[windows API]获取当前系统图标,文字大小
取DPI 缩放比例
HWND wnd = ::GetDesktopWindow();
dbg_print("desktopwnd:0x%X\n",wnd);
HDC dc = GetDC(wnd);
int desktopVerts = GetDeviceCaps(dc, DESKTOPVERTRES );
dbg_print("DESKTOPVERTRES:%d\n",desktopVerts);
int verts = GetDeviceCaps(dc, VERTRES );
dbg_print("VERTRES:%d\n",verts);
dpiScaling = desktopVerts*100 / verts;
ReleaseDC(dc);
计算缩放参照
void dpiScale(RECT& r)
{
r.left = r.left * dpiScaling / 100;
r.right = r.right * dpiScaling / 100;
r.top = r.top * dpiScaling / 100;
r.bottom = r.bottom * dpiScaling / 100;
}
以上就是获取DPI缩放比例和计算参照,注意:由于是整数计算,比例被先放大了100倍,这里需要换算回去,以避免整数除法带来的较大误差
HWND wnd = ::GetDesktopWindow();
dbg_print("desktopwnd:0x%X\n",wnd);
HDC dc = GetDC(wnd);
int desktopVerts = GetDeviceCaps(dc, DESKTOPVERTRES );
dbg_print("DESKTOPVERTRES:%d\n",desktopVerts);
int verts = GetDeviceCaps(dc, VERTRES );
dbg_print("VERTRES:%d\n",verts);
dpiScaling = desktopVerts*100 / verts;
ReleaseDC(dc);
计算缩放参照
void dpiScale(RECT& r)
{
r.left = r.left * dpiScaling / 100;
r.right = r.right * dpiScaling / 100;
r.top = r.top * dpiScaling / 100;
r.bottom = r.bottom * dpiScaling / 100;
}
以上就是获取DPI缩放比例和计算参照,注意:由于是整数计算,比例被先放大了100倍,这里需要换算回去,以避免整数除法带来的较大误差
后加:
HWND wnd = ::GetDesktopWindow();
HDC dc = ::GetDC(wnd);
double PIXX = GetDeviceCaps(dc, LOGPIXELSX);
double rate = PIXX / 96;
HDC dc = ::GetDC(wnd);
double PIXX = GetDeviceCaps(dc, LOGPIXELSX);
double rate = PIXX / 96;