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  DirectInput Example
  Submitted by



This code provides both immediate and buffered keyboard input as well as mouse input. The "keyboard" array can be used as follows: if (keyboard[23]) then some action. The number 23 stands for the scan code of the key pressed/held down. (The scan codes are defined in the dinput.h file that comes with the DirectX SDK.) The "keyevent" array can be used as follows: if (keyevent[3] == true) { keyevent[3] = false; some action associated with key press }. You can look over the sample code that comes with the help files of the SDK for more detailed information on how DirectInput works.

Download Associated File: DirectInput.cpp (2,930 bytes)

#include "winmain.h"
#include "dinput.h"

LPDIRECTINPUT lpDInput = NULL; // pointer to direct input object LPDIRECTINPUTDEVICE lpDIKeyboard = NULL; // pointer to keyboard device LPDIRECTINPUTDEVICE lpDIMouse = NULL; // pointer to mouse device char keyboard[144]; // contains state of keyboard bool keyevent[144]; // scan code of a pressed key DIMOUSESTATE MouseState; // contains state of mouse float mouse_x; float mouse_y;

#define KEYBOARD_BUFFER_SIZE 1 // number of events in buffer //============================================== // InitDInput() //============================================== int InitDInput(HWND hWnd, HINSTANCE hInstance)

{

if (DirectInputCreate(hInstance, DIRECTINPUT_VERSION, &lpDInput, NULL) != DI_OK) { }

//-------------------- // Keyboard //-------------------- if (lpDInput->CreateDevice(GUID_SysKeyboard, &lpDIKeyboard, NULL) != DI_OK) { }

if (lpDIKeyboard->SetDataFormat(&c_dfDIKeyboard) != DI_OK) { }

if (lpDIKeyboard->SetCooperativeLevel(hWnd, DISCL_NONEXCLUSIVE | DISCL_FOREGROUND) != DI_OK) { }

DIPROPDWORD dipdw; dipdw.diph.dwSize = sizeof(DIPROPDWORD); dipdw.diph.dwHeaderSize = sizeof(DIPROPHEADER); dipdw.diph.dwObj = 0; dipdw.diph.dwHow = DIPH_DEVICE; dipdw.dwData = KEYBOARD_BUFFER_SIZE;

if (lpDIKeyboard->SetProperty(DIPROP_BUFFERSIZE, &dipdw.diph) != DI_OK) { }

if (lpDIKeyboard->Acquire() != DI_OK) { }

//-------------------- // Mouse //-------------------- if (lpDInput->CreateDevice(GUID_SysMouse, &lpDIMouse, NULL) != DI_OK) { }

if (lpDIMouse->SetCooperativeLevel(hWnd, DISCL_NONEXCLUSIVE | DISCL_FOREGROUND) != DI_OK) { }

if (lpDIMouse->SetDataFormat(&c_dfDIMouse) != DI_OK) { }

if (lpDIMouse->Acquire() != DI_OK) { }

return(0); }

//============================================== // GetDInput() //============================================== int GetDInput() { if(lpDIKeyboard->GetDeviceState(256, (LPVOID)keyboard) != DI_OK) { }

if(lpDIMouse->GetDeviceState(sizeof(DIMOUSESTATE), (LPVOID)&MouseState) != DI_OK) { }

mouse_x = MouseState.lX; mouse_y = MouseState.lY;

DIDEVICEOBJECTDATA key_pressed[KEYBOARD_BUFFER_SIZE]; DWORD dwItems; HRESULT hRes = DIERR_INPUTLOST;

while (DI_OK != hRes) { hRes = lpDIKeyboard->GetDeviceData(sizeof(DIDEVICEOBJECTDATA), key_pressed, &dwItems, 0); if (hRes != DI_OK) { lpDIKeyboard->Acquire(); } } if ((key_pressed[0].dwData & 0x80) ? 1 : 0) // only key-down events are reported { keyevent[key_pressed[0].dwOfs] = true; }

return(0); }

//============================================== // ReleaseDInput() //============================================== int ReleaseDInput() { if (lpDInput != NULL) { lpDInput->Release(); } if (lpDIKeyboard != NULL) { lpDIKeyboard->Unacquire(); lpDIKeyboard->Release(); } if (lpDIMouse != NULL) { lpDIMouse->Unacquire(); lpDIMouse->Release(); }

return(0); }

The zip file viewer built into the Developer Toolbox made use of the zlib library, as well as the zlibdll source additions.

 

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