[Tip] Selecting iCon

 

IconDialog_exe_1.zip

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IconDialog_proj_1.zip

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Introduction

The introduction of this article was: "Once developing a wizard application I needed a dialog to select an icon from executables, but did not find anything about icon selection in MSDN. So I have searched the CodeProject and found two articles on icon selection. The first solution, by PJ Naughter (article CIconDialog - Icon Selection Dialog), uses CDialog derived class with template dialog resource to display icon selection dialog and handle its behavior, and the second, by Henk Devos (article How to display the Pick Icon Dialog), uses undocumented Windows API functions to show the system built-in icon selection dialog. I prefer to use the Windows API even if undocumented to dragging resources around, and so wrote a small class that wraps the APIs published by Henk Devos.".

But this is the 21-st centuary now and even undocumented functions become documented. So finally Microsoft included the function name we imported by ordinal 62 in the shell32.dll 5.0 exports. Its name is PickIconDlg and only UNICODE version is available starting with Windows 2000. But for the compatibility we should import it by ordinal to use under Windows NT4.0, Windows 95/98 and Me and for using the ANSI version under Windows 2000 or later.

Sample Usage

The CIconDialog is derived from CCommonDialog and acts like any common dialog. See sample usage:

Collapse | Copy Code

//
#ifndef __ICONDLG_H__
    #include "IconDialog.h"
#endif
//...
void CSomeDialog::OnSomeBtnClicked( void ) 
{
    // If icon container file is not specified in the parameter
    // then by default it will open Shell32.dll file:
    // CIconDialog dlg( NULL, 0, this );
    //
    // You can specify any initial file name and icon index ( if exist ).
    // In this case it will open index + 1 icon
     // ( index is 0 - based ) selected:  
    
    CIconDialog dlg( _T( "%SystemRoot%\\system32\\SHELL32.dll" ), 
        148, this );

    if( dlg.DoModal() == IDOK  )
    {
        HICON hIcon = dlg.GetIconHandle();
        SetIcon( hIcon, FALSE );
    
        // Or:
        // HICON hIcon = ::ExtractIcon( AfxGetInstanceHandle(), 
        //          dlg.GetIconFile(), dlg.GetIconIndex() );
    }
    
}
//...

See demo project source for more.

Class Members

Base Class

• CCommonDialog

Data Members

• m_szIconFile - Specifies the icon file name.
• m_dwIconIndex - Specifies icon index.
• m_hIconHandle - Contains icon handle (last open).
• m_uIconCount - Icon count in a file.

Construction

Constructs a CIconDialog object.

CIconDialog(LPCTSTR lpszIconFile = NULL, DWORD dwIconIndex = 0, CWnd* pParentWnd = NULL)

• lpszIconFile - The initial icon library whose icons should be open in the dialog.
• dwIconIndex - The icon index initially selected when the dialog opens.
• pParentWnd - A pointer to the file dialog-box object's parent or owner window.

Operations

• DoModal( void )- Displays the dialog box and allows the user to make a selection.
• GetIconHandle( void ) const - Returns the handle of the last selected icon.
• GetIconCount( void ) const - Returns the icon count of the selected icon file.
• GetIconIndex( void ) const - Returns the index of the selected icon.
• GetIconFile( void ) const - Returns the full path of the selected icon file.

Notes

This class compiles without any warning at level 4, and fully supports both ANSI and UNICODE.

Version Requirements

Finally Microsoft included support for the API function this class uses in the shell32.dll 5.0 or later. So we have no problem of missing ordinal using this class under:

• Windows 2000 Pro/Server - NT 5.0.2195 with/out SP1/SP2/SP3/SP4
• Windows XP Professional - NT 5.1.2600 with/out SP1
• Windows 2003 Server - NT 5.2 - Standard/Enterprise/Datacenter/Web Edition

While importing by ordinal, this class was tested and ran properly under:

• Windows 95 OSR2 - 4.00.950B
• Windows 98 - 4.10.1998
• Windows 98 SE - 4.10.2222A ( Second Edition )
• Windows Me - 4.90.3000
• Windows NT 4.0 Workstation - NT 4.0.1381 with SP 6i

It was not tested (though expected to run properly) under:

• Windows 95 - 4.00.950
• Windows 95 SP1 - 4.00.950A
• Windows 95 OSR 2.5 - 4.00.950C
• Windows NT 4.0 Workstation - NT 4.0.1381 with SP1-SP5
• Windows NT 4.0 Server -NT 4.0.1381 with SP1-SP6i

If anyone tested it on above-mentioned versions of Windows, please post a reply.