Verify Installation of a custom device using C#

March 9, 2010

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Hi all,

Using my WinUSB C# component, I also needed to automatically install the driver if it is not already installed. The INF file defines a new device class by its GUID. This means that the class does not exist on the machine if the device is not installed.

Here is the code:

[DllImport(“setupapi.dll”, SetLastError = true, CharSet = CharSet.Auto)]
internal static extern bool SetupDiGetClassDescription(ref Guid ClassGuid,
StringBuilder classDescription, Int32 ClassDescriptionSize, ref UInt32 RequiredSize);

public static bool IsDeviceClassInstalled(string deviceClassGuid)
   return (IsDeviceClassInstalled(new Guid(deviceClassGuid)));

public static bool IsDeviceClassInstalled(Guid deviceClassGuid)
   StringBuilder deviceClassDescription = new StringBuilder(256);
   UInt32 retLength = 0;
   SetupDiGetClassDescription(ref deviceClassGuid, deviceClassDescription, deviceClassDescription.Capacity, ref retLength);
   return (deviceClassDescription.Length > 0);

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