mfc 可以在控件上画框，并可以获取框的坐标信息

[{"title":"（ 45 个子文件 64.48MB ） mfc 可以在控件上画框，并可以获取框的坐标信息","children":[{"title":"test,画框可获取坐标信息","children":[{"title":"test.sdf <span style='color:#111;'> 91.00MB </span>","children":null,"spread":false},{"title":"Debug","children":null,"spread":false},{"title":"ipch","children":[{"title":"test-df78f63f","children":[{"title":"test-2434c52c.ipch <span style='color:#111;'> 89.88MB </span>","children":null,"spread":false},{"title":"test-e10193ea.ipch <span style='color:#111;'> 89.94MB </span>","children":null,"spread":false}],"spread":true}],"spread":true},{"title":"test.sln <span style='color:#111;'> 1.28KB </span>","children":null,"spread":false},{"title":"x64","children":[{"title":"Debug","children":[{"title":"test.ilk <span style='color:#111;'> 1.68MB </span>","children":null,"spread":false},{"title":"test.exe <span style='color:#111;'> 336.50KB </span>","children":null,"spread":false},{"title":"test.pdb <span style='color:#111;'> 7.38MB 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