DirectDraw 问题 - 将应用程序作为常规 Windows 应用程序运行
我正在开发一个视频录制应用程序，我想在视频预览上叠加徽标和录制计时器。
我尝试运行全屏应用程序，一切正常。 然后我尝试将该应用程序作为常规 Windows 应用程序运行，但它返回了错误。
如果有办法修改它以将应用程序作为常规 Windows 应用程序运行，任何人都可以看一下下面的代码吗？
HRESULT CViewfinderRenderer::OnStartStreaming()
{
HRESULT hr = S_OK;
DDSURFACEDESC ddsd;
m_pDD = NULL;
//full screen settings
hr = DirectDrawCreate(NULL, &m_pDD, NULL);
hr = m_pDD->SetCooperativeLevel(m_hWnd, DDSCL_FULLSCREEN);
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;
ddsd.ddsCaps.dwCaps = DDSCAPS_FLIP | DDSCAPS_PRIMARYSURFACE;
ddsd.dwBackBufferCount = 1;
//end full screen settings
//normal settings
/*hr = DirectDrawCreate(NULL, &m_pDD, NULL);
hr = m_pDD->SetCooperativeLevel(m_hWnd, DDSCL_NORMAL);
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_BACKBUFFERCOUNT;
ddsd.dwBackBufferCount = 1;*/
//end normal settings
hr = m_pDD->CreateSurface(&ddsd, &m_pSurface, NULL);
if (hr != DD_OK) {
return hr;
}
// Get backsurface
hr = m_pSurface->EnumAttachedSurfaces(&m_pBackSurface, EnumFunction);
return S_OK;
}
I am developing an application for video recording and I want to overlay the video preview with a logo and recording timer.
I tried to run the full-screen application and everything worked fine. Then I tried to run the application as a regular Windows application and it returned an error.
Could anyone take a look at the code below if there's a way to modify it to run the application as a regular Windows app?
HRESULT CViewfinderRenderer::OnStartStreaming()
{
HRESULT hr = S_OK;
DDSURFACEDESC ddsd;
m_pDD = NULL;
//full screen settings
hr = DirectDrawCreate(NULL, &m_pDD, NULL);
hr = m_pDD->SetCooperativeLevel(m_hWnd, DDSCL_FULLSCREEN);
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;
ddsd.ddsCaps.dwCaps = DDSCAPS_FLIP | DDSCAPS_PRIMARYSURFACE;
ddsd.dwBackBufferCount = 1;
//end full screen settings
//normal settings
/*hr = DirectDrawCreate(NULL, &m_pDD, NULL);
hr = m_pDD->SetCooperativeLevel(m_hWnd, DDSCL_NORMAL);
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_BACKBUFFERCOUNT;
ddsd.dwBackBufferCount = 1;*/
//end normal settings
hr = m_pDD->CreateSurface(&ddsd, &m_pSurface, NULL);
if (hr != DD_OK) {
return hr;
}
// Get backsurface
hr = m_pSurface->EnumAttachedSurfaces(&m_pBackSurface, EnumFunction);
return S_OK;
}
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即使在窗口中运行，您也需要创建一个主表面，只是它不是可翻转的表面。
除了创建表面之外，您很可能还想为窗口创建一个剪裁器。 有关完整示例，请参阅这篇 GameDev 文章中的“以窗口方式运行”段落。
Even when running windowed, you need to create a primary surface, only it is not a flippable surface.
Besides of creating a surface, most likely you will want to create a clipper for the window. For a complete sample see paragraph Running windowed in this GameDev article.
它返回了什么错误？
也可以试试这个：
What error did it return?
Also try this instead: