How to capture desktop image in full-screen mode qucikily?

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DirectX

Win7

desktop

capture

C++14

, +

I want to capture desktop image in win7 using Getfrontbufferdata, a interface function in DirectX9Ex. But I met the below two problems.

1. In Windowed Mode,I can capture desktop image correctly. Then I want to capture image in full-screen mode. So I changed the Windowed value into FALSE,But failed in CreateDeviceEx.

...
 d3dppEx.Windowed = FALSE;//changed this
d3dppEx.Flags = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
d3dppEx.BackBufferFormat = ddmEx.Format;
d3dppEx.BackBufferHeight = ddmEx.Height;
d3dppEx.BackBufferWidth = ddmEx.Width;
d3dppEx.MultiSampleType = D3DMULTISAMPLE_NONE;
d3dppEx.SwapEffect = D3DSWAPEFFECT_DISCARD;
//d3dpp.hDeviceWindow = hWnd;
d3dppEx.PresentationInterval = D3DPRESENT_INTERVAL_DEFAULT;
d3dppEx.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;

hr = g_pD3DEx-> CreateDeviceEx(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, NULL,D3DCREATE_SOFTWARE_VERTEXPROCESSING,&d3dppEx, NULL, &g_pd3dDeviceEx);//failed and error code is 0x8876086c 

How can I solve the problem and get the image in full-screen mode?

2. I found a strange phenomenon When test my code. When win7's Areo effects is turn on, the capture rate just be 10~20hz (MSDN said that Getfrontbufferdata is slow by design ). But when changed theme into Windows classic which will turn off the Areo. The capture rate became about 60hz. Then I turn on the Areo and recovered my original theme. The capture rate still keep about 60hz,an ideal high frequence!
I guss it is related to rdp, which windows uesd in remote desktop. But I don't know how to apply in my code.

What I have tried:

1. I changed Windowed value into FALSE but failed to create Device.

2. I tried to off the Areo. But it took about 1 minute that capture frequence be fast. Besides, I also want to keep Areo effect in my project.

hr = DwmEnableComposition(DWM_EC_DISABLECOMPOSITION);

Then I tried to turn on rdp session and added below code in my project, but nothing changed.

HRESULT hr2 = S_OK;
hr2 = CoInitialize(NULL);
IRDPSRAPISharingSession* p_ShareSession;
IRDPSRAPIInvitationManager* p_InvitationManager;
IRDPSRAPIInvitation* p_Invitation;
hr2 = CoCreateInstance(__uuidof(RDPSession), NULL, CLSCTX_ALL, __uuidof(IRDPSRAPISharingSession), reinterpret_cast<void**>(&p_ShareSession));
IConnectionPointContainer* pConnectionPointContainer = NULL;
IConnectionPoint* pConnectionPoint = NULL;
unsigned long cid;
hr2 = p_ShareSession->QueryInterface(IID_IConnectionPointContainer, reinterpret_cast<void**>(&pConnectionPointContainer));
hr2 = p_ShareSession->Open();