bool CDirectWriteRenderer::DrawText(
LPCWSTR pText, int Length, const RECT &Rect,
CDirectWriteFont &Font, CDirectWriteBrush &Brush, unsigned int Flags)
{
if (pText == nullptr)
return false;
if (m_pRenderTarget == nullptr)
return false;
bool fOK = false;
IDWriteTextFormat *pTextFormat = Font.GetTextFormat();
if (pTextFormat != nullptr) {
ID2D1Brush *pBrush = Brush.GetBrush();
if (pBrush != nullptr) {
pTextFormat->SetTextAlignment(
(Flags & DRAW_TEXT_ALIGN_HORZ_CENTER) != 0 ?
DWRITE_TEXT_ALIGNMENT_CENTER :
(Flags & DRAW_TEXT_ALIGN_RIGHT) != 0 ?
DWRITE_TEXT_ALIGNMENT_TRAILING :
((Flags & DRAW_TEXT_ALIGN_JUSTIFIED) != 0
&& Util::OS::IsWindows8OrLater()) ?
DWRITE_TEXT_ALIGNMENT_JUSTIFIED :
DWRITE_TEXT_ALIGNMENT_LEADING);
pTextFormat->SetParagraphAlignment(
(Flags & DRAW_TEXT_ALIGN_VERT_CENTER) != 0 ?
DWRITE_PARAGRAPH_ALIGNMENT_CENTER :
(Flags & DRAW_TEXT_ALIGN_BOTTOM) != 0 ?
DWRITE_PARAGRAPH_ALIGNMENT_FAR :
DWRITE_PARAGRAPH_ALIGNMENT_NEAR);
pTextFormat->SetWordWrapping(DWRITE_WORD_WRAPPING_NO_WRAP);
DWRITE_TRIMMING Trimming = {DWRITE_TRIMMING_GRANULARITY_NONE, 0, 0};
pTextFormat->SetTrimming(&Trimming, nullptr);
m_pRenderTarget->DrawText(
pText,
Length >= 0 ? Length : ::lstrlenW(pText),
pTextFormat,
D2DRectF(Rect),
pBrush);
fOK = true;
pBrush->Release();
}
pTextFormat->Release();
}
return fOK;
}
void
DWriteContext::SetFont(const LOGFONTW &logFont)
{
SafeRelease(&mTextFormat);
mLastHFont = NULL;
HRESULT hr = SetLOGFONT(logFont, 0.f);
if (SUCCEEDED(hr))
hr = mTextFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_LEADING);
if (SUCCEEDED(hr))
hr = mTextFormat->SetParagraphAlignment(
DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
if (SUCCEEDED(hr))
hr = mTextFormat->SetWordWrapping(DWRITE_WORD_WRAPPING_NO_WRAP);
}
IDWriteTextFormat* createTextFormat(IDWriteFactory1* writeFactory, const char* fontName, bool alignmentCenterX, bool alignmentCenterY)
{
IDWriteTextFormat* textFormat;
// Create a DirectWrite text format object.
DX::ThrowIfFailed(
writeFactory->CreateTextFormat(
Utils::convertStringToWString(fontName).c_str(),//Gabriola
NULL,
DWRITE_FONT_WEIGHT_REGULAR,
DWRITE_FONT_STYLE_NORMAL,
DWRITE_FONT_STRETCH_NORMAL,
64.f,
L"en-US", // Locale
&textFormat
)
);
// Center the text horizontally and vertically.
textFormat->SetTextAlignment(alignmentCenterX ? DWRITE_TEXT_ALIGNMENT_CENTER : DWRITE_TEXT_ALIGNMENT_LEADING);
textFormat->SetParagraphAlignment(alignmentCenterY ? DWRITE_PARAGRAPH_ALIGNMENT_CENTER : DWRITE_PARAGRAPH_ALIGNMENT_NEAR);
return textFormat;
}
HRESULT SaveToImageFile()
{
HRESULT hr = S_OK;
//
// Create Factories
//
IWICImagingFactory *pWICFactory = NULL;
ID2D1Factory *pD2DFactory = NULL;
IDWriteFactory *pDWriteFactory = NULL;
IWICBitmap *pWICBitmap = NULL;
ID2D1RenderTarget *pRT = NULL;
IDWriteTextFormat *pTextFormat = NULL;
ID2D1PathGeometry *pPathGeometry = NULL;
ID2D1GeometrySink *pSink = NULL;
ID2D1GradientStopCollection *pGradientStops = NULL;
ID2D1LinearGradientBrush *pLGBrush = NULL;
ID2D1SolidColorBrush *pBlackBrush = NULL;
IWICBitmapEncoder *pEncoder = NULL;
IWICBitmapFrameEncode *pFrameEncode = NULL;
IWICStream *pStream = NULL;
hr = CoCreateInstance(
CLSID_WICImagingFactory,
NULL,
CLSCTX_INPROC_SERVER,
IID_IWICImagingFactory,
reinterpret_cast<void **>(&pWICFactory)
);
if (SUCCEEDED(hr))
{
hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory);
}
if (SUCCEEDED(hr))
{
hr = DWriteCreateFactory(
DWRITE_FACTORY_TYPE_SHARED,
__uuidof(pDWriteFactory),
reinterpret_cast<IUnknown **>(&pDWriteFactory)
);
}
//
// Create IWICBitmap and RT
//
static const UINT sc_bitmapWidth = 640;
static const UINT sc_bitmapHeight = 480;
if (SUCCEEDED(hr))
{
hr = pWICFactory->CreateBitmap(
sc_bitmapWidth,
sc_bitmapHeight,
GUID_WICPixelFormat32bppBGR,
WICBitmapCacheOnLoad,
&pWICBitmap
);
}
if (SUCCEEDED(hr))
{
hr = pD2DFactory->CreateWicBitmapRenderTarget(
pWICBitmap,
D2D1::RenderTargetProperties(),
&pRT
);
}
if (SUCCEEDED(hr))
{
//
// Create text format
//
static const WCHAR sc_fontName[] = L"Calibri";
static const FLOAT sc_fontSize = 50;
hr = pDWriteFactory->CreateTextFormat(
sc_fontName,
NULL,
DWRITE_FONT_WEIGHT_NORMAL,
DWRITE_FONT_STYLE_NORMAL,
DWRITE_FONT_STRETCH_NORMAL,
sc_fontSize,
L"", //locale
&pTextFormat
);
}
if (SUCCEEDED(hr))
{
pTextFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_CENTER);
pTextFormat->SetParagraphAlignment(DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
//
// Create a path geometry representing an hour glass
//
hr = pD2DFactory->CreatePathGeometry(&pPathGeometry);
}
if (SUCCEEDED(hr))
{
hr = pPathGeometry->Open(&pSink);
}
if (SUCCEEDED(hr))
{
pSink->SetFillMode(D2D1_FILL_MODE_ALTERNATE);
pSink->BeginFigure(
D2D1::Point2F(0, 0),
D2D1_FIGURE_BEGIN_FILLED
);
pSink->AddLine(D2D1::Point2F(200, 0));
pSink->AddBezier(
D2D1::BezierSegment(
D2D1::Point2F(150, 50),
D2D1::Point2F(150, 150),
D2D1::Point2F(200, 200))
);
pSink->AddLine(D2D1::Point2F(0, 200));
pSink->AddBezier(
D2D1::BezierSegment(
D2D1::Point2F(50, 150),
D2D1::Point2F(50, 50),
D2D1::Point2F(0, 0))
);
pSink->EndFigure(D2D1_FIGURE_END_CLOSED);
hr = pSink->Close();
}
if (SUCCEEDED(hr))
{
//
// Create a linear-gradient brush
//
static const D2D1_GRADIENT_STOP stops[] =
{
{ 0.f, { 0.f, 1.f, 1.f, 1.f } },
{ 1.f, { 0.f, 0.f, 1.f, 1.f } },
};
hr = pRT->CreateGradientStopCollection(
stops,
ARRAYSIZE(stops),
&pGradientStops
);
}
if (SUCCEEDED(hr))
{
hr = pRT->CreateLinearGradientBrush(
D2D1::LinearGradientBrushProperties(
D2D1::Point2F(100, 0),
D2D1::Point2F(100, 200)),
D2D1::BrushProperties(),
pGradientStops,
&pLGBrush
);
}
if (SUCCEEDED(hr))
{
hr = pRT->CreateSolidColorBrush(
D2D1::ColorF(D2D1::ColorF::Black),
&pBlackBrush
);
}
if (SUCCEEDED(hr))
{
//
// Render into the bitmap
//
pRT->BeginDraw();
pRT->Clear(D2D1::ColorF(D2D1::ColorF::White));
D2D1_SIZE_F rtSize = pRT->GetSize();
// Set the world transform to a 45 degree rotation at the center of the render target
// and write "Hello, World".
pRT->SetTransform(
D2D1::Matrix3x2F::Rotation(
45,
D2D1::Point2F(
rtSize.width / 2,
rtSize.height / 2))
);
static const WCHAR sc_helloWorld[] = L"Hello, World!";
pRT->DrawText(
sc_helloWorld,
ARRAYSIZE(sc_helloWorld) - 1,
pTextFormat,
D2D1::RectF(0, 0, rtSize.width, rtSize.height),
pBlackBrush);
//
// Reset back to the identity transform
//
pRT->SetTransform(D2D1::Matrix3x2F::Translation(0, rtSize.height - 200));
pRT->FillGeometry(pPathGeometry, pLGBrush);
pRT->SetTransform(D2D1::Matrix3x2F::Translation(rtSize.width - 200, 0));
pRT->FillGeometry(pPathGeometry, pLGBrush);
hr = pRT->EndDraw();
}
if (SUCCEEDED(hr))
{
//
// Save image to file
//
hr = pWICFactory->CreateStream(&pStream);
}
WICPixelFormatGUID format = GUID_WICPixelFormatDontCare;
if (SUCCEEDED(hr))
{
static const WCHAR filename[] = L"output.png";
hr = pStream->InitializeFromFilename(filename, GENERIC_WRITE);
}
if (SUCCEEDED(hr))
{
hr = pWICFactory->CreateEncoder(GUID_ContainerFormatPng, NULL, &pEncoder);
}
if (SUCCEEDED(hr))
{
hr = pEncoder->Initialize(pStream, WICBitmapEncoderNoCache);
}
if (SUCCEEDED(hr))
{
hr = pEncoder->CreateNewFrame(&pFrameEncode, NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->Initialize(NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->SetSize(sc_bitmapWidth, sc_bitmapHeight);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->SetPixelFormat(&format);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->WriteSource(pWICBitmap, NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->Commit();
}
if (SUCCEEDED(hr))
{
hr = pEncoder->Commit();
}
SafeRelease(&pWICFactory);
SafeRelease(&pD2DFactory);
SafeRelease(&pDWriteFactory);
SafeRelease(&pWICBitmap);
SafeRelease(&pRT);
SafeRelease(&pTextFormat);
SafeRelease(&pPathGeometry);
SafeRelease(&pSink);
SafeRelease(&pGradientStops);
SafeRelease(&pLGBrush);
SafeRelease(&pBlackBrush);
SafeRelease(&pEncoder);
SafeRelease(&pFrameEncode);
SafeRelease(&pStream);
return hr;
}
HRESULT SaveToImageFile(PlotData **data
, unsigned int imageWidth, unsigned int imageHeight
, float rangeX, float rangeY
, float leftMargin, float bottomMargin
, float xTick, float yTick)
{
HRESULT hr = S_OK;
//
// Create Factories
//
IWICImagingFactory *pWICFactory = NULL;
ID2D1Factory *pD2DFactory = NULL;
IDWriteFactory *pDWriteFactory = NULL;
IWICBitmap *pWICBitmap = NULL;
ID2D1RenderTarget *pRT = NULL;
IDWriteTextFormat *pTextFormat = NULL;
ID2D1SolidColorBrush *pSolidBrush = NULL;
IWICBitmapEncoder *pEncoder = NULL;
IWICBitmapFrameEncode *pFrameEncode = NULL;
IWICStream *pStream = NULL;
hr = CoCreateInstance(
CLSID_WICImagingFactory,
NULL,
CLSCTX_INPROC_SERVER,
IID_IWICImagingFactory,
reinterpret_cast<void **>(&pWICFactory)
);
if (SUCCEEDED(hr))
{
hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory);
}
if (SUCCEEDED(hr))
{
hr = DWriteCreateFactory(
DWRITE_FACTORY_TYPE_SHARED,
__uuidof(pDWriteFactory),
reinterpret_cast<IUnknown **>(&pDWriteFactory)
);
}
//
// Create IWICBitmap and RT
//
if (SUCCEEDED(hr))
{
hr = pWICFactory->CreateBitmap(
imageWidth,
imageHeight,
GUID_WICPixelFormat32bppBGR,
WICBitmapCacheOnLoad,
&pWICBitmap
);
}
if (SUCCEEDED(hr))
{
hr = pD2DFactory->CreateWicBitmapRenderTarget(
pWICBitmap,
D2D1::RenderTargetProperties(),
&pRT
);
}
if (SUCCEEDED(hr))
{
//
// Create text format
//
static const WCHAR sc_fontName[] = L"Arial";
static const FLOAT sc_fontSize = 20;
hr = pDWriteFactory->CreateTextFormat(
sc_fontName,
NULL,
DWRITE_FONT_WEIGHT_NORMAL,
DWRITE_FONT_STYLE_NORMAL,
DWRITE_FONT_STRETCH_NORMAL,
sc_fontSize,
L"", //locale
&pTextFormat
);
}
if (SUCCEEDED(hr))
{
pTextFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_CENTER);
pTextFormat->SetParagraphAlignment(DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
//
// Create a path geometry representing an hour glass
//
}
if (SUCCEEDED(hr))
{
hr = pRT->CreateSolidColorBrush(
D2D1::ColorF(D2D1::ColorF::Black),
&pSolidBrush
);
}
if (SUCCEEDED(hr))
{
//
// Render into the bitmap
//
pRT->BeginDraw();
pRT->Clear(D2D1::ColorF(D2D1::ColorF::White));
D2D1_SIZE_F rtSize = pRT->GetSize();
//static const WCHAR sc_helloWorld[] = L"Hello, World!";
//pRT->DrawText(
// sc_helloWorld,
// ARRAYSIZE(sc_helloWorld) - 1,
// pTextFormat,
// D2D1::RectF(0, 0, rtSize.width, rtSize.height),
// pBlackBrush);
float scaleX = (rtSize.width - leftMargin) / rangeX;
float scaleY = (rtSize.height - bottomMargin) / rangeY;
//
// Reset back to the identity transform
//
pRT->DrawLine(D2D1::Point2F(leftMargin, 0.0f), D2D1::Point2F(leftMargin, rtSize.height - bottomMargin), pSolidBrush);
pRT->DrawLine(D2D1::Point2F(leftMargin, rtSize.height - bottomMargin), D2D1::Point2F(rtSize.width, rtSize.height - bottomMargin), pSolidBrush);
pSolidBrush->SetColor(D2D1::ColorF(D2D1::ColorF::LightGray, 0.4f));
size_t countTicks = rangeY / yTick;
for(size_t tick = 1; tick <= countTicks; ++tick)
{
float y = rtSize.height - bottomMargin - static_cast<float>(tick) * yTick * scaleY;
pRT->DrawLine(D2D1::Point2F(leftMargin - 3.0f, y), D2D1::Point2F(rtSize.width, y), pSolidBrush);
}
countTicks = rangeX / xTick;
for(size_t tick = 1; tick <= countTicks; ++tick)
{
float x = leftMargin + static_cast<float>(tick) * xTick * scaleX;
pRT->DrawLine(D2D1::Point2F(x, 0.0f), D2D1::Point2F(x, rtSize.height - bottomMargin + 3.0f), pSolidBrush);
}
//D2D1_MATRIX_3X2_F rotation = D2D1::Matrix3x2F::Rotation(-90.0f);
D2D1_MATRIX_3X2_F translation = D2D1::Matrix3x2F::Translation(leftMargin, rtSize.height - bottomMargin);
//D2D1_MATRIX_3X2_F scale = D2D1::Matrix3x2F::Scale(D2D1::SizeF(600.0f, 1.0f));
pRT->SetTransform(translation);
GraphData(data, pD2DFactory, pRT, pSolidBrush, scaleX, scaleY );
hr = pRT->EndDraw();
}
if (SUCCEEDED(hr))
{
//
// Save image to file
//
hr = pWICFactory->CreateStream(&pStream);
}
WICPixelFormatGUID format = GUID_WICPixelFormatDontCare;
if (SUCCEEDED(hr))
{
static const WCHAR filename[] = L"output.png";
hr = pStream->InitializeFromFilename(filename, GENERIC_WRITE);
}
if (SUCCEEDED(hr))
{
hr = pWICFactory->CreateEncoder(GUID_ContainerFormatPng, NULL, &pEncoder);
}
if (SUCCEEDED(hr))
{
hr = pEncoder->Initialize(pStream, WICBitmapEncoderNoCache);
}
if (SUCCEEDED(hr))
{
hr = pEncoder->CreateNewFrame(&pFrameEncode, NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->Initialize(NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->SetSize(imageWidth, imageHeight);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->SetPixelFormat(&format);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->WriteSource(pWICBitmap, NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->Commit();
}
if (SUCCEEDED(hr))
{
hr = pEncoder->Commit();
}
SafeRelease(&pWICFactory);
SafeRelease(&pD2DFactory);
SafeRelease(&pDWriteFactory);
SafeRelease(&pWICBitmap);
SafeRelease(&pRT);
SafeRelease(&pTextFormat);
SafeRelease(&pSolidBrush);
SafeRelease(&pEncoder);
SafeRelease(&pFrameEncode);
SafeRelease(&pStream);
return hr;
}
int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr = S_OK;
// Create a Direct2D factory.
CHECKHR(D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &g_pD2DFactory));
// Create a DirectWrite factory.
CHECKHR(DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory),
reinterpret_cast<IUnknown**>(&g_pDWriteFactory)));
// Create a WIC factory
IWICImagingFactory* pWICFactory = NULL;
CHECKHR(CoInitialize(nullptr));
CHECKHR(CoCreateInstance(CLSID_WICImagingFactory1, nullptr, CLSCTX_INPROC_SERVER,
IID_IWICImagingFactory, (LPVOID*)&pWICFactory));
// Create an IWICBitmap and RT
IWICBitmap* pWICBitmap = NULL;
static const UINT sc_bitmapWidth = 640;
static const UINT sc_bitmapHeight = 480;
CHECKHR(pWICFactory->CreateBitmap(sc_bitmapWidth, sc_bitmapHeight, GUID_WICPixelFormat32bppBGR,
WICBitmapCacheOnLoad,
&pWICBitmap));
// Set the render target type to D2D1_RENDER_TARGET_TYPE_DEFAULT to use software rendering.
CHECKHR(g_pD2DFactory->CreateWicBitmapRenderTarget(
pWICBitmap, D2D1::RenderTargetProperties(), &g_pRenderTarget));
// Create text format and a path geometry representing an hour glass.
IDWriteTextFormat* pTextFormat = NULL;
static const WCHAR sc_fontName[] = L"Calibri";
static const FLOAT sc_fontSize = 50;
CHECKHR(g_pDWriteFactory->CreateTextFormat(
sc_fontName,
NULL,
DWRITE_FONT_WEIGHT_NORMAL,
DWRITE_FONT_STYLE_NORMAL,
DWRITE_FONT_STRETCH_NORMAL,
sc_fontSize,
L"", //locale
&pTextFormat
));
CHECKHR(pTextFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_CENTER));
CHECKHR(pTextFormat->SetParagraphAlignment(DWRITE_PARAGRAPH_ALIGNMENT_CENTER));
// Create a path geometry
ID2D1PathGeometry* pPathGeometry = NULL;
ID2D1GeometrySink* pSink = NULL;
CHECKHR(g_pD2DFactory->CreatePathGeometry(&pPathGeometry));
CHECKHR(pPathGeometry->Open(&pSink));
pSink->SetFillMode(D2D1_FILL_MODE_ALTERNATE);
pSink->BeginFigure(
D2D1::Point2F(0, 0),
D2D1_FIGURE_BEGIN_FILLED
);
pSink->AddLine(D2D1::Point2F(200, 0));
pSink->AddBezier(
D2D1::BezierSegment(
D2D1::Point2F(150, 50),
D2D1::Point2F(150, 150),
D2D1::Point2F(200, 200))
);
pSink->AddLine(D2D1::Point2F(0, 200));
pSink->AddBezier(
D2D1::BezierSegment(
D2D1::Point2F(50, 150),
D2D1::Point2F(50, 50),
D2D1::Point2F(0, 0))
);
pSink->EndFigure(D2D1_FIGURE_END_CLOSED);
CHECKHR(pSink->Close());
// Create GradientStopCollection
ID2D1GradientStopCollection *pGradientStops = NULL;
static const D2D1_GRADIENT_STOP stops[] =
{
{ 0.f, { 0.f, 1.f, 1.f, 1.f } },
{ 1.f, { 0.f, 0.f, 1.f, 1.f } },
};
CHECKHR(g_pRenderTarget->CreateGradientStopCollection(
stops,
ARRAYSIZE(stops),
&pGradientStops
));
ID2D1LinearGradientBrush* pLGBrush = NULL;
ID2D1SolidColorBrush* pBlackBrush = NULL;
CHECKHR(g_pRenderTarget->CreateLinearGradientBrush(
D2D1::LinearGradientBrushProperties(
D2D1::Point2F(100, 0),
D2D1::Point2F(100, 200)),
D2D1::BrushProperties(),
pGradientStops,
&pLGBrush
));
CHECKHR(g_pRenderTarget->CreateSolidColorBrush(
D2D1::ColorF(D2D1::ColorF::Black),
&pBlackBrush
));
// Render into the bitmap.
g_pRenderTarget->BeginDraw();
g_pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));
D2D1_SIZE_F rtSize = g_pRenderTarget->GetSize();
// Set the world transform to a 45 degree rotation at the center of the render target
// and write "Hello, World".
g_pRenderTarget->SetTransform(
D2D1::Matrix3x2F::Rotation(
45,
D2D1::Point2F(
rtSize.width / 2,
rtSize.height / 2))
);
static const WCHAR sc_helloWorld[] = L"Hello, World!";
g_pRenderTarget->DrawText(
sc_helloWorld,
ARRAYSIZE(sc_helloWorld) - 1,
pTextFormat,
D2D1::RectF(0, 0, rtSize.width, rtSize.height),
pBlackBrush);
// Reset back to the identity transform.
g_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Translation(0, rtSize.height - 200));
g_pRenderTarget->FillGeometry(pPathGeometry, pLGBrush);
g_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Translation(rtSize.width - 200, 0));
g_pRenderTarget->FillGeometry(pPathGeometry, pLGBrush);
CHECKHR(g_pRenderTarget->EndDraw());
// Save the image to a file.
IWICStream* pStream = NULL;
CHECKHR(pWICFactory->CreateStream(&pStream));
// Use InitializeFromFilename to write to a file. If there is need to write inside the memory, use InitializeFromMemory.
static const WCHAR filename[] = L"output.png";
CHECKHR(pStream->InitializeFromFilename(filename, GENERIC_WRITE));
IWICBitmapEncoder* pEncoder = NULL;
CHECKHR(pWICFactory->CreateEncoder(GUID_ContainerFormatPng, NULL, &pEncoder));
CHECKHR(pEncoder->Initialize(pStream, WICBitmapEncoderNoCache));
IWICBitmapFrameEncode* pFrameEncode = NULL;
CHECKHR(pEncoder->CreateNewFrame(&pFrameEncode, NULL));
// Use IWICBitmapFrameEncode to encode the bitmap into the picture format you want.
CHECKHR(pFrameEncode->Initialize(NULL));
CHECKHR(pFrameEncode->SetSize(sc_bitmapWidth, sc_bitmapHeight));
WICPixelFormatGUID format = GUID_WICPixelFormatDontCare;
CHECKHR(pFrameEncode->SetPixelFormat(&format));
CHECKHR(pFrameEncode->WriteSource(pWICBitmap, NULL));
CHECKHR(pFrameEncode->Commit());
CHECKHR(pEncoder->Commit());
return 0;
}