Sets a callback function that is called just before rendering the image.


#include "ltivw.h"

L_LTIVW_API L_INT L_DispContainerSetPaintImageCallBack(hCellWnd, pfnCallBack, pUserData);


L_HWND hCellWnd

A handle to the window that represents the Medical Viewer Cell.


Callback function that is called after painting the cell.
The callback function must adhere to the function prototype described in DISPCONTAINERPOSTPAINTCALLBACK.

LPVOID pUserData

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 pUserData 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.


Value Meaning
SUCCESS The function was successful.
1 An error occurred. Refer to Return Codes.


To get the post-paint callback, use L_DispContainerGetPostPaintCallBack.

To set the post-paint callback, use L_DispContainerSetPostPaintCallBack.

To get the pre-paint callback, use L_DispContainerGetPrePaintCallBack.

To set the pre-paint callback, use L_DispContainerSetPrePaintCallBack.

Required DLLs and Libraries

See Also




This function sets the paint image callback.

L_INT EXT_CALLBACK PaintImage  (L_HWND     hCellWnd, 
                                 pDISPCONTAINERCELLINFO pCellInfo, 
                                 L_VOID *               ) 
   HDC hDC = pCellInfo->hDC; 
   static LOGFONT lf = {0}; 
   lf.lfHeight = -12; 
   lf.lfQuality = ANTIALIASED_QUALITY; 
   wsprintf(lf.lfFaceName, TEXT("Arial\0")); 
   FillRect(hDC, &(pCellInfo->rcBitmapRect), GetStockBrush(BLACK_BRUSH)); 
   HFONT hFont = CreateFontIndirect(&lf); 
   HFONT hPrevFont = (HFONT)SelectObject(hDC, hFont); 
   SetTextColor(hDC, RGB(255, 255, 0)); 
   DrawText(hDC, TEXT("Custom Image"), 30, &(pCellInfo->rcBitmapRect), DT_LEFT | DT_VCENTER | DT_SINGLELINE); 
   Rectangle(hDC, pCellInfo->rcBitmapRect.left, pCellInfo->rcBitmapRect.top, pCellInfo->rcBitmapRect.right, pCellInfo->rcBitmapRect.bottom); 
   return SUCCESS; 
L_INT L_DispContainerSetPaintImageCallBackExample(HWND hCellWnd) 
   L_DispContainerSetPaintImageCallBack(hCellWnd, PaintImage, NULL); 
   return SUCCESS; 

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LEADTOOLS Medical Image Viewer C API Help

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.