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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qplatformdefs.h"
#include "qlibrary_p.h"
#include "qdir.h"
#include "qfile.h"
#include "qfileinfo.h"
#include <private/qfilesystementry_p.h>
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
extern QString qt_error_string(int code);
QStringList QLibraryPrivate::suffixes_sys(const QString& fullVersion)
{
Q_UNUSED(fullVersion);
return QStringList(QStringLiteral(".dll"));
}
QStringList QLibraryPrivate::prefixes_sys()
{
return QStringList();
}
bool QLibraryPrivate::load_sys()
{
//avoid 'Bad Image' message box
UINT oldmode = SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOOPENFILEERRORBOX);
// We make the following attempts at locating the library:
//
// Windows
// if (absolute)
// fileName
// fileName + ".dll"
// else
// fileName + ".dll"
// fileName
//
// NB If it's a plugin we do not ever try the ".dll" extension
QMutexLocker locker(&mutex);
QStringList attempts;
if (pluginState != IsAPlugin)
attempts.append(fileName + ".dll"_L1);
// If the fileName is an absolute path we try that first, otherwise we
// use the system-specific suffix first
QFileSystemEntry fsEntry(fileName);
if (fsEntry.isAbsolute())
attempts.prepend(fileName);
else
attempts.append(fileName);
locker.unlock();
Handle hnd = nullptr;
for (const QString &attempt : std::as_const(attempts)) {
hnd = LoadLibrary(reinterpret_cast<const wchar_t*>(QDir::toNativeSeparators(attempt).utf16()));
// If we have a handle or the last error is something other than "unable
// to find the module", then bail out
if (hnd || ::GetLastError() != ERROR_MOD_NOT_FOUND)
break;
}
SetErrorMode(oldmode);
locker.relock();
if (!hnd) {
errorString = QLibrary::tr("Cannot load library %1: %2").arg(
QDir::toNativeSeparators(fileName), qt_error_string());
} else {
// Query the actual name of the library that was loaded
errorString.clear();
wchar_t buffer[MAX_PATH];
::GetModuleFileName(hnd, buffer, MAX_PATH);
QString moduleFileName = QString::fromWCharArray(buffer);
moduleFileName.remove(0, 1 + moduleFileName.lastIndexOf(u'\\'));
const QDir dir(fsEntry.path());
if (dir.path() == "."_L1)
qualifiedFileName = moduleFileName;
else
qualifiedFileName = dir.filePath(moduleFileName);
if (loadHints() & QLibrary::PreventUnloadHint) {
// prevent the unloading of this component
HMODULE hmod;
bool ok = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_PIN |
GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
reinterpret_cast<const wchar_t *>(hnd),
&hmod);
Q_ASSERT(!ok || hmod == hnd);
Q_UNUSED(ok);
}
}
pHnd.storeRelaxed(hnd);
return (pHnd != nullptr);
}
bool QLibraryPrivate::unload_sys()
{
if (!FreeLibrary(pHnd.loadAcquire())) {
errorString = QLibrary::tr("Cannot unload library %1: %2").arg(
QDir::toNativeSeparators(fileName), qt_error_string());
return false;
}
errorString.clear();
return true;
}
QFunctionPointer QLibraryPrivate::resolve_sys(const char *symbol)
{
FARPROC address = GetProcAddress(pHnd.loadAcquire(), symbol);
return QFunctionPointer(address);
}
QT_END_NAMESPACE
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