win32 - 使用Desktop Duplication API复制桌面图像
该代码来源于codeproject,经过测试发现,在屏幕处于旋转的情况下捕获的图像是黑色的。暂时没有找到原因。
代码开箱即用,
#define WIN32_LEAN_AND_MEAN #include <windows.h>
#include <shlobj.h>
#include <shellapi.h>
#include <dxgi1_2.h>
#include <d3d11.h>
#include <memory>
#include <algorithm>
#include <string> #pragma comment(lib, "D3D11.lib") template <typename T>
class CComPtrCustom
{
public: CComPtrCustom(T *aPtrElement)
:element(aPtrElement)
{
} CComPtrCustom()
:element(nullptr)
{
} virtual ~CComPtrCustom()
{
Release();
} T* Detach()
{
auto lOutPtr = element; element = nullptr; return lOutPtr;
} T* detach()
{
return Detach();
} void Release()
{
if (element == nullptr)
return; auto k = element->Release(); element = nullptr;
} CComPtrCustom& operator = (T *pElement)
{
Release(); if (pElement == nullptr)
return *this; auto k = pElement->AddRef(); element = pElement; return *this;
} void Swap(CComPtrCustom& other)
{
T* pTemp = element;
element = other.element;
other.element = pTemp;
} T* operator->()
{
return element;
} operator T*()
{
return element;
} operator T*() const
{
return element;
} T* get()
{
return element;
} T* get() const
{
return element;
} T** operator &()
{
return &element;
} bool operator !()const
{
return element == nullptr;
} operator bool()const
{
return element != nullptr;
} bool operator == (const T *pElement)const
{
return element == pElement;
} CComPtrCustom(const CComPtrCustom& aCComPtrCustom)
{
if (aCComPtrCustom.operator!())
{
element = nullptr; return;
} element = aCComPtrCustom; auto h = element->AddRef(); h++;
} CComPtrCustom& operator = (const CComPtrCustom& aCComPtrCustom)
{
Release(); element = aCComPtrCustom; auto k = element->AddRef(); return *this;
} _Check_return_ HRESULT CopyTo(T** ppT) throw()
{
if (ppT == NULL)
return E_POINTER; *ppT = element; if (element)
element->AddRef(); return S_OK;
} HRESULT CoCreateInstance(const CLSID aCLSID)
{
T* lPtrTemp; auto lresult = ::CoCreateInstance(aCLSID, NULL, CLSCTX_INPROC, IID_PPV_ARGS(&lPtrTemp)); if (SUCCEEDED(lresult))
{
if (lPtrTemp != nullptr)
{
Release(); element = lPtrTemp;
} } return lresult;
} protected: T* element;
}; // Driver types supported
D3D_DRIVER_TYPE gDriverTypes[] =
{
D3D_DRIVER_TYPE_HARDWARE
};
UINT gNumDriverTypes = ARRAYSIZE(gDriverTypes); // Feature levels supported
D3D_FEATURE_LEVEL gFeatureLevels[] =
{
D3D_FEATURE_LEVEL_11_0,
D3D_FEATURE_LEVEL_10_1,
D3D_FEATURE_LEVEL_10_0,
D3D_FEATURE_LEVEL_9_1
}; UINT gNumFeatureLevels = ARRAYSIZE(gFeatureLevels); int main()
{
CComPtrCustom<ID3D11Device> lDevice;
CComPtrCustom<ID3D11DeviceContext> lImmediateContext;
CComPtrCustom<IDXGIOutputDuplication> lDeskDupl;
CComPtrCustom<ID3D11Texture2D> lAcquiredDesktopImage;
CComPtrCustom<ID3D11Texture2D> lGDIImage;
CComPtrCustom<ID3D11Texture2D> lDestImage;
DXGI_OUTPUT_DESC lOutputDesc;
DXGI_OUTDUPL_DESC lOutputDuplDesc; int lresult(-1); do
{ D3D_FEATURE_LEVEL lFeatureLevel; HRESULT hr(E_FAIL); // Create device
for (UINT DriverTypeIndex = 0; DriverTypeIndex < gNumDriverTypes; ++DriverTypeIndex)
{
hr = D3D11CreateDevice(
nullptr,
gDriverTypes[DriverTypeIndex],
nullptr,
0,
gFeatureLevels,
gNumFeatureLevels,
D3D11_SDK_VERSION,
&lDevice,
&lFeatureLevel,
&lImmediateContext); if (SUCCEEDED(hr))
{
// Device creation success, no need to loop anymore
break;
} lDevice.Release(); lImmediateContext.Release();
} if (FAILED(hr))
break; Sleep(100); if (lDevice == nullptr)
break; // Get DXGI device
CComPtrCustom<IDXGIDevice> lDxgiDevice; hr = lDevice->QueryInterface(IID_PPV_ARGS(&lDxgiDevice)); if (FAILED(hr))
break; // Get DXGI adapter
CComPtrCustom<IDXGIAdapter> lDxgiAdapter;
hr = lDxgiDevice->GetParent(
__uuidof(IDXGIAdapter),
reinterpret_cast<void**>(&lDxgiAdapter)); if (FAILED(hr))
break; lDxgiDevice.Release(); UINT Output = 0; // Get output
CComPtrCustom<IDXGIOutput> lDxgiOutput;
hr = lDxgiAdapter->EnumOutputs(
Output,
&lDxgiOutput); if (FAILED(hr))
break; lDxgiAdapter.Release(); hr = lDxgiOutput->GetDesc(
&lOutputDesc); if (FAILED(hr))
break; // QI for Output 1
CComPtrCustom<IDXGIOutput1> lDxgiOutput1; hr = lDxgiOutput->QueryInterface(IID_PPV_ARGS(&lDxgiOutput1)); if (FAILED(hr))
break; lDxgiOutput.Release(); // Create desktop duplication
hr = lDxgiOutput1->DuplicateOutput(
lDevice,
&lDeskDupl); if (FAILED(hr))
break; lDxgiOutput1.Release(); // Create GUI drawing texture
lDeskDupl->GetDesc(&lOutputDuplDesc); D3D11_TEXTURE2D_DESC desc; desc.Width = lOutputDuplDesc.ModeDesc.Width; desc.Height = lOutputDuplDesc.ModeDesc.Height; desc.Format = lOutputDuplDesc.ModeDesc.Format; desc.ArraySize = 1; desc.BindFlags = D3D11_BIND_FLAG::D3D11_BIND_RENDER_TARGET; desc.MiscFlags = D3D11_RESOURCE_MISC_GDI_COMPATIBLE; desc.SampleDesc.Count = 1; desc.SampleDesc.Quality = 0; desc.MipLevels = 1; desc.CPUAccessFlags = 0; desc.Usage = D3D11_USAGE_DEFAULT; hr = lDevice->CreateTexture2D(&desc, NULL, &lGDIImage); if (FAILED(hr))
break; if (lGDIImage == nullptr)
break; // Create CPU access texture desc.Width = lOutputDuplDesc.ModeDesc.Width; desc.Height = lOutputDuplDesc.ModeDesc.Height; desc.Format = lOutputDuplDesc.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; hr = lDevice->CreateTexture2D(&desc, NULL, &lDestImage); if (FAILED(hr))
break; if (lDestImage == nullptr)
break; CComPtrCustom<IDXGIResource> lDesktopResource;
DXGI_OUTDUPL_FRAME_INFO lFrameInfo; int lTryCount = 4; do
{ Sleep(100); // Get new frame
hr = lDeskDupl->AcquireNextFrame(
250,
&lFrameInfo,
&lDesktopResource); if (SUCCEEDED(hr))
break; if (hr == DXGI_ERROR_WAIT_TIMEOUT)
{
continue;
}
else if (FAILED(hr))
break; } while (--lTryCount > 0); if (FAILED(hr))
break; // QI for ID3D11Texture2D hr = lDesktopResource->QueryInterface(IID_PPV_ARGS(&lAcquiredDesktopImage)); if (FAILED(hr))
break; lDesktopResource.Release(); if (lAcquiredDesktopImage == nullptr)
break; // Copy image into GDI drawing texture lImmediateContext->CopyResource(lGDIImage, lAcquiredDesktopImage); // Draw cursor image into GDI drawing texture CComPtrCustom<IDXGISurface1> lIDXGISurface1; hr = lGDIImage->QueryInterface(IID_PPV_ARGS(&lIDXGISurface1)); if (FAILED(hr))
break; CURSORINFO lCursorInfo = { 0 }; lCursorInfo.cbSize = sizeof(lCursorInfo); auto lBoolres = GetCursorInfo(&lCursorInfo); if (lBoolres == TRUE)
{
if (lCursorInfo.flags == CURSOR_SHOWING)
{
auto lCursorPosition = lCursorInfo.ptScreenPos; auto lCursorSize = lCursorInfo.cbSize; HDC lHDC; lIDXGISurface1->GetDC(FALSE, &lHDC); DrawIconEx(
lHDC,
lCursorPosition.x,
lCursorPosition.y,
lCursorInfo.hCursor,
0,
0,
0,
0,
DI_NORMAL | DI_DEFAULTSIZE); lIDXGISurface1->ReleaseDC(nullptr);
} } // Copy image into CPU access texture lImmediateContext->CopyResource(lDestImage, lGDIImage); // Copy from CPU access texture to bitmap buffer D3D11_MAPPED_SUBRESOURCE resource;
UINT subresource = D3D11CalcSubresource(0, 0, 0);
lImmediateContext->Map(lDestImage, subresource, D3D11_MAP_READ_WRITE, 0, &resource); BITMAPINFO lBmpInfo; // BMP 32 bpp ZeroMemory(&lBmpInfo, sizeof(BITMAPINFO)); lBmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); lBmpInfo.bmiHeader.biBitCount = 32; lBmpInfo.bmiHeader.biCompression = BI_RGB; lBmpInfo.bmiHeader.biWidth = lOutputDuplDesc.ModeDesc.Width; lBmpInfo.bmiHeader.biHeight = lOutputDuplDesc.ModeDesc.Height; lBmpInfo.bmiHeader.biPlanes = 1; lBmpInfo.bmiHeader.biSizeImage = lOutputDuplDesc.ModeDesc.Width
* lOutputDuplDesc.ModeDesc.Height * 4; std::unique_ptr<BYTE> pBuf(new BYTE[lBmpInfo.bmiHeader.biSizeImage]); UINT lBmpRowPitch = lOutputDuplDesc.ModeDesc.Width * 4; BYTE* sptr = reinterpret_cast<BYTE*>(resource.pData);
BYTE* dptr = pBuf.get() + lBmpInfo.bmiHeader.biSizeImage - lBmpRowPitch; UINT lRowPitch = std::min<UINT>(lBmpRowPitch, resource.RowPitch); for (size_t h = 0; h < lOutputDuplDesc.ModeDesc.Height; ++h)
{ memcpy_s(dptr, lBmpRowPitch, sptr, lRowPitch);
sptr += resource.RowPitch;
dptr -= lBmpRowPitch;
} // Save bitmap buffer into the file ScreenShot.bmp WCHAR lMyDocPath[MAX_PATH]; hr = SHGetFolderPath(nullptr, CSIDL_PERSONAL, nullptr, SHGFP_TYPE_CURRENT, lMyDocPath); if (FAILED(hr))
break; std::wstring lFilePath = std::wstring(lMyDocPath) + L"\\ScreenShot.bmp"; FILE* lfile = nullptr; auto lerr = _wfopen_s(&lfile, lFilePath.c_str(), L"wb"); if (lerr != 0)
break; if (lfile != nullptr)
{ BITMAPFILEHEADER bmpFileHeader; bmpFileHeader.bfReserved1 = 0;
bmpFileHeader.bfReserved2 = 0;
bmpFileHeader.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + lBmpInfo.bmiHeader.biSizeImage;
bmpFileHeader.bfType = 'MB';
bmpFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); fwrite(&bmpFileHeader, sizeof(BITMAPFILEHEADER), 1, lfile);
fwrite(&lBmpInfo.bmiHeader, sizeof(BITMAPINFOHEADER), 1, lfile);
fwrite(pBuf.get(), lBmpInfo.bmiHeader.biSizeImage, 1, lfile); fclose(lfile); ShellExecute(0, 0, lFilePath.c_str(), 0, 0, SW_SHOW); lresult = 0; } } while (false); return lresult;
}
如果需要录屏,可以参考另一个文章:screen-recorder
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