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--- devwiki:cs [2022/04/05 05:41] – [Mac and Visual Studio with C#] ying
+++ devwiki:cs [2022/05/07 06:53] (current) – [C# Basic] ying
@@ Line 39: / Line 39: @@
 List<int> numberList = new List<int>();
 numberList.Add(32); // like python append
+// write out list as string
+Console.WriteLine( string.Join(", ", selected.ToArray() )
 int[] extraArray = {10,11,12};
@@ Line 62: / Line 65: @@
 // c# has Stack object for Push() and Pop()
 // c# extra: SortedSet, HashSet
+</code>
+  * timestamp to datetime conversion <code csharp>
+using System;
+public DateTime UnixTimeStampToDateTime(double unixTimeStamp)
+{
+  // Unix timestamp is seconds past epoch
+  DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
+  dateTime = dateTime.AddSeconds(unixTimeStamp).ToLocalTime();
+  return dateTime;
+}
 </code>
 ====== C# and Visual Studio Community edition ======
@@ Line 105: / Line 119: @@
   * for windows, since mono compatible with .NET, so mostly can directly run
   * mono app is small like few kb.
-====== method: launch script ======
+**Problem and Solution**
+  * Problem: visual studio 2019 + mac + gtk# project + compile warning about locale and no Tool panel to add widget
+    * Gtk-WARNING **: Locale not supported by C library
+  * Solution: write your code in a code editor, and use command-line compile method below,
+    * it is visual studio problem, next version may fix.
+====== GTK and Mono compile commandline ======
+  * write your cs with gtk lib, save as cs file
+  * compile with <code>mcs -pkg:gtk-sharp-2.0 AppName.cs AppNameExtra.cs</code>
+  * you get a exe <code>mono AppName.exe</code>
+    * ref:
+    * https://www.mono-project.com/docs/gui/gtksharp/beginners-guide/
+    * https://zetcode.com/gui/gtksharp/firststeps/
+===== method: launch script =====
   * AppName file with chmod +x to make it launch script, the script will use its name(AppName this case) to launch AppName.exe next to it<code bash AppName>
@@ Line 119: / Line 148: @@
 </code>
+===== method: mac app auto build script =====
+  * AppName_build file with chmod +x to make it build script, the script will use its name and _build (AppName_build this case) to pack AppName.exe next to it into a AppName.app mac app<code bash AppName_build>
+#!/bin/sh
+# auto build Mono GTK# App on Mac by ying
+# v0.1 (2022.04.04)
+app_build_name=`basename $0`
+part_list=(${app_build_name//_/ })
+app_name=${part_list[0]}
+echo $app_name
+macpack -m:cocoa -o:./App -n $app_name -a:$app_name.exe
+</code>
 ====== .NET framework install requirement for your C# app ======
@@ Line 129: / Line 168: @@
       * like, win7 = v3.5 .NET; win8 = v4.5 .NET; win10 = v4.6 .NET; xp = v1.0 .NET
+| Target framework | version | C# version default |
+| .NET           | 6.x | C# 10  |
+| .NET           | 5.x | C# 9.0 |
+| .NET Core      | 3.x | C# 8.0 |
+| .NET Core      | 2.x | C# 7.3 |
+| .NET Standard  | 2.1 | C# 8.0 |
+| .NET Standard  | 2.0 | C# 7.3 |
+| .NET Standard  | 1.x | C# 7.3 |
+| .NET Framework | all | C# 7.3 |
+  * if you use Gtk# ui, you also need to install gtk# (so basically .NET + GTK# make all those exe run fine)
+    * (GTK# for .NET: Installer for running Gtk#-based applications on Microsoft .NET:)
+    * https://www.mono-project.com/download/stable/#download-win
+  * note: no need the mono installer, since if use mono, you need to use mono AppName.exe to run it, with .NET installed, you can direct click exe and run
+  * Problem and Solution:
+    * BadImageFormatException error
+    * Solution: make sure install x86 version of .NET, since most app made are 32bit, not 64bit.
+Problem and Solution:
+  * VS 2019 code complain C# version 7.3 cant support certain thing, use C# ver 9. But your right click on your Project Name > Property : (right side) Build tab - Advanced button > Language version (it says "Automatically selected based on framework version")
+    * Solution: go your project folder, edit .csproj file, add following code <code>
+<PropertyGroup>
+    <LangVersion>latest</LangVersion>
+</PropertyGroup>
+</code>
+    * ref:
+    * https://stackoverflow.com/questions/56149841/visual-studio-2019-version-c-sharp-probleme
+    * https://stackoverflow.com/questions/58624146/feature-using-declarations-is-not-available-in-c-sharp-7-3-please-use-languag
+    * https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version
+    * https://dailydotnettips.com/how-to-check-default-language-version-in-visual-studio/
 ====== .Net UI frameworks options ======
@@ Line 237: / Line 308: @@
 </code>
+====== My App - Output Selected Item in Top Most Explorer in CSharp ======
+<code csharp Program.cs>
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+/*
+ListSelection: (By Shining Ying)
+  * v0.1: (2022.05.01) list selected item in top most explorer
+use with python:
+import subprocess
+app = r"D:\Projects\Dev\ListSelection\ListSelection\bin\Release\ListSelection.exe"
+info=subprocess.Popen( '{0}'.format(app),stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.PIPE )
+out, err = info.communicate()
+result_list = [x.strip() for x in out.split('\n') if x.strip()!='' and not x.strip().startswith('#') ]
+ */
+namespace ListSelection
+{
+    class Program
+    {
+        // need user32 to use get foreground window
+        [System.Runtime.InteropServices.DllImport("user32.dll")]
+        private static extern IntPtr GetForegroundWindow();
+        [System.Runtime.InteropServices.DllImport("user32.dll")]
+        private static extern IntPtr GetTopWindow(IntPtr hWnd);
+        [System.Runtime.InteropServices.DllImport("user32.dll")]
+        private static extern bool IsWindowVisible(IntPtr hWnd);
+        [System.Runtime.InteropServices.DllImport("user32.dll")]
+        static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
+        enum GetWindow_Cmd : uint
+        {
+            GW_HWNDFIRST = 0,
+            GW_HWNDLAST = 1,
+            GW_HWNDNEXT = 2,
+            GW_HWNDPREV = 3,
+            GW_OWNER = 4,
+            GW_CHILD = 5,
+            GW_ENABLEDPOPUP = 6
+        }
+        // stathread needed to fix unable to cast com object error, as it needs sta thread to use shell object
+        // https://stackoverflow.com/questions/31403956/exception-when-using-shell32-to-get-file-extended-properties
+        [STAThread]
+        static void Main(string[] args)
+        {
+            List<IntPtr> order_list = new List<IntPtr>();
+            /*IntPtr fg_handle = GetForegroundWindow();*/
+            IntPtr top_handle = GetTopWindow((IntPtr)null);
+            if (top_handle != IntPtr.Zero)
+            {
+                //Console.WriteLine((int)top_handle);
+                if (IsWindowVisible(top_handle))
+                {
+                    order_list.Add(top_handle);
+                }
+            }
+            IntPtr top_next = GetWindow(top_handle, 2);
+            while (top_next != IntPtr.Zero) {
+                //Console.WriteLine((int)top_next);
+                if (IsWindowVisible(top_next)) {
+                    order_list.Add(top_next);
+                }
+                top_next = GetWindow(top_next, 2);
+            }
+            /*
+            Console.WriteLine("===========================");
+            Console.WriteLine("Order:");
+            for (int i = 0; i < order_list.Count; i++)
+            {
+                Console.WriteLine((int)order_list[i]);
+            }
+            */
+            Shell32.Shell shell = new Shell32.Shell();
+            // fix reference: right click project, Add > Reference; in COM, check on Microsoft Shell Controls and Automation
+            List<int> win_list = new List<int>();
+            foreach (SHDocVw.InternetExplorer window in shell.Windows())
+            {
+                win_list.Add(window.HWND);
+            }
+            /*
+            Console.WriteLine("===========================");
+            Console.WriteLine("win:");
+            for (int i = 0; i < win_list.Count; i++)
+            {
+                Console.WriteLine(win_list[i]);
+            }
+            */
+            // top most explorer
+            int top_explorer = 0;
+            for (int i = 0; i < order_list.Count; i++)
+            {
+                if (win_list.Contains((int)order_list[i])) {
+                    top_explorer = (int)order_list[i];
+                    break;
+                }
+            }
+            List<string> selected = new List<string>();
+            foreach (SHDocVw.InternetExplorer window in shell.Windows())
+            {
+                // fix SHDocVw: right click project, Add > Reference; in COM, check on Microsoft Internet Controls
+                if (window.HWND == top_explorer)
+                {
+                    Shell32.FolderItems items = ((Shell32.IShellFolderViewDual2)window.Document).SelectedItems();
+                    foreach (Shell32.FolderItem item in items)
+                    {
+                        selected.Add(item.Path);
+                        Console.WriteLine(item.Path);
+                    }
+                }
+            }
+            Console.WriteLine("# By Shining Ying. - 2022/05/01");
+            //return (string.Join(", ", selected.ToArray()));
+        }
+    }
+}
+</code>