Resolving SDL Keycodes to Windows Keycodes

R0b0t1 · August 1, 2018, 6:44pm

Hello,

I am using FreeRDP. I try to take scancodes as reported by SDL2

From the FreeRDP source it seems that the “scancodes” may actually be
the virtual key constants:

FreeRDP/FreeRDP/blob/master/include/freerdp/scancode.h

/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * RDP protocol "scancodes"
 *
 * Copyright 2009-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef FREERDP_LOCALE_KEYBOARD_RDP_SCANCODE_H

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Is anyone aware of a way to resolve SDL2 keys to the ones FreeRDP and
I Windows uses?

E.g. “,” turns into “z”, see:

physical: M; scancode: 16, keysym: 109
physical: ,; scancode: 54, keysym: 44
physical: C; scancode: 6, keysym: 99
physical: Z; scancode: 29, keysym: 122
physical: .; scancode: 55, keysym: 46

printf("physical: %s; scancode: %d, keysym: %d\n",
                    SDL_GetScancodeName(event.key.keysym.scancode),
                    event.key.keysym.scancode,
                    SDL_GetKeyFromScancode(event.key.keysym.scancode)
                );

Cheers,
R0b0t1

Daniel_Gibson · August 1, 2018, 7:45pm

In case those are scancodes after all (and the values seem to match the DIK_* scancodes from DirectInput), I’ve got a table that matches SDL scancodes to those DIK scancodes: https://github.com/DanielGibson/Snippets/blob/master/sdl2_scancode_to_dinput.h