@msdn=http://msdn.microsoft.com/en-us/library/ms790916.aspx @pinvoke=http://pinvoke.net/$$$.htm Summary: The routine releases the resources that the HID class driver allocated to hold a top-level collection's preparsed data. !!!!C# Signature: [DllImport("hid.dll", SetLastError=true)] static extern Boolean HidD_FreePreparsedData(IntPtr PreparsedData); !!!!VB Signature: Declare Function HidD_FreePreparsedData Lib "hid.dll" (ByRef PreparsedData As Integer) As Boolean !!!!User-Defined Types: None. !!!!Alternative Managed API: Do you know one? Please contribute it! !!!!Notes: '''Return Value''' - Returns TRUE if the routine succeeds. Otherwise, it returns FALSE if the buffer was not a preparsed data buffer. !!!!Tips & Tricks: Please add some! !!!!Sample Code: '''Code In C#:''' internal HIDP_CAPS GetDeviceCapabilities( SafeFileHandle hidHandle ) { Byte[] preparsedDataBytes = new Byte[ 30 ]; String preparsedDataString = null; IntPtr preparsedDataPointer = new System.IntPtr(); Int32 result = 0; Boolean success = false; Byte[] valueCaps = new Byte[ 1024 ]; // (the array size is a guess) try { success = HidD_GetPreparsedData( hidHandle, ref preparsedDataPointer ); // Copy the data at PreparsedDataPointer into a byte array. preparsedDataString = Convert.ToBase64String( preparsedDataBytes ); result = HidP_GetCaps( preparsedDataPointer, ref Capabilities ); if ( ( result != 0 ) ) { result = HidP_GetValueCaps(HidP_Input, ref valueCaps[0], ref Capabilities.NumberInputValueCaps, preparsedDataPointer); success = HidD_FreePreparsedData( ref preparsedDataPointer ); } } catch ( Exception ex ) { DisplayException( MODULE_NAME, ex ); throw ; } return Capabilities; } Documentation: HidD_FreePreparsedData@msdn on MSDN
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