gecko-dev/xpcom/base/nsWindowsHelpers.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#ifndef nsWindowsHelpers_h
#define nsWindowsHelpers_h
#include <windows.h>
#include "nsAutoRef.h"
#include "nscore.h"
// ----------------------------------------------------------------------------
// Critical Section helper class
// ----------------------------------------------------------------------------
class AutoCriticalSection
{
public:
AutoCriticalSection(LPCRITICAL_SECTION aSection)
: mSection(aSection)
{
::EnterCriticalSection(mSection);
}
~AutoCriticalSection()
{
::LeaveCriticalSection(mSection);
}
private:
LPCRITICAL_SECTION mSection;
};
template<>
class nsAutoRefTraits<HKEY>
{
public:
typedef HKEY RawRef;
static HKEY Void()
{
return nullptr;
}
static void Release(RawRef aFD)
{
if (aFD != Void()) {
RegCloseKey(aFD);
}
}
};
template<>
class nsAutoRefTraits<SC_HANDLE>
{
public:
typedef SC_HANDLE RawRef;
static SC_HANDLE Void()
{
return nullptr;
}
static void Release(RawRef aFD)
{
if (aFD != Void()) {
CloseServiceHandle(aFD);
}
}
};
template<>
class nsSimpleRef<HANDLE>
{
protected:
typedef HANDLE RawRef;
nsSimpleRef() : mRawRef(nullptr)
{
}
nsSimpleRef(RawRef aRawRef) : mRawRef(aRawRef)
{
}
bool HaveResource() const
{
return mRawRef && mRawRef != INVALID_HANDLE_VALUE;
}
public:
RawRef get() const
{
return mRawRef;
}
static void Release(RawRef aRawRef)
{
if (aRawRef && aRawRef != INVALID_HANDLE_VALUE) {
CloseHandle(aRawRef);
}
}
RawRef mRawRef;
};
template<>
class nsAutoRefTraits<HMODULE>
{
public:
typedef HMODULE RawRef;
static RawRef Void()
{
return nullptr;
}
static void Release(RawRef aFD)
{
if (aFD != Void()) {
FreeLibrary(aFD);
}
}
};
typedef nsAutoRef<HKEY> nsAutoRegKey;
typedef nsAutoRef<SC_HANDLE> nsAutoServiceHandle;
typedef nsAutoRef<HANDLE> nsAutoHandle;
typedef nsAutoRef<HMODULE> nsModuleHandle;
namespace {
bool inline
IsRunningInWindowsMetro()
{
static bool alreadyChecked = false;
static bool isMetro = false;
if (alreadyChecked) {
return isMetro;
}
HMODULE user32DLL = LoadLibraryW(L"user32.dll");
if (!user32DLL) {
return false;
}
typedef BOOL (WINAPI* IsImmersiveProcessFunc)(HANDLE aProcess);
IsImmersiveProcessFunc IsImmersiveProcessPtr =
(IsImmersiveProcessFunc)GetProcAddress(user32DLL,
"IsImmersiveProcess");
FreeLibrary(user32DLL);
if (!IsImmersiveProcessPtr) {
// isMetro is already set to false.
alreadyChecked = true;
return false;
}
isMetro = IsImmersiveProcessPtr(GetCurrentProcess());
alreadyChecked = true;
return isMetro;
}
HMODULE inline
LoadLibrarySystem32(LPCWSTR aModule)
{
WCHAR systemPath[MAX_PATH + 1] = { L'\0' };
// If GetSystemPath fails we accept that we'll load the DLLs from the
// normal search path.
GetSystemDirectoryW(systemPath, MAX_PATH + 1);
size_t systemDirLen = wcslen(systemPath);
// Make the system directory path terminate with a slash
if (systemDirLen && systemPath[systemDirLen - 1] != L'\\') {
systemPath[systemDirLen] = L'\\';
++systemDirLen;
// No need to re-nullptr terminate
}
size_t fileLen = wcslen(aModule);
wcsncpy(systemPath + systemDirLen, aModule,
MAX_PATH - systemDirLen);
if (systemDirLen + fileLen <= MAX_PATH) {
systemPath[systemDirLen + fileLen] = L'\0';
} else {
systemPath[MAX_PATH] = L'\0';
}
return LoadLibraryW(systemPath);
}
}
#endif