One instance of MFC Programme

One instance of MFC Programme

让程序只运行一个实例的方法有数种，但原理都是相同的，就是在程序的主窗口创建之前，检查系统中是否已经存在某个与本程序相关的特定标志了。如果存在，则说明已经有一个实例在运行了，当前程序不用创建主窗口，直接

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