How to create an IDWriteTextLayout4?

Question

We create an IDWriteFactory7 CComPtr interface:

CComPtr<IDWriteFactory7>                    _writeFactory;

_hr = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(_writeFactory), reinterpret_cast<IUnknown**>(&_writeFactory));

Creating the Factory works. But if we try to create an IDWriteTextLayout4, with this Factory:

CComPtr<IDWriteTextLayout4> _textLayout;

_writeFactory->CreateTextLayout(
                wtext.c_str(),      // The string to be laid out and formatted.
                wcslen(wtext.c_str()),  // The length of the string.
                _textFormat,  // The text format to apply to the string (contains font information, etc).
                size.width,         // The width of the layout box.
                size.height,        // The height of the layout box.
                &_textLayout  // The IDWriteTextLayout interface pointer.
            );

The CreateTextLayout(..) Method does not work with IDWriteTextLayout4, but instead expects IDWriteTextLayout.

Can anyone provide an example?

What happens if you do _textLayout->QueryInterface for IDWriteTextLayout? — systemcpro, Mar 22 '21 at 14:10
Define `_textLayout` as `IDWriteTextLayout`, call `CreateTextLayout(...)` and then `_textLayout->QueryInterface(&_textLayout4);` — Simon Mourier, Mar 22 '21 at 14:21

score 0 · Answer 1 · answered Mar 22 '21 at 14:38

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Comments of systemcpro and Simon Mourier solved the Problem.

answered Mar 22 '21 at 14:38

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How to create an IDWriteTextLayout4?

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