我使用桌面复制API(DirectX11)捕获屏幕。 DuplicateOutput API返回访问被拒绝错误,并且在登录屏幕上的Windows 8.1计算机上发生这种情况非常罕见(可能是10%),尽管我的应用程序正在以SYSTEM级别权限运行并正确调用SetThreadDesktop。我曾经在我收到的每一个错误之后重置并调用SetThreadDesktop,但是即使在多个设备重置和插入之后,应用程序也无法从错误中恢复。在多次重试或重启应用程序之后,我不得不回退到GDI(应用程序在从directx切换到GDI之后工作正常),但这个想法看起来很糟糕。
注意:我确实在Windows 10 / Windows 8计算机上遇到了同样的问题,但与特定的Windows 8.1计算机相比并不常见。
here是E_ACCESSDENIED错误的描述,该错误仅告知此错误可能的情况(没有系统级权限或SetThreadDesktop未正确调用)。我尝试了所有可能的方法来找出问题,但无法解决。
任何帮助将不胜感激,提前致谢。
以下是启动设备的代码:
//
// Initialize duplication interfaces
//
HRESULT cDuplicationManager::InitDupl(_In_ ID3D11Device* Device, _In_ IDXGIAdapter *_pAdapter, _In_ IDXGIOutput *_pOutput, _In_ UINT Output)
{
HRESULT hr = E_FAIL;
if(!_pOutput || !_pAdapter || !Device)
{
return hr;
}
m_OutputNumber = Output;
// Take a reference on the device
m_Device = Device;
m_Device->AddRef();
_pOutput->GetDesc(&m_OutputDesc);
// QI for Output 1
IDXGIOutput1* DxgiOutput1 = nullptr;
hr = _pOutput->QueryInterface(__uuidof(DxgiOutput1), reinterpret_cast<void**>(&DxgiOutput1));
if (FAILED(hr))
{
return ProcessFailure(nullptr, _T("Failed to QI for DxgiOutput1 in DUPLICATIONMANAGER"), _T("Error"), hr);
}
// Create desktop duplication
hr = DxgiOutput1->DuplicateOutput(m_Device, &m_DeskDupl);
DxgiOutput1->Release();
DxgiOutput1 = nullptr;
if (FAILED(hr) || !m_DeskDupl)
{
if (hr == DXGI_ERROR_NOT_CURRENTLY_AVAILABLE)
{
return ProcessFailure(nullptr, _T("Maximum number of applications using Desktop Duplication API"), _T("Error"), hr);
}
return ProcessFailure(m_Device, _T("Failed to get duplicate output in DUPLICATIONMANAGER"), _T("Error"), hr);//, CreateDuplicationExpectedErrors);
}
return S_OK;
}
将桌面设置为当前线程的代码:
DWORD setCurrentInputDesktop()
{
DWORD errorCode = ERROR_ACCESS_DENIED;
HDESK currentInputDesktop = OpenInputDesktop(0, false, GENERIC_ALL);
if(currentInputDesktop != NULL)
{
if(!SetThreadDesktop(currentInputDesktop))
{
errorCode = GetLastError();
cout << ("setCurrentInputDesktop: SetThreadDesktop failed. Error code: ") << errorCode;
}
else
{
errorCode = ERROR_SUCCESS;
cout << ("setCurrentInputDesktop: SetThreadDesktop succeeded.");
}
CloseDesktop(currentInputDesktop);
}
else
{
errorCode = GetLastError();
cout << "setCurrentInputDesktop: OpenInputDesktop failed. Error code: " << errorCode;
}
return errorCode;
}
以下是处理错误代码后返回的错误消息:
Id3d11DuplicationManager :: ProcessFailure - 错误:无法获取 DUPLICATIONMANAGER中的重复输出,详细信息:访问被拒绝。