path: root/src/corelib/plugin/qlibrary_win.cpp

// 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 namespaceQt::StringLiterals;extern QString qt_error_string(int code); QStringList QLibraryPrivate::suffixes_sys(const QString& fullVersion){Q_UNUSED(fullVersion);returnQStringList(QStringLiteral(".dll"));}boolQLibraryPrivate::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 outif(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);}boolQLibraryPrivate::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);returnQFunctionPointer(address);} QT_END_NAMESPACE