This figure is I find online, assuming that the figure of the outside circle region is white, and how to set the button on the white to transparent color???????

CodePudding user response:

//circle
CRgn rg.
Rg. CreateEllipticRgn (0, 0, CIRCLE_DIA, CIRCLE_DIA );
PBn [m_iBn] - & gt; SetWindowRgn (rg, TRUE);
DeleteObject (rg);