diff options
| -rw-r--r-- | src/plugins/platforms/windows/qwindowscontext.cpp | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp index a2dd25f8cc..d31352b854 100644 --- a/src/plugins/platforms/windows/qwindowscontext.cpp +++ b/src/plugins/platforms/windows/qwindowscontext.cpp @@ -604,15 +604,12 @@ QString QWindowsContext::registerWindowClass(QString cname, // each one has to have window class names with a unique name // The first instance gets the unmodified name; if the class // has already been registered by another instance of Qt then - // add a UUID. - static int classExists = -1; - + // add a UUID. The check needs to be performed for each name + // in case new message windows are added (QTBUG-81347). const auto appInstance = static_cast<HINSTANCE>(GetModuleHandle(nullptr)); - if (classExists == -1) { - WNDCLASS wcinfo; - classExists = GetClassInfo(appInstance, reinterpret_cast<LPCWSTR>(cname.utf16()), &wcinfo); - classExists = classExists && wcinfo.lpfnWndProc != proc; - } + WNDCLASS wcinfo; + const bool classExists = GetClassInfo(appInstance, reinterpret_cast<LPCWSTR>(cname.utf16()), &wcinfo) == TRUE + && wcinfo.lpfnWndProc != proc; if (classExists) cname += QUuid::createUuid().toString(); |