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163 | /* ============================================================
*
* This file is a part of digiKam project
* https://www.digikam.org
*
* Date : 2019-04-02
* Description : plugin to export image as wallpaper - Windows version.
*
* SPDX-FileCopyrightText: 2019 by Igor Antropov <antropovi at yahoo dot com>
* SPDX-FileCopyrightText: 2019-2025 by Gilles Caulier <caulier dot gilles at gmail dot com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* ============================================================ */
#include "wallpaperplugin.h"
// Qt includes
#include <QMessageBox>
#include <QProcess>
#include <QDir>
// KDE includes
#include <klocalizedstring.h>
// Local includes
#include "digikam_debug.h"
// Windows includes
#ifdef Q_OS_WIN
# include <windows.h>
# include <wininet.h>
# include <shlobj.h>
#endif
namespace DigikamGenericWallpaperPlugin
{
bool s_checkErrorCode(HRESULT status, const QString& path, const QString& context)
{
if (FAILED(status))
{
// Code to catch error string from error code with Windows API.
LPWSTR bufPtr = nullptr;
DWORD werr = GetLastError();
FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
werr,
0,
(LPWSTR)&bufPtr,
0,
nullptr);
// cppcheck-suppress knownConditionTrueFalse
QString errStr = (bufPtr) ? QString::fromUtf16((const ushort*)bufPtr).trimmed()<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
: i18n("Unknown Error %1", werr);
LocalFree(bufPtr);
QMessageBox::warning(nullptr,
i18nc("@title:window",
"Error While to Set Image as Wallpaper"),
i18n("Cannot change wallpaper image from current desktop with\n"
"%1\n\nContext: %2\n\nError: %3",
path,
context,
errStr));
return false;
}
return true;
}
bool WallpaperPlugin::setWallpaper(const QString& path, int layout) const
{
// NOTE: IDesktopWallpaper is only defined with Windows >= 8.
// To be compatible with Windows 7, we needs to use IActiveDesktop instead.
CoInitializeEx(0, COINIT_APARTMENTTHREADED);
IActiveDesktop* iADesktop = nullptr;
HRESULT status = CoCreateInstance(CLSID_ActiveDesktop,
nullptr,
CLSCTX_INPROC_SERVER,
IID_IActiveDesktop,
(void**)&iADesktop);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
if (!s_checkErrorCode(status, path, i18n("Cannot create desktop context.")))
{
CoUninitialize();
return false;
}
WALLPAPEROPT wOption;
ZeroMemory(&wOption, sizeof(WALLPAPEROPT));
wOption.dwSize = sizeof(WALLPAPEROPT);
switch (layout)
{
case Mosaic:
{
wOption.dwStyle = WPSTYLE_TILE;
break;
}
case Centered:
{
wOption.dwStyle = WPSTYLE_CENTER;
break;
}
default: // *Adjusted*
{
wOption.dwStyle = WPSTYLE_STRETCH;
break;
}
}
status = iADesktop->SetWallpaper((PCWSTR)QDir::toNativeSeparators(path).utf16(), 0);
if (!s_checkErrorCode(status, path, i18n("Cannot set wall paper image path.")))
{
iADesktop->Release();
CoUninitialize();
return false;
}
status = iADesktop->SetWallpaperOptions(&wOption, 0);
if (!s_checkErrorCode(status, path, i18n("Cannot set wallpaper properties.")))
{
iADesktop->Release();
CoUninitialize();
return false;
}
status = iADesktop->ApplyChanges(AD_APPLY_ALL);
if (!s_checkErrorCode(status, path, i18n("Cannot apply changes to desktop wallpaper.")))
{
iADesktop->Release();
CoUninitialize();
return false;
}
iADesktop->Release();
CoUninitialize();
return true;
}
} // namespace DigikamGenericWallpaperPlugin
|