Returns Wrong Parameter Error for PInvoke Call,..

[=?iso-8859-1?B?S2VyZW0gR/xtcvxrY/w=?=]

Hi,

i get a "Wrong Parameter" from Marshal.GetLast Win32Error() on using this:
[StructLayout(La youtKind.Sequen tial)]
public class SP_DEVINFO_DATA
{
public int cbSize;
public Guid classGuid;
public int devInst;
public ulong reserved;
};

[StructLayout(La youtKind.Sequen tial,CharSet=Ch arSet.Unicode)]
internal class SP_DRVINFO_DATA
{
public System.UInt32 cbSize;
public System.UInt32 DriverType;
public System.IntPtr Reserved;

[MarshalAs(Unman agedType.ByValT Str, SizeConst = 256)]
public System.String Description;
[MarshalAs(Unman agedType.ByValT Str, SizeConst = 256)]
public System.String MfgName;
[MarshalAs(Unman agedType.ByValT Str, SizeConst = 256)]
public System.String ProviderName;
public System.Runtime. InteropServices .ComTypes.FILET IME
DriverDate;
public System.UInt64 DriverVersion;
}

[DllImport("setu papi.dll", CharSet = CharSet.Unicode , SetLastError =
true)]
private static extern bool SetupDiGetSelec tedDriver
(
System.IntPtr DeviceInfoSet,
[In]ref SP_DEVINFO_DATA DeviceInfoData,
[Out]out SP_DRVINFO_DATA DriverInfoData
);

The "DeviceInfo Set" and "DeviceInfoData " of the Call are valid,
but something goes wrong while marshalling data between the
managed and unmanaged border. Something must be wrong
with my declarations,.. ...but what? I am certain, that it is some
stuff on the "SP_DRVINFO_DAT A",...any ideas?

TIA,...

Regards

Kerem

--
-----------------------
Beste Grüsse / Best regards / Votre bien devoue
Kerem Gümrükcü
Latest Project: http://www.codeplex.com/restarts
Latest Open-Source Projects: http://entwicklung.junetz.de
-----------------------
"This reply is provided as is, without warranty express or implied."

[Pavel Minaev]

On Aug 11, 7:01*am, Kerem Gümrükcü <kareem...@hotm ail.comwrote:

Hi,

i get a "Wrong Parameter" from Marshal.GetLast Win32Error() on using this:

* * * * [StructLayout(La youtKind.Sequen tial)]
* * * * public class SP_DEVINFO_DATA
* * * * {
* * * * * * public int cbSize;
* * * * * * public Guid classGuid;
* * * * * * public int devInst;
* * * * * * public ulong reserved;

Why do you use "ulong" for "reserved" here? It's ULONG_PTR in the API
declaration, and, unless you're on x64, this is equivalent to
"unsigned long", which is uint in C#, not ulong. Though in this case,
to remain 64-bit clean, it's best to just use UIntPtr.

Anyway, assuming you used Marshal.SizeOf( ) to set cbSize, you've got a
wrong size in it with your declaration - perhaps it is the reason.