LDialogColor::DoModalContrast

#include "ltwrappr.h"

virtual L_INT LDialogColor::DoModalContrast(hWndOwner)

HWND hWndOwner;

handle of the window which owns the dialog

Displays the Contrast dialog box, and gets the options for LBitmap::ChangeContrast

Parameter	Description
hWndOwner	Handle of the window which owns the dialog.

Returns

SUCCESS_DLG_OK	The "OK" button was pressed, and the dialog exited successfully.
SUCCESS_DLG_CANCEL	The "Cancel" button was pressed, and the dialog exited successfully.
< 1	An error occurred. Refer to Return Codes.

Comments

LDialogColor::SetContrastParams must be called before using this function to set the initial values for the dialog. You can get the updated CONTRASTDLGPARAMS with the values entered by the user through the dialog by using LDialogColor::GetContrastParams.

The Contrast dialog.

Required DLLs and Libraries

LTDLGCLR
LTDLGKRN
LTDLGUTL
LTDLGCTRL
LTDLGCOM
LTDIS
LTIMGUTL
LTIMGCLR

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application

Example

L_INT LDialogColor_DoModalContrastExample(LBitmap * pBitmap, HWND hWnd) 
{ 
   L_INT nRet; 
   LDialogColor DlgColor; 
   nRet = DlgColor.Initialize (DLG_INIT_COLOR ); 
   if(nRet != SUCCESS) 
      return nRet; 
   DlgColor.SetBitmap(pBitmap); 
   CONTRASTDLGPARAMS DlgParams; 
   memset ( &DlgParams, 0, sizeof ( CONTRASTDLGPARAMS ) ) ; 
   DlgParams.uStructSize      = sizeof ( CONTRASTDLGPARAMS ) ; 
   DlgColor.EnableCallBack (FALSE); 
   DlgColor.EnablePreview(TRUE); 
   DlgColor.EnableAutoProcess(TRUE); 
   DlgColor.EnableToolbar(TRUE); 
   nRet = DlgColor.SetContrastParams(&DlgParams) ; 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = DlgColor.DoModalContrast(hWnd); 
   if(nRet < 1) 
      return nRet; 
   // Gets the updated values for the structure 
   nRet = DlgColor.GetContrastParams(&DlgParams, sizeof(DlgParams)) ; 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = DlgColor.Free(); 
   if(nRet != SUCCESS) 
      return nRet; 
   return nRet; 
}

Help Version 19.0.2017.10.27

Functions:	LDialogBase::Initialize, LBitmap::ChangeContrast
Topics:	Using Imaging Common Dialog