什么是|运算符在函数调用中的意思？ [C ++]

I usually see this when looking at Win32 gui code. My assumption is that it is a standard bitwise or, but I also occasionaly see it in C#, and it seems like there would be a better (well higher level) way to do the same thing there. Anyway, here's an example:I usually see this when looking at Win32 gui co