private static extern HRESULT AssocQueryString(
AssocF flags,
AssocStr str,
string pszAssoc,
string pszExtra,
[Out] StringBuilder pszOut,
ref uint pcchOut);
internal static extern uint AssocQueryString(
AssocF flags,
AssocStr str,
string pszAssoc,
string pszExtra,
[Out] StringBuilder pszOut,
[In][Out] ref uint pcchOut);
/*
*
* AssocStr str
* File name extension
* A file name extension, such as .txt.
*
* CLSID
* A CLSID GUID in the standard "{GUID}" format.
*
* ProgID
* An application's ProgID, such as Word.Document.8.
*
* Executable name
* The name of an application's .exe file. The ASSOCF_OPEN_BYEXENAME flag must be set in flags.
*/
private static string GetAssociation(AssocF assocF, AssocStr assocStr, string doctype, string pszExtra = null)
{
try
{
uint pcchOut = 0; // size of output buffer
// First call is to get the required size of output buffer
AssocQueryString(assocF, assocStr, doctype, pszExtra, null, ref pcchOut);
if (pcchOut == 0)
{
return(String.Empty);
}
var pszOut = new StringBuilder((int)pcchOut); // Allocate the output buffer
AssocQueryString(assocF, assocStr, doctype, pszExtra, pszOut, ref pcchOut); // Get the full pathname to the program in pszOut
string doc = pszOut.ToString();
return(doc);
}
catch (Exception exception)
{
Logger.Warn(exception);
return(null);
}
}
/// <summary>
/// Retrieves a file association for a particular extension
/// From Ohad Schneider <see cref="!:https://stackoverflow.com/a/17773402"/>
/// </summary>
/// <param name="associationFlags">Any flags which need to be set in order to retrieve the association</param>
/// <param name="associationType">The type of association which should be retrieved</param>
/// <param name="fileExtension">The file association which we will use to determine the association</param>
/// <returns></returns>
private static string GetFileAssociation(AssocF associationFlags, AssocStr associationType, string fileExtension)
{
uint bufferSize = 0;
uint returnedStatus = FileInvoker.AssocQueryString(associationFlags, associationType, fileExtension, null,
null, ref bufferSize);
const int successWithLength = 1;
if (returnedStatus != successWithLength)
{
throw new NoAssociationFoundException(
$"Could not determine the required buffer size required for the file association {associationType} and file extension {fileExtension}",
fileExtension);
}
StringBuilder stringBuilder = new StringBuilder((int)bufferSize);
returnedStatus = FileInvoker.AssocQueryString(associationFlags, associationType, fileExtension, null,
stringBuilder, ref bufferSize);
const int successWithAssociation = 0;
if (returnedStatus != successWithAssociation)
{
throw new NoAssociationFoundException(
$"Could not determine a string for the file association {associationType} and file extension {fileExtension}",
fileExtension);
}
return(stringBuilder.ToString());
}
static extern uint AssocQueryString(
AssocF flags,
AssocStr str,
string pszAssoc,
string pszExtra,
[Out] StringBuilder pszOut,
[In][Out] ref uint pcchOut);
public static extern uint AssocQueryString(
AssocF flags,
AssocStr str,
[MarshalAs(UnmanagedType.LPWStr)] string pszAssoc,
[MarshalAs(UnmanagedType.LPWStr)] string pszExtra,
[MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszOut,
ref uint pcchOut
);
public static string AssocQueryString(AssocF assocF, AssocStr association, string assocString)
{
var length = 0u;
var queryResult = AssocQueryString(assocF, association, assocString, null, null, ref length);
if (queryResult != 1)
{
return(null);
}
var builder = new StringBuilder((int)length);
queryResult = AssocQueryString(assocF, association, assocString, null, builder, ref length);
return(queryResult == 0 ? builder.ToString() : null);
}
internal static string AssocQueryString(AssocF assocF, AssocStr association, string assocString)
{
uint length = 0;
uint ret = AssocQueryString(assocF, association, assocString, null, null, ref length);
if (ret != 1) //expected S_FALSE
{
return null;
//throw new InvalidOperationException("Could not determine associated string");
}
var sb = new StringBuilder((int) length); //(length-1) will probably work too as null termination is added
ret = AssocQueryString(assocF, association, assocString, null, sb, ref length);
if (ret != 0) //expected S_OK
{
return null;
//throw new InvalidOperationException("Could not determine associated string");
}
return sb.ToString();
}
private static extern uint AssocQueryString(AssocF flags, AssocStr str, string pszAssoc, string pszExtra,
[Out] StringBuilder sOut, [In][Out] ref uint nOut);
private static extern uint AssocQueryKey(AssocF flags, AssocKey key, string pszAssoc, string pszExtra,
[Out] out UIntPtr phkeyOut);
public static string GetAssociation(AssocF assocF, AssocStr assocStr, string doctype)
{
try
{
uint pcchOut = 0; // size of output buffer
// First call is to get the required size of output buffer
AssocQueryString(assocF, assocStr, doctype, null, null, ref pcchOut);
if (pcchOut == 0)
{
return String.Empty;
}
// Allocate the output buffer
var pszOut = new StringBuilder((int)pcchOut);
// Get the full pathname to the program in pszOut
AssocQueryString(assocF, assocStr, doctype, null, pszOut, ref pcchOut);
string doc = pszOut.ToString();
return doc;
}
catch (Exception exception)
{
Log.Error(exception);
return null;
}
}
public static string GetAssoc(string pszAssoc , AssocF flags, AssocStr str)
{
uint pcchOut = 0;
AssocQueryString(flags, str, pszAssoc, null, null, ref pcchOut);
StringBuilder pszOut = new StringBuilder((int)pcchOut);
AssocQueryString(flags, str, pszAssoc, null, pszOut, ref pcchOut);
return pszOut.ToString();
}
private static extern uint AssocQueryString(AssocF flags, AssocStr str, string extension, string pszExtra, [Out] StringBuilder pszOut, ref uint pcchOut);
