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How to Refresh Windows Explorer Items using SHChangeNotify

Posted on 2012-03-20
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Last Modified: 2012-04-01
I have the path of a folder, I need to refresh that folder to display the new icon on it.

In the below API, I tried different combinations of parameters, but it seems not working:

SHChangeNotify(SHCNE_UPDATEIMAGE |SHCNE_RENAMEITEM | SHCNE_MKDIR,0, 0, "C:\Watch\Test);
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Question by:HPFE455
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LVL 35

Assisted Solution

by:sarabande
sarabande earned 2000 total points
ID: 37748703
the SHCNE_UPDATEIMAGE would work if you changed an item in the system image list.

then the call would be

SHChangeNotify(SHCNE_UPDATEIMAGE, SHCNF_DWORD, 0, idx);

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the SHCNF_DWORD tells that the input is a DWORD (unsigned integer) and idx is the index of the image which had changed.

Sara
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Author Comment

by:HPFE455
ID: 37755239
thanks Sara, I will try your solution tomorrow.
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Author Comment

by:HPFE455
ID: 37757064
How shell will know which folder icon need to be changed. I am maintaining a list of folders /Files and that need to be refreshed, so  the updated icon will be displayed.

 The below code is not updating the folde icon.
SHChangeNotify(SHCNE_UPDATEIMAGE, SHCNF_DWORD, 0, idx);
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LVL 35

Accepted Solution

by:
sarabande earned 2000 total points
ID: 37760428
can you show the code where you changed the system image list?

the Explorer would refresh all files and folders - similar to response on f5 - and would have exchanged the image identified by idx in the cache.

Sara
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Assisted Solution

by:HPFE455
HPFE455 earned 0 total points
ID: 37767479
Sara,
 I am using QT for my development.

refresh( const QString systemPath)
{

//wchar_t* systemPath = L"C:\\Users\\guest\\Desktop\\Test";
systemPath = L"C:\\Users\\guest\\Desktop\\Test";

    IShellFolder *psfParent = NULL; 
    LPITEMIDLIST pidlSystem = NULL; 
    HRESULT hr; 

  hr = SHGetDesktopFolder(&psfParent);

if (SUCCEEDED(hr)) 
{
hr =psfParent->ParseDisplayName(NULL,NULL, systemPath ,0, &pidlSystem,NULL);
SHChangeNotify(SHCNE_UPDATEDIR, SHCNF_IDLIST, pidlSystem, 0);
}

}

Open in new window


The above code seems working while using Visual Studio 2010. But the same code is giving compilation for the below line

hr =psfParent->ParseDisplayName(NULL,NULL, systemPath ,0, &pidlSystem,NULL);
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Assisted Solution

by:HPFE455
HPFE455 earned 0 total points
ID: 37768549
sara,
 I have changed my code   and it worked.

hr =psfParent->ParseDisplayName(NULL,NULL, (LPOLESTR)path.utf16(),0, &pidlSystem,NULL);


Thanks for you help,  I will be accepting your solution after my testing
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LVL 35

Expert Comment

by:sarabande
ID: 37769976
the QString::utf16 returns const ushort* what is equivalent to const wchar_t * or LPCWSTR (long pointer to "wide" unicode string). unfortunately the third argument of ParseDisplayName is a non-const LPWSTR (or LPOLESTR) though documented as [in] what means read-only. therefore the cast you made which casts from const to non-const is ok.

a solution without cast is like

wchar_t wszbuf[MAX_PATH+1];
wcscpy(wszbuf, path.utf16());
hr =psfParent->ParseDisplayName(NULL,NULL,wszbuf,0, &pidlSystem,NULL); 

Open in new window


Sara
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Author Closing Comment

by:HPFE455
ID: 37792667
I have updated my code  after sara's comments and it helped me to resolve the issue
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