Problem while pinvoke setupdigetclassimageindex

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i want to pinvoke

SetupDiGetClassImageIndex

SetupDiGetClassImageIndex function | Microsoft Docs[^]

but it is always returning false, plz help,
what iam doing wrong ?

What I have tried:

[StructLayout(LayoutKind.Sequential)]
       public struct SP_CLASSIMAGELIST_DATA
       {
           public uint cbSize;
           public IntPtr HIMAGELIST;
           public IntPtr Reserved;
       }

[DllImport("Setupapi.dll", SetLastError = true, CharSet = CharSet.Auto)]
        internal static extern bool SetupDiGetClassImageIndex(SP_CLASSIMAGELIST_DATA ClassImageListData, Guid ClassGuid,ref int ImageIndex);

string strGuid="myguid";
SP_CLASSIMAGELIST_DATA m_ImageListData = new SP_CLASSIMAGELIST_DATA();
            bool success = false;
            int ClassImage = 0;
            Guid ClassGuid = new Guid(strGuid);
            
            m_ImageListData.cbSize = (uint)Marshal.SizeOf(typeof(SP_CLASSIMAGELIST_DATA));
            success = SetupDiGetClassImageIndex(m_ImageListData, ClassGuid,ref ClassImage);

Posted 13-Jul-18 1:21am

srilekhamenon

Updated 13-Jul-18 2:25am

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Jochen Arndt · Accepted Answer · 2018-07-13T02:25:00

Solution 1

Call GetLastError() when the function fails. The error code might help finding out what is wrong. I guess it is invalid parameter here.

Note that all parameters of the API function are pointers. So it should be probably (not tested):

C#

[DllImport("Setupapi.dll", SetLastError = true, CharSet = CharSet.Auto)]
        internal static extern bool SetupDiGetClassImageIndex(ref SP_CLASSIMAGELIST_DATA ClassImageListData, Guid ClassGuid, ref int ImageIndex);

The conversion of the C# Guid to the C GUID structure pointer should be AFAIK done by P/Invoke automatically.

Your GUID is hopefully valid because otherwise an exception would be thrown by the Guid() constructor.

Posted 13-Jul-18 2:25am

Jochen Arndt

Comments

srilekhamenon 13-Jul-18 8:28am

getlasterror() function is giving error code 1784, The supplied user buffer is not valid for the requested operation.

Jochen Arndt 13-Jul-18 8:39am

That refers probably to the PSP_CLASSIMAGELIST_DATA parameter because the function checks the cbSize member.

Did you tried specifying ref (also at the final call)?

srilekhamenon 13-Jul-18 9:00am

yes sir i had passed SP_CLASSIMAGELIST_DATA as ref but still problem did not solve

Jochen Arndt 13-Jul-18 9:31am

All I can suggest is trying ref also for the Guid and specifying ImageIndex as out.

Is it a 64-bit or 32-bit application?
Depending on that it might be necessary to add a Pack parameter to the StructLayout (8 for 64 bit and 1 or 4 for 32 bit as used in the setupapi.h file).

srilekhamenon 13-Jul-18 9:39am

applications target platform is x86 and my system is 64 bit system

srilekhamenon 16-Jul-18 2:38am

problem solved, thanks