Hello @229 ho,
You can report the issue at https://github.com/microsoft/Windows-classic-samples/issues.
CF_CALLBACK_TYPE_NOTIFY_DEHYDRATE and CF_CALLBACK_TYPE_NOTIFY_DEHYDRATE_COMPLETION are also not invoked in the Cloud Mirror Sample for me.
When will `CF_CALLBACK_TYPE_NOTIFY_DEHYDRATE` be invoked
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 12%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3E2H%3C/text%3E%3C/svg%3E)
229 ho
20
Reputation points
When the user clicks Free up space in the Explorer menu, CF_CALLBACK_TYPE_NOTIFY_DEHYDRATE and CF_CALLBACK_TYPE_NOTIFY_DEHYDRATE_COMPLETION are not invoked.
In the Cloud Mirror Sample, it uses ReadDirectoryChangesW and checks FILE_ATTRIBUTE_UNPINNED flag to detect if the placeholder is dehydrated by the user, then call a preview API CfDehydratePlaceholder for unknown reasons.
Windows development | Windows API - Win32
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(179.20000000000002, 34%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXY%3C/text%3E%3C/svg%3E)
Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff2024-06-12T02:09:06.78+00:00 -
229 ho 20 Reputation points
2024-06-15T12:00:38.7666667+00:00 I open an issue for this question, but I think this is a matter of
cfapiinstead ofCloud Mirror Sample -
Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff
2024-06-18T05:41:11.1+00:00 Yes, It's an issue of
cfapi. You can also report it by feedback hub.
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