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DLP4500: 怎么确定投影仪开始投影的同时相机的c++代码开始运行

Part Number: DLP4500
Other Parts Discussed in Thread: DLPC3478

投影仪通过trig1 链接相机,投影仪投图同时触发相机,相机采集图像并传回电脑,相机的代码里需要添加dlp4500的api或sdk代码吗,怎么确定投影仪开始投影的同时相机的c++代码开始运行