[Qt, Win] honor current network when creating autostart link

- creates a "Bitcoin (testnet).lnk" when on testnet or a "Bitcoin
  (regtest).lnk, when on regtest
- fixes #5778

src/qt/guiutil.cpp

@@ -40,6 +40,7 @@
 #if BOOST_FILESYSTEM_VERSION >= 3
 #include <boost/filesystem/detail/utf8_codecvt_facet.hpp>
 #endif
+#include <boost/scoped_array.hpp>
 
 #include <QAbstractItemView>
 #include <QApplication>
@@ -567,12 +568,17 @@ TableViewLastColumnResizingFixer::TableViewLastColumnResizingFixer(QTableView* t
 #ifdef WIN32
 boost::filesystem::path static StartupShortcutPath()
 {
+    if (GetBoolArg("-testnet", false))
+        return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin (testnet).lnk";
+    else if (GetBoolArg("-regtest", false))
+        return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin (regtest).lnk";
+
     return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin.lnk";
 }
 
 bool GetStartOnSystemStartup()
 {
-    // check for Bitcoin.lnk
+    // check for Bitcoin*.lnk
     return boost::filesystem::exists(StartupShortcutPath());
 }
 
@@ -588,8 +594,8 @@ bool SetStartOnSystemStartup(bool fAutoStart)
         // Get a pointer to the IShellLink interface.
         IShellLink* psl = NULL;
         HRESULT hres = CoCreateInstance(CLSID_ShellLink, NULL,
-                                CLSCTX_INPROC_SERVER, IID_IShellLink,
-                                reinterpret_cast<void**>(&psl));
+            CLSCTX_INPROC_SERVER, IID_IShellLink,
+            reinterpret_cast<void**>(&psl));
 
         if (SUCCEEDED(hres))
         {
@@ -597,20 +603,34 @@ bool SetStartOnSystemStartup(bool fAutoStart)
             TCHAR pszExePath[MAX_PATH];
             GetModuleFileName(NULL, pszExePath, sizeof(pszExePath));
 
-            TCHAR pszArgs[5] = TEXT("-min");
+            // Start client minimized
+            QString strArgs = "-min";
+            // Set -testnet /-regtest options
+            strArgs += QString::fromStdString(strprintf(" -testnet=%d -regtest=%d", GetBoolArg("-testnet", false), GetBoolArg("-regtest", false)));
+
+#ifdef UNICODE
+            boost::scoped_array<TCHAR> args(new TCHAR[strArgs.length() + 1]);
+            // Convert the QString to TCHAR*
+            strArgs.toWCharArray(args.get());
+            // Add missing '\0'-termination to string
+            args[strArgs.length()] = '\0';
+#endif
 
             // Set the path to the shortcut target
             psl->SetPath(pszExePath);
             PathRemoveFileSpec(pszExePath);
             psl->SetWorkingDirectory(pszExePath);
             psl->SetShowCmd(SW_SHOWMINNOACTIVE);
-            psl->SetArguments(pszArgs);
+#ifndef UNICODE
+            psl->SetArguments(strArgs.toStdString().c_str());
+#else
+            psl->SetArguments(args.get());
+#endif
 
             // Query IShellLink for the IPersistFile interface for
             // saving the shortcut in persistent storage.
             IPersistFile* ppf = NULL;
-            hres = psl->QueryInterface(IID_IPersistFile,
-                                       reinterpret_cast<void**>(&ppf));
+            hres = psl->QueryInterface(IID_IPersistFile, reinterpret_cast<void**>(&ppf));
             if (SUCCEEDED(hres))
             {
                 WCHAR pwsz[MAX_PATH];
@@ -630,7 +650,6 @@ bool SetStartOnSystemStartup(bool fAutoStart)
     }
     return true;
 }
-
 #elif defined(Q_OS_LINUX)
 
 // Follow the Desktop Application Autostart Spec: