Question

我很难理解我是如何创建一个可以传递到CreateTextFormat函数的字体集合。

确切的问题是要了解其中的集合关键部分：http://msdn.microsoft.com/en-us/library/windows/desktop/dd368186(v=vs.85).aspx

到目前为止，这是我的代码，我只是对集合键进行了疯狂的猜测，因为我根本不理解它...

// Vars

IDWriteFontFace* pFontFace;
IDWriteFontFile* pFontFiles;
IDWriteFontCollection* pFontCollection;
IDWriteFontCollection* fontCollection;
IDWriteFontCollectionLoader* collectionLoader;
IDWriteFontFileEnumerator* fileEnumerator;

// Set up font

HRESULT hr;

// Gets a filename from a application directory

hr = dWriteFactory->CreateFontFileReference(
    L"Assets/Fonts/PontanoSans-Regular.ttf",
    NULL,
    &pFontFiles );

IDWriteFontFile* fontFileArray[] = { pFontFiles };

if( SUCCEEDED( hr ) )
{
    hr = dWriteFactory->CreateFontFace(
        DWRITE_FONT_FACE_TYPE_TRUETYPE,
        1, // file count
        fontFileArray,
        0,
        DWRITE_FONT_SIMULATIONS_NONE,
        &pFontFace
        );
}

// Get the system font collection. BUT I DONT GET THIS PART ARGHHHH
if( SUCCEEDED( hr ) )
{
    collectionLoader->CreateEnumeratorFromKey( pDWriteFactory, pFontFiles, 1, &fileEnumerator );
    hr = pDWriteFactory->CreateCustomFontCollection( collectionLoader, fileEnumerator, 1, &fontCollection );
}

它在这里使用：

// Create device independent resources
hr = dWriteFactory->CreateTextFormat(
    L"Pontano Sans",
    fontCollection, // HERE HERE HERE!
    DWRITE_FONT_WEIGHT_EXTRA_BOLD,
    DWRITE_FONT_STYLE_NORMAL,
    DWRITE_FONT_STRETCH_NORMAL,
    fontSize,
    L"en-US",
    &textFormat
    );

修改::::: 我不确定我是否得到了无效指针的东西，我是否在正确的轨道上：？

    int key;
    void *pVoid = &key;
    collectionLoader->CreateEnumeratorFromKey( pDWriteFactory, pVoid, sizeof(int), &fileEnumerator );
    hr = pDWriteFactory->CreateCustomFontCollection( collectionLoader, pVoid, 1, &fontCollection );

尝试使用DirectX使用自定义字体文件 - 什么是集合键？

0 个答案: