C# Signature:

[DllImport("setupapi.dll")]

static extern int CM_Get_Device_ID_List_Size(ref uint idListlen, int dnDevInst, uint ulFlags);

VB Signature:

Declare Function CM_Get_Device_ID_List_Size Lib "setupapi.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

const ulong CM_GETIDLIST_FILTER_PRESENT = 0x00000100;

uint idListLen = 0;

string filter = null;

List<string> deviceInstanceIdStrs = new List<string>();

int cmRet = CM_Get_Device_ID_List_Size(ref idListLen, 0, (uint)CM_GETIDLIST_FILTER_PRESENT);

if (0 == cmRet)

{

    byte[] data = new byte[idListLen];
    cmRet = CM_Get_Device_ID_List(filter, data, idListLen, (uint)CM_GETIDLIST_FILTER_PRESENT);
    if (0 == cmRet)
    {
    deviceInstanceIdStrs = BytesToStrings(data);
    }

}

return deviceInstanceIdStrs;

///--------------------------------------------------------------------

/// <summary>

/// Converts a buffer of raw bytes into a list of strings

/// </summary>

/// <param name="rawData">

/// Buffer of raw data

/// </param>

/// <returns>

/// The list of strings extracted from the buffer

/// </returns>

///--------------------------------------------------------------------

public List<string> BytesToStrings(byte[] rawData)

{

    int limit = rawData.Length;     // Set Max
    int idx = 0;
    List<string> strings = new List<string>();
    bool processing = (idx < limit);

    while (processing)
    {
    int begx = idx;
    while (begx < limit && 0 != rawData[begx])
    {
        ++begx;
    }

    if (begx < limit)
    {
        int sz = (begx - idx);
        byte[] bytes = new byte[sz];
        Array.Copy(rawData, idx, bytes, 0, sz);
        try
        {
        string str = Encoding.Default.GetString(bytes);
        if (!string.IsNullOrEmpty(str.Trim()))
        {
            strings.Add(str);
        }
        idx = begx + 1;
        processing = (idx < limit);
        }
        catch (Exception e)
        {
        // Not sure what to do here...
        Console.WriteLine(e);
        processing = false;
        }
    }
    }

    return strings;

}

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