SetLayeredWindowAttributes function user32

int SetLayeredWindowAttributes(
  1. int hwnd,
  2. int crKey,
  3. int bAlpha,
  4. int dwFlags
)

Sets the opacity and transparency color key of a layered window.

BOOL SetLayeredWindowAttributes(
  HWND     hwnd,
  COLORREF crKey,
  BYTE     bAlpha,
  DWORD    dwFlags
);

Implementation

int SetLayeredWindowAttributes(int hwnd, int crKey, int bAlpha, int dwFlags) =>
    _SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags);