Introduction - If you have any usage issues, please Google them yourself
① translucent dialog to achieve with the current display device to create a compatible environment to create a bitmap object ② environment with the current display device compatible memory device context ③ Select the bitmap object into the memory device context ④ call BitBlt ( ) function will display the images copied to the environment in the memory device context to ⑤ of the memory device context bitmap-by-point brightness processing ⑥ in the OnPaint () function will be processed by the bitmap BitBlt () function to copy back ⑦ removed the display device selected into the environment to the memory device context bitmap device context object and the object