C# Signature:
[DllImport("Shlwapi.dll", SetLastError=true, CharSet = CharSet.Auto)]
static extern uint AssocQueryString(AssocF flags, AssocStr str, string pszAssoc, string pszExtra,
[Out] StringBuilder pszOut, [In][Out] ref uint pcchOut);
VB Signature:
<DllImport("Shlwapi.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Function AssocQueryString(ByVal flags As UInteger, ByVal str As UInteger, ByVal pszAssoc As String, _
ByVal pszExtra As String, ByVal pszOut As Text.StringBuilder, ByRef pcchOut As UInteger) As UInteger
End Function
User-Defined Types:
[Flags]
enum AssocF
{
None = 0,
Init_NoRemapCLSID = 0x1,
Init_ByExeName = 0x2,
Open_ByExeName = 0x2,
Init_DefaultToStar = 0x4,
Init_DefaultToFolder = 0x8,
NoUserSettings = 0x10,
NoTruncate = 0x20,
Verify = 0x40,
RemapRunDll = 0x80,
NoFixUps = 0x100,
IgnoreBaseClass = 0x200,
Init_IgnoreUnknown = 0x400,
Init_FixedProgId = 0x800,
IsProtocol = 0x1000,
InitForFile = 0x2000,
}
enum AssocStr
{
Command = 1,
Executable,
FriendlyDocName,
FriendlyAppName,
NoOpen,
ShellNewValue,
DDECommand,
DDEIfExec,
DDEApplication,
DDETopic,
InfoTip,
QuickTip,
TileInfo,
ContentType,
DefaultIcon,
ShellExtension,
DropTarget,
DelegateExecute,
SupportedUriProtocols,
Max,
}
Alternative Managed API:
Do you know one? Please contribute it!
Notes:
None.
Tips & Tricks:
Please add some!
Sample Code:
public string GetAssociation(string doctype)
{
uint pcchOut = 0; // size of output buffer
// First call is to get the required size of output buffer
AssocQueryString(AssocF.Verify, AssocStr.Executable, doctype, null, null, ref pcchOut);
if (pcchOut == 0)
{
return String.Empty;
}
// Allocate the output buffer
StringBuilder pszOut = new StringBuilder((int)pcchOut);
// Get the full pathname to the program in pszOut
AssocQueryString(AssocF.Verify, AssocStr.Executable, doctype, null, pszOut, ref pcchOut);
string doc = pszOut.ToString();
return doc;
}
