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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)".

pLUT

Pointer to the look-up table, which will be filled by the dialog.

uLUTLength

Length of the look-up table.

uLowBit

Value indicating the low bit used for leveling.

uHighBit

Value indicating the high bit used for leveling.

nLow

Variable to be updated with the low value entered through the dialog.

nHigh

Variable to be updated with the high value entered through the dialog.

crStart

Variable to be updated with the starting color value entered through the dialog.

crEnd

Variable to be updated with the ending color value entered through the dialog.

nFactor

Value that indicates the factor to be applied in the function operation specified in the uWindowLevelFlags parameter. This parameter is used only if uWindowLevelFlags is FILLLUT_EXPONENTIAL, FILLLUT_LOGARITHMIC or FILLLUT_SIGMOID. If FILLLUT_EXPONENTIAL or FILLLUT_SIGMOID flag is selected its value range from 1000 to -1000. If FILLLUT_LOGARITHMIC flag is selected its value range form 0 to 1000. If nFactor = 0, the lookup table will be filled linearly.

uWindowLevelFlags

Flags that indicate how the range is used to fill the LUT and the type of LUT.

The following flags indicate how the range is used to fill the LUT:

Value

Meaning

FILLLUT_INSIDE

[0x0001] Fill the LUT between nLow and nHigh. ( inside the nLow...nHigh range )

FILLLUT_OUTSIDE

[0x0002] Fill the LUT below nLow and above nHigh. ( outside the nLow...nHigh range )

The following flags indicate the LUT type:

Value

Meaning

FILLLUT_LINEAR

[0x0010] LUT is linear.

FILLLUT_EXPONENTIAL

[0x0020] LUT is exponential.

FILLLUT_LOGARITHMIC

[0x0030] LUT is logarithmic.

FILLLUT_SIGMOID

[0x0040] LUT is sigmoid.

uDlgFlags

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

Value

Meaning

DLG_WINDOWLEVEL_AUTOPROCESS

[0x00000001] process the image on OK. You should pass a valid bitmap in the pBitmap field of this structure.

DLG_WINDOWLEVEL_SHOW_CONTEXTHELP

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

DLG_WINDOWLEVEL_SHOW_PREVIEW

[0x00000004] show preview of the image in the dialog. You should pass a valid bitmap in the pBitmap field of this structure.

DLG_WINDOWLEVEL_SHOW_TOOL_ZOOMLEVEL

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

DLG_WINDOWLEVEL_SHOW_RANGE

[0x00000010] show the Range combo in the dialog.

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 *. 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.