Based on VS2012 software, C#programming language. Use the win32 API monitoring the printer status, and output the imformation to the comobox

PrintSpooler
............\Backup
............\......\PrintQueueMonitor
............\......\.................\PrintQueueMonitor.cs
............\......\.................\PrintQueueMonitor.csproj
............\......\.................\PrintSpoolAPI.cs
............\......\.................\Properties
............\......\.................\..........\AssemblyInfo.cs
............\......\PrintSpooler
............\......\............\MainForm.Designer.cs
............\......\............\MainForm.cs
............\......\............\MainForm.resx
............\......\............\PrintSpooler.csproj
............\......\............\PrintSpooler.csproj.user
............\......\............\Program.cs
............\......\............\Properties
............\......\............\..........\AssemblyInfo.cs
............\......\............\..........\Resources.Designer.cs
............\......\............\..........\Resources.resx
............\......\............\..........\Settings.Designer.cs
............\......\............\..........\Settings.settings
............\......\PrintSpooler.sln
............\PrintQueueMonitor
............\.................\PrintQueueMonitor.cs
............\.................\PrintQueueMonitor.csproj
............\.................\PrintSpoolAPI.cs
............\.................\Properties
............\.................\..........\AssemblyInfo.cs
............\.................\bin
............\.................\...\Debug
............\.................\...\.....\PrintQueueMonitor.dll
............\.................\...\.....\PrintQueueMonitor.pdb
............\.................\...\Release
............\.................\...\.......\PrintQueueMonitor.dll
............\.................\obj
............\.................\...\Debug
............\.................\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
............\.................\...\.....\PrintQueueMonitor.csproj.FileListAbsolute.txt
............\.................\...\.....\PrintQueueMonitor.dll
............\.................\...\.....\PrintQueueMonitor.pdb
............\.................\...\.....\TempPE
............\PrintSpooler
............\............\MainForm.Designer.cs
............\............\MainForm.cs
............\............\MainForm.resx
............\............\PrintSpooler.csproj
............\............\PrintSpooler.csproj.user
............\............\Program.cs
............\............\Properties
............\............\..........\AssemblyInfo.cs
............\............\..........\Resources.Designer.cs
............\............\..........\Resources.resx
............\............\..........\Settings.Designer.cs
............\............\..........\Settings.settings
............\............\bin
............\............\...\Debug
............\............\...\.....\PrintQueueMonitor.dll
............\............\...\.....\PrintQueueMonitor.pdb
............\............\...\.....\PrintSpooler.exe
............\............\...\.....\PrintSpooler.pdb
............\............\...\.....\PrintSpooler.vshost.exe
............\............\...\.....\PrintSpooler.vshost.exe.manifest
............\............\...\Release
............\............\...\.......\PrintQueueMonitor.dll
............\............\...\.......\PrintSpooler.exe
............\............\obj
............\............\...\Debug
............\............\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
............\............\...\.....\PrintSpooler.MainForm.resources
............\............\...\.....\PrintSpooler.Properties.Resources.resources
............\............\...\.....\PrintSpooler.csproj.FileListAbsolute.txt
............\............\...\.....\PrintSpooler.csproj.GenerateResource.Cache
............\............\...\.....\PrintSpooler.csprojResolveAssemblyReference.cache
............\............\...\.....\PrintSpooler.exe
............\............\...\.....\PrintSpooler.pdb
............\............\...\.....\TempPE
............\PrintSpooler.sln
............\PrintSpooler.v11.suo
............\UpgradeLog.XML
............\UpgradeLog.htm
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