VC++ 分多个线程来同时进行多项任务，在本例中，每个线程完成的任务几乎是一样的，但是互不影响，各自执行各自的，是一个进度条的显示样例。每个独立线程分别发送消息进入各自的进度条控制指令。 -VC++ in several threads to carry out multiple tasks simultaneously, in this case, each thread is almost the same task, but independently of each other, t