实现RichEditCtrl显示各种图片（BMP、GPG、GIF、TIFF、PNG等），使用了GDI+托管功能，借用了显示位图功能，希望能对大家有所帮助-To achieve a variety of picture RichEditCtrl show (BMP, GPG, GIF, TIFF, PNG, etc.), the use of GDI+ Hosting features, to borrow a display bitmap features, hoping to help all