使用原始输入

项目
06/12/2023

本部分包括用于以下目的的示例代码：

注册原始输入
- 示例 1
- 示例 2
执行原始输入的标准读取
执行原始输入的缓冲读取

注册原始输入

示例 1

在此示例中，应用程序指定来自游戏控制器的原始输入 (游戏板和游戏杆) 以及电话使用页面（应答计算机除外）的所有设备。

RAWINPUTDEVICE Rid[4];
        
Rid[0].usUsagePage = 0x01;          // HID_USAGE_PAGE_GENERIC
Rid[0].usUsage = 0x05;              // HID_USAGE_GENERIC_GAMEPAD
Rid[0].dwFlags = 0;                 // adds game pad
Rid[0].hwndTarget = 0;

Rid[1].usUsagePage = 0x01;          // HID_USAGE_PAGE_GENERIC
Rid[1].usUsage = 0x04;              // HID_USAGE_GENERIC_JOYSTICK
Rid[1].dwFlags = 0;                 // adds joystick
Rid[1].hwndTarget = 0;

Rid[2].usUsagePage = 0x0B;          // HID_USAGE_PAGE_TELEPHONY
Rid[2].usUsage = 0x00; 
Rid[2].dwFlags = RIDEV_PAGEONLY;    // adds all devices from telephony page
Rid[2].hwndTarget = 0;

Rid[3].usUsagePage = 0x0B;          // HID_USAGE_PAGE_TELEPHONY
Rid[3].usUsage = 0x02;              // HID_USAGE_TELEPHONY_ANSWERING_MACHINE
Rid[3].dwFlags = RIDEV_EXCLUDE;     // excludes answering machines
Rid[3].hwndTarget = 0;

if (RegisterRawInputDevices(Rid, 4, sizeof(Rid[0])) == FALSE)
{
    //registration failed. Call GetLastError for the cause of the error.
}

示例 2

在此示例中，应用程序需要来自键盘和鼠标的原始输入，但希望忽略来自同一键盘和鼠标) (旧键盘和鼠标窗口消息。

RAWINPUTDEVICE Rid[2];
        
Rid[0].usUsagePage = 0x01;          // HID_USAGE_PAGE_GENERIC
Rid[0].usUsage = 0x02;              // HID_USAGE_GENERIC_MOUSE
Rid[0].dwFlags = RIDEV_NOLEGACY;    // adds mouse and also ignores legacy mouse messages
Rid[0].hwndTarget = 0;

Rid[1].usUsagePage = 0x01;          // HID_USAGE_PAGE_GENERIC
Rid[1].usUsage = 0x06;              // HID_USAGE_GENERIC_KEYBOARD
Rid[1].dwFlags = RIDEV_NOLEGACY;    // adds keyboard and also ignores legacy keyboard messages
Rid[1].hwndTarget = 0;

if (RegisterRawInputDevices(Rid, 2, sizeof(Rid[0])) == FALSE)
{
    //registration failed. Call GetLastError for the cause of the error
}

执行原始输入的标准读取

此示例演示应用程序如何执行无缓冲区 (或标准) 从键盘或鼠标人机接口设备读取原始输入 (HID) ，然后从设备打印出各种信息。

case WM_INPUT: 
{
    UINT dwSize;

    GetRawInputData((HRAWINPUT)lParam, RID_INPUT, NULL, &dwSize, sizeof(RAWINPUTHEADER));
    LPBYTE lpb = new BYTE[dwSize];

    if (GetRawInputData((HRAWINPUT)lParam, RID_INPUT, lpb, &dwSize, sizeof(RAWINPUTHEADER)) != dwSize)
         OutputDebugString (TEXT("GetRawInputData does not return correct size !\n")); 

    RAWINPUT* raw = (RAWINPUT*)lpb;

    if (raw->header.dwType == RIM_TYPEKEYBOARD) 
    {
        hResult = StringCchPrintf(szTempOutput, STRSAFE_MAX_CCH,
            TEXT(" Kbd: make=%04x Flags:%04x Reserved:%04x ExtraInformation:%08x, msg=%04x VK=%04x \n"), 
            raw->data.keyboard.MakeCode, 
            raw->data.keyboard.Flags, 
            raw->data.keyboard.Reserved, 
            raw->data.keyboard.ExtraInformation, 
            raw->data.keyboard.Message, 
            raw->data.keyboard.VKey);
        if (FAILED(hResult))
        {
        // TODO: write error handler
        }
        OutputDebugString(szTempOutput);
    }
    else if (raw->header.dwType == RIM_TYPEMOUSE) 
    {
        hResult = StringCchPrintf(szTempOutput, STRSAFE_MAX_CCH,
            TEXT("Mouse: usFlags=%04x ulButtons=%04x usButtonFlags=%04x usButtonData=%04x ulRawButtons=%04x lLastX=%04x lLastY=%04x ulExtraInformation=%04x\r\n"), 
            raw->data.mouse.usFlags, 
            raw->data.mouse.ulButtons, 
            raw->data.mouse.usButtonFlags, 
            raw->data.mouse.usButtonData, 
            raw->data.mouse.ulRawButtons, 
            raw->data.mouse.lLastX, 
            raw->data.mouse.lLastY, 
            raw->data.mouse.ulExtraInformation);

        if (FAILED(hResult))
        {
        // TODO: write error handler
        }
        OutputDebugString(szTempOutput);
    } 

    delete[] lpb; 
    return 0;
}

执行原始输入的缓冲读取

此示例演示应用程序如何从通用 HID 对原始输入执行缓冲读取。

case MSG_GETRIBUFFER: // Private message
    {
    UINT cbSize;
    Sleep(1000);

    VERIFY(GetRawInputBuffer(NULL, &cbSize, sizeof(RAWINPUTHEADER)) == 0);
    cbSize *= 16; // up to 16 messages
    Log(_T("Allocating %d bytes"), cbSize);
    PRAWINPUT pRawInput = (PRAWINPUT)malloc(cbSize);
    if (pRawInput == NULL)
    {
        Log(_T("Not enough memory"));
        return;
    }

    for (;;)
    {
        UINT cbSizeT = cbSize;
        UINT nInput = GetRawInputBuffer(pRawInput, &cbSizeT, sizeof(RAWINPUTHEADER));
        Log(_T("nInput = %d"), nInput);
        if (nInput == 0)
        {
            break;
        }

        ASSERT(nInput > 0);
        PRAWINPUT* paRawInput = (PRAWINPUT*)malloc(sizeof(PRAWINPUT) * nInput);
        if (paRawInput == NULL)
        {
            Log(_T("paRawInput NULL"));
            break;
        }

        PRAWINPUT pri = pRawInput;
        for (UINT i = 0; i < nInput; ++i)
        {
            Log(_T(" input[%d] = @%p"), i, pri);
            paRawInput[i] = pri;
            pri = NEXTRAWINPUTBLOCK(pri);
        }

        free(paRawInput);
    }
    free(pRawInput);
}

通过