我已经编写了一段代码,可以对桌面进行截图并映射为原始像素数据,但输出全为零。我不知道哪里出错了。在查看了许多在线的桌面复制 API 示例后,我没有发现它们与我的任何区别。
这是我的方法来初始化所有内容,没有引发任何错误。
这是我的方法来初始化所有内容,没有引发任何错误。
BOOL init()
{
CHECKHR(D3D11CreateDevice(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, 0, gFeatureLevels, gNumFeatureLevels, D3D11_SDK_VERSION, &lDevice, &FeatureLevel, &lImmediateContext))
IDXGIDevice* lDxgiDevice;
CHECKHR(lDevice->QueryInterface(IID_PPV_ARGS(&lDxgiDevice)))
IDXGIAdapter* lDxgiAdapter;
CHECKHR(lDxgiDevice->GetParent(__uuidof(IDXGIAdapter), (void**)&lDxgiAdapter))
lDxgiDevice->Release();
IDXGIOutput* lDxgiOutput;
CHECKHR(lDxgiAdapter->EnumOutputs(0, &lDxgiOutput))
lDxgiAdapter->Release();
CHECKHR(lDxgiOutput->GetDesc(&OutputDesc))
IDXGIOutput1* lDxgiOutput1;
CHECKHR(lDxgiOutput->QueryInterface(IID_PPV_ARGS(&lDxgiOutput1)))
lDxgiOutput->Release();
CHECKHR(lDxgiOutput1->DuplicateOutput(lDevice, &lDeskDupl))
lDxgiOutput1->Release();
lDeskDupl->GetDesc(&OutputDuplDesc);
D3D11_TEXTURE2D_DESC desc;
desc.Width = OutputDuplDesc.ModeDesc.Width;
desc.Height = OutputDuplDesc.ModeDesc.Height;
desc.Format = OutputDuplDesc.ModeDesc.Format;
desc.ArraySize = 1;
desc.BindFlags = 0;
desc.MiscFlags = 0;
desc.SampleDesc.Count = 1;
desc.SampleDesc.Quality = 0;
desc.MipLevels = 1;
desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ | D3D11_CPU_ACCESS_WRITE;
desc.Usage = D3D11_USAGE_STAGING;
CHECKHR(lDevice->CreateTexture2D(&desc, NULL, &lDestImage))
return TRUE;
}
我正在使用的CHECKHR宏已经由我测试过并且有效,只是为了澄清它不是问题所在。
这是我用来实际获取帧的代码:
int main()
{
init();
HRESULT hr;
IDXGIResource* lDesktopResource;
ID3D11Texture2D* lAcquiredDesktopImage;
DXGI_OUTDUPL_FRAME_INFO FrameInfo;
while (true)
{
if (SUCCEEDED(lDeskDupl->AcquireNextFrame(INFINITE, &FrameInfo, &lDesktopResource)))
{
break;
}
}
hr = lDesktopResource->QueryInterface(IID_PPV_ARGS(&lAcquiredDesktopImage));
if (FAILED(hr))
{
cout << "QueryInterface failed!" << endl;
system("pause");
}
lDesktopResource->Release();
lImmediateContext->CopyResource(lDestImage, lAcquiredDesktopImage);
lAcquiredDesktopImage->Release();
lDeskDupl->ReleaseFrame();
D3D11_MAPPED_SUBRESOURCE resource;
UINT subresource = D3D11CalcSubresource(0, 0, 0);
hr = lImmediateContext->Map(lDestImage, subresource, D3D11_MAP_READ_WRITE, 0, &resource);
if (FAILED(hr))
{
cout << "Map failed!" << endl;
system("pause");
}
BYTE* pb = (BYTE*)(resource.pData);
for (int i = 0; i < 2000000; i++)
{
cout << (int)pb[i] << endl;
}
system("pause");
return 0;
}
所有发生的事情就是向控制台打印2000000个零。我是否遗漏了什么或者看不到什么?
D3D11CreateDevice
调用是错误的。你应该先使用 DXGI 获取适配器指针,然后将显式适配器作为第一个参数调用D3D11CreateDevice
。而不是反过来。 - Roman R.D3D_DRIVER_TYPE_HARDWARE
引起的,您需要将其更改为D3D_DRIVER_TYPE_UNKNOWN
。启用 D3D 调试层 来在调试输出窗口中启用提示。 - Roman R.