c++ windows中操纵杆编程

Question

我想在 windows 中将操纵杆连接到我的 c++ qt 程序。我使用 microsoft guid for joystick program 中的 joystickapi 库学习了使用 win32 api 编程但是我不明白检查系统兼容性后该怎么办？
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软件中进行模拟。如何从win32 api获取操纵杆信息(例如按钮数量和按钮打开或关闭)？

Answer 1

我以 Qt 模块的形式编写了一个 QJoystick 库，但它尚未发布。
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;
}

和 EnumObjectsCallback将在枚举过程中为每个按钮或轴执行:

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;
}