What Uxtheme function I must use to get the default size of the minimize, Maximize and close buttons?

Question

I\'m using the DrawThemeBackground function to draw some system elements on a canvas, And I need draw the title buttons of a form, the only part that i missed is how i can g

Answer 1

I think SystemParametersInfo with SPI_GETNONCLIENTMETRICS is what you're looking for. I guess the minimize and maximize buttons use NONCLIENTMETRICS.iSmCaptionWidth while close uses iCaptionWidth to determine width.