To set this qualifier to "True", you must call the service through a synchronous interface.

要将这个修饰符设置为True，您必须通过一个同步接口来调用这个服务。

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Other routers such as the chaining router do not require that you set synchronous to true on the outbound endpoint and always return a response in synchronous scenarios.

其它的路由器，比如chaining路由器并不需将出站端点的synchronous属性设置为true，该路由器总会在同步的场景中返回一个响应。

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If the pointer for an overlapped operation is set to NULL, DeviceIoControl will work in a blocked (synchronous) way.

如果重叠操作的指针设为NULL，那么DeviceIoControl将以阻塞(同步)方式工作。

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