directshow开发能预览usb摄像头、拍照、暂时还不能录音，完成后再上传-directshow development can preview usb camera, taking pictures, recording is not yet complete and then upload

这是易语言写的打印预览2.44(注册表配置)模块源码，分享给大家学习-This is easy language to write the print preview 2.44 (registry configuration) module source code, to share with everybody to learn