DirectInput, detecting alt-tab
Author
Hiyas,
I am trying to toggle fullscreen in my game when the user hits
alt-tab, however I cannot find an ascii code for alt anywhere.
how would I do this? I can also use DirectInput key codes but don''t have a chart for them. it would be diks[index].
Thanx,
Christopher
Here is my snippet:
// Read the Keyboard
pInput->ReadKeyboard();
// If escape is pressed exit the game
if(pInput->ascKeys[27])
PostQuitMessage(0);
// If alt-tab swtich toggle full screen
if(pInput->ascKeys[??] && pInput->ascKeys[??])
pDisplay->ToggleFullscreen();
// Draw the scene
pDisplay->DrawGLScene();
Not answering your question I''m afraid, but over-riding alt-tab is not a good thing to do.
Tradition for toggling full screen is alt-enter. Its in tonnes of demos if you look for some source. I think it might even be in the code that the DirectX 8.1 new project wizard makes, so take a look (in the MsgProc obviously).
Here is the function I made in VB that returns the keyname, it might help you understand what some of the DISTATE values are.
[Edit: Please use the source tag so people don't have to scroll too much. Thanks.]
[edited by - Oluseyi on September 9, 2002 9:15:43 PM]
Public Function GetKeyName(ByVal iNum As Integer) As String Dim aKeys(255) As String, A As Integer If iNum > 255 Then iNum = 0 For A = 0 To 255 aKeys(A) = "{~" & CStr(A) & "}" Next A aKeys(&H1) = "ESCAPE" aKeys(&H2) = "1" aKeys(&H3) = "2" aKeys(&H4) = "3" aKeys(&H5) = "4" aKeys(&H6) = "5" aKeys(&H7) = "6" aKeys(&H8) = "7" aKeys(&H9) = "8" aKeys(&HA) = "9" aKeys(&HB) = "0" aKeys(&HC) = "-" ' - on main keyboard aKeys(&HD) = "=" aKeys(&HE) = "{BACK}" ' backspace aKeys(&HF) = "{TAB}" aKeys(&H10) = "Q" aKeys(&H11) = "W" aKeys(&H12) = "E" aKeys(&H13) = "R" aKeys(&H14) = "T" aKeys(&H15) = "Y" aKeys(&H16) = "U" aKeys(&H17) = "I" aKeys(&H18) = "O" aKeys(&H19) = "P" aKeys(&H1A) = "[" aKeys(&H1B) = "]" aKeys(&H1C) = "{ENTER}" ' Enter on main keyboard aKeys(&H1D) = "{LCTRL}" aKeys(&H1E) = "A" aKeys(&H1F) = "S" aKeys(&H20) = "D" aKeys(&H21) = "F" aKeys(&H22) = "G" aKeys(&H23) = "H" aKeys(&H24) = "J" aKeys(&H25) = "K" aKeys(&H26) = "L" aKeys(&H27) = ";" aKeys(&H28) = "'" aKeys(&H29) = "`" ' accent grave aKeys(&H2A) = "{LSHIFT}" aKeys(&H2B) = "\" aKeys(&H2C) = "Z" aKeys(&H2D) = "X" aKeys(&H2E) = "C" aKeys(&H2F) = "V" aKeys(&H30) = "B" aKeys(&H31) = "N" aKeys(&H32) = "M" aKeys(&H33) = "," aKeys(&H34) = "." ' . on main keyboard aKeys(&H35) = "/" ' / on main keyboard aKeys(&H36) = "{RSHIFT}" aKeys(&H37) = "*" ' * on numeric keypad aKeys(&H38) = "{LALT}" ' left Alt aKeys(&H39) = " " aKeys(&H3A) = "{CAPSLOCK}" aKeys(&H3B) = "{F1}" aKeys(&H3C) = "{F2}" aKeys(&H3D) = "{F3}" aKeys(&H3E) = "{F4}" aKeys(&H3F) = "{F5}" aKeys(&H40) = "{F6}" aKeys(&H41) = "{F7}" aKeys(&H42) = "{F8}" aKeys(&H43) = "{F9}" aKeys(&H44) = "{F10}" aKeys(&H45) = "{NUMLOCK}" aKeys(&H46) = "{SCROLL}" ' Scroll Lock aKeys(&H47) = "7" ' num pads aKeys(&H48) = "8" aKeys(&H49) = "9" aKeys(&H4A) = "-" ' - on numeric keypad aKeys(&H4B) = "4" aKeys(&H4C) = "5" aKeys(&H4D) = "6" aKeys(&H4E) = "+" ' + on numeric keypad aKeys(&H4F) = "1" aKeys(&H50) = "2" aKeys(&H51) = "3" aKeys(&H52) = "0" aKeys(&H53) = "." ' . on numeric keypad aKeys(&H56) = "{OEM_102}" ' German KBD? aKeys(&H57) = "{F11}" aKeys(&H58) = "{F12}" aKeys(&H64) = "{F13}" ' NEC PC98? aKeys(&H65) = "{F14}" aKeys(&H66) = "{F15}" aKeys(&H70) = "{KANA}" ' JAP KBD ? aKeys(&H73) = "?" ' {ABNT_C1} ? on Portugese (Brazilian) keyboards aKeys(&H79) = "{CONVERT}" ' on (Japanese keyboard)? aKeys(&H7B) = "{NOCONVERT}|" ' on (Japanese keyboard) aKeys(&H7D) = "{YEN}" ' Jap aKeys(&H7E) = "." ' {ABNT_C2} on Numpad . on Portugese (Brazilian) keyboards aKeys(&H8D) = "=" ' NUMPADEQUALS = on numeric keypad (NEC PC98) aKeys(&H90) = "{PREVTRACK}" ' on Previous Track (CIRCUMFLEX on Japanese keyboard) aKeys(&H91) = "@" ' AT (NEC PC98) aKeys(&H92) = ":" ' COLON (NEC PC98) " aKeys(&H93) = "_" ' (NEC PC98) " aKeys(&H94) = "{KANJI}" ' KANJI on (Japanese keyboard)" aKeys(&H95) = "{STOP}" ' (NEC PC98) " aKeys(&H96) = "{AX}" ' (Japan AX) " aKeys(&H97) = "{J3100}" ' Unlabeled aKeys(&H99) = "{NEXTTRACK}" ' Next Track aKeys(&H9C) = "{ENTER}" ' Enter on numeric keypad aKeys(&H9D) = "{RCONTROL}" aKeys(&HA0) = "{MUTE}" ' Mute aKeys(&HA1) = "{CALCULATOR}" ' Calculator aKeys(&HA2) = "{PLAYPAUSE}" ' Play / Pause aKeys(&HA4) = "{MEDIASTOP}" ' Media Stop aKeys(&HAE) = "{VOLUMEDOWN}" ' Volume - aKeys(&HB0) = "{VOLUMEUP}" ' Volume + aKeys(&HB2) = "{WEBHOME}" ' Web home aKeys(&HB3) = "," ' , on numeric keypad (NEC PC98) aKeys(&HB5) = "/" ' / on numeric keypad aKeys(&HB7) = "{PrintScreen}" aKeys(&HB8) = "{RALT}" ' right Alt aKeys(&HC5) = "{PAUSE}" ' Pause aKeys(&HC7) = "{HOME}" ' Home on arrow keypad aKeys(&HC8) = "{UP}" ' UpArrow on arrow keypad aKeys(&HC9) = "{PageUp}" ' PgUp on arrow keypad aKeys(&HCB) = "{LEFT}" ' LeftArrow on arrow keypad aKeys(&HCD) = "{RIGHT}" ' RightArrow on arrow keypad aKeys(&HCF) = "{END}" ' End on arrow keypad aKeys(&HD0) = "{DOWN}" ' DownArrow on arrow keypad aKeys(&HD1) = "{PageDown}" ' PgDn on arrow keypad aKeys(&HD2) = "{INSERT}" ' Insert on arrow keypad aKeys(&HD3) = "{DELETE}" ' Delete on arrow keypad aKeys(&HDB) = "{LWIN}" ' Left Windows key aKeys(&HDC) = "{RWIN}" ' Right Windows key aKeys(&HDD) = "{START}" ' AppMenu key aKeys(&HDE) = "{POWER}" ' System Power aKeys(&HDF) = "{SLEEP}" ' System Sleep aKeys(&HE3) = "{WAKE}" ' System Wake aKeys(&HE5) = "{WEBSEARCH}" ' Web Search aKeys(&HE6) = "{WEBFAVORITES}" ' Web Favorites aKeys(&HE7) = "{WEBREFRESH}" ' Web Refresh aKeys(&HE8) = "{WEBSTOP}" ' Web Stop aKeys(&HE9) = "{WEBFORWARD}" ' Web Forward aKeys(&HEA) = "{WEBBACK}" ' Web Back aKeys(&HEB) = "{MYCOMPUTER}" ' My Computer aKeys(&HEC) = "{MAIL}" ' Mail aKeys(&HED) = "{MEDIASELECT}" ' Media Select GetKeyName = aKeys(iNum)End Function [Edit: Please use the source tag so people don't have to scroll too much. Thanks.]
[edited by - Oluseyi on September 9, 2002 9:15:43 PM]
To see the DirectInput key codes, just open up dinput.h or download the documentation. The codes are...
DIK_LALT
DIK_RALT
It doesn''t make sense to be using ASCII values with DirectInput.
DIK_LALT
DIK_RALT
It doesn''t make sense to be using ASCII values with DirectInput.
Author
Ok I can accept that. So say I want to use alt-enter, I still have no way of detecting the alt key 
Another problem arose while I was playing with my code. It
seems that as soon as I implement DirectInput without having any kind of code doing anything to process keystrokes I cannot alt-tab in my program anyway,default behavior or not,it gives me an invalid page fault. I have no idea why since I have put error handling everywhere I can think of. Any ideas on that?
As an after thought perhaps alt is triggering a code > 255 and thus trying to change the value of my arrays out of bounds since they are declared as 255 elements? I shall play around some more.
[Edit: GDNet tags use square brackets - [] - not angular ones. That's why you didn't get the desired effect.]
[edited by - Oluseyi on September 9, 2002 9:16:36 PM]
Another problem arose while I was playing with my code. It
seems that as soon as I implement DirectInput without having any kind of code doing anything to process keystrokes I cannot alt-tab in my program anyway,default behavior or not,it gives me an invalid page fault. I have no idea why since I have put error handling everywhere I can think of. Any ideas on that?
As an after thought perhaps alt is triggering a code > 255 and thus trying to change the value of my arrays out of bounds since they are declared as 255 elements? I shall play around some more.
#ifndef INPUTSYSTEM_H#define INPUTSYSTEM_H//--------------------------------------------------------------------// InputSystem.h// // Declaration of the Input Processing Functions for the application //// Christopher Pisz// 04/08/02//--------------------------------------------------------------------#define DIRECTINPUT_VERSION 0x0800#include <windows.h> // Windows API#include <dinput.h> // DirectInput Library #define INPUTERROR_NODI 0x8100001 // No device error#define INPUTERROR_NOKEYBOARD 0x8100002 // No keyboard error#define KEYBOARD_BUFFERSIZE 10 // Keyboard buffer sizeclass InputSystem{ public: BYTE diks[256]; // DInput Scan Codes BYTE ascKeys[256]; // DInput Ascii Codes InputSystem(); ~InputSystem(); HRESULT InitDirectInput(HWND hWnd); // Initialize Direct Input HRESULT ReadKeyboard(); // Read the Keyboard private: LPDIRECTINPUT8 pDI; // Pointer to DInput Interface LPDIRECTINPUTDEVICE8 pKeyboard; // Pointer to DInput Keyboard Device HKL layout; // Keyboard Layout};#endif INPUTSYSTEM_H//--------------------------------------------------------------------// InputSystem.cpp// // Implementation of the Input Processing Functions for the application //// Christopher Pisz// 04/08/02//--------------------------------------------------------------------#include "InputSystem.h"//--------------------------------------------------------------------// InputSystem//--------------------------------------------------------------------InputSystem::InputSystem(){ // Initialize variables pDI =NULL; // Pointer to Device Interface pKeyboard =NULL; // Pointer to keyboard device // Set both key code arrays to all zeros (keys are up) ZeroMemory(ascKeys,sizeof(ascKeys)); ZeroMemory(diks,sizeof(diks));}InputSystem::~InputSystem(){ // Release the Keyboard Device if(pKeyboard) { pKeyboard->Unacquire(); pKeyboard->Release(); } // Release The DirectInput Device Interface if(pDI) pDI->Release();}//---------------------------------------------------------------------// Initialize Direct Input//---------------------------------------------------------------------HRESULT InputSystem::InitDirectInput(HWND hWnd){ DIPROPDWORD dipw; // Create a DirectInput Interface if(!pDI) { if(FAILED(DirectInput8Create(GetModuleHandle(NULL),DIRECTINPUT_VERSION, IID_IDirectInput8,(void**)&pDI,NULL))) return INPUTERROR_NODI; } // Get the keyboard layout layout=GetKeyboardLayout(0); // Obtain an interface to the system keyboard device if(FAILED(pDI->CreateDevice(GUID_SysKeyboard,&pKeyboard,NULL))) return INPUTERROR_NOKEYBOARD; // Create buffer to hold the keyboard data ZeroMemory(&dipw,sizeof(DIPROPDWORD)); dipw.diph.dwSize =sizeof(DIPROPDWORD); dipw.diph.dwHeaderSize =sizeof(DIPROPHEADER); dipw.diph.dwObj =0; dipw.diph.dwHow =DIPH_DEVICE; dipw.dwData =10; // Set the size of the buffer if(FAILED(pKeyboard->SetProperty(DIPROP_BUFFERSIZE,&dipw.diph))) return INPUTERROR_NOKEYBOARD; // Set the format of the keyboard if(FAILED(pKeyboard->SetDataFormat(&c_dfDIKeyboard))) return INPUTERROR_NOKEYBOARD; // Set the cooperative level to exclusive access if(FAILED(pKeyboard->SetCooperativeLevel(hWnd,DISCL_EXCLUSIVE | DISCL_FOREGROUND))) return INPUTERROR_NOKEYBOARD; // Aquire the keyboard device pKeyboard->Acquire(); return S_OK;}//---------------------------------------------------------------------// Read the Keyboard//---------------------------------------------------------------------HRESULT InputSystem::ReadKeyboard(){ DWORD dwCurBuffer; DIDEVICEOBJECTDATA didKeyboardBuffer[KEYBOARD_BUFFERSIZE]; DWORD dwItems=KEYBOARD_BUFFERSIZE; BYTE byteASCII; // Don't try to read the keyboard if the device is invalid if(!pKeyboard || !pDI) return INPUTERROR_NOKEYBOARD; // Read the buffered data pKeyboard->GetDeviceData(sizeof(DIDEVICEOBJECTDATA), didKeyboardBuffer,&dwItems,0); // Process data if there is data to read if(dwItems) { for(dwCurBuffer=0;dwCurBuffer<dwItems;dwCurBuffer++) { // Map scan-code to ASCII code byteASCII=MapVirtualKeyEx(didKeyboardBuffer[dwCurBuffer].dwOfs, 1,layout); // Set key to be down (pressed) if(didKeyboardBuffer[dwCurBuffer].dwData & 0x80) { ascKeys[byteASCII]=1; diks[didKeyboardBuffer[dwCurBuffer].dwOfs]=1; } // Set Key to be up else { ascKeys[byteASCII]=0; diks[didKeyboardBuffer[dwCurBuffer].dwOfs]=0; } } } return S_OK;} [Edit: GDNet tags use square brackets - [] - not angular ones. That's why you didn't get the desired effect.]
[edited by - Oluseyi on September 9, 2002 9:16:36 PM]
quote:Original post by brekehan
Hiyas,
I am trying to toggle fullscreen in my game when the user hits
alt-tab, however I cannot find an ascii code for alt anywhere.
how would I do this?
The alt+tab combination generates the Windows message WM_ACTIVATE. Simply handle that inside your WndProc.
Author
Ok all is well. I appreicate all the good responses. I ended up having an error because of the size of the arrays. I increased them to 512 and it works fine now using the dik codes. I decided not to overide the behavior of alt-tab for the reasons stated by the posters and instead to use alt-enter. I already had code in my winproc for the WM_ACTIVATE that I didnt want to alter and its probably alot better off that way. I wanted to include the ascii codes because it makes it easier to write functions for capturing typed text, making textbox functionality and such but I''ll use the dik codes for most input. I am off to do my
"The Bug is Squashed Dance"
Thanx,
Christopher
"The Bug is Squashed Dance"
Thanx,
Christopher
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