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Usando a entrada bruta

Esta seção inclui o código de exemplo para as seguintes finalidades:

Registrando-se para entrada bruta

Exemplo 1

Neste exemplo, um aplicativo especifica a entrada bruta de controladores de jogo (teclados de jogos e joysticks) e todos os dispositivos fora da página de uso de telefonia, exceto computadores de resposta.

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.
}

Exemplo 2

Neste exemplo, um aplicativo deseja entrada bruta do teclado e do mouse, mas deseja ignorar mensagens herdadas de teclado e janela do mouse (que viriam do mesmo teclado e mouse).

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
}

Executando uma leitura padrão de entrada bruta

Este exemplo mostra como um aplicativo faz uma leitura não compatível (ou padrão) de entrada bruta de um hid (dispositivo de interface humana) de teclado ou mouse e, em seguida, imprime várias informações do dispositivo.

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;
} 

Executando uma leitura em buffer de entrada bruta

Este exemplo mostra como um aplicativo faz uma leitura em buffer de entrada bruta de um HID genérico.

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);
}