Bitmap CreateBitmap, CreateBitmapIndirect, CreateCompatibleBitmap, CreateDIBitmap, CreateDIBSection
(Bitmaps can be selected for memory device contexts only, and for only one device context at a time.)
先创建一个bitmap。用位图工具画一个bitmap。加载到这个创建的位图里面。再把返回的句柄放到SelectObject (句柄)