我可以使用如下代码输出单通道模拟信号：（I can generate an analog signal with codes below）
DAQmxErrChk(DAQmxCreateTask("2", &AO1));
DAQmxErrChk(DAQmxCreateAOVoltageChan(AO1, "Dev1/ao0", "", -10, 10, DAQmx_Val_Volts, NULL));
DAQmxErrChk(DAQmxCfgSampClkTiming(AO1, "/Dev1/PFI0", int(num), DAQmx_Val_Rising, DAQmx_Val_ContSamps, int(num)));
DAQmxErrChk(DAQmxWriteAnalogF64(AO1, int(num), 0, 10.0, DAQmx_Val_GroupByChannel, data1, NULL, NULL));
但是当我改用2个通道的时候，程序和报错如下：(But an error comes out when I add another channel with these codes)
DAQmxErrChk(DAQmxCreateTask("2", &AO1));
DAQmxErrChk(DAQmxCreateAOVoltageChan(AO1, "Dev1/ao0", "", -10, 10, DAQmx_Val_Volts, NULL));
DAQmxErrChk(DAQmxCfgSampClkTiming(AO1, "/Dev1/PFI0", int(num), DAQmx_Val_Rising, DAQmx_Val_ContSamps, int(num)));
DAQmxErrChk(DAQmxWriteAnalogF64(AO1, int(num), 0, 10.0, DAQmx_Val_GroupByChannel, data1, NULL, NULL));
DAQmxErrChk(DAQmxCreateTask("3", &AO2));
DAQmxErrChk(DAQmxCreateAOVoltageChan(AO2, "Dev1/ao1", "", -10, 10, DAQmx_Val_Volts, NULL));
DAQmxErrChk(DAQmxCfgSampClkTiming(AO2, "/Dev1/PFI0", int(num), DAQmx_Val_Rising, DAQmx_Val_ContSamps, int(num)));
DAQmxErrChk(DAQmxWriteAnalogF64(AO2, int(num), 0, 10.0, DAQmx_Val_GroupByChannel, data2, NULL, NULL));
DAQmx Error: The specified resource is reserved.
我该如何修改？(What should I do?)
