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Fix registration of Windows-specific custom mime types

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Data received by Qt from a native clipboard- or drag'n'drop-source is
mapped to a application/x-qt-windows-mime;value=... mime type, where the
"value" corresponds to the native clipboard format name, e.g.
"FileGroupDescriptor". When we register such a mime type in Qt, then we
need to get the same clipboard format number back. I.e. registering
'application/x-qt-windows-mime;value="FileGroupDescriptor"' needs to
produce the same Windows clipboard format identifier as the call to
RegisterClipboardFormat("FileGroupDescriptor").

Otherwise, a mime converter implementation has to operate on different
clipboard format values in the implementations of the different virtual
functions that are operating on FORMATETC data structures.

Task-number: QTBUG-93632
Change-Id: I0b7e3a2fc0e3f72bffc4490fc0ff4b190e0929a3
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
This commit is contained in:
Volker Hilsheimer 2022-11-01 13:58:11 +01:00
parent c9ad5ad3b7
commit 68f097923f
1 changed files with 9 additions and 3 deletions
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12
src/plugins/platforms/windows/qwindowsmimeregistry.cpp
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@ -1496,12 +1496,18 @@ void QWindowsMimeRegistry::registerMime(QWindowsMime *mime)
/*! /*!
Registers the MIME type \a mime, and returns an ID number Registers the MIME type \a mime, and returns an ID number
identifying the format on Windows. identifying the format on Windows.
A mime type \c {application/x-qt-windows-mime;value="WindowsType"} will be
registered as the clipboard format for \c WindowsType.
*/ */
int QWindowsMimeRegistry::registerMimeType(const QString &mime) int QWindowsMimeRegistry::registerMimeType(const QString &mime)
{ {
const UINT f = RegisterClipboardFormat(reinterpret_cast<const wchar_t *> (mime.utf16())); const QString mimeType = isCustomMimeType(mime) ? customMimeType(mime) : mime;
if (!f) const UINT f = RegisterClipboardFormat(reinterpret_cast<const wchar_t *> (mimeType.utf16()));
qErrnoWarning("QWindowsApplication::registerMimeType: Failed to register clipboard format"); if (!f) {
qErrnoWarning("QWindowsMimeRegistry::registerMimeType: Failed to register clipboard format "
"for %s", qPrintable(mime));
}
return int(f); return int(f);
} }