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Posted 28 Dec 1999


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Standard file open dialog with preview

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28 Dec 1999
This article describes a completely object oriented standard file open dialog with preview.


There is no custom hook function, just common MFC message maps. The dialog has a CDibStatic member, which displays the preview image when available. The CDibStatic class encapsulates a static control that displays images and is described in an article in the static controls section.

This is how the dialog looks like:

Image 1

The template for the dialog is a normal developer studio dialog template. Note however, the use of the stc32 static control. As it hasn't any text in it, it is invisible unless you select it. This static control will serve as a place holder for the standard file dialog controls, thus establishing the position of the newly added controls in respect to the standards. If there is no stc32 control specified in the template, all the new controls will be placed below the standard controls. Otherwise, the common file dialog will look at the size of the stc32 control to attempt to fit all the standard controls in it. If it is not big enough, it is resized to make room for the standard controls, and then the new controls are repositioned with respect to the resized stc32 control.

Palette support is included within the dialog class. It is implemented using handlers for the WM_QUERYNEWPALETTE and WM_PALETTECHANGED Windows messages, so you have to ensure in your program that the dialog receives these messages. If the palette never changes, the image is painted with the right palette selected the first time. Since the standard dialogs are modal, the palette changes can be due only to other applications (unless you change it in another thread), thus realizing palette when gaining focus should always maintain the right colors. You can realize the palette at any time you wish by sending a WM_QUERYNEWPALETTE message to the CDibStatic control, for instance.

This class has been used (among other things) to implement a completely object oriented DIBLOOK.


This article has no explicit license attached to it, but may contain usage terms in the article text or the download files themselves. If in doubt, please contact the author via the discussion board below.

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Comments and Discussions

GeneralNeed help on setting this Dialog Pin
jocblack19-Oct-06 10:15
jocblack19-Oct-06 10:15 
Generaluse dll in c# Pin
giugio26-Apr-03 2:29
giugio26-Apr-03 2:29 
GeneralGood One...But no preview for first time!!! Pin
paytapatya25-Jul-02 1:22
paytapatya25-Jul-02 1:22 
GeneralDoubts on VC++ DhtmlEdit Controll for IE5[Table insert,Paste html...] Pin
Ranjith.e.Nair15-Jul-02 23:09
Ranjith.e.Nair15-Jul-02 23:09 
GeneralDoubts on VC++ DhtmlEdit Controll for IE5[Table insert,Paste html...] Pin
Ranjith.e.Nair15-Jul-02 23:08
Ranjith.e.Nair15-Jul-02 23:08 
QuestionHow can i use it in a extension dll ? Pin
10-Jan-02 19:48
suss10-Jan-02 19:48 
ye, greate work. i work fine in my project. but now i want to use it in a microsoft extension dll, VC++ always return can not find resource error code.

How can i do ?Blush | :O
Questionhow to use palette Pin
2-Jan-02 23:05
suss2-Jan-02 23:05 
AnswerRe: how to use palette Pin
mvsk417-Jun-12 23:53
mvsk417-Jun-12 23:53 
GeneralElegant Pin
Member 450117-Jun-00 21:28
Member 450117-Jun-00 21:28 

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