 | | | HID devices alternative ? | HID devices alternative ? 2003-11-27 - By Geoff Stahl
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Top of my head, you need to add IOKit framework to either the framework
you create or to the project.
On Nov 27, 2003, at 12:17 AM, Alexander Repenning wrote:
> This code was of great help and worked well when creating a C, Carbon
> application interfacing with gamePads etc. Unfortunately, using a
> different programming language, I cannot create a complete C + Carbon
> application but need to wrap the HIDUtility access code below up into
> either a bundle or framework. This is causing an error when trying to
> call any of the HID functions:
>
> gameDeviceInput:0:
> /Users/alex/Projects/gameDeviceInput/
> libHIDUtilities.a(HID_Utilities.o) illegal reference to symbol:
> _IODestroyPlugInInterface defined in indirectly referenced dynamic
> library /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
>
> The code is the same. All I changed is to create a framework instead
> of an application. I am probably just missing a stupid little
> detail.. on the other hand could it be that there is some conceptual
> reason why code using the HIDUtilities cannot be turned into a
> framework?
>
> any clues would be appreciated.
>
>
> Alex
>
>
>
>
> At 9:50 AM -0600 11/4/03, Wade Williams wrote:
>> On Nov 4, 2003, at 1:19 AM, Patrice Krysztofiak wrote:
>>> I did, i wasted a complete day on that code, I'm just clueless to
>>> even how to use it, it's far too complicated for a simple gamepad. (
>>> and for my brain )
>>>
>>> I'm looking for someone to help, so far the few people who contacted
>>> me have the same problem :(
>>>
>>> patrice.
>>> ps :Apple dev team : please make an RHID ( Real Human Interface
>>> Device ) API for USB :)
>>>
>>
>> In a general sense, there's nothing wrong with the HID Utilities
>> code. (I say in a general sense because I know those with complex
>> needs have things they'd like it to do different/better)
>>
>> What is wrong from your point of view is that there's no real
>> documentation, so to read the headers and sample code and figure it
>> out assumes you have some experience.
>>
>> So, with that said, let's try to make it as easy as possible.
>>
>> 1) Download the HID Utilities sample code.
>>
>> 2) Double-click the HID Utilities slib.pbproj file to open it in
>> Project Builder.
>>
>> 3) Click build. This will create a build folder that will contain
>> libHIDUtilities.a once it's finished building. (Actually building it
>> may not be necessary, but it doesn't hurt.)
>>
>> 4) Add libHIDUtilities.a to your project.
>>
>> 5) Add #include "HID_Utilities_External.h" and #include
>> <Kernel/IOKit/hidsystem/IOHIDUsageTables.h>
>> to your joystick code file.
>>
>> 6) Build a list of devices by doing:
>>
>> HIDBuildDeviceList( NULL, NULL );
>>
>> if (! HIDHaveDeviceList() )
>> return NULL;
>>
>> num_devices = HIDCountDevices();
>>
>> 7) Loop through the devices, looking for the one you're interested
>> in. You find it by matching its usage and usagePage. For example,
>> for a game pad, you'd look for a usagePage of kHIDPage_GenericDesktop
>> and a usage of kHIDUsage_GD_GamePad. (All this stuff is found in
>> IOHIDUsageTables.h)
>>
>>
>> pRecDevice deviceCandidate = NULL, *stored_device[100 ];
>> int i, foundDevices = 0;
>>
>> deviceCandidate = HIDGetFirstDevice();
>>
>> i = 0;
>> while ( i < num_devices )
>> {
>> if ( deviceCandidate )
>> {
>> //here I filter out keyboards, mice and totally unrelated devices
>> if ( (deviceCandidate->usage == kHIDUsage_GD_Keyboard)
>> || (deviceCandidate->usagePage != kHIDPage_GenericDesktop) ||
>> (deviceCandidate->usage == kHIDUsage_GD_Mouse) )
>> {
>> if ( HIDIsValidDevice( deviceCandidate ) )
>> {
>> //skip this one and just go on to the next one
>> deviceCandidate = HIDGetNextDevice( deviceCandidate );
>> }
>> else
>> {
>> //handle error
>> }
>> }
>> else
>> {
>> if ( HIDIsValidDevice( deviceCandidate ) )
>> {
>> //store the device in a list of devices we're interested in
>> stored_device[foundDevices] = deviceCandidate;
>> deviceCandidate = HIDGetNextDevice( deviceCandidate );
>> foundDevices++;
>> }
>> else
>> {
>> //handle error
>> }
>>
>>
>> }
>>
>> i++;
>> }
>> }
>>
>> 8) Now that you've got the device, go through its elements and find
>> the axis or button you're interested in:
>>
>> if ( HIDIsValidDevice( device ) )
>> {
>> elRec=HIDGetFirstDeviceElement( js_devices[id].device,
>> kHIDElementTypeInput );
>> if ( elRec )
>> {
>>
>> switch (elRec->usagePage)
>> {
>> case kHIDPage_GenericDesktop:
>> switch ( elRec->usage )
>> {
>> case kHIDUsage_GD_X:
>> x_axis = elRec;
>> break;
>> case kHIDUsage_GD_Y:
>> y_axis = elRec;
>> break;
>> case kHIDUsage_GD_GamePad:
>> pad = elRec;
>> break;
>> //etc
>> }
>> }
>>
>> //if the right element was not found, continue looping through the
>> rest of the elements by calling HIDGetNextDeviceElement() until you
>> //find the right one or it returns NULL
>> }
>>
>> 9) Now that you've got the actual element, you can query it's value:
>>
>> if ( HIDIsValidElement( devicePtr, elementPtr ) )
>> {
>> value = HIDGetElementValue(devicePtr, elementPtr);
>> }
>>
>> I hope this helps.
>>
>> Wade
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>
>
> --
> Prof. Alexander Repenning
> University of Colorado
> Department of Computer Science and
> Center of LifeLong Learning & Design
> Campus Box 430
> Boulder, CO 80309-0430
> __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ___
> mailto:ralex@(protected) phone: (303) 492-1349
> http://www.cs.colorado.edu/~ralex/ fax: (303) 492-2844
> __ ____ ____ ____ ____ ____ ____ ____ ____ ____
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>
---
Geoff Stahl
3D Software Engineer
Apple
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