管理输入带有DirectX DirectInput的鼠标

Question

我尝试使用DirectX输入来管理输入鼠标。但是当我试图获取鼠标的X和Y坐标时，值是不正确的(负值或似乎是随机的)。

我向你们展示了我使用的代码：

bool    System::frame()
{
    bool result;
    if (input->isButtonDown(BUTTON_L)) //if left button is down
    {
        result = ReadMouse();
        if(!result)
            return false;
        ProcessInput();
    }
}

bool System::ReadMouse()
{
    HRESULT result;

    //this->mouseState is a DIMOUSESTATE ; this->mouse is a LDIRECTINPUTDEVICE8
    result = this->mouse->GetDeviceState(sizeof(DIMOUSESTATE), (LPVOID)&this->mouseState);
    if(FAILED(result))
    {
        if((result == DIERR_INPUTLOST) || (result == DIERR_NOTACQUIRED))
            this->mouse->Acquire();
        else
            return false;
    }
    return true;
}

void System::ProcessInput()
{
    this->mouseX = this->mouseState.lX;
    this->mouseY = this->mouseState.lY;

    if(this->mouseX < 0)
        this->mouseX = 0;
    if(this->mouseY < 0)
        this->mouseY = 0;

    if(this->mouseX > this->ScreenWidth)
        this->mouseX = this->ScreenWidth;
    if(this->mouseY > this->ScreenHeight)
        this->mouseY = this->ScreenHeight;
    return;
}

我的最后一个测试给了this->mouseX = -657和this->mouseY = -36，而不是200和200 (大约)。当我初始化鼠标时，我会检查这个函数，它们看起来很有效(我遵循了一个教程)。

Answer 1

我认为原因是DirectInput给出了鼠标位置的相关数据。有关如何从鼠标解释数据以及如何切换到绝对模式的说明，请参见：http://msdn.microsoft.com/en-us/library/windows/desktop/ee418272(v=vs.85).aspx。

建议使用原始输入API而不是DirectInput。(http://msdn.microsoft.com/en-us/library/windows/desktop/ms645536(v=vs.85).aspx