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Device's windowed

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When I set D3DPresentParams.windowed = true, it failed to create the device. Then I reboot my computer and complie it. It works fine . Uh, My question is why? did I miss something?

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oh, sorry, here my code



HRESULT hResult = CreateD3DObject();
if (hResult != D3D_OK)
return hResult;
hResult = CheckDisplayMode();
if (hResult != D3D_OK)
return hResult;
hResult = CreateD3DDevice();
if (hResult != D3D_OK)
return hResult;

//////////////////////////////////////////////////////
// CreateD3DObject()
//////////////////////////////////////////////////////
HRESULT CDirect3D::CreateD3DObject()
{
m_pD3D = Direct3DCreate8(D3D_SDK_VERSION);
if (m_pD3D == NULL)
{
MessageBox(m_hWnd, "Couldn’t create DirectX object.",
"DirectX Error", MB_OK);
strcpy(m_szErrorMsg, "CreateD3DObject()");
return E_FAIL;
}
return D3D_OK;
}

//////////////////////////////////////////////////////
// CheckDisplayMode()
//////////////////////////////////////////////////////
HRESULT CDirect3D::CheckDisplayMode()
{
HRESULT hResult = m_pD3D->CheckDeviceType(D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL, D3DFMT_X8R8G8B8, D3DFMT_X8R8G8B8, FALSE);
if (hResult != D3D_OK)
{
MessageBox(m_hWnd, "The required display mode is not available on this system.",
"DirectX Error", MB_OK);
strcpy(m_szErrorMsg, "CheckDisplayMode()");
return hResult;
}
return D3D_OK;
}

//////////////////////////////////////////////////////
// CreateD3DDevice()
//////////////////////////////////////////////////////
HRESULT CDirect3D::CreateD3DDevice()
{
D3DPRESENT_PARAMETERS D3DPresentParams;
ZeroMemory(&D3DPresentParams, sizeof(D3DPRESENT_PARAMETERS));
D3DPresentParams.Windowed = true;
D3DPresentParams.BackBufferCount = 1;
D3DPresentParams.BackBufferWidth = 640;
D3DPresentParams.BackBufferHeight = 480;
D3DPresentParams.BackBufferFormat = D3DFMT_X8R8G8B8;
D3DPresentParams.SwapEffect = D3DSWAPEFFECT_DISCARD;
D3DPresentParams.hDeviceWindow = m_hWnd;
HRESULT hResult = m_pD3D->CreateDevice(D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL, m_hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&D3DPresentParams, &m_pD3DDevice);
if (FAILED(hResult))
{
MessageBox(m_hWnd, "Failed to create Direct3D device.",
"DirectX Error", MB_OK);
strcpy(m_szErrorMsg, "CreateD3DDevice()");
return hResult;
}
return hResult;
}


P.S. how I do make display as visual C++'s version?

[edited by - Starfalcon2 on May 31, 2004 1:04:30 PM]

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