.net - How can I find out what is wrong with a SetupDiGetClassDev interface in C#? -

Has it been wrong with the device's information set? I am writing again my code again and I'm still stalking the same one.

  deviceInfoSet = SetupDiGetClassDevs (reference tGuid, 0, IntPtr.Zero, (uint) SetupDiFlags.DIGCF_PRESENT); If (deviceInfoSet.ToInt32 () == INVALID_DEVICE_HANDLE) {int errCode = Marshal.GetLastWin32Error (); Error Message = New Win32Exception (Marshal.GetLastWin32Error ()). message; StatusLabel.Text + = "Invalid deviceinfoset returned:" + errCode + "= & gt;" + Error message + "."; ";}  

There is no error in the above code, but when I use the code below:

  result = true; while (Results ) {result = SetupDiEnumDeviceInterfaces (deviceInfoSet, IntPtr.Zero, referee tGuid, index, ref anInterface); if (! result) {int errCode = Marshal.GetLastWin32Error (); error message = new Win32Exception (Marshal.GetLastWin32Error ()). message ; statusLabel.Text + = "\ nSetDiEnumDeviceInterface error:", "." + errCode + "= & gt" + errorMessage +; break;} index ++;} try  

And device information set list, use of error code 259 C to ( is no more data is available ). I think I'm at a loss as wrong what is.

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Are you sure you are using the correct GUID?

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Edit: Everything else Some books look perfect and do the right thing.

Edit2: Try SetupDiGetClassDevs in call with DIGCF_DEVICEINTERFACE, and see that it works for you. That is, both DIGCF_PRESENT and DIGCF_DEVICEINTERFACE.

Edit 3: For 64-bit Issue (@TES), check out