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PORun the command for a ProgId verb
 

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    <p>Is there a way to execute the command for a progid verb without having to go digging in the registry and doing string manipulation?</p> <p>Using ShObjIdl.idl I can run the following command to get the ProgId for the default browser:</p> <pre><code>var reg = new ShellObjects.ApplicationAssociationRegistration(); string progID; reg.QueryCurrentDefault("http", ShellObjects.ASSOCIATIONTYPE.AT_URLPROTOCOL, ShellObjects.ASSOCIATIONLEVEL.AL_EFFECTIVE, out progID); </code></pre> <p>This gives me "ChromeHTML.FHXQEQDDJYXVQSFWM2SVMV5GNA". In the registry I can see this progid has the following shell/open/command:</p> <pre><code>"C:\Users\Paul\AppData\Local\Google\Chrome\Application\chrome.exe" -- "%1" </code></pre> <p>Is there an API that I can pass the ProgId to, along with the verb and argument and it will run it?</p> <p>One route I went down is using ShellExecuteEx:</p> <pre><code>var shellExecuteInfo = new SHELLEXECUTEINFO(); shellExecuteInfo.cbSize = Marshal.SizeOf(shellExecuteInfo); shellExecuteInfo.fMask = SEE_MASK_CLASSNAME; shellExecuteInfo.hwnd = IntPtr.Zero; shellExecuteInfo.lpVerb = "open"; shellExecuteInfo.lpFile = "google.com"; shellExecuteInfo.nShow = SW_SHOWNORMAL; shellExecuteInfo.lpClass = "http"; ShellExecuteEx(ref shellExecuteInfo); </code></pre> <p>However this fails with a 'Windows cannot find' error due to Window's doing checking on lpFile which I don't want to happen as it isn't relevant for a URL (from: <a href="http://blogs.msdn.com/b/oldnewthing/archive/2010/07/01/10033224.aspx" rel="nofollow">http://blogs.msdn.com/b/oldnewthing/archive/2010/07/01/10033224.aspx</a> )</p> <hr> <p>This is the solution I have come up with:</p> <pre><code> private static void Main(string[] args) { if (!OpenUrlInDefaultBrowser("google.com")) Console.WriteLine("An error happened"); } [DllImport("Shlwapi.dll")] private static extern int AssocQueryString(ASSOCF flags, ASSOCSTR str, string pszAssoc, string pszExtra, StringBuilder pszOut, ref uint pcchOut); private enum ASSOCF { ASSOCF_NONE = 0x00000000 } private enum ASSOCSTR { ASSOCSTR_COMMAND = 1 } [DllImport("Shell32.dll", CharSet=CharSet.Auto)] private static extern int SHEvaluateSystemCommandTemplate(string pszCmdTemplate, out string ppszApplication, out string ppszCommandLine, out string ppszParameters); private static bool OpenUrlInDefaultBrowser(string url) { string browserProgId; if (!GetDefaultBrowserProgId(out browserProgId)) return false; string browserCommandTemplate; if (!GetCommandTemplate(browserProgId, out browserCommandTemplate)) return false; string browserExecutable; string parameters; if (!EvaluateCommandTemplate(browserCommandTemplate, out browserExecutable, out parameters)) return false; parameters = ReplaceSubstitutionParameters(parameters, url); try { Process.Start(browserExecutable, parameters); } catch (InvalidOperationException) { return false; } catch (Win32Exception) { return false; } catch (FileNotFoundException) { return false; } return true; } private static bool GetDefaultBrowserProgId(out string defaultBrowserProgId) { try { // midl "C:\Program Files (x86)\Windows Kits\8.0\Include\um\ShObjIdl.idl" // tlbimp ShObjIdl.tlb var applicationAssociationRegistration = new ApplicationAssociationRegistration(); applicationAssociationRegistration.QueryCurrentDefault("http", ShellObjects.ASSOCIATIONTYPE.AT_URLPROTOCOL, ShellObjects.ASSOCIATIONLEVEL.AL_EFFECTIVE, out defaultBrowserProgId); } catch (COMException) { defaultBrowserProgId = null; return false; } return !string.IsNullOrEmpty(defaultBrowserProgId); } private static bool GetCommandTemplate(string defaultBrowserProgId, out string commandTemplate) { var commandTemplateBufferSize = 0U; AssocQueryString(ASSOCF.ASSOCF_NONE, ASSOCSTR.ASSOCSTR_COMMAND, defaultBrowserProgId, "open", null, ref commandTemplateBufferSize); var commandTemplateStringBuilder = new StringBuilder((int)commandTemplateBufferSize); var hresult = AssocQueryString(ASSOCF.ASSOCF_NONE, ASSOCSTR.ASSOCSTR_COMMAND, defaultBrowserProgId, "open", commandTemplateStringBuilder, ref commandTemplateBufferSize); commandTemplate = commandTemplateStringBuilder.ToString(); return hresult == 0 &amp;&amp; !string.IsNullOrEmpty(commandTemplate); } private static bool EvaluateCommandTemplate(string commandTemplate, out string application, out string parameters) { string commandLine; var hresult = SHEvaluateSystemCommandTemplate(commandTemplate, out application, out commandLine, out parameters); return hresult == 0 &amp;&amp; !string.IsNullOrEmpty(application) &amp;&amp; !string.IsNullOrEmpty(parameters); } private static string ReplaceSubstitutionParameters(string parameters, string replacement) { // Not perfect but good enough for this purpose return parameters.Replace("%L", replacement) .Replace("%l", replacement) .Replace("%1", replacement); } </code></pre>
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    1. USPaul
    1. USPaul
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    2. VO
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    1. COhttp is not a class. It is a protocol.
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      1. USRaymond Chen
    2. COI don't follow, MSDN indicates lpClass on SHELLEXECUTEINFO is also used accept protocols e.g. http. Is there another more suitable API for executing command's on ProgIds?
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      1. USPaul
 

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