The free function doesn't need to be replicated. The malloc would be replaced by code that would force the corrent number of occurrences into the array. Just set a value into the last occurrence.

Hi Roland,



I'm waking up this discussion because I have a requirement to distinguish whether input is coming from the keyboard or a usb bar code scanner. Windows doesn't provide this insight to the Key event but an App can get it from the RawInputDeviceApi



I wondering if you have some insight into this HID (human interface device) API



This article has a c# example https://www.codeproject.com/Articles/17123/Using-Raw-Input-from-C-to-handle-multiple-keyboard



Based on this MS definition:

https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-rawinputdevice

I created this structure

global type rawinputdevice from structure

uint usUsagePage

uint usUsage

ulong dwFlags

ulong hwndTarget

end type



To get started : Based on your suggestion above I added these two external function definitions



//Calling this function causes a system error -- wrong type for param 1 ??

function UINT GetRawInputDeviceList_size( long usize , ref UINT puiNumDevices, ref UINT cbSize) library 'user32.dll'



//Calling this function returns -1 ??

function UINT GetRawInputDeviceList( ref RAWINPUTDEVICE pRawInputDevices [ ] , ref UINT puiNumDevices, ref UINT cbSize) library 'user32.dll'



Here's the PB code (button click)

RAWINPUTDEVICE str_RawInputDevices_null ,str_RawInputDevices [ ]

UINT lui_NumDevices, lui_cbSize

int rc

//setnull (str_RAWINPUTDEVICEs_null) // compiler won't allow this

//long lsize

//setnull(lsize)

//GetRawInputDeviceList( lsize , lui_NumDevices, lui_cbSize) //<<causes system error

rc = GetRawInputDeviceList( str_RawInputDevices , lui_NumDevices, lui_cbSize)



Suggestion?



Thanks



Yakov

yakov.werde@iongroup.com

I've never actually used those functions. I based my comments off what I got from the Microsoft documentation.



Check your data types here:

https://docs.microsoft.com/en-us/windows/win32/winprog/windows-data-types?redirectedfrom=MSDN



Handles (HWND for example) should be Longptr so that it will work in 64bit.