gecko-dev/mozglue/misc/GetKnownFolderPath.cpp
Doug Thayer b5f7314e3e Bug 1714212 - Ensure COM initialized prior to showing skeleton UI r=Jamie,aklotz,tkikuchi
This implements Jamie's suggested fixes for a screenreader issue when the
skeleton UI is enabled. Most of the work here is just pulling out pieces from the
files we needed to include in mozglue so that any references to, say, nsString
or other pieces from libxul either no longer exist or are only included when
building libxul. In a few cases this meant creating whole files to house single
functions, which isn't so pretty, but it was the best I could come up with to
get the job done.

Differential Revision: https://phabricator.services.mozilla.com/D117663
2021-07-07 22:37:14 +00:00

34 lines
1.2 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GetKnownFolderPath.h"
namespace mozilla {
UniquePtr<wchar_t, LoadedCoTaskMemFreeDeleter> GetKnownFolderPath(
REFKNOWNFOLDERID folderId) {
static decltype(SHGetKnownFolderPath)* shGetKnownFolderPath = nullptr;
if (!shGetKnownFolderPath) {
// We could go out of our way to `FreeLibrary` on this, decrementing its
// ref count and potentially unloading it. However doing so would be either
// effectively a no-op, or counterproductive. Just let it get cleaned up
// when the process is terminated, because we're going to load it anyway
// elsewhere.
HMODULE shell32Dll = ::LoadLibraryW(L"shell32");
if (!shell32Dll) {
return nullptr;
}
shGetKnownFolderPath = reinterpret_cast<decltype(shGetKnownFolderPath)>(
::GetProcAddress(shell32Dll, "SHGetKnownFolderPath"));
if (!shGetKnownFolderPath) {
return nullptr;
}
}
PWSTR path = nullptr;
shGetKnownFolderPath(folderId, 0, nullptr, &path);
return UniquePtr<wchar_t, LoadedCoTaskMemFreeDeleter>(path);
}
} // namespace mozilla