VC.NET实现图形拉伸显示，为了演示方便，先暂时使用了图形填充来演示，不过载入一张图像文件，效果是一样的，拖动图形四角的黑点，可放大拉伸显示，不过要双击一下标题栏再双击一次，让窗口还原，就可看到效果，演示程序并不是完美的，如果需要图像拖放功能的话，这是个可以参考的源码例子。运行例子中的EXE需要msvcr70.dll和mfc70.dll两个文件。-VC.NET stretch of graphics display, to demonstrate the convenience, temporarily use a graphics fill to demonstrate, but load an image file, the effect is the same, drag the graphic square black spots, zoom stretched display, but To double-click on the title bar and then double again, so restore the window, you can see the effect, demo program is not perfect, if you need an image, then drag and drop functionality, this is a can refer to the source code examples. Required to run the example of msvcr70.dll and mfc70.dll two EXE files.