关于API的问题
自己近来使用API编写了一个类似于Windows绘图程序的一个小程序,但是运行时发现程序在绘图时有时会呈现如附件中图片所示的状况,还有就是本程序的保留功能有问题,每次保留的位图都是全黑的,不认识是什么原因,请哪位高手帮助看看,程序在附件中,如过发现本程序还有其他问题希望可以指出改正,程序改好后可发送到自己邮箱中。非常感谢(I recently used the API to write a small program similar to the Windows drawing program, but when running, I found that the program sometimes displayed the situation shown in the picture in the attachment when drawing, and there was a problem with the reservation function of this program. The reserved bitmaps are all black. I don't know the reason. Please help me. The program is in the attachment. in your own mailbox. thank you very much)
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