C ++ Direct3D多屏幕捕获 [英] C++ Direct3D Multiple Screen Capture

问题描述

Direct3D专家您好，

我目前正在使用Direct3D开发一个应用程序，以便捕获我的两个显示器桌面（当然用作扩展桌面）。
以下代码效果很好，但我只能捕获主显示，而不能捕获扩展的桌面（只捕获一个屏幕两次）

我如何将此解决方案调整为双屏幕捕获？

首先，我初始化Direct3D：

  D3DDISPLAYMODE d3dDisplayMode; 
 D3DPRESENT_PARAMETERS d3dPresentationParameters; //表示参数（backbufferwidth，height ...）
 
 if（（pSinfo-> g_pD3D = Direct3DCreate9（D3D_SDK_VERSION））== NULL）
返回FALSE; 
 
 if（pSinfo-> g_pD3D-> GetAdapterDisplayMode（D3DADAPTER_DEFAULT，& d3dDisplayMode）== D3DERR_INVALIDCALL）
返回FALSE; 
 
 ZeroMemory（& d3dPresentationParameters，sizeof（D3DPRESENT_PARAMETERS））; 
 d3dPresentationParameters.Windowed = TRUE; 
 d3dPresentationParameters.Flags = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER; 
 d3dPresentationParameters.BackBufferFormat = d3dDisplayMode.Format; 
 d3dPresentationParameters.BackBufferHeight = gScreenRect.bottom = d3dDisplayMode.Height; 
 d3dPresentationParameters.BackBufferWidth = gScreenRect.right = d3dDisplayMode.Width; 
 d3dPresentationParameters.MultiSampleType = D3DMULTISAMPLE_NONE; 
 d3dPresentationParameters.SwapEffect = D3DSWAPEFFECT_DISCARD; 
 d3dPresentationParameters.hDeviceWindow = hWnd; 
 d3dPresentationParameters.PresentationInterval = D3DPRESENT_INTERVAL_DEFAULT; 
 d3dPresentationParameters.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT; 
 
 pSinfo-> uiWidth = d3dDisplayMode.Width; 
 pSinfo-> uiHeight = d3dDisplayMode.Height; 
 
 if（pSinfo-> g_pD3D-> CreateDevice（D3DADAPTER_DEFAULT，D3DDEVTYPE_REF，hWnd，D3DCREATE_SOFTWARE_VERTEXPROCESSING，& d3dPresentationParameters，& pSinfo-&D; b_dd = OK_bdd OK_b 
 $ b ; 
  

然后，执行连续屏幕截图并将图像数据保存在pData中的循环：

  while（1）
 {
 pSinfo-> g_pd3dDevice-> GetRenderTarget（0，& pSinfo-> pRenderSurface）; 
 pSinfo-> g_pd3dDevice-> CreateOffscreenPlainSurface（pSinfo-> uiWidth，pSinfo-> uiHeight，pSinfo-> d3dFormat，D3DPOOL_SYSTEMMEM，& pSinfo-> pRenderSurface，NULL）; 
 pSinfo-> g_pd3dDevice-> GetFrontBufferData（0，pSinfo-> pRenderSurface）; 
 
 //D3DXSaveSurfaceToFile(\"Desktop.bmp，D3DXIFF_BMP，pSinfo-> pRenderSurface，NULL，NULL）; //测试
 
 ZeroMemory（& pSinfo-> lockedRect，sizeof（D3DLOCKED_RECT））; 
 pSinfo-> pRenderSurface-> LockRect（& pSinfo-> lockedRect，NULL，D3DLOCK_READONLY）; 
 
 memcpy（（BYTE *）pSinfo-> pData，（BYTE *）pSinfo-> lockedRect.pBits，（pSinfo-> uiWidth）* pSinfo-> uiHeight * pSinfo-> uiBitsPerPixels / 8）; 
 
 pSinfo-> pRenderSurface-> UnlockRect（）; 
 // InvalidateRect（（（（CMainFrame *）（pApp-> m_pMainWnd））-> m_hWnd，NULL，false）; 
 pSinfo-> pRenderSurface-> Release（）; 
} 
  

有关我所遇到的问题和解决方案的更多说明：

我有两台带有扩展Windows桌面的显示器。捕获屏幕时，我有两个主屏幕截图，我想要的是一个主屏幕截图，另一个是扩展屏幕。

我想我有在某处设置一个参数，指示扩展桌面从Point.x = 1920（对于1080p屏幕）开始，但是我不知道如何。

非常感谢

Dylan

解决方案

好的，我现在已经发现了问题

需要注意的重要事项是使用以下命令创建设备：

  pSinfo-> g_pD3D-> CreateDevice（D3DADAPTER_DEFAULT，D3DDEVTYPE_REF，hWnd，D3DCREATE_SOFTWARE_VERTEXPROCESSING，& d3dPresentationParameters，& pSinfo-> g_pd3dDevice）$$$$$$） $ p> 
 
 
在这里，我正在使用D3DADAPTER_DEFAULT创建一个无法处理其他偏移的设备没错因此，我根据可用屏幕的数量调整了此代码：
  for（i = 0; i  {
 pSinfo-> g_pD3D-> CreateDevice（i，D3DDEVTYPE_REF，hWnd，D3DCREATE_SOFTWARE_VERTEXPROCESSING，& d3dPresentationParameters，& pSinfo-> g_pd3db $ b））D } 
  
 
Hello Direct3D experts,

I am currently developing an application with Direct3D in order to capture my two monitors desktop (used as extended desktop of course).
The following code works well but I am just able to capture the primary display and not the extended desktop (just one screen is captured twice)

How can I adapt this solution for a dual screen capture ? 

First of all, I initialize Direct3D:
D3DDISPLAYMODE          d3dDisplayMode;
D3DPRESENT_PARAMETERS   d3dPresentationParameters; //Presentation parameters (backbufferwidth, height...)

if( (pSinfo->g_pD3D=Direct3DCreate9(D3D_SDK_VERSION)) == NULL )
    return FALSE;

if( pSinfo->g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &d3dDisplayMode) ==  D3DERR_INVALIDCALL )
    return FALSE;

ZeroMemory(&d3dPresentationParameters,sizeof(D3DPRESENT_PARAMETERS));   
d3dPresentationParameters.Windowed = TRUE;
d3dPresentationParameters.Flags = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
d3dPresentationParameters.BackBufferFormat = d3dDisplayMode.Format;
d3dPresentationParameters.BackBufferHeight = gScreenRect.bottom = d3dDisplayMode.Height;
d3dPresentationParameters.BackBufferWidth = gScreenRect.right = d3dDisplayMode.Width;
d3dPresentationParameters.MultiSampleType = D3DMULTISAMPLE_NONE;
d3dPresentationParameters.SwapEffect= D3DSWAPEFFECT_DISCARD;
d3dPresentationParameters.hDeviceWindow = hWnd;
d3dPresentationParameters.PresentationInterval = D3DPRESENT_INTERVAL_DEFAULT;
d3dPresentationParameters.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;

pSinfo->uiWidth = d3dDisplayMode.Width;
pSinfo->uiHeight = d3dDisplayMode.Height;

if( pSinfo->g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_REF,hWnd,D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dPresentationParameters,&pSinfo->g_pd3dDevice) != D3D_OK )
    return FALSE;
And then, the loop which perform continuous screenshots and save image data in pData:
while(1)
{
    pSinfo->g_pd3dDevice->GetRenderTarget(0, &pSinfo->pRenderSurface);
    pSinfo->g_pd3dDevice->CreateOffscreenPlainSurface(pSinfo->uiWidth, pSinfo->uiHeight, pSinfo->d3dFormat, D3DPOOL_SYSTEMMEM, &pSinfo->pRenderSurface, NULL);
    pSinfo->g_pd3dDevice->GetFrontBufferData(0, pSinfo->pRenderSurface);

    //D3DXSaveSurfaceToFile("Desktop.bmp", D3DXIFF_BMP, pSinfo->pRenderSurface,NULL, NULL); //Test

    ZeroMemory(&pSinfo->lockedRect, sizeof(D3DLOCKED_RECT));
    pSinfo->pRenderSurface->LockRect(&pSinfo->lockedRect,NULL, D3DLOCK_READONLY);

    memcpy((BYTE*)pSinfo->pData, (BYTE*)pSinfo->lockedRect.pBits, (pSinfo->uiWidth) * pSinfo->uiHeight * pSinfo->uiBitsPerPixels/8);

    pSinfo->pRenderSurface->UnlockRect();
    //InvalidateRect(((CMainFrame*)(pApp->m_pMainWnd))->m_hWnd,NULL,false);
    pSinfo->pRenderSurface->Release();
}
For more clarity about the problem I have and the solution:

I have the two monitors with my extended windows desktop. when capturing the screen I have two screenshots with the main screen and what I want is one screenshot of the main screen and one other with the extended screen.

I guess I have to set up a parameter somewhere indicating that the extended desktop starts at Point.x = 1920 (for 1080p screen) but I just don't know how.

Thank you so much for your help !

Dylan

解决方案
All right, I've found the problem right now.

The important thing to notice is the Device Creation with :
pSinfo->g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_REF,hWnd,D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dPresentationParameters,&pSinfo->g_pd3dDevice) != D3D_OK )
Here I was creating a device with D3DADAPTER_DEFAULT which do not take care of other displays. Therefore, I've adapted this code depending of the number of available screens:
for (i = 0; i < NUMBER_OF_DISPLAYS; i++)
{
    pSinfo->g_pD3D->CreateDevice(i,D3DDEVTYPE_REF,hWnd,D3DCREATE_SOFTWARE_VERTEXPROCESSING ,&d3dPresentationParameters,&pSinfo->g_pd3dDevice) != D3D_OK )
}


                        
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