From ee11aca2af5a01bf433028fd678bf398985da422 Mon Sep 17 00:00:00 2001
From: Flamefire <alex@grundis.de>
Date: Thu, 3 Oct 2013 13:23:49 +0200
Subject: [PATCH] Add requirement checks at program start.

---
 Vocaluxe/CProgrammHelper.cs | 99 +++++++++++++++++++++++++++++++++++++
 Vocaluxe/Program.cs         |  6 ++-
 Vocaluxe/Vocaluxe.csproj    |  3 +-
 3 files changed, 105 insertions(+), 3 deletions(-)
 create mode 100644 Vocaluxe/CProgrammHelper.cs

diff --git a/Vocaluxe/CProgrammHelper.cs b/Vocaluxe/CProgrammHelper.cs
new file mode 100644
index 00000000..de0a61a9
--- /dev/null
+++ b/Vocaluxe/CProgrammHelper.cs
@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Security;
+using System.Text;
+using Microsoft.Win32;
+using Vocaluxe.Base;
+
+namespace Vocaluxe
+{
+    /// <summary>
+    /// Some helper functions for the programm
+    /// </summary>
+    static class CProgrammHelper
+    {
+        private static bool _CheckUninstallKey(string name, string key)
+        {
+            using (RegistryKey rk = Registry.LocalMachine.OpenSubKey(key))
+            {
+                if (rk == null)
+                    throw new SecurityException();
+                foreach (string skName in rk.GetSubKeyNames())
+                {
+                    using (RegistryKey sk = rk.OpenSubKey(skName))
+                    {
+                        if (sk == null || sk.GetValue("DisplayName") == null)
+                            continue;
+                        string displayName = sk.GetValue("DisplayName").ToString().ToLower();
+                        if (displayName.Equals(name) || displayName.StartsWith(name) || name.StartsWith(displayName))
+                            return true;
+                    }
+                }
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// Checks if a given program is installed by checking the Uninstall registry key.
+        /// </summary>
+        /// <param name="name">Name of the programm. Got to equal the displayname in the key or one needs to be the start of the other one. NOT case sensitive.</param>
+        /// <returns></returns>
+        private static bool _IsProgramInstalled(string name)
+        {
+            const string uninstallKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
+            const string uninstallKeyx64 = @"SOFTWARE\WoW6432Node\Microsoft\Windows\CurrentVersion\Uninstall";
+            name = name.ToLower();
+            return _CheckUninstallKey(name, uninstallKey) || _CheckUninstallKey(name, uninstallKeyx64);
+        }
+
+        private static bool _SystemDllExists(string dllName)
+        {
+            const string sysDir = "%windir%\\system32\\";
+            return File.Exists(Environment.ExpandEnvironmentVariables(sysDir + dllName + ".dll"));
+        }
+
+        private static bool _IsVC2012Installed()
+        {
+            return _SystemDllExists("msvcr110") && _SystemDllExists("msvcp110");
+        }
+
+        private static bool _IsVC2008Installed()
+        {
+            return _IsProgramInstalled("Microsoft Visual C++ 2008 Redistributable");
+        }
+
+        private static bool _IsVC2010Installed()
+        {
+            //Note: Maybe check for x64 or x86
+            return _IsProgramInstalled("Microsoft Visual C++ 2010");
+        }
+
+        public static bool CheckRequirements()
+        {
+            if (!_IsVC2012Installed())
+            {
+                CLog.LogError(
+                    "VC++ 2012 Redistributables are missing. Please install them first.\r\nDownload: http://www.microsoft.com/de-de/download/details.aspx?id=30679",
+                    true, true);
+                return false;
+            }
+            bool vc2008Installed = _IsVC2008Installed();
+            if (!vc2008Installed)
+            {
+                CLog.LogError(
+                    "VC++ 2008 Redistributables are missing. Portaudio might not be working.\r\nDownload: http://www.microsoft.com/de-de/download/details.aspx?id=29");
+            }
+            if (!vc2008Installed && !_IsVC2010Installed())
+            {
+                CLog.LogError(
+                    "VC++ 2010 and 2008 Redistributables are missing. Please install them first. VC++ 2008 is preferred as Portaudio doesn't work with VC++ 2010.\r\nDownload(2008): http://www.microsoft.com/de-de/download/details.aspx?id=29 \r\nDownload(2010): http://www.microsoft.com/de-de/download/details.aspx?id=5555",
+                    true, true);
+                return false;
+            }
+            return true;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Vocaluxe/Program.cs b/Vocaluxe/Program.cs
index 63758783..fa626f04 100644
--- a/Vocaluxe/Program.cs
+++ b/Vocaluxe/Program.cs
@@ -30,7 +30,6 @@ using Vocaluxe.Base.Server;
 
 namespace Vocaluxe
 {
-    // just a small comment for the new develop branch
     static class CMainProgram
     {
         private static CSplashScreen _SplashScreen;
@@ -77,6 +76,9 @@ namespace Vocaluxe
                 // Init Log
                 CLog.Init();
 
+                if (!CProgrammHelper.CheckRequirements())
+                    return;
+
                 CMain.Init();
                 CSettings.CreateFolders();
                 Application.DoEvents();
@@ -253,7 +255,7 @@ namespace Vocaluxe
         [HandleProcessCorruptedStateExceptions]
         private static void UnhandledExceptionHandler(object sender, UnhandledExceptionEventArgs args)
         {
-            Exception e = (Exception)args.ExceptionObject;
+            var e = (Exception)args.ExceptionObject;
             string stackTrace = "";
             try
             {
diff --git a/Vocaluxe/Vocaluxe.csproj b/Vocaluxe/Vocaluxe.csproj
index 952a7804..17132251 100644
--- a/Vocaluxe/Vocaluxe.csproj
+++ b/Vocaluxe/Vocaluxe.csproj
@@ -232,6 +232,7 @@
     <Compile Include="Base\Server\CCommands.cs" />
     <Compile Include="Base\Server\CVocaluxeServer.cs" />
     <Compile Include="Base\Server\VocaluxeStructs.cs" />
+    <Compile Include="CProgrammHelper.cs" />
     <Compile Include="CSplashScreen.cs">
       <SubType>Form</SubType>
     </Compile>
@@ -336,4 +337,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>
\ No newline at end of file