Windows: Use WinAPI CommandLineToArgvW() to create argv from command line.

Split the Windows CE/Desktop Windows code paths in winmain.
Use CommandLineToArgvW() to obtain argv[] for Desktop Windows.

[ChangeLog][QtCore][Windows] Command line parsing on Windows
now uses the WinAPI function CommandLineToArgvW() to exactly
match the quoting of the command interpreter.

Task-number: QTBUG-35432
Task-number: QTBUG-23687
Change-Id: I6743e73649d953497642f7717d3731a83ffda2a2
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qcoreapplication_win.cpp

@@ -1,7 +1,7 @@
 /****************************************************************************
 **
 ** Copyright (C) 2013 Samuel Gaist <samuel.gaist@edeltech.ch>
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
@@ -145,14 +145,30 @@ QString QCoreApplicationPrivate::appName() const
   qWinMain() - Initializes Windows. Called from WinMain() in qtmain_win.cpp
  *****************************************************************************/
 
-#if defined(Q_OS_WINCE)
+#if !defined(Q_OS_WINCE) && !defined(Q_OS_WINRT)
-Q_CORE_EXPORT void __cdecl qWinMain(HINSTANCE instance, HINSTANCE prevInstance, LPSTR cmdParam,
+
-               int cmdShow, int &argc, QVector<char *> &argv)
+// ### Qt6: FIXME: Remove this function. It is only there since for binary
-#else
+// compatibility for applications built with Qt 5.3 using qtmain.lib which calls it.
+// In Qt 5.4, qtmain.lib was changed to use CommandLineToArgvW() without calling into Qt5Core.
 Q_CORE_EXPORT
 void qWinMain(HINSTANCE instance, HINSTANCE prevInstance, LPSTR cmdParam,
+              int cmdShow, int &argc, QVector<char *> &argv)
+{
+    Q_UNUSED(instance)
+    Q_UNUSED(prevInstance)
+    Q_UNUSED(cmdShow)
+
+    const QStringList wArgv = qWinCmdArgs(QString::fromLocal8Bit(cmdParam));
+    argv.clear();
+    argc = wArgv.size();
+    foreach (const QString &wArg, wArgv)
+        argv.append(_strdup(wArg.toLocal8Bit().constData()));
+}
+
+#elif defined(Q_OS_WINCE)
+
+Q_CORE_EXPORT void __cdecl qWinMain(HINSTANCE instance, HINSTANCE prevInstance, LPSTR cmdParam,
                int cmdShow, int &argc, QVector<char *> &argv)
-#endif
 {
     static bool already_called = false;
 
@@ -172,6 +188,8 @@ void qWinMain(HINSTANCE instance, HINSTANCE prevInstance, LPSTR cmdParam,
     Q_UNUSED(prevInstance);
 }
 
+#endif // Q_OS_WINCE
+
 #ifndef QT_NO_QOBJECT
 
 void QCoreApplicationPrivate::removePostedTimerEvent(QObject *object, int timerId)

src/corelib/kernel/qcorecmdlineargs_p.h

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
@@ -56,14 +56,34 @@
 #include "QtCore/qstring.h"
 #include "QtCore/qstringlist.h"
 
+#if defined(Q_OS_WIN)
+#  ifdef Q_OS_WIN32
+#    include <qt_windows.h> // first to suppress min, max macros.
+#    include <shlobj.h>
+#  else
+#    include "QtCore/qvector.h"
+#    include <qt_windows.h>
+#  endif
+
 QT_BEGIN_NAMESPACE
 
-#if defined(Q_OS_WIN) && !defined(Q_OS_WINRT)
+#if defined(Q_OS_WIN32)
 
-QT_BEGIN_INCLUDE_NAMESPACE
+static inline QStringList qWinCmdArgs(const QString &cmdLine)
-#  include "QtCore/qvector.h"
+{
-#  include <qt_windows.h>
+    QStringList result;
-QT_END_INCLUDE_NAMESPACE
+    int size;
+    if (wchar_t **argv = CommandLineToArgvW((const wchar_t *)cmdLine.utf16(), &size)) {
+        result.reserve(size);
+        wchar_t **argvEnd = argv + size;
+        for (wchar_t **a = argv; a < argvEnd; ++a)
+            result.append(QString::fromWCharArray(*a));
+        LocalFree(argv);
+    }
+    return result;
+}
+
+#elif defined(Q_OS_WINCE) // Q_OS_WIN32
 
 // template implementation of the parsing algorithm
 // this is used from qcoreapplication_win.cpp and the tools (rcc, uic...)
@@ -149,7 +169,7 @@ static inline QStringList qCmdLineArgs(int argc, char *argv[])
     return qWinCmdArgs(cmdLine);
 }
 
-#else  // Q_OS_WIN && !Q_OS_WINRT
+#elif defined(Q_OS_WINRT) // Q_OS_WINCE
 
 static inline QStringList qCmdLineArgs(int argc, char *argv[])
 {
@@ -159,8 +179,10 @@ static inline QStringList qCmdLineArgs(int argc, char *argv[])
     return args;
 }
 
-#endif // !Q_OS_WIN || Q_OS_WINRT
+#endif // Q_OS_WINRT
 
 QT_END_NAMESPACE
 
+#endif // Q_OS_WIN
+
 #endif // QCORECMDLINEARGS_WIN_P_H

src/winmain/qtmain_win.cpp

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the Windows main function of the Qt Toolkit.
@@ -43,6 +43,10 @@
 #include "qstring.h"
 #include "qvector.h"
 
+#ifndef Q_OS_WINCE
+#  include <shlobj.h>
+#endif
+
 /*
   This file contains the code in the qtmain library for Windows.
   qtmain contains the Windows startup code and is required for
@@ -83,26 +87,49 @@ extern "C" int main(int, char **);
   application.
 */
 
-#ifdef Q_OS_WINCE
+#ifndef Q_OS_WINCE
+
+// Convert a wchar_t to char string, equivalent to QString::toLocal8Bit()
+// when passed CP_ACP.
+static inline char *wideToMulti(int codePage, const wchar_t *aw)
+{
+    const int required = WideCharToMultiByte(codePage, 0, aw, -1, NULL, 0, NULL, NULL);
+    char *result = new char[required];
+    WideCharToMultiByte(codePage, 0, aw, -1, result, required, NULL, NULL);
+    return result;
+}
+
+extern "C" int APIENTRY WinMain(HINSTANCE, HINSTANCE, LPSTR /*cmdParamarg*/, int /* cmdShow */)
+{
+    int argc;
+    wchar_t **argvW = CommandLineToArgvW(GetCommandLineW(), &argc);
+    if (!argvW)
+        return -1;
+    char **argv = new char *[argc];
+    for (int i = 0; i < argc; ++i)
+        argv[i] = wideToMulti(CP_ACP, argvW[i]);
+    LocalFree(argvW);
+    const int exitCode = main(argc, argv);
+    for (int i = 0; i < argc; ++i)
+        delete [] argv[i];
+    delete [] argv;
+    return exitCode;
+}
+
+#else // !Q_OS_WINCE
+
 int WINAPI WinMain(HINSTANCE instance, HINSTANCE prevInstance, LPWSTR /*wCmdParam*/, int cmdShow)
-#else
-extern "C"
-int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, LPSTR /*cmdParamarg*/, int cmdShow)
-#endif
 {
     QByteArray cmdParam = QString::fromWCharArray(GetCommandLine()).toLocal8Bit();
 
-#if defined(Q_OS_WINCE)
     wchar_t appName[MAX_PATH];
     GetModuleFileName(0, appName, MAX_PATH);
     cmdParam.prepend(QString(QLatin1String("\"%1\" ")).arg(QString::fromWCharArray(appName)).toLocal8Bit());
-#endif
 
     int argc = 0;
     QVector<char *> argv(8);
     qWinMain(instance, prevInstance, cmdParam.data(), cmdShow, argc, argv);
 
-#if defined(Q_OS_WINCE)
     wchar_t uniqueAppID[MAX_PATH];
     GetModuleFileName(0, uniqueAppID, MAX_PATH);
     QString uid = QString::fromWCharArray(uniqueAppID).toLower().replace(QLatin1String("\\"), QLatin1String("_"));
@@ -126,11 +153,10 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, LPSTR /*cmdPara
             SetForegroundWindow((HWND)(((ULONG)aHwnd) | 0x01));
         return 0;
     }
-#endif // Q_OS_WINCE
 
     int result = main(argc, argv.data());
-#if defined(Q_OS_WINCE)
     CloseHandle(mutex);
-#endif
     return result;
 }
+
+#endif // Q_OS_WINCE

src/winmain/winmain.pro

@@ -20,6 +20,8 @@ winrt {
     SOURCES = qtmain_winrt.cpp
 } else {
     SOURCES = qtmain_win.cpp
+
+    !wince: LIBS += -lshell32
 }
 
 load(qt_installs)