameter. The callback function must adhere to the prototype described in LTCOMMDLGHELPCB.

pHelpCallBackUserData

Void pointer that you can use to pass one or more additional parameters that the callback function needs. To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID L_FAR *. The callback function, which receives the address in its own pHelpCallBackUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.