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CFileDialog changing default directory

Posted on 1998-07-22
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Last Modified: 2013-11-20
I have a class derived from CFileDialog. I have inserted a CComboBox at the bottom of the dialog. In the added combo box are a list of previously used directories for saving reading.
What I want to do is when somebody selects a directory on the ComboBox this will change the default directory in the CFileDialog to the one selected in the ComboBox.
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Question by:ernan
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14 Comments
 
LVL 8

Expert Comment

by:trestan
ID: 1319593
You can use SetCurrentDirectory function to the cuurrent directory to the one indicated in the ComboBox.
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Author Comment

by:ernan
ID: 1319594
Sorry I also would like the CFileDialog to refresh itself showing the path directory etc.
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Author Comment

by:ernan
ID: 1319595
Adjusted points to 175
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LVL 2

Expert Comment

by:jstolan
ID: 1319596
This is a little tricky.  The key is to fool the dialog into thinking that the user made the change himself.  When the user selects an item from your combo box, you should manually change the appropriate dialog box controls to match what you want.  You then send a message pretending to be from the control you just changed.

For example, if you modified an Edit Control you would send an EN_CHANGE message to the CFileDialog with the lParam set to the id and handle of the edit control.

I made this a comment because I don't think it's specific enough for an answer, but I hope it gets you on the write track.
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LVL 8

Expert Comment

by:trestan
ID: 1319597
Under your ON_EN_CHANGE function of the ComboBox, you should fill in the OPENFILENAME structure (the m_ofn data member of your CFileDialog instance). Then call the CFileDialog::OnFolderChange()function. This should renew the display the list box. Please try to see if there is any problem.
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Author Comment

by:ernan
ID: 1319598
Thanks trestan I tried what you said but it did not work, I am now picking up the changes from the combo box and making changes to the m_ofn structure, I tried then to call the OnFolderChange function but this does nothing, I even had a look at the source code for it, it just ASSERT(this), so I think that I may have to destroy and reinitialize the dialog at this stage.
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LVL 8

Expert Comment

by:trestan
ID: 1319599
If you close the dialog and open it again, definitely the content should be renewed. But it sounds a little stupid. Actually I think there is must a way to do it. I did not try it, but you can try to post a message WM_NOTIFY CDN_FOLDERCHANGE to the dialog window instead of call the function directely. You see, the default file dialog can change the content when you choose a different path. So it should be working in this way. Just try!
Good luck.
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LVL 8

Expert Comment

by:trestan
ID: 1319600
If you close the dialog and open it again, definitely the content should be renewed. But it sounds a little stupid. Actually I think there is must a way to do it. I did not try it, but you can try to post a message WM_NOTIFY CDN_FOLDERCHANGE to the dialog window instead of call the function directely. You see, the default file dialog can change the content when you choose a different path. So it should be working in this way. Just try!
Good luck.
0
 
LVL 8

Expert Comment

by:trestan
ID: 1319601
If you close the dialog and open it again, definitely the content should be renewed. But it sounds a little stupid. Actually I think there is must a way to do it. I did not try it, but you can try to post a message WM_NOTIFY CDN_FOLDERCHANGE to the dialog window instead of call the function directely. You see, the default file dialog can change the content when you choose a different path. So it should be working in this way. Just try!
Good luck.
0
 
LVL 8

Accepted Solution

by:
trestan earned 500 total points
ID: 1319602
Sorry for the repeated sending.
I send another suggestion after that. But I can not see it. I do not know what's wrong. I want to tell you that add this line in your program:
GetParent()->PostMessage( WM_NOTIFY,  CDN_FOLDERCHANGE, 0);
Please try to see if it works. If the message can be receive by the window, may be you do not need to fill the structure after you use SetCurrentDirectory.
0
 

Author Comment

by:ernan
ID: 1319603
Trestan I tried what you said but it crashed in COMCTRL32.dll
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LVL 8

Expert Comment

by:trestan
ID: 1319604
Which one you used? Use SetCurrentDirectory then send the message?
0
 

Expert Comment

by:NotJeff
ID: 1319605
I tried the above and it didn't work, it crashed.
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Expert Comment

by:NotJeff
ID: 1319606
I tried the above and it didn't work, it crashed.
0

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