pinvoke.net: Edit: msi.MsiEnumPathesEx

@msdn=http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msi/setup/msienumpatchesex.asp
@pinvoke=http://pinvoke.net/$$$.htm

Summary: Enumarates PatchCodes of all patches installed above specified product, even if this patches was superseded or obsolete.

!!!!C# Signature:
		[DllImport("msi.dll", EntryPoint="MsiEnumPatchesExW",
			 CharSet=CharSet.Unicode, ExactSpelling=true,
			 CallingConvention=CallingConvention.StdCall)]
		private static extern uint MsiEnumPatchesEx(string szProductCode,
			string szUserSid,
			uint dwContext,
			uint dwFilter,
			uint dwIndex,
			StringBuilder szPatchCode,
			StringBuilder szTargetProductCode,
			out object pdwTargetProductContext,
			StringBuilder szTargetUserSid,
			ref uint pcchTargetUserSid);
!!!!VB Signature:
 Declare Function MsiEnumPatchesEx Lib "msi.dll" (TODO) As TODO
!!!!User-Defined Types:
        public enum MSIINSTALLCONTEXT
        {
            MSIINSTALLCONTEXT_NONE          =   0,
            MSIINSTALLCONTEXT_USERMANAGED   =   1,
            MSIINSTALLCONTEXT_USERUNMANAGED =   2,
            MSIINSTALLCONTEXT_MACHINE       =   4,
            MSIINSTALLCONTEXT_ALL           = (MSIINSTALLCONTEXT_USERMANAGED | MSIINSTALLCONTEXT_USERUNMANAGED | MSIINSTALLCONTEXT_MACHINE),
        }

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

!!!!Notes:
This function is available starting with Windows Installer version 3.0.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:

using WindowsInstaller;

// Get all patches of per-machine installed product
	public  static  StringCollection getAllPatches(String productCode)
	{
		StringCollection retList = new StringCollection();
		Installer installer = (Installer)new WindowsInstaller();
		if (new Version(installer.Version) < new Version("3.0"))
		{
			StringList patchCodes = installer.get_Patches(productCode);
			if (patchCodes != null)
				foreach(string patchCode in patchCodes)
				{
					retList.Add(patchCode);
				}
		}
		else
		{
			StringBuilder szPatchCode = new StringBuilder(40);
			StringBuilder szTargetProductCode = new StringBuilder(40);
			StringBuilder szTargetUserSid = new StringBuilder(300);
			uint pcchTargetUserSid = 300;
			object junk = null;
			for (uint i = 0; ; i++)
			{
				uint res = MsiEnumPatchesEx(
					productCode, // Product code. Method enumerate only patches which applyed to specified product
					null, // User SID. null needs if context == MachineContext only (4), it means to use only per-machine installations
					4, // Installation context. 4 means MachineContext only.
					7, // Filter bitmask. 7 means to search applyed, superseded and obsolete
					i, // iterator
					szPatchCode, // Return value of currently found PatchCode
					szTargetProductCode,  // Equals to ProductCode
					out junk, 
					szTargetUserSid, // User SID. Indicate owner of this installation. (Here is null)
					ref pcchTargetUserSid // Length of user SID
				);
				if (res == 0)
					retList.Add(szPatchCode.ToString());
				else
					break;
			}
		}
		return retList;
	}

Documentation: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msi/setup/msienumpatchesex.asp