pinvoke.net: Edit: setupapi.SetupFindNextMatchLine

@msdn=http://msdn2.microsoft.com/en-us/library/aa377202(VS.85).aspx
@pinvoke=http://pinvoke.net/$$$.htm

Summary: returns the location of the next line in an INF file relative to ContextIn.Line that matches a specified key.

!!!!C# Signature:
 [DllImport("setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
 public static extern bool SetupFindNextMatchLine(ref INFCONTEXT ContextIn, [MarshalAs(UnmanagedType.LPTStr)] string Key, out INFCONTEXT ContextOut);
!!!!VB Signature:
 Public Declare Auto Function SetupFindNextMatchLine Lib "setupapi.dll" (ByRef ContextIn As INFCONTEXT, ByVal Key As String, ByRef ContextOut As INFCONTEXT) As Boolean
!!!!User-Defined Types:
[INFCONTEXT]

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

!!!!Notes:
Parameters
||ContextIn || Pointer to the INF file context retrieved by a call to the SetupFindFirstLine function.||
|| Key || If this optional parameter is specified, it supplies a key to match. This parameter should be a null-terminated string. This parameter can be Null. If Key is not specified, the SetupFindNextMatchLine function is equivalent to the SetupFindNextLine function.||
||ContextOut || Pointer to a variable in which this function returns the context of the found line. ContextOut can point to ContextIn if the caller wishes.||

Return Value
The function returns a nonzero value if it finds a matching line. Otherwise, the return value is zero. To get extended error information, call GetLastError.

!!!!Tips & Tricks:
If ContextIn.Inf references multiple INF files that have been appended together using SetupOpenAppendInfFile, the SetupFindNextMatchLine function searches across the specified section in all files referenced by the HINF to locate the next matching line.

!!!!Sample Code:
C#
 string infFile = <INF file full path>;
 uint ErrorLine = 0;
 IntPtr infHandle = SetupOpenInfFile(infFile, null, INF_STYLE_OLDNT | INF_STYLE_WIN4, out ErrorLine);
 int iCode = Marshal.GetLastWin32Error();
 if (infHandle.ToInt64() != INVALID_HANDLE_VALUE)
 {
     Console.WriteLine("INF file was opened successfully.");
     INFCONTEXT Context = new INFCONTEXT();
     if (SetupFindFirstLine(infHandle, "Manufacturer", null, ref Context) == true)
     {
 		Console.WriteLine("Manufacturers list (which match the specific key):");
 		string manufacturerName = "";
 		manufacturerName = manufacturerName.PadLeft(256, ' ');
 		Int32 requiredSize = manufacturerName.Length;
 		while(SetupFindNextMatchLine(ref Context, <key to search>, out Context) == true)
 		{
 			manufacturerName = manufacturerName.PadLeft(256, ' ');
 			requiredSize = manufacturerName.Length;
 			SetupGetStringField(ref Context, 1, manufacturerName, manufacturerName.Length, out requiredSize);
			manufacturerName = manufacturerName.Substring(0, requiredSize - 1);
 			Console.WriteLine(manufacturerName);
 		}
     }
     else
     {
		Console.WriteLine("Can't find [Manufacturer] section.");
     }
     SetupCloseInfFile(infHandle);
 }
 else
 {
     Console.WriteLine("Failed to open INF file. Error code - {0}.", iCode);
     if (ErrorLine != 0)
     {
 		Console.WriteLine("Failure line - {0}.", ErrorLine);
     }
 }
VB
 Dim infFile As String = <INF file full path>
 Dim ErrorLine As UInt32 = 0
 Dim infHandle As IntPtr = SetupOpenInfFile(infFile, Nothing, INF_STYLE_OLDNT Or INF_STYLE_WIN4, ErrorLine)
 Dim iCode As Integer = Marshal.GetLastWin32Error()
 If infHandle.ToInt64() <> INVALID_HANDLE_VALUE Then
 	Console.WriteLine("INF file was opened successfully.")
 	Dim Context As INFCONTEXT = New INFCONTEXT()
 	If SetupFindFirstLine(infHandle, "Manufacturer", Nothing, Context) = True Then
 		Console.WriteLine("Manufacturers list (which match the specific key):")
 		Dim manufacturerName As String = ""
 		manufacturerName = manufacturerName.PadLeft(256, " "c)
 		Dim requiredSize As Int32 = manufacturerName.Length
 		While SetupFindNextMatchLine(Context, <key to search>, Context) = True
 			SetupGetStringField(Context, 1, manufacturerName, manufacturerName.Length, requiredSize)
 			manufacturerName = manufacturerName.Substring(0, requiredSize - 1)
 			Console.WriteLine(manufacturerName)
 		End While
 	Else
 		Console.WriteLine("Can't find [Manufacturer] section.")
 	End If
 	SetupCloseInfFile(infHandle)
 Else
 	Console.WriteLine("Failed to open INF file. Error code - {0}.", iCode)
 	If ErrorLine <> 0 Then
 		Console.WriteLine("Failure line - {0}.", ErrorLine)
 	End If
 End If

Documentation: SetupFindNextMatchLine@msdn on MSDN