DDXFolder & CChooseDirDlg v1.36 A freeware control for selecting a Directory/Folder

For developers who use MFC this is a control which subclasses an edit control to allow you to easily specify a folder. When the edit control is correctly setup it will look like:

The button beside the edit control sports a tooltip when the button is over it and when the button is hit, the following dialog is displayed:

In addition the control integrates with the AutoCompletion functionality of Windows, so that a drop down list appears underneath the edit control which allows the user to quickly select a specific folder. The code is most useful when you want to specify a folder from somewhere in the user interface such as specifying a directory where a bunch of output files will be placed.

The enclosed zip file contains source for the routine and also includes a VC 6 project file to build a small dialog based app to demonstrate the routine.

Copyright

• You are allowed to include the source code in any product (commercial, shareware, freeware or otherwise) when your product is released in binary form.
• You are allowed to modify the source code in any way you want except you cannot modify the copyright details at the top of each module.
• If you want to distribute source code with your application, then you are only allowed to distribute versions released by the author. This is to maintain a single distribution point for the source code.

Updates

v1.1 (26 November 1997)

• Used internally by ddxgetfolder is another class which you may find helpful. It's name is CChooseDirDlg which implements a standalone directory picker dialog which can be used independently of the DDX/DDV functions.

v1.2 (16 September 1998)

• Updated all the documentation to be HTML based as with my other shareware / freeware.
• Unicode enabled all the code and provision of Unicode build configurations.
• VC 5 workspace files provided now as standard
• Provision of a DDV function.
• General tidy up of the sample app including removing all the AppWizard generated comments.
• All code now compiles cleanly at warning level 4.
• Replaced all TRACE0 calls with TRACE.
• Changed name of main function from DDX_GetFolder to DDX_FolderControl.
• Module name has been changed from ddxgetfolder to ddxfolder.
• Sample app now allows read only state of widget to be toggled.
• Addition of a DDX_FolderValue function.
• Change the ID's of the strings in the resource table which the code uses.

v1.21 (17 September 1998)

• Minor update to some code comments and the online documentation.

v1.22 (30 September 1998)

• Fixed a compiler problem in the rc file. I was accidentally shipping the wrong resource.h file.

7 February 1999

• Minor bug fix in choosedirdlg.cpp.

v1.23 (3rd April 1999)

• Fixed another resource compiler problem.
• Updated the copyright messages.
• General code tidy up.

v1.24 (11 December 1999)

• Cosmetic item where now a 1 pixel space is included between the edit control and the "..." button.

v1.25 (14 May 2000)

• The "..." button now supports being tabbed into i.e. the WS_TABSTOP style

v1.26 (17 May 2000)

• The width of the underlying edit control is now shrunk when the "..." button is created. This makes layout of the control using the resource designer a lot simpler.

v1.27 (18 July 2000)

• Removed an unreferenced variable from the demo app module "testgetfolderDlg.cpp"
• Width of the edit button is now determined from the text which it displays.

v1.28 (24 May 2001)

• Fixed a problem with the Z-Order of the control being set incorrectly.
• Updated copyright message.

v1.29 (9 January 2003)

• Updated copyright details.
• Changed a class name from "CModifyButton" to the better named "CDDXFileModifyButton".
• Enabled state of control is now reflected to buddy button edit control. Thanks to "matro" for pointing out this problem.
• Made the "CGetFolderControl::Edit" virtual for easier customisation.
• Made all strings used by the classes easier to modify by making them virtual methods of the class
• Made the "CGetFolderControl::AddEditButton" method virtual for easier customisation.

v1.30 (19 July 2006)

• Updated copyright details.
• Updated documentation to use the same style as the web site.
• Addition of a CCHOOSEDIRDLG_EXT_CLASS preprocessor macro to allow the code to be easily added to an extension dll.
• Addition of a CDDXFOLDER_EXT_CLASS preprocessor macro to allow the code to be easily added to an extension dll.
• Optimized CDDXFolderModifyButton constructor code
• Removed support for the old style directory picker dialog which used a modified version of the File Open dialog.
• Changed the names of the constants used for DDV_FolderControl
• Added support for a DDXGETFOLDER_FOLDERMUSTEXIST flag
• Removed the GetFolder and SetFolder methods as they are not really required
• Verified code clean compiles in VC2005

v1.31 (29 July 2006)

• Initial enabled state of the edit control is now reflected into the edit button when AddEditButton is called.

v1.32 (11 August 2006)

• Reworked all the use of string resources. Now all the string resources used by the control are all loaded in one single virtual function. In addition if you do not want to use inheritance, all the strings can be customized via Get/Set methods.
• Broke the DDV functionality into seperate discreet DDV functions
• The dialog control id of the edit button can now be specified via the SubclassEdit and DDX_FilenameControl functions

v1.33 (19 August 2006)

• Control now takes advantage of the AutoCompletion functionality (IAutoComplete et al) built into Windows to improve the UI experience. If enabled then a drop down list will appear underneath the edit control which allows the user to quickly select a specific folder. The code uses the COM interfaces (IAutoComplete) to AutoCompletion instead of the more simplified functionality provided by SHAutoComplete. This allows the code to customize the auto completion UI so that only file system folders are selectable.

v1.34 (25 August 2006)

• Minor update to the name of one of the string resources used by DDXFolder

v1.35 (19 November 2007)

• Minor update to display HRESULT's correctly.
• Minor tidy up to remove old style AppWizard comments

v1.36 (21 November 2007)

• The code now uses the value 32 instead of the enum ACLO_FILESYSDIRS in the call to IID_IACList2::SetOptions. This is because newer versions of the Windows SDK make this value dependent on the setting of the _WIN32_IE preprocessor macros. Thanks to Alexey Kuznetsov for reporting this issue.