windows - 如何在 Windows 中获取窗口的默认标题栏高度？

Question

我正在开发一个使用自绘标题栏的应用程序，它需要模仿系统默认的标题栏。

那么在 Windows 中如何获取重叠窗口的默认标题栏高度？

Answer 1

从 Firefox 移植的源代码:

// mCaptionHeight is the default size of the NC area at
// the top of the window. If the window has a caption,
// the size is calculated as the sum of:
//      SM_CYFRAME        - The thickness of the sizing border
//                          around a resizable window
//      SM_CXPADDEDBORDER - The amount of border padding
//                          for captioned windows
//      SM_CYCAPTION      - The height of the caption area
//
// If the window does not have a caption, mCaptionHeight will be equal to
// `GetSystemMetrics(SM_CYFRAME)`
int height = (GetSystemMetrics(SM_CYFRAME) + GetSystemMetrics(SM_CYCAPTION) +
    GetSystemMetrics(SM_CXPADDEDBORDER));
return height;

PS:高度与 dpi 相关。