rstudio/src/cpp/desktop/DesktopWin32ApplicationLaunch.cpp at master · pearsonca/rstudio · GitHub

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* DesktopWin32ApplicationLaunch.cpp

* Unless you have received this program directly from RStudio pursuant

* to the terms of a commercial license agreement with RStudio, then

* this program is licensed to you under the terms of version 3 of the

* GNU Affero General Public License. This program is distributed WITHOUT

* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,

* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the

* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.

#include "DesktopApplicationLaunch.hpp"

#include <windows.h>

#include <QWidget>

#include <core/system/Process.hpp>

#include <core/system/Environment.hpp>

#include <core/r_util/RUserData.hpp>

#include "DesktopOptions.hpp"

This class is implemented using a message-only Win32 window with

a well-known window title. The message-only window can respond

to a "get main window handle" message, which will return the HWND

of the application's main window. It also responds to WM_COPYDATA

with OPENFILE as dwData, which causes openFileRequest(QString) to

be signaled with the copied data.

It also uses a lockfile (%TEMP%\rstudio.lock) to try to ensure two

copies of the app don't run concurrently even if something goes

wrong with the message-only window.

namespace rstudio {

namespace desktop {

namespace {

const ULONG_PTR OPENFILE = 1;

const char* WINDOW_TITLE = "RStudio_LaunchWindow_6dd82276-ccc3-4324-839e-4e6bcd5145bd";

UINT wmGetMainWindowHandle()

{

static UINT msg = 0;

if (!msg)

msg = ::RegisterWindowMessage("3dd567f8-7c07-4d9d-934b-dcb922cd737e");

return msg;

}

void activate(HWND hWnd)

{

HWND hwndPopup = ::GetLastActivePopup(hWnd);

if (::IsWindow(hwndPopup))

hWnd = hwndPopup;

::SetForegroundWindow(hWnd);

if (::IsIconic(hWnd))

::ShowWindow(hWnd, SW_RESTORE);

}

} // anonymous namespace

ApplicationLaunch::ApplicationLaunch() :

QWidget(nullptr),

pMainWindow_(nullptr)

{

setAttribute(Qt::WA_NativeWindow);

setWindowTitle(QString::fromUtf8(WINDOW_TITLE));

::SetParent((HWND)winId(), HWND_MESSAGE);

}

void ApplicationLaunch::init(QString,

int& argc,

char* argv[],

boost::scoped_ptr<QApplication>* ppApp,

boost::scoped_ptr<ApplicationLaunch>* ppAppLaunch)

{

ppApp->reset(new QApplication(argc, argv));

ppAppLaunch->reset(new ApplicationLaunch());

}

void ApplicationLaunch::setActivationWindow(QWidget* pWindow)

{

pMainWindow_ = pWindow;

}

void ApplicationLaunch::activateWindow()

{

if (pMainWindow_)

activate((HWND) pMainWindow_->winId());

else

activate((HWND) winId());

}

QString ApplicationLaunch::startupOpenFileRequest() const

{

return QString();

}

namespace {

bool acquireLock()

{

// The file is implicitly released/deleted when the process exits

QString lockFilePath = QDir::temp().absoluteFilePath(QString::fromUtf8("rstudio.lock"));

HANDLE hFile = ::CreateFileW(lockFilePath.toStdWString().c_str(),

GENERIC_WRITE,

0, // exclusive access

nullptr,

OPEN_ALWAYS,

FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE,

nullptr);

if (hFile == INVALID_HANDLE_VALUE)

{

if (::GetLastError() == ERROR_SHARING_VIOLATION)

return false;

}

return true;

}

} // anonymous namespace

void ApplicationLaunch::attemptToRegisterPeer()

{

acquireLock();

}

bool ApplicationLaunch::sendMessage(QString filename)

{

if (acquireLock())

return false;

HWND hwndAppLaunch = nullptr;

{

hwndAppLaunch = ::FindWindowEx(HWND_MESSAGE, hwndAppLaunch, nullptr, WINDOW_TITLE);

} while (hwndAppLaunch == (HWND)winId()); // Ignore ourselves

if (::IsWindow(hwndAppLaunch))

{

HWND hwnd = reinterpret_cast<HWND>(::SendMessage(hwndAppLaunch,

wmGetMainWindowHandle(),

0));

if (::IsWindow(hwnd))

{

activate(hwnd);

if (!filename.isEmpty())

{

QByteArray data = filename.toUtf8();

COPYDATASTRUCT copydata;

copydata.dwData = OPENFILE;

copydata.lpData = data.data();

copydata.cbData = data.size();

HWND sender = (HWND)winId();

::SendMessage(hwndAppLaunch,

WM_COPYDATA,

reinterpret_cast<WPARAM>(sender),

reinterpret_cast<LPARAM>(&copydata));

}

return true;

}

bool ApplicationLaunch::nativeEvent(const QByteArray & eventType,

void * msg,

long * result)

{

MSG* message = reinterpret_cast<MSG*>(msg);

if (message->message == WM_COPYDATA)

{

COPYDATASTRUCT* cds = reinterpret_cast<COPYDATASTRUCT*>(message->lParam);

if (cds->dwData == OPENFILE)

{

QString fileName = QString::fromUtf8(

reinterpret_cast<char*>(cds->lpData),

cds->cbData);

openFileRequest(fileName);

*result = 1;

return true;

}

else if (message->message == wmGetMainWindowHandle())

{

if (pMainWindow_)

*result = reinterpret_cast<LRESULT>((HWND)(pMainWindow_->winId()));

else

*result = 0;

return true;

}

return QWidget::nativeEvent(eventType, message, result);

}

void ApplicationLaunch::launchRStudio(const std::vector<std::string>& args,

const std::string& initialDir)

{

core::system::ProcessOptions options;

options.breakawayFromJob = true;

options.detachProcess = true;

// supply initial dir to child process if specified

core::system::Options childEnv;

core::system::environment(&childEnv);

if (!initialDir.empty())

{

core::system::setenv(&childEnv, kRStudioInitialWorkingDir, initialDir);

options.environment = childEnv;

}

core::Error error = core::system::runProgram(

desktop::options().executablePath().getAbsolutePath(),

args,

"",

options,

nullptr);

if (error)

LOG_ERROR(error);

}

} // namespace desktop

} // namespace rstudio

rstudio/src/cpp/desktop/DesktopWin32ApplicationLaunch.cpp at master · pearsonca/rstudio · GitHub

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