Fix the Clipboard read error, issue #9

.gitignore

@@ -1,35 +1,72 @@
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
 
 # User-specific files
 *.suo
 *.user
+*.userosscache
 *.sln.docstates
 
-# Build results
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
 
+# Build results
 [Dd]ebug/
+[Dd]ebugPublic/
 [Rr]elease/
+[Rr]eleases/
 x64/
-build/
+x86/
+bld/
 [Bb]in/
 [Oo]bj/
-.nuget/
+[Ll]og/
+
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
 
-# Enable "build/" folder in the NuGet Packages folder since NuGet packages use it for MSBuild targets
-!packages/*/build/
+# Visual Studio 2017 auto generated files
+Generated\ Files/
 
 # MSTest test Results
 [Tt]est[Rr]esult*/
 [Bb]uild[Ll]og.*
 
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
 *_i.c
 *_p.c
+*_i.h
 *.ilk
 *.meta
 *.obj
+*.iobj
 *.pch
 *.pdb
+*.ipdb
 *.pgc
 *.pgd
 *.rsp
@@ -44,38 +81,71 @@ build/
 *.vssscc
 .builds
 *.pidb
-*.log
+*.svclog
 *.scc
 
+# Chutzpah Test files
+_Chutzpah*
+
 # Visual C++ cache files
 ipch/
 *.aps
 *.ncb
+*.opendb
 *.opensdf
 *.sdf
 *.cachefile
+*.VC.db
+*.VC.VC.opendb
 
 # Visual Studio profiler
 *.psess
 *.vsp
 *.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+$tf/
 
 # Guidance Automation Toolkit
 *.gpState
 
 # ReSharper is a .NET coding add-in
 _ReSharper*/
 *.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
 
 # TeamCity is a build add-in
 _TeamCity*
 
 # DotCover is a Code Coverage Tool
 *.dotCover
 
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
 # NCrunch
-*.ncrunch*
+_NCrunch_*
 .*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
 
 # Installshield output folder
 [Ee]xpress/
@@ -94,64 +164,166 @@ DocProject/Help/html
 publish/
 
 # Publish Web Output
-*.Publish.xml
+*.[Pp]ublish.xml
+*.azurePubxml
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
 
-# NuGet Packages Directory
-## TODO: If you have NuGet Package Restore enabled, uncomment the next line
-#packages/
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
 
-# Windows Azure Build Output
-csx
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/[Pp]ackages/*
+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
 *.build.csdef
 
-# Windows Store app package directory
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
 AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+*.appx
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
 
 # Others
-sql/
-*.Cache
 ClientBin/
-[Ss]tyle[Cc]op.*
 ~$*
 *~
 *.dbmdl
-*.[Pp]ublish.xml
+*.dbproj.schemaview
+*.jfm
 *.pfx
 *.publishsettings
+orleans.codegen.cs
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
 
 # RIA/Silverlight projects
 Generated_Code/
 
-# Backup & report files from converting an old project file to a newer
-# Visual Studio version. Backup files are not needed, because we have git ;-)
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
 _UpgradeReport_Files/
 Backup*/
 UpgradeLog*.XML
 UpgradeLog*.htm
+ServiceFabricBackup/
+*.rptproj.bak
 
 # SQL Server files
-App_Data/*.mdf
-App_Data/*.ldf
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+*.rptproj.rsuser
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
 
+# Telerik's JustMock configuration file
+*.jmconfig
 
-#LightSwitch generated files
-GeneratedArtifacts/
-_Pvt_Extensions/
-ModelManifest.xml
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
 
-# =========================
-# Windows detritus
-# =========================
+# OpenCover UI analysis results
+OpenCover/
 
-# Windows image file caches
-Thumbs.db
-ehthumbs.db
+# Azure Stream Analytics local run output
+ASALocalRun/
 
-# Folder config file
-Desktop.ini
+# MSBuild Binary and Structured Log
+*.binlog
 
-# Recycle Bin used on file shares
-$RECYCLE.BIN/
+# NVidia Nsight GPU debugger configuration file
+*.nvuser
 
-# Mac desktop service store files
-.DS_Store
+# MFractors (Xamarin productivity tool) working folder
+.mfractor/

ClipboardMonitor.cs

@@ -117,26 +117,35 @@ protected override void WndProc(ref Message m)
 
             private void ClipChanged()
             {
-                IDataObject iData = System.Windows.Forms.Clipboard.GetDataObject();
-
+                IDataObject iData = null;
                 ClipboardFormat? format = null;
 
-                foreach (var f in formats)
+                try
                 {
-                    if (iData.GetDataPresent(f))
+                    iData = System.Windows.Forms.Clipboard.GetDataObject();
+
+                    foreach (var f in formats)
                     {
-                        format = (ClipboardFormat)Enum.Parse(typeof(ClipboardFormat), f);
-                        break;
+                        if (iData.GetDataPresent(f))
+                        {
+                            format = (ClipboardFormat)Enum.Parse(typeof(ClipboardFormat), f);
+                            break;
+                        }
                     }
-                }
 
-                object data = iData.GetData(format.ToString());
+                    object data = iData.GetData(format.ToString());
 
-                if (data == null || format == null)
-                    return;
+                    if (data == null || format == null)
+                        return;
 
-                if (OnClipboardChange != null)
-                    OnClipboardChange((ClipboardFormat)format, data);
+                    if (OnClipboardChange != null)
+                        OnClipboardChange((ClipboardFormat)format, data);
+                }
+                catch (ExternalException ex)
+                {
+                    // The internal implements will raise the ExternalExcption 
+                    // when the clipboard is being used by the another process.
+                }
             }