//

// GhostscriptVersionInfo.cs

// This file is part of Ghostscript.NET library

//

// Author: Josip Habjan (habjan@gmail.com, http://www.linkedin.com/in/habjan)

// Copyright (c) 2013-2016 by Josip Habjan. All rights reserved.

//

// Permission is hereby granted, free of charge, to any person obtaining

// a copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to

// permit persons to whom the Software is furnished to do so, subject to

// the following conditions:

//

// The above copyright notice and this permission notice shall be

// included in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

using System;

using System.Collections.Generic;

using Microsoft.Win32;

namespace Ghostscript.NET

{

/// <summary>

/// Represents a Ghostscript version information.

/// </summary>

public class GhostscriptVersionInfo

{

#region Private local variables

private Version _version;

private string _dllPath;

private string _libPath;

private GhostscriptLicense _licenseType;

#endregion

#region Constructor

/// <summary>

/// Initializes a new instance of the Ghostscript.NET.GhostscriptVersionInfo class.

/// </summary>

/// <param name="version">Ghostscript version.</param>

/// <param name="dllPath">Ghostscript native library path.</param>

/// <param name="libPath">Ghostscript lib path.</param>

/// <param name="licenseType">Ghostscript license type.</param>

public GhostscriptVersionInfo(Version version, string dllPath, string libPath, GhostscriptLicense licenseType)

{

_version = version;

_dllPath = dllPath;

_libPath = libPath;

_licenseType = licenseType;

}

#endregion

public GhostscriptVersionInfo(string customDllPath)

{

_version = new Version();

_dllPath = customDllPath;

_libPath = string.Empty;

_licenseType = GhostscriptLicense.GPL;

}

#region Version

/// <summary>

/// Gets Ghostscript version.

/// </summary>

public Version Version

{

get { return _version; }

}

#endregion

#region DllPath

/// <summary>

/// Gets Ghostscript native library path.

/// </summary>

public string DllPath

{

get { return _dllPath; }

}

#endregion

#region LibPath

/// <summary>

/// Gets Ghostscrip lib path.

/// </summary>

public string LibPath

{

get { return _libPath; }

}

#endregion

#region LicenseType

/// <summary>

/// Gets Ghostscript license type.

/// </summary>

public GhostscriptLicense LicenseType

{

get { return _licenseType; }

}

#endregion

#region ToString

/// <summary>

/// Returns GhostscriptVersionInfo string.

/// </summary>

public override string ToString()

{

return string.Format("Licence: {0}, Version: {1}, Dll: {2}, Lib: {3}", _licenseType, _version, _dllPath, _libPath);

}

#endregion

#region GetInstalledVersions

/// <summary>

/// Gets installed Ghostscript versions list.

/// </summary>

public static List<GhostscriptVersionInfo> GetInstalledVersions()

{

return GetInstalledVersions(GhostscriptLicense.GPL | GhostscriptLicense.AFPL | GhostscriptLicense.Artifex);

}

#endregion

#region GetInstalledVersions

/// <summary>

/// Gets installed Ghostscript versions list.

/// </summary>

/// <returns>A GhostscriptVersionInfo list of the Ghostscript installations found on the local system.</returns>

public static List<GhostscriptVersionInfo> GetInstalledVersions(GhostscriptLicense licenseType)

{

// create a search list instance

List<GhostscriptLicense> licenses = new List<GhostscriptLicense>();

// check if we need to search for AFPL installations

if ((licenseType & GhostscriptLicense.AFPL) == GhostscriptLicense.AFPL)

{

// yep, add this license in the search list

licenses.Add(GhostscriptLicense.AFPL);

}

// check if we need to search for GPL installations

if ((licenseType & GhostscriptLicense.GPL) == GhostscriptLicense.GPL)

{

// yep, add this license in the search list

licenses.Add(GhostscriptLicense.GPL);

}

// check if we need to search for GPL installations

if ((licenseType & GhostscriptLicense.Artifex) == GhostscriptLicense.Artifex)

{

// yep, add this license in the search list

licenses.Add(GhostscriptLicense.Artifex);

}

// create new return list instance

List<GhostscriptVersionInfo> versions = new List<GhostscriptVersionInfo>();

// loop through the search list

foreach (GhostscriptLicense license in licenses)

{

RegistryKey hklm = null;

RegistryKey rkGs = null;

// check if we are running in 64 bit process

if (Environment.Is64BitProcess)

{

// user 64 bit registry key

hklm = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64);

}

else

{

// user 32 bit registry key

hklm = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32);

}

// check the license type

if (license == GhostscriptLicense.AFPL)

{

// get the AFPL registry key

rkGs = hklm.OpenSubKey("SOFTWARE\\AFPL Ghostscript\\");

}

else if (license == GhostscriptLicense.GPL)

{

// get the GPL registry key

rkGs = hklm.OpenSubKey("SOFTWARE\\GPL Ghostscript\\");

}

else if (license == GhostscriptLicense.Artifex)

{

rkGs = hklm.OpenSubKey("SOFTWARE\\Artifex Ghostscript\\");

}

// check if we found the registry key

if (rkGs != null)

{

// get this registry key sub-keys

// each sub-key represents a version of the installed Ghostscript library

string[] subkeys = rkGs.GetSubKeyNames();

// loop through all sub-keys

for (int index = 0; index < subkeys.Length; index++)

{

// get the subkey / Ghostscript library version

string versionKey = subkeys[index];

try

{

// open the sub key

RegistryKey rkVer = rkGs.OpenSubKey(versionKey);

// get the Ghostscript native library path

string gsdll = rkVer.GetValue("GS_DLL", string.Empty) as string;

// get the Ghostscript lib path

string gslib = rkVer.GetValue("GS_LIB", string.Empty) as string;

bool compatibile = false;

// check if we can use this dll in this process

if (System.Environment.Is64BitProcess && gsdll.Contains("gsdll64.dll"))

{

// both process and dll are 64 bit, we can use it

compatibile = true;

}

else if (!System.Environment.Is64BitProcess && gsdll.Contains("gsdll32.dll"))

{

// both process and dll are 32 bit, we can use it

compatibile = true;

}

if (compatibile)

{

// put this version in the return list

versions.Add(new GhostscriptVersionInfo(new Version(versionKey), gsdll, gslib, license));

}

}

catch { }

}

}

}

return versions;

}

#endregion

#region GetLastInstalledVersion

/// <summary>

/// Gets top installed Ghostscript version.

/// </summary>

public static GhostscriptVersionInfo GetLastInstalledVersion()

{

return GetLastInstalledVersion(GhostscriptLicense.GPL | GhostscriptLicense.AFPL | GhostscriptLicense.Artifex, GhostscriptLicense.GPL);

}

#endregion

#region GetLastInstalledVersion

/// <summary>

/// Gets top installed Ghostscript version.

/// </summary>

/// <param name="licenseType">Serch for the specific Ghostscript version based on the Ghostscript license.</param>

/// <param name="licensePriority">If there are both license types installed, which one should have the prilorty.</param>

/// <returns>GhostscriptVersionInfo object of the last installed Ghostscript version based on priority license.</returns>

public static GhostscriptVersionInfo GetLastInstalledVersion(GhostscriptLicense licenseType, GhostscriptLicense licensePriority)

{

// gets installed Ghostscript versions list

List<GhostscriptVersionInfo> gsVerList = GetInstalledVersions(licenseType);

// cache the list count

int versionsCount = gsVerList.Count;

// check if there is only 1 version of the Ghostscript installed

// if yes, then we don't need a deeper search

if (versionsCount == 1)

{

// simply return the first one

return gsVerList[0];

}

else if (versionsCount > 1)

{

// get the first one

GhostscriptVersionInfo lastGsVer = gsVerList[0];

// loop through all others

for (int index = 1; index < versionsCount; index++)

{

// get one from the list

GhostscriptVersionInfo gs = gsVerList[index];

// compare if it's a newer version

if (gs.Version > lastGsVer.Version)

{

// check if this version has license with larger priority

if (gs.LicenseType == licensePriority)

{

// set top version

lastGsVer = gsVerList[index];

}

}

}

// return top GhostscriptVersionInfo instance

return lastGsVer;

}

// inform the user that we didn't find Ghostscript installed on this system

throw new GhostscriptLibraryNotInstalledException();

}

#endregion

#region IsGhostscriptInstalled

/// <summary>

/// Gets if the Ghostscript is installed on the local system.

/// </summary>

public static bool IsGhostscriptInstalled

{

get

{

// check for any, GPL or AFPL version

return GetInstalledVersions(GhostscriptLicense.GPL | GhostscriptLicense.AFPL | GhostscriptLicense.Artifex).Count > 0;

}

}

#endregion

}

}