Simon Mourier's Blog - How to Properly Use and Instantiate existing Preview Handlers

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How to Properly Use and Instantiate existing Preview Handlers

May 31, 2022 See the question and my original answer on StackOverflow

You just need to add a SetRect call after initialization:

RECT rect;
GetClientRect(window, &rect);
iPreviewHandler->SetWindow(window, &rect);
iPreviewHandler->DoPreview();

// add this
iPreviewHandler->SetRect(&rect);