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天行健 君子當自強而不息

使用DirectInput進行交互(4)

 

本篇是使用DirectInput進行交互(3)的續(xù)篇,當時由于身邊沒有游戲操縱桿,所以拖到現(xiàn)在才寫。

 

使用游戲桿玩游戲

游戲桿是游戲控制的支柱,盡管游戲桿不是游戲惟一可以使用的輸入設(shè)備,但它卻是專門為玩游戲而設(shè)計的。將游戲桿向左推,游戲人物就會向左走,按下一個按鍵,游戲中的英雄就會揮舞他的劍,還有什么比這更容易的嗎?

游戲桿的形狀和大小千差萬別,商店貨架上的方向盤控制器就是一個游戲桿。如果去過街機游戲廳,就可能玩過允許(或要求)玩家站在很大的踏雪板或騎在小摩托車上來控制屏幕上的角色之類的游戲。別驚奇,這些踏雪板和摩托車甚至都可以看成是游戲桿!

游戲桿是一種軸控制器,按鍵很少。方向盤只有一個用于向左向右轉(zhuǎn)向的控制軸,它可能還有用于剎車和控制油門的控制軸。連基本的兩鍵游戲桿都有兩個控制軸:一個用于向上和向下,另外一個用于向左和向右。

下圖顯示了一些游戲桿,不論外形如何,方向性、旋轉(zhuǎn)型以及推動型輸入是游戲桿的共同特征。

控制軸只是一個電位器(變量寄存器),它控制傳送給電路的電壓。傳送的最小電壓表示一個軸的范圍(游戲桿能夠被移動的最遠點),而最大電壓表示的是另外一個范圍,所有電壓就介于這兩個范圍之間。

電壓會流向系統(tǒng),多虧經(jīng)過windows(或directinput)處理,因此才能使用它。游戲桿按鍵的工作方式幾乎完全相同,就是根據(jù)電壓是否施加到按鍵上來發(fā)出按鍵是否被按下的信號。

讀入游戲桿數(shù)據(jù)的方式采用的是絕對值,這些絕對值都是相對于游戲桿中心的值。向左或向右推動游戲桿,都會接收到負值,負值表示遠離游戲桿中心的距離。向下或向右按,就會得到正值。按鍵都是單個標志,這些標志指出了按鍵是否被按下。

各種游戲桿之間惟一較大的差別就是那些帶有數(shù)字控制軸的游戲桿了,這些游戲桿就像是一些按鍵的組合。將游戲桿向左推就像按下一個表示向左的按鍵一樣,無論程序員何時查詢游戲桿以得到正在讀取的軸,游戲桿都會返回軸的可能最低值或最高值。

 

使用DirectInput處理游戲桿

從某種程度上講,游戲桿是最難處理的設(shè)備。最難的地方在于游戲桿的設(shè)置,要找到連接到系統(tǒng)中的游戲桿設(shè)備,必須進行枚舉。在枚舉的過程中,必須決定使用哪個游戲桿,然后再為游戲桿創(chuàng)建COM對象。

如下所示,該函數(shù)枚舉并返回第一個枚舉到的游戲桿。

IDirectInput8* g_di;                    // directinput component
IDirectInputDevice8* g_enum_joystick;   // enum joystick device
IDirectInputDevice8* g_joystick;        // joystick device

//--------------------------------------------------------------------------------
// Initialize joystick interface, return a joystick interface pointer.
//--------------------------------------------------------------------------------
IDirectInputDevice8* init_joystick(HWND hwnd, IDirectInput8* di)
{
    g_di->EnumDevices(DI8DEVTYPE_JOYSTICK, enum_joysticks, NULL, DIEDFL_ATTACHEDONLY);
    
    
// everything was a success, return the pointer.
    return g_enum_joystick;
}

接著來看看枚舉函數(shù)的實現(xiàn):

 
//--------------------------------------------------------------------------------
// Enumerate all attached joysticks, return first enumerated joystick.
//--------------------------------------------------------------------------------
BOOL CALLBACK enum_joysticks(LPCDIDEVICEINSTANCE device_inst, LPVOID ref)
{
    DIPROPRANGE prop_range;
    DIPROPDWORD prop_dword;

    g_enum_joystick = NULL;

    
// create the device object using global directinput object
    if(FAILED(g_di->CreateDevice(device_inst->guidInstance, &g_enum_joystick, NULL)))
        
return DIENUM_CONTINUE;

    
// set the data format
    if(FAILED(g_enum_joystick->SetDataFormat(&c_dfDIJoystick)))
        
goto fail;

    
// set the cooperative mode
    if(FAILED(g_enum_joystick->SetCooperativeLevel(g_hwnd, DISCL_FOREGROUND | DISCL_NONEXCLUSIVE)))
        
goto fail;

    
// clear out the structure first
    ZeroMemory(&prop_range, sizeof(DIPROPRANGE));

    prop_range.diph.dwSize       = 
sizeof(DIPROPRANGE);
    prop_range.diph.dwHeaderSize = 
sizeof(DIPROPHEADER);
    prop_range.diph.dwHow        = DIJOFS_X;
    prop_range.diph.dwHow        = DIPH_BYOFFSET;  
// offset into data format
    prop_range.lMin              = -1024;
    prop_range.lMax              = 1024;

    
// Sets properties that define the device behavior. 
    // These properties include input buffer size and axis mode.
    HRESULT rv = g_enum_joystick->SetProperty(DIPROP_RANGE, &prop_range.diph);

    
if(FAILED(rv))
    {
        
if(rv == DIERR_INVALIDPARAM)
            MessageBox(NULL, "invalid param", NULL, MB_OK);
        
else if(rv == DIERR_NOTINITIALIZED)
            MessageBox(NULL, "not initialize", NULL, MB_OK);
        
else if(rv == DIERR_OBJECTNOTFOUND)
            MessageBox(NULL, "object not found", NULL, MB_OK);
        
else if(rv == DIERR_UNSUPPORTED)
            MessageBox(NULL, "unsopported", NULL, MB_OK);

        
goto fail;   
    }

    prop_range.diph.dwObj = DIJOFS_Y;

    
if(FAILED(g_enum_joystick->SetProperty(DIPROP_RANGE, &prop_range.diph)))
        
goto fail;

    
// set x deadzone to 15%
    prop_dword.diph.dwSize       = sizeof(DIPROPDWORD);
    prop_dword.diph.dwHeaderSize = 
sizeof(DIPROPHEADER);
    prop_dword.diph.dwHow        = DIPH_BYOFFSET;
    prop_dword.diph.dwObj        = DIJOFS_X;
    prop_dword.dwData            = 1500;

    
if(FAILED(g_enum_joystick->SetProperty(DIPROP_DEADZONE, &prop_dword.diph)))
        
goto fail;

    
// set Y deadzone
    prop_dword.diph.dwObj = DIJOFS_Y;

    
if(FAILED(g_enum_joystick->SetProperty(DIPROP_DEADZONE, &prop_dword.diph)))
        
goto fail;

    
// acquire the device for use
    if(FAILED(g_enum_joystick->Acquire()))
        
goto fail;

    
// stop enumeration
    return DIENUM_STOP;

fail:
    g_enum_joystick->Release();
    g_enum_joystick = NULL;

    
return DIENUM_CONTINUE;
}

其中涉及到的結(jié)構(gòu)體DIPROPRANGE定義如下:

Contains information about the range of an object within a device. This structure is used with the DIPROP_RANGE flag set in the IDirectInputDevice8::GetProperty and IDirectInputDevice8::SetProperty methods.

typedef struct DIPROPRANGE {
DIPROPHEADER diph;
LONG lMin;
LONG lMax;
} DIPROPRANGE, *LPDIPROPRANGE;

Members

diph
DIPROPHEADER structure.
lMin
Lower limit of the range. If the range of the device is unrestricted, this value is DIPROPRANGE_NOMIN when the IDirectInputDevice8::GetProperty method returns.
lMax
Upper limit of the range. If the range of the device is unrestricted, this value is DIPROPRANGE_NOMAX when the IDirectInputDevice8::GetProperty method returns.

Remarks

The diph member must be initialized as follows:

Member Value
dwSize sizeof(DIPROPRANGE)
dwHeaderSize sizeof(DIPROPHEADER)
dwObj If the dwHow member is DIPH_DEVICE, this member must be 0.

If the dwHow member is DIPH_BYID, this member must be the identifier for the object whose property setting is to be set or retrieved.

If the dwHow member is DIPH_BYOFFSET, this member must be a data format offset for the object whose property setting is to be set or retrieved. For example, if the c_dfDIMouse data format is selected, it must be one of the DIMOFS_* values.Identifier of the object whose property is being retrieved or set.

If the dwHow member is DIPH_BYUSAGE, the device must be a Human Interface Device (human interface device). The device object will be identified by the HID usage page and usage values in packed form.

dwHow Specifies how the dwObj member should be interpreted. See the preceding description of the dwObj member for details.

The range values for devices whose ranges are unrestricted wraparound.

 

DIPROPDWORD結(jié)構(gòu)體的定義如下:

Used to access DWORD properties.

typedef struct DIPROPDWORD {
DIPROPHEADER diph;
DWORD dwData;
} DIPROPDWORD, *LPDIPROPDWORD;

Members

diph
DIPROPHEADER structure.
dwData
Property-specific value being set or retrieved.
 

DIPROPHEADER的定義如下:

Serves as a header for all property structures.

typedef struct DIPROPHEADER {
DWORD dwSize;
DWORD dwHeaderSize;
DWORD dwObj;
DWORD dwHow;
} DIPROPHEADER, *LPDIPROPHEADER;

Members

dwSize
Size of the enclosing structure. This member must be initialized before the structure is used.
dwHeaderSize
Size of the DIPROPHEADER structure.
dwObj
Object for which the property is to be accessed. The value set for this member depends on the value specified in the dwHow member.
dwHow
Value that specifies how the dwObj member should be interpreted. This value can be one of the following:
DIPH_DEVICE
The dwObj member must be 0.
DIPH_BYOFFSET
The dwObj member is the offset into the current data format of the object whose property is being accessed.
DIPH_BYUSAGE
The dwObj member is the human interface device usage page and usage values in packed form.
DIPH_BYID
The dwObj member is the object type/instance identifier. This identifier is returned in the dwType member of the DIDEVICEOBJECTINSTANCE structure returned from a previous call to the IDirectInputDevice8::EnumObjects member.

 

如果有游戲桿被初始化,g_enum_joystick就成了指向新對象的指針,反之如果沒有游戲桿被初始化,它就等于NULL。一旦設(shè)備對象被初始化,就能像前面讀取鍵盤和鼠標的信息一樣讀取游戲桿的信息,但是read_joystick函數(shù)要使用DIJOYSTATE結(jié)構(gòu)體。

Describes the state of a joystick device. This structure is used with the IDirectInputDevice8::GetDeviceState method.

typedef struct DIJOYSTATE {
LONG lX;
LONG lY;
LONG lZ;
LONG lRx;
LONG lRy;
LONG lRz;
LONG rglSlider[2];
DWORD rgdwPOV[4];
BYTE rgbButtons[32];
} DIJOYSTATE, *LPDIJOYSTATE;

Members

lX
X-axis, usually the left-right movement of a stick.
lY
Y-axis, usually the forward-backward movement of a stick.
lZ
Z-axis, often the throttle control. If the joystick does not have this axis, the value is 0.
lRx
X-axis rotation. If the joystick does not have this axis, the value is 0.
lRy
Y-axis rotation. If the joystick does not have this axis, the value is 0.
lRz
Z-axis rotation (often called the rudder). If the joystick does not have this axis, the value is 0.
rglSlider
Two additional axes, formerly called the u-axis and v-axis, whose semantics depend on the joystick. Use the IDirectInputDevice8::GetObjectInfo method to obtain semantic information about these values.
rgdwPOV
Direction controllers, such as point-of-view hats. The position is indicated in hundredths of a degree clockwise from north (away from the user). The center position is normally reported as - 1; but see Remarks. For indicators that have only five positions, the value for a controller is - 1, 0, 9,000, 18,000, or 27,000.
rgbButtons
Array of buttons. The high-order bit of the byte is set if the corresponding button is down, and clear if the button is up or does not exist.

Remarks

You must prepare the device for joystick-style access by calling the IDirectInputDevice8::SetDataFormat method, passing the c_dfDIJoystick global data format variable.

If an axis is in relative mode, the appropriate member contains the change in position. If it is in absolute mode, the member contains the absolute axis position.

Some drivers report the centered position of the POV indicator as 65,535. Determine whether the indicator is centered as follows:

BOOL POVCentered = (LOWORD(dwPOV) == 0xFFFF);

Note    Under DirectX 7.0, sliders on some joysticks could be assigned to the Z axis, with subsequent code retrieving data from that member. Using DirectX 8.0 and later, those same sliders will be assigned to the rglSlider array. This should be taken into account when porting applications to later versions of DirectX. Make any necessary alterations to ensure that slider data is retrieved from the rglSlider array.

來看看read_joystick的實現(xiàn):

//--------------------------------------------------------------------------------
// Read joystick buffer.
//--------------------------------------------------------------------------------
BOOL read_joystick(void* buffer, long buffer_size)
{
    HRESULT rv;

    
while(1)
    {
        
// poll device
        g_joystick->Poll();

        
// read in state
        if(SUCCEEDED(rv = g_joystick->GetDeviceState(buffer_size, buffer)))
            
break;

        
// return when an unknown error
        if(rv != DIERR_INPUTLOST || rv != DIERR_NOTACQUIRED)
            
return FALSE;

        
// re-acquire and try again
        if(FAILED(g_joystick->Acquire()))
            
return FALSE;
    }

    
return TRUE;
}

用于讀取按鍵狀態(tài)的宏在這里仍然起作用:

#define JOYSTICK_BUTTON_STATE(x) ((joy_state.rgbButtons[x] &0x80) ? TRUE : FALSE)

 

完整代碼示例如下:

點擊下載源碼和工程

/***************************************************************************************
PURPOSE:
    Joystick device Demo
 ***************************************************************************************/


#define DIRECTINPUT_VERSION 0x0800

#include <windows.h>
#include <stdio.h>
#include <dinput.h>
#include "resource.h"

#pragma comment(lib, "dxguid.lib")
#pragma comment(lib, "dinput8.lib")

#pragma warning(disable : 4996)

#define Safe_Release(p) if((p)) (p)->Release();

// window handles, class and caption text.
HWND g_hwnd;
char g_class_name[] = "JoystickClass";

IDirectInput8* g_di;                    
// directinput component
IDirectInputDevice8* g_enum_joystick;   // enum joystick device
IDirectInputDevice8* g_joystick;        // joystick device

BOOL CALLBACK enum_joysticks(LPCDIDEVICEINSTANCE device_inst, LPVOID 
ref);

//--------------------------------------------------------------------------------
// Window procedure.
//--------------------------------------------------------------------------------
long WINAPI window_proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    
switch(msg)
    {
    
case WM_DESTROY:
        PostQuitMessage(0);
        
return 0;
    }

    
return (long) DefWindowProc(hwnd, msg, wParam, lParam);
}

//--------------------------------------------------------------------------------
// Initialize joystick interface, return a joystick interface pointer.
//--------------------------------------------------------------------------------
IDirectInputDevice8* init_joystick(HWND hwnd, IDirectInput8* di)
{
    g_di->EnumDevices(DI8DEVTYPE_JOYSTICK, enum_joysticks, NULL, DIEDFL_ATTACHEDONLY);
    
    
// everything was a success, return the pointer.
    return g_enum_joystick;
}

//--------------------------------------------------------------------------------
// Read joystick buffer.
//--------------------------------------------------------------------------------
BOOL read_joystick(void* buffer, long buffer_size)
{
    HRESULT rv;

    
while(1)
    {
        
// poll device
        g_joystick->Poll();

        
// read in state
        if(SUCCEEDED(rv = g_joystick->GetDeviceState(buffer_size, buffer)))
            
break;

        
// return when an unknown error
        if(rv != DIERR_INPUTLOST || rv != DIERR_NOTACQUIRED)
            
return FALSE;

        
// re-acquire and try again
        if(FAILED(g_joystick->Acquire()))
            
return FALSE;
    }

    
return TRUE;
}

//--------------------------------------------------------------------------------
// Enumerate all attached joysticks, return first enumerated joystick.
//--------------------------------------------------------------------------------
BOOL CALLBACK enum_joysticks(LPCDIDEVICEINSTANCE device_inst, LPVOID ref)
{
    DIPROPRANGE prop_range;
    DIPROPDWORD prop_dword;

    g_enum_joystick = NULL;

    
// create the device object using global directinput object
    if(FAILED(g_di->CreateDevice(device_inst->guidInstance, &g_enum_joystick, NULL)))
        
return DIENUM_CONTINUE;

    
// set the data format
    if(FAILED(g_enum_joystick->SetDataFormat(&c_dfDIJoystick)))
        
goto fail;

    
// set the cooperative mode
    if(FAILED(g_enum_joystick->SetCooperativeLevel(g_hwnd, DISCL_FOREGROUND | DISCL_NONEXCLUSIVE)))
        
goto fail;

    
// clear out the structure first
    ZeroMemory(&prop_range, sizeof(DIPROPRANGE));

    prop_range.diph.dwSize       = 
sizeof(DIPROPRANGE);
    prop_range.diph.dwHeaderSize = 
sizeof(DIPROPHEADER);
    prop_range.diph.dwHow        = DIJOFS_X;
    prop_range.diph.dwHow        = DIPH_BYOFFSET;  
// offset into data format
    prop_range.lMin              = -1024;
    prop_range.lMax              = 1024;

    
// Sets properties that define the device behavior. 
    // These properties include input buffer size and axis mode.
    HRESULT rv = g_enum_joystick->SetProperty(DIPROP_RANGE, &prop_range.diph);

    
if(FAILED(rv))
    {
        
if(rv == DIERR_INVALIDPARAM)
            MessageBox(NULL, "invalid param", NULL, MB_OK);
        
else if(rv == DIERR_NOTINITIALIZED)
            MessageBox(NULL, "not initialize", NULL, MB_OK);
        
else if(rv == DIERR_OBJECTNOTFOUND)
            MessageBox(NULL, "object not found", NULL, MB_OK);
        
else if(rv == DIERR_UNSUPPORTED)
            MessageBox(NULL, "unsopported", NULL, MB_OK);

        
goto fail;   
    }

    prop_range.diph.dwObj = DIJOFS_Y;

    
if(FAILED(g_enum_joystick->SetProperty(DIPROP_RANGE, &prop_range.diph)))
        
goto fail;

    
// set x deadzone to 15%
    prop_dword.diph.dwSize       = sizeof(DIPROPDWORD);
    prop_dword.diph.dwHeaderSize = 
sizeof(DIPROPHEADER);
    prop_dword.diph.dwHow        = DIPH_BYOFFSET;
    prop_dword.diph.dwObj        = DIJOFS_X;
    prop_dword.dwData            = 1500;

    
if(FAILED(g_enum_joystick->SetProperty(DIPROP_DEADZONE, &prop_dword.diph)))
        
goto fail;

    
// set Y deadzone
    prop_dword.diph.dwObj = DIJOFS_Y;

    
if(FAILED(g_enum_joystick->SetProperty(DIPROP_DEADZONE, &prop_dword.diph)))
        
goto fail;

    
// acquire the device for use
    if(FAILED(g_enum_joystick->Acquire()))
        
goto fail;

    
// stop enumeration
    return DIENUM_STOP;

fail:
    g_enum_joystick->Release();
    g_enum_joystick = NULL;

    
return DIENUM_CONTINUE;
}

//--------------------------------------------------------------------------------
// Main function, routine entry.
//--------------------------------------------------------------------------------
int WINAPI WinMain(HINSTANCE inst, HINSTANCE, LPSTR cmd_line, int cmd_show)
{
    WNDCLASS        win_class;
    MSG             msg;
    DIJOYSTATE      joy_state;
    
char            text[256];    

    LONG joystick_x = 0, joystick_y = 0; 
    BOOL is_first_render = TRUE;

    
// create window class and register it
    win_class.style         = CS_HREDRAW | CS_VREDRAW;
    win_class.lpfnWndProc   = window_proc;
    win_class.cbClsExtra    = 0;
    win_class.cbWndExtra    = DLGWINDOWEXTRA;
    win_class.hInstance     = inst;
    win_class.hIcon         = LoadIcon(inst, IDI_APPLICATION);
    win_class.hCursor       = LoadCursor(NULL, IDC_ARROW);
    win_class.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
    win_class.lpszMenuName  = NULL;
    win_class.lpszClassName = g_class_name;    

    
if(! RegisterClass(&win_class))
        
return FALSE;

    
// create the main window
    g_hwnd = CreateDialog(inst, MAKEINTRESOURCE(IDD_Joystick), 0, NULL);

    ShowWindow(g_hwnd, cmd_show);
    UpdateWindow(g_hwnd);

    
// initialize directinput and get keyboard device
    DirectInput8Create(inst, DIRECTINPUT_VERSION, IID_IDirectInput8, (void **) &g_di, NULL);

    
// initialize mouse
    g_joystick = init_joystick(g_hwnd, g_di);

    
if(g_joystick != NULL)
    {
        
// start message pump, waiting for signal to quit.
        ZeroMemory(&msg, sizeof(MSG));

        
while(msg.message != WM_QUIT)
        {
            
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
            
            
// read in mouse and display coordinates
            read_joystick(&joy_state, sizeof(DIJOYSTATE));

            
if(is_first_render || (joystick_x != joy_state.lX || joystick_y != joy_state.lY))
            {
                is_first_render = FALSE;
                
                sprintf(text, "%ld, %ld", joy_state.lX, joy_state.lY);
                SetWindowText(GetDlgItem(g_hwnd, IDC_COORDINATES), text);        
            }     

            joystick_x = joy_state.lX;
            joystick_y = joy_state.lY;
        }
    }
    
else
    {
        MessageBox(g_hwnd, "No Joysticks!", "Error", MB_OK);
        
return 0;
    }    

    
// release directinput objects
    g_joystick->Unacquire();
    g_joystick->Release();
    g_di->Release();

    UnregisterClass(g_class_name, inst);
    
    
return (int) msg.wParam;
}
 

程序截圖:

 

 

posted on 2007-09-19 00:39 lovedday 閱讀(1355) 評論(0)  編輯 收藏 引用

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