windows 中操纵杆的 C++ 编程

Question

我想在 windows.I 中将游戏杆连接到我的 c++ qt 程序在 microsoft guid for joystick program 中使用游戏杆 api 库研究了 win32 编程 api 但我没有不太明白检查系统兼容性后我该怎么办？

完成说明：

我的系统兼容性代码：

JOYINFO joyinfo;
UINT wNumDevs, wDeviceID;
BOOL bDev1Attached, bDev2Attached;
void joyCapablitis(){
    if((wNumDevs = joyGetNumDevs()) == 0)
        qDebug()<<"no driver available";
    bDev1Attached = joyGetPos(JOYSTICKID1,&joyinfo) != JOYERR_UNPLUGGED;
    bDev2Attached = wNumDevs == 2 && joyGetPos(JOYSTICKID2,&joyinfo) !=
            JOYERR_UNPLUGGED;
    if(bDev1Attached || bDev2Attached)   // decide which joystick to use
    {

        wDeviceID = bDev1Attached ? JOYSTICKID1 : JOYSTICKID2;

    }
    else
        qDebug()<<"no device available";

}

我想跟踪按钮的移动并在software.How中模拟它我可以从win32中获取摇杆信息（例如按钮的数量和按钮打开或关闭）吗api？

Answer 1

根据Joysticks，

The multimedia joystick API has been superseded by DirectInput, which has more capabilities for today's input and force-feedback devices. For more information, see the DirectX documentation.

你需要的是DirectInput, please start from Buffered Joystick Data.

Each element in the DIDEVICEOBJECTDATA array represents a change in state for a single object on the joystick. For instance, if the user presses button 0 and moves the stick diagonally, the array passed to IDirectInputDevice8::GetDeviceData (if it has at least three elements, and pdwInOut is at least 3) will have three elements filled in-an element for button 0 being pressed, an element for the change in the x-axis, and an element for the change in the y-axis-and the value of pdwInOut will be set to 3.

和Immediate Joystick Data,

To retrieve the current state of the joystick, call the IDirectInputDevice8::GetDeviceState method with a pointer to a DIJOYSTATE or a DIJOYSTATE2 structure, depending on whether the data format was set with c_dfDIJoystick or c_dfDIJoystick2. (See Device Data Formats.) The joystick state returned in the structure includes the coordinates of the axes, the state of the buttons, and the state of the point-of-view controllers.

Answer 2

我以 Qt 模块的形式编写了一个 QJoystick 库，但尚未发布。

这是 Windows 的一些代码。

首先，您需要初始化DirectInput：

#include "comdef.h"

#define SAFE_DELETE(p)  { if(p) { delete (p);     (p) = nullptr; }}
#define SAFE_RELEASE(p) { if(p) { (p)->Release(); (p) = nullptr; }}

#define AS(x, p) reinterpret_cast<x>(p)

BOOL CALLBACK EnumJoysticksCallback(const DIDEVICEINSTANCE*       deviceInstance, void* controller);
BOOL CALLBACK EnumObjectsCallback  (const DIDEVICEOBJECTINSTANCE* objectInstance, void* controller);

static LPDIRECTINPUT8 DirectInputPtr = nullptr;

HRESULT hr;

if (DirectInputPtr == nullptr)
{
    if (FAILED(hr = DirectInput8Create(GetModuleHandle(nullptr), DIRECTINPUT_VERSION, IID_IDirectInput8, AS(void**, &DirectInputPtr), nullptr)))
        qCritical("QJoystick failed to obtain direct input interface: %s", qPrintable(hrError(hr)));
}

二、设置回调：

if (DirectInputPtr)
{
    if (FAILED(hr = DirectInputPtr->EnumDevices(DI8DEVCLASS_GAMECTRL, EnumJoysticksCallback, this, DIEDFL_ATTACHEDONLY)))
        qDebug("QJoystick EnumDevices failed");

    if (joystickPtr)
    {
        if (FAILED(hr = joystickPtr->SetDataFormat(&c_dfDIJoystick2)))
            qWarning("QJoystick: failed to set data format for id %d", deviceId);

        if (SUCCEEDED(hr = joystickPtr->EnumObjects(EnumObjectsCallback, this, DIDFT_ALL)))
        {
            DIDEVICEINSTANCE joystickinfo;
            joystickinfo.dwSize = sizeof(joystickinfo);

            if (FAILED(hr = joystickPtr->GetDeviceInfo(&joystickinfo)))
            {
                qCritical() << "QJoystick GetDeviceInfo failed:" << hrError(hr);
                SAFE_RELEASE(joystickPtr)
            }

            description = QString::fromWCharArray(joystickinfo.tszProductName);
            guid        = QString("%1").arg(joystickinfo.guidProduct.Data1, 8, 16, QLatin1Char('0'));
        }
        else
            qCritical("QJoystick: set callback on EnumObjects failed for %d", deviceId);
    }
}

EnumJoysticksCallback 是您为操纵杆创建虚拟设备的地方：

BOOL CALLBACK EnumJoysticksCallback(const DIDEVICEINSTANCE* deviceInstance, void* pController)
{
    QJoystickPrivate* controller = AS(QJoystickPrivate*, pController);
    BOOL result = DIENUM_CONTINUE;

    if (controller->enumCounter == controller->deviceId)
    {
        HRESULT hr = DirectInputPtr->CreateDevice(deviceInstance->guidInstance, &(controller->joystickPtr), nullptr);

        if (SUCCEEDED(hr))
            result = DIENUM_STOP;
        else
            qWarning("QJoystick: CreateDevice failed %d", controller->deviceId);
    }
    else
        ++controller->enumCounter;

    return result;
}

并且EnumObjectsCallback将在枚举过程中对每个按钮或轴执行：

BOOL CALLBACK EnumObjectsCallback(const DIDEVICEOBJECTINSTANCE* objectInstance, void* pController)
{
    QJoystickPrivate* controller = AS(QJoystickPrivate*, pController);

    //Set the range for axis
    if (objectInstance->dwType & DIDFT_AXIS)
    {
        DIPROPRANGE diprg;

        diprg.diph.dwSize       = sizeof(DIPROPRANGE);
        diprg.diph.dwHeaderSize = sizeof(DIPROPHEADER);
        diprg.diph.dwHow        = DIPH_BYID;
        diprg.diph.dwObj        = objectInstance->dwType; // Specify the enumerated axis

        diprg.lMin = -1000;
        diprg.lMax = +1000;

        if (FAILED(controller->joystickPtr->SetProperty(DIPROP_RANGE, &diprg.diph)))
            return DIENUM_STOP;
    }

    if (objectInstance->guidType == GUID_XAxis  || objectInstance->guidType == GUID_YAxis  || objectInstance->guidType == GUID_ZAxis  ||
        objectInstance->guidType == GUID_RxAxis || objectInstance->guidType == GUID_RyAxis || objectInstance->guidType == GUID_RzAxis ||
        objectInstance->guidType == GUID_Slider)
    {
        // axis
    }
    else if (objectInstance->guidType == GUID_POV)
        // pov...
    else if (objectInstance->guidType == GUID_Button)
        // button...
    else if (objectInstance->guidType == GUID_Unknown)
        // unknown...

    return DIENUM_CONTINUE;
}

windows 中操纵杆的 C++ 编程

c++ programming for joystick in windows

c++

winapi

qt

joystick